admin, Author at SoundTesting Services UK

Building Issues & Thermal Imaging Surveys

By admin | April 1, 2026 | Comments 0 Comment

Hidden Building Issues & Thermal Imaging Surveys

hen it comes to maintaining a building’s performance, comfort, and long-term value, thermal imaging surveys have become an essential part of modern property assessment. Using advanced infrared technology, these surveys detect subtle temperature differences across surfaces, highlighting issues that would otherwise remain hidden.

From pinpointing energy loss to uncovering water ingress and structural concerns, thermal imaging provides a clear, non-invasive way to diagnose problems early and accurately.

What Is Thermal Imaging?

Thermal imaging, also known as thermography, aptures infrared radiation emitted by objects. While this radiation is invisible to the human eye, thermal cameras translate it into visual images using colour variations to represent temperature differences.

These images reveal “thermal anomalies,” which can indicate underlying issues such as:

Heat loss from poor or damaged insulation
Moisture intrusion from leaks or damp
Overheating electrical systems
Structural defects affecting building integrity

Expertise You Can Trust

With over 15 years of experience delivering high-quality thermographic surveys across England and Wales, we support a wide range of industrial and commercial clients. Our detailed reports are designed to meet the requirements of construction professionals, insurers, facility managers, building control bodies, and sustainability assessors.

Thermal Imaging for Commercial Buildings

For commercial properties, thermal imaging surveys offer valuable insights into the performance of the building envelope, often at a relatively low cost. Many surveyors rely on us as a first point of contact when investigating building defects.

Beyond identifying heat loss, infrared surveys can help detect:

Energy inefficiencies – highlighting where improvements can reduce operational costs
Damp and moisture issues – locating water ingress in walls, ceilings, roofs, and rooflights
Water leaks – identifying faults within plumbing systems
Thermal bridging – spotting gaps or weaknesses in insulation around doors and windows
Insulation defects – revealing missing or poorly installed insulation
Air infiltration – detecting unwanted draughts affecting occupant comfort
Air leakage paths – showing where conditioned air is escaping, wasting energy

Thermal Imaging for Residential Properties

Thermal imaging surveys aren’t just for commercial buildings, they’re equally valuable for homeowners looking to improve comfort and reduce energy bills.

A residential survey can uncover:

Areas of significant heat loss
Damp or moisture problems, including roof or chimney leaks
Hidden plumbing leaks, including underfloor heating systems
Insulation gaps causing cold spots
Draughts entering through the building fabric
Warm air escaping unnecessarily

By identifying these issues early, homeowners can take targeted action to improve efficiency and reduce costs.

Supporting Sustainable Building Standards

Thermal imaging surveys also play a key role in sustainability assessments. They are widely recognised as part of best practice in evaluating building performance and are often required for environmental certification schemes.

Our surveys are carried out by highly qualified thermographers using advanced, high-resolution thermal imaging equipment. This ensures accurate, reliable results that support compliance with stringent environmental and performance standards.

A Smarter Way to Understand Your Building

Whether you’re managing a commercial property or improving your home, thermal imaging offers a powerful, non-destructive way to see what’s really happening beneath the surface.

If you’re looking to reduce energy costs, improve comfort, or diagnose hidden issues, a professional thermal imaging survey is a smart place to start.

To discuss your project requirements or arrange a site visit, contact APT Sound Testing on 01525 303905, email info@aptsoundtesting.co.uk, or visit www.aptsoundtesting.co.uk.

How Thermal Imaging Helps Surveyors

By admin | March 31, 2026 | Comments 0 Comment

How Thermal Imaging Helps Surveyors on Commercial Properties

When purchasing a commercial property, whether it’s an office, retail unit, or industrial building, understanding its true condition is essential. One increasingly valuable tool for surveyors is thermal imaging. But how exactly does it help?

Thermal imaging provides a deeper level of insight than traditional visual inspections, helping surveyors uncover hidden issues and give clients a clearer, more informed picture before committing to a purchase.

