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Smoke Shaft Air Testing
Smoke Shaft Air Testing: Why It Matters

Smoke Shaft Air Testing: Why It Matters

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Smoke Shaft Air Testing: Why It Matters and How to Avoid a Failed Test

Smoke shafts are commonly installed in high-rise buildings as part of a fire-engineered smoke control strategy. They play an important role in helping to remove smoke from a building during a fire, allowing escape routes to remain as clear as possible.

Because the smoke shaft is such an important part of the overall smoke control system, air tightness is critical. A smoke shaft that is too leaky may not perform as intended, which is why air tightness testing is required before the system can be signed off.

What happens if a smoke shaft fails its air test?

The usual air tightness target for a smoke shaft is 3.8 m³/hr/m². If the shaft exceeds this limit, the leakage can affect the performance of the smoke control system.

A failed test can also cause delays to a project, as the smoke control system may not be able to receive final approval from the fire system contractor and/or Building Control until the issue has been resolved.

Fortunately, a failed test doesn’t necessarily mean extensive remedial work is required. The key is finding where the air is escaping.

Finding and fixing smoke shaft leaks

We have extensive experience testing smoke shafts of all sizes, from individual shafts through to large-scale developments.

When a smoke shaft fails its initial air test, we can provide a diagnostic leakage investigation to identify the cause of the failure. We use a combination of smoke testing and thermal imaging to locate air leakage paths within the smoke shaft envelope.

This approach allows us to pinpoint areas that require attention rather than relying on trial-and-error sealing.

Once the investigation is complete, we collate our findings into a detailed air leakage report. This gives the client a clear indication of where remedial sealing work is required, allowing contractors to focus their efforts on the areas that matter.

On previous projects, this targeted approach has enabled remedial works to be completed quickly, with the smoke shaft subsequently passing its air tightness test on the next visit.

Our smoke shaft testing service

Our smoke shaft air testing service includes:

  • Smoke shaft survey visits carried out by experienced consultants
  • UKAS and ATTMA Level 2 accredited air testing
  • Smoke shaft air test certification
  • High-powered fan equipment suitable for a range of shaft sizes
  • UKAS-calibrated testing equipment
  • Detailed leakage diagnostics using smoke machines and thermal imaging
  • Rapid testing and reporting

Experienced smoke shaft air testing specialists

Air Pressure Testing is one of the few companies in the UK to hold both UKAS and ATTMA Level 2 accreditation for air tightness testing of buildings, as well as smoke shafts and floor plenums.

Whether you’re arranging a smoke shaft test for a new development or need help diagnosing a failed test, our team can provide both the testing and diagnostic support needed to identify problems and help get the shaft ready for a successful retest.

For more information about our smoke shaft (AOV) air testing services, or to request our smoke shaft checklist, please contact us through our website:

Air Pressure Testing – Smoke Shaft Air Testing

Noise and Acoustic Consultancy
Noise and Acoustic Consultancy in London

Noise and Acoustic Consultancy in London

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Professional Noise and Acoustic Consultancy in London

Noise can have a significant impact on the way a building is designed, used and enjoyed. Whether you are planning a new residential development, dealing with a noise complaint, installing new plant or equipment, or simply trying to improve the sound insulation of an existing building, getting the right acoustic advice early can save considerable time, expense and disruption later on.

APT Sound Testing is an experienced professional noise and acoustic consultancy serving Greater London, the Home Counties and clients throughout the UK. Our qualified and experienced acoustic consultants provide practical advice and detailed assessments covering a wide range of noise and acoustic issues.

From BS 4142 noise assessments and London noise surveys to acoustic design and sound insulation testing, we help homeowners, developers, architects, contractors and businesses understand their acoustic requirements and find effective solutions.

London Noise Surveys and Acoustic Assessments

We carry out noise surveys for a wide variety of sites, including proposed residential developments and other noise-sensitive buildings. This can include locations affected by road traffic, railways, aircraft, commercial premises or industrial activity.

Our approach is straightforward: we establish the existing noise environment, assess how it could affect the proposed development and recommend suitable measures to control or reduce unwanted noise.

Depending on the project, our work can include:

  • Noise surveys and noise assessments
  • BS 4142 assessments
  • Acoustic assessments for planning applications
  • Noise impact assessments
  • Environmental noise monitoring
  • Noise mitigation proposals
  • Assessment of noise from plant and equipment
  • Acoustic design advice
  • Sound insulation testing
  • Advice on meeting Building Regulations Part E

Where new mechanical plant, ventilation equipment or other noise-generating equipment is proposed, we can also establish appropriate noise emission limits and advise on mitigation measures to help meet Local Authority requirements.

Local Knowledge Matters

Acoustic requirements can vary considerably between developments, particularly when planning policies and local environmental conditions are taken into account.

As a company working extensively across Greater London and the surrounding areas, APT Sound Testing has considerable experience of the requirements associated with London planning applications and noise-sensitive developments.

Our consultants have worked on projects involving residential, commercial and industrial properties, giving us a practical understanding of how noise can affect both developments and the surrounding community.

By considering potential acoustic issues at an early stage, problems can often be identified and resolved before they become expensive construction or planning issues.

Noise Surveys for New Developments in London

A noise survey may be required as part of the planning process for a new development, particularly where a site is close to busy roads, railway lines, airports, commercial premises or other significant noise sources.

In some cases, the Local Authority may request a noise assessment during pre-application discussions. A planning condition may also require a survey or acoustic report before construction can begin or before a development can be occupied.

Ideally, the noise survey should be carried out during the design stage. Understanding the existing noise levels at the site allows the acoustic performance of the proposed building to be considered from the outset.

For example, if external noise levels are relatively high, the building envelope may require enhanced acoustic performance. This could involve specifying suitable glazing, ventilation systems, wall constructions or other measures to ensure acceptable internal noise levels.

Depending on the planning requirements, further testing or assessment may also be required after construction to demonstrate that the required internal noise criteria have been achieved.

What Does a Noise Survey Report Include?

The exact contents of a noise survey will depend on the nature of the project and the requirements of the Local Authority. However, a comprehensive report will typically include:

  1. The purpose and scope of the assessment
  2. A location plan showing the proposed development and relevant noise-sensitive receptors, such as nearby residential windows
  3. Survey methodology, including monitoring locations, equipment used and weather conditions
  4. Details of any deviations from recognised standard methodologies and the reasons for them
  5. A full set of survey results
  6. Comparison of measured noise levels against the relevant standards and criteria
  7. Recommendations for noise mitigation, such as acoustic barriers or improved building elements
  8. Supporting calculations demonstrating the expected reduction in noise from the proposed mitigation measures

A good acoustic report should not simply present measurements. It should explain what those measurements mean for the proposed development and provide practical recommendations that can be incorporated into the design.

Noise Exposure Categories (NECs)

Noise Exposure Categories, or NECs, are used to help assess the impact of environmental noise on a proposed development.

The category applicable to a site helps determine how seriously noise needs to be considered as part of the planning process. Noise levels are normally established through appropriate monitoring, after which potential mitigation measures can be assessed.

Depending on the site, mitigation could include acoustic barriers, enhanced glazing, improved ventilation arrangements, changes to the building layout or other acoustic design measures.

Where possible, addressing these issues during the design stage is preferable to attempting to resolve them after construction has started.

A detailed and accurate acoustic assessment can therefore play an important role in preventing noise-related planning problems and ensuring that appropriate mitigation is incorporated into the development from the beginning.