Key Benefits of Thermal Imaging for Property Buyers

1. Detecting Hidden Building Issues
Thermal imaging can reveal problems that aren’t visible to the naked eye. This includes electrical faults, water ingress, and defects within the building envelope. By identifying these issues early, surveyors can provide clients with a more accurate assessment of the property’s condition.

2. Improving Energy Efficiency
Heat loss is one of the biggest contributors to high energy costs in commercial buildings. Thermal imaging highlights areas where insulation is missing or ineffective, allowing buyers to plan targeted improvements that can significantly reduce future energy bills.

3. Enhancing Safety
Overheating electrical components are a common fire risk. Thermal imaging allows surveyors to detect these hazards before they become serious problems, ensuring necessary repairs can be carried out prior to occupancy. It can also minimise the need for working at height or accessing restricted areas.

4. Non-Invasive Inspection
Unlike traditional investigative methods, thermal imaging does not require drilling or dismantling parts of the building. This means surveyors can carry out thorough inspections quickly and without causing damage.

5. Pest Detection
Thermal cameras can even detect the presence of pests by identifying heat signatures behind walls or within ceiling and floor voids. Early detection helps prevent structural damage and potential health risks.

6. Stronger Negotiation Position
Armed with clear evidence of defects, buyers are in a stronger position to negotiate. Whether requesting repairs or a reduction in purchase price, thermal imaging findings can provide valuable leverage during the transaction.

How Thermal Imaging Inspections Work

Thermal imaging surveys use advanced infrared technology to detect temperature variations across surfaces.

Infrared Technology
High-resolution thermal cameras capture heat signatures and translate them into colour-coded images. These images make it easy to identify abnormal temperature patterns that may indicate underlying issues.

Areas Covered
Surveyors typically scan key areas of the building, including walls, ceilings, floors, insulation, plumbing systems, and electrical installations. This comprehensive approach ensures that hidden defects are not overlooked.

Common Issues Identified

Thermal imaging can uncover a wide range of problems. Some of the most common include:

Water leaks and moisture – Cooler areas often indicate the presence of moisture within walls, ceilings, or floors.
Insulation gaps – Missing or inadequate insulation in roofs, walls, or floors becomes immediately visible.
Electrical faults – Overheating components can be identified before they lead to failure or fire.
Structural defects – Hidden cracks or irregularities within the building fabric can sometimes be detected through temperature variation.

Why It Matters

Ultimately, thermal imaging gives buyers confidence. By providing a detailed and non-invasive assessment, it ensures there are no costly surprises after purchase—helping clients make informed, strategic decisions.

Book a Thermal Imaging Survey

If you’re considering a thermal imaging survey for a commercial property, working with experienced and certified professionals is key.

At APT Sound Testing, inspections are carried out using high-specification equipment that exceeds industry standards, including BREEAM requirements. Surveys are conducted by Level 3 certified thermographers, the highest level of accreditation, using large-format FLIR thermal imaging cameras.

Each survey includes:

Level 3 thermographic certification
Level 3 qualified electrical thermographers
High-resolution FLIR cameras with 45-degree lenses
A detailed report with thermal indexing, fault diagnosis, and severity grading

If you need a thermal survey to a commercial property, please let us know and we will book in the first available date for you. If you have any further questions in regard to the above, please don’t hesitate to call APT Sound Testing on 01525 303905 or email: info@aptsoundtesting.co.uk

Floor Plenum Testing Services

By admin | March 24, 2026 | Comments 0 Comment

Floor Plenum Testing: What You Need to Know

BG 65/2016 Floor Plenum Testing Guidance sets out the methodology for testing floor plenum airtightness, and it’s a standard that APT Sound Testing follows closely on every project.

But what exactly is a floor plenum, and why does airtightness matter so much?

What Is a Floor Plenum?

A floor plenum is the void between a building’s structural floor and a raised access floor. This space is commonly used to distribute conditioned air throughout a building.

For the system to work efficiently, that air must flow into the occupied space, not escape into cavities, risers, stairwells, or other adjacent areas. When a plenum is properly sealed, diffusers and grilles can deliver air at the correct flow rate, ensuring comfort and performance.

What Is Floor Plenum Testing?

If your building includes floor or ceiling plenums, airtightness testing is essential. Surprisingly, around 70–75% of plenums fail their first air test.

With extensive experience in raised access floor testing, APT Sound Testing helps clients avoid that outcome. By getting involved early, testing can be carried out as soon as the floor is installed, identifying issues before they become costly problems.

What the process involves:

Initial air pressure testing
Smoke surveys to detect leakage paths
A detailed report highlighting problem areas
Guidance for sealing contractors to resolve issues

This proactive approach significantly improves the chances of passing the test first time.

Why Do So Many Plenums Fail?

There isn’t just one reason, failures usually come down to a combination of factors.

One of the biggest issues is a lack of awareness around how airtight a plenum actually needs to be. While systems may perform well in laboratory conditions, real-world construction introduces complications.

Multiple trades often need to run cables, pipes, and services through the plenum. Every penetration is a potential leakage point, and without proper sealing, performance drops quickly.

Key Considerations During Construction

Achieving airtightness starts long before testing. Here are some of the most important factors to consider:

1. Raised Access Floor and Finishes

Carpet tiles are often installed over raised floors. If their joints don’t align with the floor panels, and especially if they’re glued, they can help reduce leakage.

However, finishes should never be relied on as the primary airtightness solution, as they can degrade over time.

2. Service Boxes and Penetrations

Electrical and data floor boxes can significantly contribute to air leakage if not properly specified and sealed.

Any penetration — whether for cabling or fixtures — must include a designed airtight sealing solution.

3. Perimeter Sealing

The junction between the raised floor and surrounding walls is a common weak point.

Improving this area may involve:

Installing metal angle supports
Using closed-cell insulation or neoprene strips
Ensuring continuous sealing along the perimeter

4. Wall Construction

Plenum walls are particularly vulnerable to leakage.

Plasterboard systems must have all joints sealed
Fire-rated boards should meet airtightness standards
Materials should offer long-term durability (e.g. 25+ years lifespan)

5. Floor Structure

Different floor types behave differently:

In-situ concrete: generally airtight
Precast planks: require sealing at joints and penetrations
Beam and block: should be covered with a screed layer

How Floor Plenum Air Testing Works

The floor plenum testing process is straightforward but highly controlled:

A floor tile is removed and replaced with a sealed fan unit
All ductwork in the test zone is isolated and sealed
Pressure tubes are installed via a secondary tile
A calibrated fan is used to pressurise the plenum
Pressure readings are recorded and compared against specifications

If the plenum fails, a smoke survey is carried out to visually identify leakage paths, making it easier to target remedial work.

Why Early Testing Matters

Testing early in the construction process allows issues to be identified and resolved before completion. This reduces delays, avoids rework, and improves overall system performance.

APT Sound Testing works closely with project teams to recommend appropriate specifications, carry out testing, and support successful outcomes.

Get Expert Support

If you’re planning a project involving raised access floors, getting expert advice early can make all the difference.

APT Sound Testing offers:

Site visits and tailored recommendations
Full airtightness testing services
Detailed reporting and practical guidance

To learn more, get in touch with APT Sound Testing or their team by calling 01525 303905 or email: info@aptsoundtesting.co.uk to discuss your requirements.

Thermal Imaging Surveys & Modern Buildings

By admin | March 19, 2026 | Comments 0 Comment

Thermal Imaging Surveys: Essential for Modern Buildings

Maintaining the performance, safety, and energy efficiency of a building isn’t always straightforward, especially when many issues remain hidden from view. That’s where thermal imaging surveys come in.

Using advanced infrared technology, thermal imaging allows us to see what the naked eye cannot. By detecting subtle temperature variations, these surveys help uncover hidden defects early, before they escalate into costly repairs or operational disruptions.

From heat loss and water ingress to electrical faults and structural concerns, thermal imaging provides a powerful, non-invasive way to assess the true condition of a building.

With over 15 years of experience delivering high-quality thermographic surveys across England and Wales, we support industrial and commercial clients with detailed reports that meet the standards required by construction and insurance companies, facility managers, building control, and BREEAM assessors.