Acoustic Design and Building Regulations Part E

Noise consultancy is not limited to external environmental noise. We also provide advice on the sound insulation performance of walls, floors and other building elements.

For residential developments, meeting the requirements of Approved Document E of the Building Regulations is an important part of the construction process.

Our acoustic consultants can provide advice on soundproofing design and help identify suitable construction details to achieve the required level of acoustic performance.

Our services include:

  • Noise surveys to support planning applications
  • Acoustic design services to help projects meet Building Regulations Part E
  • Sample sound testing to assess the acoustic performance of existing construction
  • Acoustic site inspections to identify potential construction issues
  • Visual inspections to check that acoustic details are being installed correctly
  • Pre-completion sound testing in accordance with Building Regulations Part E

By combining acoustic consultancy, site inspections and sound testing, we can provide a more complete picture of a building’s acoustic performance.

Pre-Completion Sound Testing in London

Pre-completion sound testing (PCT) is used to demonstrate compliance with the sound insulation requirements of Approved Document E of the Building Regulations.

Testing is generally carried out once the relevant walls, floors and other separating elements have been completed, but before the building is handed over or occupied.

The tests assess the acoustic performance of the completed construction and can identify whether the required standards have been achieved.

Carrying out testing at the appropriate stage of construction is important. If problems are discovered after a building has been completed and occupied, remedial acoustic work can be significantly more disruptive and expensive.

For developers and contractors, arranging sound testing as part of the construction programme helps ensure that any issues can be identified at the right time.

Acoustic Site Visits and Sample Sound Testing

Sometimes the best way to understand an acoustic problem is to inspect the building itself.

APT Sound Testing can undertake acoustic site visits to examine existing construction and identify areas that could affect sound insulation performance.

During a site visit, we can look for issues such as unsuitable construction materials, gaps or weaknesses in acoustic details, or installation problems that could compromise the intended performance of a wall or floor.

We can also carry out sample sound testing of existing construction. This provides useful information about the actual acoustic performance of existing partitions and separating elements.

Having this information allows us to develop more targeted acoustic improvements rather than relying solely on assumptions about how a particular construction should perform.

BS 8233 Noise Surveys in London

Noise assessments are frequently required during the planning process for developments that either generate noise or are particularly sensitive to noise.

This can include residential developments, schools, hotels, healthcare buildings and mixed-use schemes. In some cases, a development may both generate noise and be affected by noise from surrounding sources.

A noise assessment will generally establish the existing acoustic environment and consider how the proposed development could change it.

For developments that could generate significant noise, a Noise Impact Assessment may be required. This can involve measuring existing background and ambient noise levels and predicting the likely impact of the proposed development.

Larger projects may also need to consider secondary effects. For example, a development that increases traffic could potentially affect noise levels on surrounding roads.

Assessing Internal Noise Levels

For noise-sensitive developments, it is often important to understand how much external noise will be experienced inside the completed building.

Our consultants can use noise prediction and acoustic calculation methods to assess expected internal noise levels and determine whether additional measures are required.

The overall acoustic performance of a building envelope can depend heavily on the glazing, ventilation and construction systems used.

Where external noise levels are high, it may be necessary to specify particular glazing or ventilation systems to ensure that suitable internal noise criteria can be achieved without compromising ventilation or occupant comfort.

Considering these requirements during the design stage makes it much easier to incorporate appropriate acoustic measures into the building.

Practical Acoustic Advice from Experienced Consultants

Whether you are a property developer, architect, contractor, business owner or private individual, acoustic issues can sometimes appear complicated.

Our role is to make the process as straightforward as possible.

A typical noise assessment is not necessarily intrusive or time-consuming. Depending on the requirements of the project, we may install a noise meter at the site for a period such as 24 hours so that sufficient data can be collected.

The equipment can automatically record the relevant noise information while taking account of the site’s surroundings and external conditions.

Once the survey has been completed, our consultants can analyse the results, prepare a detailed report and explain what they mean for your project.

Most importantly, we can provide practical recommendations on what needs to happen next.

Contact APT Sound Testing

APT Sound Testing provides professional noise surveys, acoustic assessments, sound testing and acoustic consultancy services throughout Greater London, the Home Counties and across the UK.

Whether you need an acoustic assessment for a planning application, advice on noise mitigation, BS 4142 or BS 8233 assessment, acoustic design advice or pre-completion sound testing, our experienced consultants can help.

Getting professional acoustic advice at an early stage can help prevent planning delays, construction problems and unnecessary costs later in the project.

Speak to the APT Sound Testing team today on 01525 303905 or email info@aptsoundtesting.co.uk to discuss your requirements.

Thermal Imaging Surveys
Reasons for Undertaking a Thermal Imaging Survey

Reasons for Undertaking a Thermal Imaging Survey

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10 Reasons for Undertaking a Thermal Imaging Survey

The are hundreds of reasons why you should undertake thermal imaging to electrical systems within your building; however, here is the top 10 reasons:

  1. Safety of electrical systems: Thermal imaging can identify overheating components, loose connections, and other issues that may lead to equipment failure or fire hazards resulting in injury or even loss of life!
  2. Preventive Maintenance: It helps avoid reactive repair and replacement costs. By being proactive, you can help reduce operating costs.
  3. Energy Efficiency: A single critical fault can mean additional energy costs.  Thermal imaging can help identify such electrical faults, so repairs can be made to reduce running costs. 
  4. Cost Savings: On average, each infrared electrical inspection reveals five to eight faults, highlighting the relative affordability of this predictive service. Its also one of the quickest inspections so defects can be quickly identified.
  5. Fire Safety Compliance: NFPA 70B prescribes annual infrared inspections for electrical systems. A comprehensive infrared inspection can discover hidden defects, prevent unplanned failures, business interruption, equipment damage, and insurance losses.
  6. Insurance Premium Reductions: In some cases, your business might qualify for a reduction in insurance premiums by conducting annual predictive/preventive maintenance thermographic surveys. 
  7. Non-Intrusive: Electrical thermal imaging surveys are non-intrusive, enabling inspections to be completed safely and efficiently, without interruption to your business operations and/or critical assets.
  8. Planning Maintenance: Electrical thermography inspections enable the identification of only those items of equipment that require remedial works together with the severity of the defect. This enables maintenance to be suitably planned around operational commitments. 
  9. Extend Equipment Lifecycle: An electrical thermographic survey can give an excellent insight into the operational effectiveness of equipment, enabling the identification of opportunities to make energy savings together with increasing the operational lifecycle of equipment.
  10. Reduction in Breakdown Costs: Depending on the type of equipment and its location, the cost of electrical failure can run into many thousands of pounds in repairs, lost production, injury claims, etc. As defects are found before they cause equipment to fail, the associated cost of repairs is minimal compared to the cost of equipment failure and/or accidents in the workplace. 

How often should an Infrared Electrical Inspection be undertaken?

Ideally an electrical thermal imaging inspection should ideally be conducted every 6 to 12 months as part of the electrical preventive maintenance program. However, the frequency can vary depending on the equipment history, problems associated with its location, or adverse environmental concerns. For businesses with heavy usage equipment, such as busy manufacturing plants, it’s recommended to carry out a thermal imaging survey every 12 months. Regular inspections can help ensure safety, energy efficiency, and cost savings on critical assets.