What Is Thermal Imaging?

Thermal imaging — also known as thermography — is a technique that captures the infrared radiation naturally emitted by objects. While this type of radiation is invisible to the human eye, specialist thermal cameras can detect it and convert it into clear, colour-coded images.

These images highlight temperature differences across surfaces, making it easy to spot irregularities that may indicate underlying issues.

Common problems identified through thermal imaging include:

Heat loss caused by missing or poorly installed insulation
Moisture intrusion from leaks or damp conditions
Electrical faults due to overheating components or wiring issues
Structural defects linked to compromised building elements

In short, thermal imaging offers a fast, accurate, and highly effective way to diagnose problems that would otherwise go unnoticed.

The Value of Thermal Imaging for Commercial Buildings

For commercial properties, thermal imaging surveys are particularly valuable. They provide detailed insight into how a building performs thermally, without disruption and at a relatively low cost.

That’s why many surveyors and property professionals rely on thermal imaging as a first step in identifying defects.

An infrared survey can reveal much more than just heat loss. It can help identify:

Energy inefficiency – Pinpointing where energy is being lost and where savings can be made
Damp and water ingress – Locating leaks in roofs, walls, and floors
Plumbing issues – Detecting hidden water leaks within building systems
Thermal bridging – Highlighting weak points around doors, windows, and structural junctions
Insulation defects – Revealing gaps or poorly installed insulation
Air infiltration – Identifying cold draughts entering the building
Excess air leakage – Showing where warm air escapes, leading to energy waste or overheating

Thermal Imaging and BREEAM Compliance

Thermal imaging surveys now play a key role in BREEAM, the world’s leading environmental assessment method for buildings.

Both BREEAM New Construction and Domestic Refurbishment schemes award credits for thermal imaging inspections carried out by qualified professionals (Level 2 thermographers or above).

With more than a decade of experience delivering BREEAM-compliant surveys, APT Sound Testing provides reliable assessments to verify insulation continuity and overall thermal performance. All surveys are conducted by Level 3 certified thermographers using high-resolution FLIR cameras, ensuring precise and dependable results that meet strict industry standards.

Why Choose a Professional Thermal Imaging Survey?

A professional thermal imaging survey offers far more than just peace of mind. It delivers practical, measurable benefits, including:

Accurate identification of heat loss, moisture, and electrical issues
Improved energy efficiency and reduced running costs
Preventative maintenance, fixing issues before they become expensive problems
Non-invasive testing with no damage to the building
Safer inspections without the need for working at height
Fast turnaround times with clear, actionable reports
Expert analysis from certified Level 3 thermographers
High-resolution imaging using advanced infrared technology
Detailed reports with severity ratings and tailored recommendations
Long-term cost savings through early intervention

Common Issues Revealed by Thermal Imaging

Thermal imaging surveys regularly uncover:

Heat loss from poor insulation or structural gaps
Hidden moisture caused by leaks or damp conditions
Overheating electrical components and overloaded circuits
Structural movement, cracks, or material degradation

Identifying these issues early can make a significant difference—both in terms of cost and building performance.

Book Your Thermal Imaging Survey

If you want to improve your building’s efficiency, reduce energy costs, and catch problems before they escalate, a thermal imaging survey is a smart investment.

APT Sound Testing’s experienced team is ready to help you protect your property and optimise its performance with accurate, reliable diagnostics.

Phone: 01525 303905
Email: info@aptsoundtesting.co.uk
Website: www.aptsoundtesting.co.uk

BS4142 Noise Impact Assessments

By admin | March 17, 2026 | Comments 0 Comment

BS4142 Noise Impact Assessments for Planning Applications

If your planning condition requires a noise survey in accordance with BS4142, APT Sound Testing can help.

At APT Sound Testing, we understand that industrial and commercial noise is playing an increasingly important role in the planning process. With the government encouraging redevelopment of brownfield sites, industrial and residential areas are being built closer together — often raising concerns about how noise emissions may affect local communities and living standards.