Our thermal imaging inspection service for electrical systems

Our team of Level 3 certified professional Thermographers are highly experienced in carrying out thermal imaging surveys and have many years’ experience in all aspects of engineering, construction, maintenance, management, and professional survey work. Our thermal imaging equipment is some of the most accurate on the market, ensuring we pick up faults that other equipment may miss.

Our thermal imaging service includes:

  • Supply of an ITC trained thermographer and level 3 reporting assessment using a large format FLIR P6n-Series (640×480 resolution) thermal imaging camera.
  • To supply an external thermographic inspection of the electrical systems, taking into account, distribution boards, fuse boards, Switchgears, switchboards, Control panels, Busbar systems and Transformers.
  • Looking for loose connections, overloaded and/or fatigued components, uneven voltage distribution and blockages in cooling tubes of transformers
  • A detailed report clearly showing any areas of concern

For more information on our thermal imaging service for electrical systems in London, please contact us at: info@aptsoundtesting.co.uk or call APT Sound Testing on 07775 623464.

Thermal Imaging Surveys
Guide to Thermal Imaging Surveys

Guide to Thermal Imaging Surveys

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Thermal Imaging Surveys: Identifying Building Defects

When it comes to maintaining the health, performance and energy efficiency of a building, thermal imaging surveys are an invaluable diagnostic tool. Using advanced infrared technology, thermal cameras can detect temperature variations that are invisible to the naked eye, helping to uncover hidden problems before they become costly repairs.

From identifying heat loss and insulation issues to detecting water leaks, dampness, air infiltration and potential structural defects, thermal imaging provides a fast, non-invasive way to assess a building’s condition.

At APT Sound Testing, we have over 15 years of experience carrying out professional building thermographic surveys throughout England and Wales. Our detailed thermal imaging reports provide the information required by construction and insurance companies, facility managers, Building Control and BREEAM assessors, making them suitable for a wide range of industrial, commercial and residential applications.

What Is a Thermal Imaging Survey?

Thermal imaging, also known as thermography, is a technique used to detect infrared radiation emitted by objects and surfaces.

Although infrared radiation cannot be seen by the human eye, specialist thermal cameras can detect it and convert temperature variations into a visual image. Different temperatures are represented by different colours, allowing trained thermographers to identify unusual thermal patterns and potential defects.

These thermal anomalies can provide valuable evidence of issues such as:

  • Excessive heat loss caused by damaged, missing or inadequate insulation
  • Moisture ingress caused by water leaks or damp
  • Overheating electrical components and potential electrical faults
  • Thermal bridging around windows, doors and other areas of the building envelope
  • Air leakage and infiltration through gaps and poorly sealed areas
  • Potential structural defects associated with changes in thermal performance

Because thermal imaging is non-destructive, surveys can often be completed without opening up walls, ceilings or floors, making them a cost-effective first step when investigating suspected building defects.

Thermal Imaging Surveys for Commercial Buildings

A thermal imaging survey can provide valuable information about the thermal performance of a commercial building, often at minimal cost compared with more invasive investigation methods.

At APT Sound Testing, we are a first port of call for many surveyors and building professionals requiring a professional thermal imaging defects survey.

An infrared survey can identify much more than simple heat loss. It can be used to investigate:

Building Energy Efficiency

A thermal imaging survey can highlight areas where heat is escaping from a building. Identifying the areas with the greatest heat loss can help property owners prioritise improvements and potentially reduce energy consumption and operating costs.

Damp Walls, Ceilings and Floors

Thermal imaging can help identify temperature patterns associated with water ingress and dampness, including suspected leaks from flat roofs, roof lights and other areas of the building envelope.

Water Leaks

Infrared surveys can assist in locating suspected leaks within building water systems, particularly where pipework or other services are concealed and difficult to access.

Thermal Bridging

Thermal bridges can occur where insulation is missing, ineffective or interrupted. Common problem areas include door and window reveals, heads and other junctions within the building envelope.

Missing or Damaged Insulation

Poor workmanship, deterioration or damage can result in missing or ineffective insulation. Thermal imaging can reveal the resulting cold spots within walls, floors and roofs, helping identify areas that may require further investigation.

Air Infiltration

Cold draughts entering through gaps in the building envelope can affect occupant comfort and increase energy consumption. Thermal imaging can help identify areas where unwanted air infiltration may be occurring.

Excessive Air Leakage

Warm air escaping through the building envelope can waste energy and make it more difficult to maintain comfortable internal temperatures. During warmer months, unwanted heat gain can also contribute to increased cooling requirements.

Thermal Imaging House Surveys for Reducing Heat Loss

Thermal imaging isn’t just for commercial properties. Residential thermal imaging surveys can provide homeowners, landlords, surveyors and property professionals with valuable information about the thermal performance of a property.

A thermal camera survey can investigate a range of potential problems, including:

  • Energy efficiency and heat loss – identifying areas where energy-saving improvements could have the greatest impact.
  • Damp walls, ceilings and floors – helping investigate potential water ingress, dampness and suspected leaks from roofs or around chimneys.
  • Water leaks – identifying thermal patterns associated with leaks from underfloor heating systems and concealed pipework.
  • Thermal bridging – detecting areas of missing or ineffective insulation around windows, doors and other junctions.
  • Missing or damaged insulation – identifying cold spots that may indicate poor installation, deterioration or missing insulation.
  • Air infiltration – highlighting areas where cold air may be entering through the building envelope.
  • Air leakage paths – identifying areas where warm air is escaping, potentially wasting energy and affecting indoor comfort.

By highlighting these problem areas, a thermal imaging survey can help property owners make better-informed decisions about insulation, repairs and energy-efficiency improvements.

BREEAM Thermal Imaging Surveys

Thermal imaging has become an important part of BREEAM assessments, the internationally recognised environmental assessment and rating system for buildings.

BREEAM sets standards for sustainable building design, construction and operation. Both BREEAM New Construction and BREEAM Domestic Refurbishment recognise the importance of thermal imaging in assessing insulation continuity, with credits available where surveys are carried out in accordance with the relevant requirements by an appropriately qualified thermographer.

At APT Sound Testing, we have been providing professional BREEAM thermal imaging surveys for over a decade, helping clients demonstrate insulation continuity and identify potential defects within the building envelope.

Our infrared inspections are carried out by Level 3 certified thermographers using high-resolution FLIR thermal imaging cameras. This combination of specialist expertise and advanced equipment enables us to provide accurate, detailed and reliable thermal imaging reports for every project.

Why Choose APT Sound Testing?

A professional thermal imaging survey can provide valuable insight into problems that may otherwise remain hidden. Whether you’re investigating heat loss in a home, checking insulation continuity on a new-build development, assessing a commercial property or supporting a BREEAM assessment, thermography can be a highly effective diagnostic tool.

With over 15 years of experience, extensive knowledge of building performance and Level 3 certified thermographers, APT Sound Testing provides professional thermal imaging surveys throughout England and Wales.

Our detailed reports are designed to provide clear, useful information for surveyors, construction companies, insurers, facility managers, Building Control and BREEAM assessors.

If you suspect your property has hidden heat loss, insulation problems, damp, water ingress or air leakage, a thermal imaging survey could help identify the issue quickly and without invasive investigation.

BREEAM Indoor Air Quality Testing
BREEAM Indoor Air Quality

BREEAM Indoor Air Quality

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BREEAM Indoor Air Quality Testing: Why It Matters

When we think about what makes a building great, energy bills and acoustics usually come to mind first. But there’s something just as important hiding in plain sight: the air your occupants are breathing every single day. That’s exactly why BREEAM puts indoor air quality front and centre — because a healthy building starts with healthy air.

At APT Sound Testing, we’ve been carrying out BREEAM Indoor Air Quality (IAQ) testing for years. We’ve helped developers, contractors, architects, and project managers earn valuable BREEAM credits while making sure their buildings meet the highest standards of indoor environmental quality.

Whether you need an Indoor Air Quality Plan, post-construction testing, or just a bit of expert guidance along the way, our team is here to make the whole process as straightforward as possible — from the very first conversation to the final report.

So, What Actually Is BREEAM Indoor Air Quality Testing?

Put simply, it’s a way of checking the air inside a newly finished building before anyone moves in. The goal is refreshingly simple: keep harmful pollutants out and create a healthier environment for the people who’ll actually live and work there.

As part of the assessment, we test for the key airborne culprits, including:

  • Total Volatile Organic Compounds (TVOCs)
  • Formaldehyde

And if your project needs it, we can test for additional pollutants too, depending on your specific requirements.

The Two Stages of BREEAM Hea02

To unlock the BREEAM credits available under the Hea02 category, there are two stages to get through.

Stage 1 – The Indoor Air Quality Plan (IAQP)

This is where it all starts, back in the design phase. The Indoor Air Quality Plan is all about spotting problems before they happen — thinking through ventilation strategies, construction methods, building materials, and future maintenance so poor air quality never becomes an issue in the first place.

Our bespoke plans typically include:

  • Advice on identifying and removing contamination sources
  • Recommendations for controlling and diluting airborne pollutants
  • Pre-occupancy flush-out procedures
  • A practical checklist to get you ready for third-party testing
  • Guidance on keeping air quality good long after occupation
  • Independent testing and analysis

Stage 2 – Post-Construction Indoor Air Quality Testing

Once the build is done and the HVAC system is up and running, it’s time for the real test. During our site visit, we collect air samples from representative occupied spaces — think offices, classrooms, healthcare facilities, apartments, or any regularly used room.

Those samples are then analysed against the limits BREEAM sets out. If anything comes back over the threshold, we won’t just hand you a problem — we’ll explain the findings clearly and recommend practical steps to bring the building back into compliance.

Why Work With APT Sound Testing?

We’ve helped clients right across the UK achieve BREEAM, Home Quality Mark (HQM), and other environmental compliance standards through reliable, accurate testing. When you work with APT Sound Testing, here’s what you can expect:

  • Experienced, qualified testing engineers
  • Fixed, competitive quotes with no hidden surprises
  • Helpful pre-test guidance to maximise your chances of success
  • Testing carried out strictly to BREEAM Hea02 requirements
  • Fast, clear reporting and expert technical advice

We know preparation is often the difference between a pass and a repeat visit, which is why we’re always happy to offer practical advice before we even set foot on site.

Getting Ready for Your Test

A successful test starts long before we arrive. Our team provides a comprehensive checklist to make sure your building is genuinely ready — helping you avoid unnecessary delays and repeat visits.

If you’re planning a BREEAM assessment, we’d love to send you our Indoor Air Quality Testing Checklist to help keep your project on track.

Ready to Get Started?

If you’re looking for a trusted partner to carry out your BREEAM Indoor Air Quality Testing, we’d be glad to help. From the Indoor Air Quality Plan through to post-construction testing and reporting, we’ll guide you through every step with friendly advice and professional support.

Give us a call on 01525 303905 or email info@aptsoundtesting.co.uk to chat about your project — or head over to our Contact page to request a quotation.

Thermal Imaging Surveys
Choose APT for Your Thermal Imaging Survey

Choose APT for Your Thermal Imaging Survey

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Why Choose APT for Your Thermal Imaging Survey?

When it comes to finding problems that cannot be seen with the naked eye, thermal imaging can be an incredibly valuable tool. At APT Sound Testing, we provide professional thermal imaging surveys for clients across the UK, helping to identify hidden faults, energy inefficiencies and potential maintenance issues before they become costly problems.

So, why choose APT for your thermal imaging survey?

Experience You Can Rely On

We have extensive experience carrying out infrared inspections across a wide range of sectors, including construction, engineering, building maintenance and property management.

Our thermography engineers are ITC-trained to Level 3 and work in accordance with BS EN 13187, giving our clients confidence that surveys are carried out to recognised professional standards. Our experience also means we understand that every building and project is different, so we tailor our approach to suit the individual requirements of each client.

We continually invest in training and professional development, keeping our team up to date with the latest developments in thermal imaging technology and techniques.

Professional Thermal Imaging Equipment

The quality of the equipment used during a thermal imaging survey can make a significant difference to the results.

At APT, we use high-end thermal imaging equipment, including large-format FLIR T Series cameras with 640 × 480 resolution. These professional cameras offer excellent image quality and sensitivity, helping our surveyors identify temperature variations and potential faults that lower-specification equipment may miss.

While some thermal imaging providers use cameras costing a few thousand pounds, our equipment represents a much greater investment. Our cameras typically range from around £10,000 to £30,000, reflecting the level of technology and accuracy required for professional inspections.

We regularly review our equipment and upgrade our technology where appropriate, ensuring our clients benefit from the latest developments in thermal imaging.

What Does Our Thermal Imaging Service Include?

We aim to provide much more than simply a collection of thermal images. Our surveys are designed to give you useful, practical information that you can act on.

Our premium thermal imaging service includes:

  • An ITC-trained Level 3 thermographer
  • Large-format FLIR T Series thermal imaging cameras with 640 × 480 resolution
  • Comprehensive reporting with introduction, fault and summary pages
  • Elevation inventory and detailed fault documentation
  • Possible root causes and recommendations for remedial action
  • Isotherms where appropriate when equations are used
  • Baseline infrared and digital images for each elevation
  • 100% elevation coverage where specified
  • Application of thermal indexing formulas
  • An environmentally friendly electronic report delivered by email

The result is a detailed report that helps you understand what has been found, why it may have occurred and what steps you may wish to take next.

Finding Problems Without Having to Access Them Directly

One of the biggest advantages of thermal imaging is its ability to detect potential problems without the need for invasive inspections.

Thermal cameras measure differences in surface temperature, allowing trained surveyors to identify patterns that may indicate issues such as:

  • Missing or inadequate insulation
  • Moisture ingress
  • Air leakage
  • Thermal bridging
  • Electrical faults
  • Building defects
  • Heat loss
  • Potential mechanical problems

This can be particularly useful where direct access is difficult, restricted or potentially hazardous.

For example, rather than immediately needing to access a high or confined area, thermal imaging may allow our surveyors to investigate the area from a safer position. This can reduce disruption and, in some circumstances, help minimise the need for working at height.

A Non-Invasive Approach

Thermal imaging surveys can often be carried out with minimal disruption to the people using a building.

Whether we are inspecting a commercial property, school, hospital, industrial facility or residential building, our non-invasive approach allows us to investigate potential problems without immediately resorting to intrusive investigations.

This makes thermal imaging particularly useful as an initial diagnostic tool. It can help identify areas that require further investigation, allowing resources to be focused where they are most needed.

Helping You Improve Energy Efficiency

Thermal imaging isn’t only about finding faults. It can also provide valuable information about how a building is performing.

Identifying areas of heat loss, poor insulation or air leakage can help property owners and managers make more informed decisions about improvements. Addressing these issues can potentially reduce energy consumption, improve comfort and lower running costs.