Why a BS4142 Noise Assessment Matters

Local authorities use BS4142 assessments to control noise levels from industrial or commercial sources. These surveys help determine whether noise from new or existing sites — such as factories, plants, or mechanical equipment — could cause adverse effects for nearby residents. They are often essential for achieving planning approval and ensuring compliance with local noise regulations.

A BS4142 noise survey works by comparing the “rating level” of the noise source with the background sound level. The greater the difference between these two, the higher the likelihood of noise disturbance. Our specialist consultants can identify potential impacts and recommend practical mitigation measures to reduce nuisance and achieve compliance.

What We Assess

We assess all types of industrial and commercial noise sources, including:

Mechanical and electrical systems such as air conditioning and extraction equipment
Manufacturing processes and fixed plant machinery
Loading and unloading operations
Site vehicle movements, such as forklifts, lorries, or other operational traffic

Our BS4142 Survey Process

Background Survey – Measure existing environmental sound levels when the proposed noise source is not operating.
Noise Source Measurement – Record sound from the plant, machinery, or process under assessment.
Analysis & Character Correction – Apply BS4142 penalties for tonal, impulsive, or intermittent characteristics.
Impact Assessment – Compare the “rating level” with background sound (LA90) to determine potential impact.
Mitigation & Reporting – Provide a detailed report with recommendations, noise mapping, and practical solutions.

Equipment and Expertise

We use state-of-the-art Norsonic acoustic equipment to ensure precise, compliant results. Our consultants have extensive experience conducting BS4142 surveys across a range of industrial sites and can also model predicted noise impacts for proposed developments.

Whether you are introducing new equipment or addressing an existing noise complaint, our full BS4142-compliant surveys will help you demonstrate compliance and protect amenity values.

Get in Touch

If your local authority has requested a BS4142 Noise Assessment, contact APT Sound Testing today.
Call 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project with one of our acoustic consultants.

Sound Testing Services in the UK

By admin | March 17, 2026 | Comments 0 Comment

Sound Testing in London and the UK

When planning a property development in London or the wider UK, sound insulation isn’t just a design consideration, it’s a regulatory requirement. Unless your plans were fully approved before 1 July 2003, you’ll need to carry out sound testing between rooms or spaces that share separating walls or floors, in line with Building Regulations Part E. This ensures that sound transmission between adjoining areas is kept within acceptable limits.

It’s worth noting that sound testing is not typically required for internal walls and floors within a single dwelling, flat, or residential room. However, these internal partitions should still be designed to achieve a minimum performance of 40dB to maintain a good standard of acoustic comfort.

Which developments require sound testing?

Sound testing applies to:

Residential units created through the conversion of existing buildings, as well as new-build rooms for residential use, where work started after 1 July 2004.
New-build houses and flats where construction began after the same date.

The primary goal of sound insulation testing is to confirm that the required standards haven’t been compromised by poor design or workmanship. In practice, this means testing each type of construction used within a development. For example, if your project includes a mix of brick, blockwork, timber, and metal stud walls, each construction type must be tested, followed by a 10% sample of each.

To put this into perspective, a development of 25 flats would typically require three sets of six tests. Each “six-pack” includes:

2 airborne wall tests
2 airborne floor tests
2 impact sound tests

If any of these tests fail, additional testing may be required. More importantly, failures usually indicate issues with design or construction, meaning the affected partitions must be reviewed and improved before retesting.

Designing for acoustic performance

Achieving compliance with Part E starts at the design stage. Key considerations include:

Planning layouts carefully to avoid placing noisy or “habitable” rooms directly next to each other
Selecting materials with sufficient mass and density
Ensuring proper isolation between structural elements
Paying close attention to junctions between walls, floors, and ceilings
Using appropriate components such as acoustic wall ties
Avoiding back-to-back placement of sockets and flues
Sealing all joints and service penetrations effectively
Incorporating cavity closers around openings
Containing noise in high-impact areas like lift shafts
Reducing reverberation in communal spaces with absorbent materials

Without proper acoustic design, floors and ceilings often become the main pathways for sound transmission. This includes both airborne noise — such as voices and televisions — and impact noise, like footsteps or dropped objects. Controlling both types requires a well-thought-out combination of materials and detailing.

A practical acoustic upgrade example

For conversion projects, a cost-effective floor upgrade can significantly improve acoustic performance. A typical approach might include:

Retaining existing floor joists
Installing 22mm chipboard above the joists
Adding an acoustic resilient membrane
Laying a 22mm engineered floor finish
Filling the joist cavity with 100mm acoustic mineral wool
Fixing a resilient hanger system beneath the joists
Installing two layers of 12.5mm acoustic plasterboard with staggered joints

This type of build-up helps reduce both airborne and impact sound transmission.

A structured approach to compliance

To help ensure compliance with Approved Document E, many developers follow a structured acoustic design process:

Site survey visits to assess existing construction and identify potential issues
Sample sound testing to establish baseline acoustic performance
Acoustic design review of proposed walls and floors
Pre-completion testing to confirm compliance before handover

Final thoughts

Sound testing is more than just a box-ticking exercise, it’s a critical part of delivering comfortable, high-quality living spaces. By considering acoustics early in the design process and following a structured testing approach, developers can avoid costly failures and ensure their projects meet the required standards from the outset.

APT UK Sound Testing Services
APT Sound Testing can advise on all types of acoustic design, whether it’s accomplished during initial construction or during a refurbishment/renovation project. We also undertake UKAS accredited sound testing across London and the wider UK, providing a ‘one stop’ solution for all your acoustic requirements.

If you would like more information in regard to sound testing please visit the APT Sound Testing website or call our friendly team on 01525 303905.

The BS8233 Noise Assessment

By admin | March 10, 2026 | Comments 0 Comment

The BS8233 Noise Assessment: What You Need to Know

Navigating the planning process for a residential development can be confusing. With numerous permissions, regulations, and assessments to consider, it’s not always clear which are necessary, or what they actually mean.

One assessment you’re likely to encounter is the BS8233 noise assessment. This evaluation focuses on noise levels associated with your development and is often a requirement for obtaining planning permission. If you’re planning a residential project in London or elsewhere in the UK. This guide is designed to help you understand what a BS8233 noise assessment involves and why it matters.

What Is a BS8233 Noise Assessment?

A BS8233 noise assessment is based on the standard “Guidance on Sound Insulation and Noise Reduction for Buildings”. It’s designed to assess noise from external sources, such as traffic or neighbouring properties, as well as internal sources, like plant or building services. The goal is to understand the impact of noise on future occupiers and provide guidance on how to mitigate it.

The assessment outlines recommended noise levels for different scenarios, both inside and outside the building, during the day and at night. It also gives advice on sound insulation design and noise reduction strategies, applicable to both new builds and refurbishment projects.

Why Might You Need One?

Local authorities often request a BS8233 2014 noise assessment when reviewing planning applications for:

>>> New residential apartments or houses

>>> Hotels or mixed-use developments

>>> Sites near busy roads, railways, or other noisy environments

The assessment helps the council determine how much additional noise your development may generate and what measures can be implemented to reduce it.

Typically, the process involves:

>>> Measuring existing ambient noise levels

>>> Predicting noise generated by the development

>>> Considering secondary impacts, like increased traffic on nearby roads

>>> Modelling and testing potential noise mitigation solutions

BS8233 Noise Exposure Categories (NECs)

In the UK, noise planning guidance is structured around Noise Exposure Categories (NECs). These categories, determined by on-site noise measurements, guide how much noise should influence planning decisions.

>>> Noise-sensitive developments in high-noise areas are closely scrutinized

>>> Brownfield sites, often noisier than greenfield sites, require special consideration

>>> NECs inform the design of noise mitigation measures, such as enhanced glazing or ventilation

For most residential buildings, achieving the required internal noise levels depends heavily on the building envelope, particularly the glazing system. Sound insulation testing is then carried out in line with Approved Document E of the Building Regulations.