There is also an environmental benefit. Improving the energy efficiency of a building can reduce unnecessary energy use and help minimise its overall environmental impact.

For many of our clients, this makes thermal imaging a useful part of a wider energy-efficiency and maintenance strategy.

Detailed Reports You Can Actually Use

We believe a thermal imaging survey should provide more than a folder full of colourful images.

Our reports are designed to explain what we have found in a clear and practical way. Where potential faults are identified, we provide supporting documentation, possible causes and recommendations for remedial action where appropriate.

This gives clients a clearer understanding of the issues and helps them decide what to investigate or address next.

Our reports can also provide a useful baseline for future inspections, allowing changes to be monitored over time.

Preventative Maintenance

Thermal imaging can be particularly valuable when used as part of a preventative maintenance programme.

Rather than waiting for a visible defect, equipment failure or serious building problem to occur, regular thermal imaging surveys can help identify unusual temperature patterns at an earlier stage.

This can be especially useful for commercial and industrial properties, where unexpected equipment failure or building defects can lead to significant disruption and expense.

By identifying potential problems early, businesses can investigate and plan maintenance before a minor issue develops into a much larger one.

Clear Communication From Start to Finish

We understand that thermal imaging terminology and reports can sometimes seem complicated if you are not familiar with thermography.

That’s why clear communication is an important part of our service.

Before carrying out a survey, we take the time to understand your requirements and identify the areas that need particular attention. We then assess the site and plan the survey accordingly.

During the inspection, our team works methodically to ensure the relevant areas are covered. Once the survey is complete, we explain our findings and provide a detailed report that is designed to be straightforward and useful.

Experience Across Different Applications

Thermal imaging has applications across a wide range of industries.

We can use it to investigate building insulation and heat loss, assess potential moisture problems, examine electrical systems and assist with the investigation of mechanical or industrial equipment.

Our Level 3 training and ongoing professional development mean we are equipped to deal with a wide variety of inspection requirements.

A Commitment to Quality

At APT, quality isn’t simply about having good equipment. It is about combining the right technology with experience, training and a consistent inspection methodology.

Every survey begins with understanding what the client needs. We consider the building or equipment being inspected, identify potential challenges and plan our inspection accordingly.

This structured approach helps us make the most effective use of the technology and provide meaningful results rather than simply collecting thermal images.

Why Choose APT?

Choosing the right company for a thermal imaging survey is important. The quality of the equipment, the experience of the thermographer and the way the results are interpreted can all affect the usefulness of the final report.

At APT Sound Testing, we combine:

  • Experienced, Level 3-trained thermographers
  • Professional FLIR thermal imaging equipment
  • UK-wide coverage
  • Detailed and practical reporting
  • A structured inspection process
  • Ongoing training and professional development
  • A focus on customer service
  • Recommendations designed to help clients make informed decisions

Our aim is simple: to provide accurate, useful information that helps you understand the condition and performance of your property or equipment.

Thermal Imaging Surveys Across the UK

Whether you are investigating suspected heat loss, looking for hidden building defects, carrying out preventative maintenance or assessing a particular area of concern, a professional thermal imaging survey can provide valuable insight without the need for invasive investigation.

At APT Sound Testing, we combine advanced technology with specialist knowledge to deliver thermal imaging surveys for clients across the UK.

If you would like to discuss your requirements or find out whether thermal imaging could help with your property or project, contact APT Sound Testing on 01525 303905 or email info@aptsoundtesting.co.uk.

Thermal Imaging Surveys
Benefits of Thermal Imaging for Buildings

Benefits of Thermal Imaging for Buildings

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Top 10 Benefits of Thermal Imaging for Buildings

Thermal imaging for buildings is transforming how we approach property maintenance, energy efficiency, and safety. Using highly trained Level 3 thermographers, using the latest thermal imaging cameras provide a non-invasive, real-time way to inspect a building’s envelope and systems. With applications ranging from building energy saving to monitoring damp and water ingress, and even checking electrical installations, such as distribution boards and battery UPS systems, thermal imaging has quickly become an essential tool for BREEAM projects, facility managers and building inspections.

In this article, we’ll explore the top 10 benefits of using thermal imaging for buildings, highlighting how this thermal camera technology can optimise building performance, cut costs, and improve safety in the workplace.

1. Enhanced Energy Efficiency and Savings

One of the most compelling benefits of thermal imaging for buildings is its ability to identify energy loss. Infrared cameras can visualize heat escaping through poorly insulated walls, roofs, windows, and doors. By pinpointing these weaknesses, building owners can direct their investments towards addressing areas that lead to significant heat loss. With a well-insulated building, you not only save on your energy bills but also contribute to reducing your overall carbon footprint. Targeted repairs and upgrades ensure that heating and cooling systems operate at optimal efficiency, leading to impressive energy savings over time. This all helps to improve building energy saving, thermal imaging energy efficiency and highlight energy loss detection.

2. Early Detection of Dampness and Water Ingress

Damp and water ingress are major concerns in buildings, often leading to structural damage, mold growth, and compromised indoor air quality. Thermal imaging’s ability to detect temperature anomalies makes it a powerful tool for identifying moisture hidden behind walls and beneath floors. By spotting these issues early, property managers can avoid costly repairs and extensive damage down the line. Regular thermal scans provide insights into hidden water leaks, ensuring that any moisture accumulation is promptly addressed, preserving the integrity and health of the building throughout the building lifecycle. Annual thermal Imaging surveys help to check for damp and water ingress, moisture detection to help minimise risk to your building. 

3. Proactive Electrical Installations Monitoring

Annual thermal imaging surveys of electrical installations are another critical area where thermal imaging shines. Overheating circuits, energy losses, and hotspots can indicate potential electrical faults that might lead to fires or equipment failures. Regular thermal imaging inspections help facility managers detect these issues before they escalate. By monitoring electrical panels, wiring, and outlets, thermal imaging ensures that all components are functioning within safe temperature ranges, thereby preventing outages and enhancing overall building safety. In a nutshell, thermal imaging can lower risk by checking electrical installations for overheating circuits.

4. Battery UPS Installations Inspections

Battery UPS (Uninterruptible Power Supply) systems are vital for ensuring continuous power during outages and for safeguarding sensitive equipment. However, these systems can develop faults, such as failing batteries or poor thermal management, that compromise their performance. Thermal imaging can detect abnormal heat patterns in battery UPS installations, flagging potential problems before they cause system failure. Regular inspections help maintain system reliability, ensuring a steady power supply to critical systems and reducing the risk of fires etc. and costly downtime. We usually recommend a survey every 6 months for UPS battery installations.

5. Improved Preventative Maintenance Programs

Integrating thermal imaging into routine building inspections elevates the efficiency of preventative maintenance programs. By identifying issues early, such as insulation failures, moisture accumulation, or electrical hotspots, repair work can be scheduled proactively rather than reactively. This foresight not only prevents major breakdowns and emergencies but also extends the lifespan of building components and your critical infrastructure. The technology serves as a predictive maintenance tool, significantly reducing long-term maintenance costs.

6. Enhanced Occupant Comfort and Safety

A well-maintained building is not only efficient but also a safer and more comfortable environment. Thermal imaging helps ensure indoor environmental quality by detecting areas that are too cold or too hot due to insulation or HVAC issues. Thermal imaging surveys can also pick up on air leakage paths that can cause excess draughts so that the FM team can quickly seal them. All of this means improved comfort for employees and residents.  Regular thermal imaging inspections can contribute to better indoor air quality and occupant well-being, improving indoor environmental quality.

7. Cost-Effective Long-Term Savings

Although investing in thermal imaging technology may seem expensive upfront, the long-term savings are substantial. By avoiding costly repairs due to early detection of issues, reducing energy waste e.g. by identifying and sealing air leakage paths can reduce the buildings energy consumption by up to 20%, which can be a massive energy saving for large buildings. It can also extend the lifespan of building systems.  All of this shows that thermal imaging can provide a high return on investment. Whether it’s retrofitting old buildings or maintaining modern facilities, the cost benefits are hard to ignore. Ultimately, the efficiency and preventative measures afforded by this technology result in significant financial savings over the building’s lifetime.

8. Comprehensive Building Inspections and Better Documentation

Traditional building inspections often overlook hidden issues. Thermal imaging provides a detailed and comprehensive view of a building’s structural and system health. The visual data generated by thermal cameras is easily documented and can be archived for future reference. Our trend analysis software makes it easier to spot trends or potential issues before they escalate into costly problems. This documentation is invaluable for compliance purposes, insurance claims, and tracking the progress of maintenance work. Detailed thermal imaging reports enhance transparency, making it easier to communicate findings with stakeholders and ensuring that remedial actions are based on concrete evidence, allowing for targeted remedial works.

9. Sustainable Building Management

The integration of thermal imaging into building management strategies supports broader sustainability goals. By ensuring that buildings operate efficiently, with minimal energy waste, thermal imaging aligns with environmental sustainability initiatives. Responsible energy management reduces the carbon footprint of buildings, helping them meet green building standards and certifications. This not only benefits the environment but also improves the marketability of the property by helping to provide a lower EPC rating, appealing to environmentally conscious buyers and tenants.

10. Rapid Non-Invasive Assessments

One of the standout benefits of thermal imaging for buildings is its non-invasive nature. Unlike other methods that may require large amounts of access scaffold and/or mechanical access, such as scissor lifts etc. it reduces time and potential health and safety issues from working at height. It can also reduce the need for physical alterations, or prolonged downtime as thermal imaging can be performed while the building is in operation. This rapid assessment translates into minimal disruption for occupants, reduced costs and quick turnaround times for maintenance teams. Fast, reliable diagnostics combined with easy deployment make it an attractive solution for both small residential properties and large commercial buildings. In summary, we can undertake a building survey within a few hours, which may take a surveying team days or even weeks due t increased access issues.

Conclusion

Thermal imaging for buildings is revolutionizing maintenance and energy management practices. From building energy saving and monitoring damp and water ingress to checking electrical installations and battery UPS installations, this innovative technology offers an expansive array of benefits. It not only enhances energy efficiency and occupant comfort but also reduces long-term costs and supports sustainable building management. As building owners and facility managers increasingly seek modern solutions to complex maintenance challenges, thermal imaging stands out as a powerful, cost-effective tool that ensures safety, efficiency, and longevity.

Embracing thermal imaging can set a strong foundation for proactive building management. With its ability to uncover hidden issues and provide reliable data, it is a must-have tool in the modern era of building maintenance and sustainability. As you plan your next property inspection or energy efficiency audit, consider the transformative impact of thermal imaging and how it can drive improvements across your entire facility.

Contact us for your thermal imaging survey

All our premium thermal imaging inspections include the following: 

  • Level 3 thermographic certification
  • Level 3 qualified electrical thermographers
  • Large format FLIR cameras with 45-degree lenses
  • A detailed and comprehensive thermal imaging survey using our trend analysis software

If you would like more information on our thermal imaging services, please contact APT Sound Testing on 07775 623464, or email us at info@aptsoundtesting.co.uk. We just require your company name, address and phone number, as well as a set of floor plans and elevation drawings, and we will forward a quote and informative checklist to help you prepare for the thermal imaging survey.

BREEAM Indoor Air Quality Testing
BREEAM Indoor Air Quality Testing

BREEAM Indoor Air Quality Testing

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BREEAM Indoor Air Quality Testing – Everything You Need to Know

Creating a healthy indoor environment is becoming an increasingly important part of modern construction. Whether you’re developing an office, healthcare facility, school or residential building, achieving excellent indoor air quality is essential for both occupant wellbeing and BREEAM compliance.

At APT Sound Testing, we’ve been helping developers, architects, contractors and consultants achieve BREEAM Indoor Air Quality (IAQ) credits for many years. From developing compliant Indoor Air Quality Plans to carrying out post-construction air quality testing, our experienced team provides a complete service to help your project meet the required standards.

Why Indoor Air Quality Matters

Poor indoor air quality can affect the health, comfort and productivity of building occupants. Construction materials, finishes, furnishings and building systems can all release pollutants into the air, particularly during the early stages of occupation.

BREEAM recognises the importance of clean indoor air through the Hea02 Indoor Air Quality assessment, rewarding projects that demonstrate good design, careful material selection and successful post-construction testing.

Our Complete BREEAM Indoor Air Quality Service

We offer everything required to help your project achieve BREEAM Indoor Air Quality credits, including:

  • BREEAM Indoor Air Quality Plans
  • Post-construction Indoor Air Quality Testing
  • Air quality monitoring
  • Third-party laboratory analysis
  • Advice on improving indoor air quality
  • Guidance throughout the compliance process

Our team works closely with project managers and contractors to make the testing process as straightforward as possible.

Stage 1 – BREEAM Indoor Air Quality Plan

The first step towards achieving additional BREEAM credits is preparing a compliant Indoor Air Quality Plan (IAQP).

This document is produced during the design stage and helps minimise the risk of poor indoor air quality once the building is occupied. It considers factors such as ventilation design, material selection and construction practices that may affect air quality throughout the project.

A professionally prepared Indoor Air Quality Plan can include:

  • Recommendations for removing contamination sources
  • Methods for controlling and diluting airborne pollutants
  • Pre-occupancy flush-out procedures
  • Practical guidance for contractors during construction
  • Preparation checklists for final air quality testing
  • Long-term advice for maintaining healthy indoor environments

By planning ahead, many potential air quality issues can be avoided before the building is completed.

Stage 2 – Post-Construction Indoor Air Quality Testing

Once construction is complete and the building’s HVAC system is fully operational, post-construction Indoor Air Quality Testing can take place.

The purpose of the testing is to confirm that pollutant levels meet the limits specified by BREEAM.

Testing typically includes measuring:

  • Total Volatile Organic Compounds (TVOCs)
  • Formaldehyde

Additional contaminants can also be tested where required by the project specification.

If any readings exceed the acceptable limits, remedial actions can be implemented in line with the Indoor Air Quality Plan before retesting is carried out.

Professional Indoor Air Quality Testing

APT Sound Testing has extensive experience carrying out post-construction Indoor Air Quality Testing for projects across the UK.

Our engineers follow the strict procedures required under:

  • BREEAM Hea02
  • Home Quality Mark (HQM)
  • Other recognised compliance standards

Before attending site, we provide a clear quotation along with a comprehensive preparation checklist to ensure your building is ready for testing.

As testing requirements can vary between schemes, we always ensure the appropriate methodology is used for your specific project.

Which Areas Are Tested?

Indoor Air Quality Testing is normally carried out in rooms that will be occupied for extended periods.

These commonly include:

  • Offices
  • Hospitals
  • Healthcare facilities
  • Schools
  • Residential accommodation
  • Commercial buildings

The number of rooms tested will depend on the size and layout of the development, ensuring compliance with the relevant BREEAM guidance.

Expert Guidance Throughout Your Project

Preparing a building correctly before testing can make a significant difference to the final results.

Our experienced consultants provide practical advice to project managers and site teams before the testing date, helping create the correct environmental conditions and reducing the likelihood of delays or failed tests.

Having supported hundreds of projects, we understand the common issues that arise and can help you avoid them.

Contact APT Sound Testing

If you require BREEAM Indoor Air Quality Testing or need assistance preparing an Indoor Air Quality Plan, our experienced team is here to help.

Call us today on 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project and request a quotation.

Air Tightness Testing
Commercial Air Tightness Testing

Commercial Air Tightness Testing

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Commercial Air Tightness Testing Requirements: A Complete Guide

Commercial air tightness testing is a legal requirement for most new commercial buildings across the UK. It plays a vital role in demonstrating compliance with Approved Document L (Part L) of the Building Regulations, helping to ensure that buildings achieve modern standards for energy efficiency, carbon reduction, and overall operational performance.

Whether you’re developing a warehouse, office building, retail unit, school, healthcare facility, industrial unit, or another commercial property, you’ll usually need to prove that your building meets specified air permeability targets before Building Control will issue final approval.

This guide explains everything you need to know about commercial air tightness testing, including when testing is mandatory, what Part L requires, how to prepare successfully, and why achieving a good result benefits your business long after construction has finished.

What Is Commercial Air Tightness Testing?

Commercial air tightness testing, also known as air permeability testing or air pressure testing, measures the amount of uncontrolled air leakage through the external envelope of a building. Using specialist blower door equipment, engineers pressurise and depressurise the building to identify how much air escapes through unintended gaps and openings.

Every commercial building will experience some degree of air leakage. However, excessive leakage significantly reduces energy efficiency by allowing heated or cooled air to escape while permitting external air to enter the building. This forces heating, ventilation and air conditioning (HVAC) systems to work harder, increasing operational costs and reducing occupant comfort.

Poor air tightness can result in:

  • Higher heating and cooling costs
  • Increased carbon emissions
  • Difficulty complying with Part L Building Regulations
  • Poor energy performance and EPC ratings
  • Draughts and uncomfortable internal environments
  • Reduced overall building performance

Many leakage paths are hidden behind finishes or located at complex construction junctions. Common examples include poorly sealed service penetrations, cladding interfaces, structural steel connections, door thresholds and roof junctions. Identifying and addressing these issues early can significantly improve a building’s overall performance and reduce the likelihood of failing the final compliance test.

When Is Commercial Air Tightness Testing Mandatory?

Under Approved Document L2, air tightness testing is mandatory for most newly constructed commercial buildings.

Testing is generally required for:

  • All new commercial buildings with a floor area greater than 500 m²
  • Large commercial extensions
  • Major refurbishments where substantial alterations have been made to the building envelope
  • Buildings where Building Control specifically requests verification of air permeability

Even commercial buildings below 500 m² may still require testing if it forms part of the approved energy assessment or Building Control considers it necessary.

The air tightness certificate produced after testing forms an essential part of the Building Regulations compliance package. Without satisfactory results, final sign-off may be delayed until remedial work has been completed and the building successfully retested.

For developers, contractors and project managers, this makes early planning essential. Leaving air tightness until the end of a project often leads to unnecessary delays, additional costs and programme disruption.

Understanding Part L Air Tightness Requirements

Approved Document L establishes the minimum energy efficiency standards for commercial buildings in England. Air tightness forms one of the key performance criteria used to demonstrate compliance.

1. Target Emission Rate (TER)

The building must achieve a calculated carbon emission rate that does not exceed the Target Emission Rate (TER). Excessive air leakage increases heating demand and can make it difficult to satisfy this requirement.

2. Air Permeability Target

Most commercial developments are designed to achieve an air permeability of 10 m³/h·m² at 50 Pascals (Pa) or better.

However, many projects specify significantly lower targets to improve energy efficiency or satisfy sustainability objectives such as BREEAM certification. Modern office buildings, schools and public sector developments frequently require much tighter envelopes than the minimum regulatory standard.

3. Demonstrating Compliance

Once testing has been completed, a formal air tightness test certificate must be submitted to Building Control as evidence that the completed building meets its design specification.

If the measured air permeability exceeds the design target, remedial sealing works will normally be required before the building can be retested.

4. Competent Testing

Testing should only be undertaken by suitably qualified and accredited organisations using calibrated equipment and recognised industry procedures. Selecting an experienced testing provider helps ensure accurate results while providing valuable guidance should remedial works become necessary.

Why Commercial Buildings Fail Air Tightness Tests

Many commercial buildings fail not because of one major defect, but due to hundreds of small leakage paths spread throughout the building envelope.

Some of the most common areas where air leakage occurs include:

  • Roller shutter doors
  • Loading bay doors
  • Service penetrations for ducts, pipes and electrical cables
  • Curtain walling interfaces
  • Cladding joints
  • Structural steel connections
  • Roof-to-wall junctions
  • Lift shafts
  • Mechanical risers
  • Door thresholds
  • Expansion joints
  • Ceiling void penetrations

On large commercial projects, coordination between multiple trades is often the biggest challenge. Electrical contractors, mechanical installers, cladding specialists and drylining contractors all create penetrations through the building envelope, and unless these are correctly sealed, they become significant sources of unwanted air leakage.

Early quality inspections during construction can dramatically reduce the likelihood of discovering problems during the final test.

Preparing for a Successful Air Tightness Test

Good preparation is one of the most effective ways to achieve a first-time pass and avoid costly delays.

Before the test takes place, contractors should ensure that:

  • All external doors and windows are fully installed and operational.
  • Service penetrations are permanently sealed.
  • Internal finishes affecting the building envelope are complete.
  • Trickle vents are closed where appropriate.
  • Mechanical ventilation systems are switched off or temporarily sealed in accordance with testing procedures.
  • Roof hatches, access panels and external openings are properly secured.
  • Temporary construction openings have been permanently closed.

For larger or more complex developments, arranging a pre-test inspection can identify potential issues before formal compliance testing begins. This proactive approach often saves significant time and money by highlighting leakage areas while they remain easy to access.

Where buildings fail initial testing, diagnostic techniques such as smoke tracing and thermal imaging can quickly pinpoint leakage paths, allowing contractors to target remedial works rather than relying on trial and error.

The Benefits of Good Air Tightness

Although air tightness testing is a regulatory requirement, the benefits extend far beyond simply obtaining Building Control approval.

A well-sealed commercial building offers significant long-term advantages, including:

Reduced Energy Costs

Heating and cooling systems operate far more efficiently when conditioned air remains inside the building. Lower energy consumption translates directly into reduced operating costs throughout the building’s life.

Improved Occupant Comfort

Reduced draughts create more consistent internal temperatures, improving comfort for employees, customers and building users.

Better EPC Ratings

Improved air tightness contributes to stronger energy performance calculations, helping buildings achieve higher EPC ratings and supporting sustainability objectives.

Lower Carbon Emissions

Reduced energy demand leads directly to lower carbon emissions, helping organisations meet environmental targets and future-proof their property portfolios.

Faster Regulatory Approval

Passing the air tightness test first time avoids delays with Building Control sign-off and helps projects remain on programme.

Increased Asset Value

Buildings with better energy performance are increasingly attractive to occupiers, investors and institutional landlords. Strong environmental performance can enhance rental value while reducing long-term operational expenditure.

As energy prices continue to rise and environmental legislation becomes more demanding, achieving excellent air tightness has become both a compliance requirement and a valuable commercial investment.

Accredited Expertise You Can Trust

Selecting an experienced, accredited testing provider is essential to achieving reliable, repeatable and fully compliant results.

APT Sound Testing is a UKAS-accredited ISO/IEC 17025 testing laboratory specialising in on-site air tightness testing for commercial and large-scale buildings. UKAS accreditation demonstrates that our testing procedures, reporting systems and quality management processes meet the highest recognised technical standards within the UK.

We are also an ATTMA Level 2 Registered Organisation, qualified to undertake testing on Large, Complicated and High-Rise (LCHR) buildings, including phased developments and zonal handovers. In addition, our ATTMA EA accreditation enables us to produce accurate envelope area calculations for complex commercial structures.

With more than 20 years of specialist industry experience, our engineers have successfully delivered testing and consultancy services on some of the UK’s most prestigious and technically demanding developments, including Battersea Power Station and the Imperial War Museum London.

Our combination of accredited competence, advanced testing equipment and practical construction experience allows us to deliver dependable results while helping clients achieve compliance as efficiently as possible.

Book Your Commercial Air Tightness Test

Commercial air tightness testing should never be viewed as a final hurdle at the end of construction. When planned correctly and supported by experienced specialists, it becomes an integral part of delivering an energy-efficient, compliant and high-performing commercial building.

APT Sound Testing provides nationwide commercial air tightness testing using the latest UKAS-calibrated modular blower door systems. We test everything from small commercial units to large warehouses, schools, offices, healthcare facilities and complex multi-storey developments.

Our engineers also provide advanced diagnostic services, including smoke tracing and thermal imaging, enabling us to quickly identify air leakage paths and support remedial works where required. This proactive approach helps maximise the likelihood of achieving a first-time pass while keeping projects on schedule.

If you’re planning a new commercial development or require testing for an existing project, our experienced team is ready to help.

Contact APT Sound Testing today by emailing info@aptsoundtesting.co.uk or call our friendly team on 07775 623464 to arrange your commercial air tightness test and ensure full compliance with UK Building Regulations.

Extractor Fan Testing
A Guide to Extractor Fan Testing

A Guide to Extractor Fan Testing

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Extractor Fan Testing: A Complete Guide to Part F Building Regulations

As modern homes become increasingly airtight and energy efficient, effective ventilation has never been more important. While improved insulation helps reduce energy consumption, it also means that moisture, pollutants and stale air can become trapped inside a property if ventilation systems are not performing correctly.

To ensure homes provide a healthy indoor environment, Approved Document F of the Building Regulations requires ventilation systems to be tested and commissioned before a building can be signed off.

What is Extractor Fan Testing?

Extractor fan testing measures the airflow performance of intermittent extract fans, such as those installed in kitchens, bathrooms and WCs, to ensure they meet the minimum ventilation rates specified in Approved Document F.

For new dwellings, the measured airflow rates must be submitted to Building Control before completion and handover.

At our company, we can carry out extractor fan testing alongside air tightness and sound insulation testing during the same site visit. This not only simplifies project coordination but also reduces costs and helps keep your build programme on schedule. As a UKAS-accredited company, you can be confident that all testing is carried out to the highest industry standards.

Why is Extractor Fan Testing Required?

Today’s homes are designed to minimise heat loss, making them significantly more airtight than older properties. Without adequate ventilation, moisture can build up, leading to condensation, mould growth and poor indoor air quality.

Approved Document F requires both:

  • Mechanical Ventilation with Heat Recovery (MVHR) systems
  • Intermittent extractor fans (such as kitchen and bathroom fans)

to be tested and commissioned to verify that they are operating efficiently and achieving the required airflow rates.

The results form part of the Building Regulations compliance process and are required before final approval can be issued.

Combining Part F and Part L Testing

Where possible, we carry out ventilation flow rate testing at the same time as your air pressure (air tightness) test.

This provides several benefits:

  • Reduced site visits
  • Lower overall testing costs
  • Easier project coordination
  • Faster Building Regulations compliance
  • Minimal disruption to your construction programme

Understanding the Four Ventilation Systems

Approved Document F identifies four main types of domestic ventilation systems.

System 1 – Background Ventilation with Intermittent Extract Fans

This is the most common system used in UK homes.

Fresh air enters through trickle vents in windows or background ventilators, while intermittent extractor fans remove moisture and odours from kitchens, bathrooms and utility rooms.

System 2 – Passive Stack Ventilation (PSV)

Passive Stack Ventilation relies on natural air movement created by wind pressure and thermal buoyancy.

Air enters through background ventilators and exits via passive roof terminals without the need for powered extract fans.

System 3 – Continuous Mechanical Extract Ventilation (MEV)

Mechanical Extract Ventilation continuously removes stale air from wet rooms using a central mechanical extract system.

Fresh air enters the property through background ventilators.

System 4 – Mechanical Ventilation with Heat Recovery (MVHR)

MVHR systems continuously extract stale air while supplying filtered fresh air throughout the property.

A heat exchanger recovers warmth from the outgoing air and transfers it to the incoming fresh air, improving energy efficiency while maintaining excellent indoor air quality.

Minimum Extract Rates

Approved Document F specifies the minimum airflow rates that extractor fans must achieve.

LocationMinimum Extract Rate
Kitchen (cooker hood)30 litres/second
Bathroom15 litres/second
WC / Sanitary accommodation6 litres/second

If your ventilation system fails to achieve these airflow rates, remedial work may be required before Building Control approval can be granted.

Preparing for Extractor Fan Testing

To ensure testing can be completed successfully, the following should be in place before our engineer arrives:

  • Electrical power connected to all extractor fans
  • All fans fully operational
  • Doors and windows installed
  • Window trickle vents fitted where required
  • Internal doors installed
  • Walls, ceilings and floors completed
  • Air barrier fully sealed around all ventilation terminals
  • Safe access to every extract point
  • Parking available within 50 metres of the property

We also require:

  • SAP calculation worksheets
  • Ventilation system specifications
  • Floor plans and sections (at least three days before testing)
  • Occupancy schedule for each dwelling

Installation Best Practice

Correct installation is just as important as selecting the right ventilation system. Before testing, it’s worth checking that:

  • Ductwork matches the manufacturer’s specification.
  • Duct runs are as short and straight as possible to minimise resistance.
  • Flexible ducting is only used where recommended.
  • All duct joints are correctly sealed.
  • Ventilation penetrations maintain the building’s airtightness.
  • Fans are securely fixed and correctly adjusted.
  • Internal doors have approximately 10mm undercuts where required.
  • Fan speeds have been commissioned using the manufacturer’s guidance.
  • Air handling units are securely mounted.
  • Adequate access has been provided for future maintenance.

Attention to these details can significantly improve airflow performance and reduce the likelihood of failing a compliance test.

Expert Advice and Testing Services

Whether you’re building a single dwelling or managing a larger residential development, we provide professional guidance to help you achieve compliance with Approved Document F.

Our experienced consultants can advise on ventilation systems, testing requirements and the most efficient way to combine extractor fan testing with air tightness and acoustic testing, helping you save both time and money.

If you have any questions about domestic ventilation testing or would like to arrange a site visit, get in touch with our team today by calling 01525 303 905 or contact us using our online form. We’re always happy to help you navigate the Building Regulations and ensure your project achieves compliance first time.