How APT Sound Testing Can Help

At APT Sound Testing, we have extensive experience carrying out BS8233 noise assessments for planning applications across all types of developments. Our team provides:

>>> ISO-compliant, UKAS-accredited surveys and sound testing

>>> Advanced noise modelling to evaluate potential mitigation options

S>>> tate-of-the-art Norsonic sound testing equipment

If you’re unsure about your project’s acoustic requirements, or if your local authority has requested a BS8233 2014 noise survey, our experts are ready to help. Call us on 01525 303905 or email info@aptsoundtesting.co.uk today.

Air Tightness Testing Across the UK

By admin | March 9, 2026 | Comments 1 comment

Air Tightness Testing – APT Sound Testing

At APT Sound Testing, we provide professional Air Tightness Testing services across the United Kingdom, supporting projects of all sizes, from single residential dwellings to large-scale commercial developments. Our experienced team works closely with developers, contractors, and property owners to ensure buildings meet the required performance standards and achieve compliance with UK Building Regulations.

What sets us apart is that we are UKAS-accredited to carry out both Air and Sound Testing in accordance with Building Regulations and industry standards. Because our engineers are multi-skilled and fully accredited, we can perform Air, Sound, and Ventilation Testing during the same visit. This combined approach saves our clients time and money while improving on-site coordination. Unlike many providers, all of our testing is carried out by our own in-house engineers, we never subcontract our work.

Why Air Tightness Testing Is Required

Air tightness testing became a legal requirement in 2006 in England and Wales under Building Regulations Part L, which focuses on the conservation of fuel and power. The goal is to create more energy-efficient buildings by reducing uncontrolled air leakage.

Air leakage refers to the uncontrolled movement of air through gaps, cracks, and joints in the building fabric, something most people simply recognise as draughts.

Reducing these air leakage paths helps:

Improve energy efficiency
Reduce carbon emissions
Lower heating and cooling costs
Improve indoor comfort

When energy escapes through a building’s fabric, it contributes to what is known as the Building Emission Rate (BER). To meet regulatory standards, new developments must achieve specific air leakage targets.

Typical targets include:

Standard dwellings: around 5.0 m³/hr/m²
Commercial buildings: often 3.0 m³/hr/m² or lower

The Impact of Poor Air Tightness

Air infiltration and exfiltration occur simultaneously in buildings. If air enters in one location, it must exit somewhere else.

Poor air tightness can lead to several problems:

1. Increased Energy Loss

Air leaking out of a building must be replaced by conditioned air that needs heating or cooling. This significantly increases energy consumption and operational costs.

2. Condensation and Moisture Issues

In winter, warm indoor air can escape into colder wall cavities where moisture condenses. This can lead to:

Mould growth
Rot
Structural damage
Poor indoor air quality

3. Indoor Comfort Problems

Draughts can make buildings uncomfortable for occupants. In extreme cases, excessive air leakage can disrupt normal building use.

For example, during one investigation we conducted smoke testing on a building where employees refused to work due to constant draughts. The building had an air leakage rate of 25 m³/hr/m². After identifying and sealing the leakage paths, the building achieved below 5 m³/hr/m², resolving the issue.

4. Pollution Ingress

Excessive air leakage can draw polluted air into buildings from nearby sources such as:

Busy roads
Fuel stations
Waste areas
Restaurants

Creating a well-sealed air barrier helps control indoor air quality and minimise pollutant entry.

Our Air Tightness Testing Process

At APT Sound Testing, we use professional blower door testing equipment to measure air leakage accurately.

Step 1: Install the Blower Door System

Our fan system is mounted into a standard door opening (approximately 900mm x 2000mm) and adjusted to fit securely within the frame.

Step 2: Environmental Measurements

Before testing begins, we record environmental data including:

Internal and external temperatures
Barometric pressure
Ambient conditions

Step 3: Pressure Testing

The fan system is activated and pressure readings are taken between 25 Pa and 70 Pa in 5 Pa increments. These readings allow us to measure airflow through the building envelope.

Step 4: Final Calculations

Once measurements are complete, our technicians calculate the air leakage rate at 50 Pascals (m³/h·m² @ 50Pa) based on the airflow required to maintain that pressure difference.

Step 5: Smoke Testing (Leak Detection)

The building is then pressurised to around 50 Pascals, forcing air through any gaps or leakage paths. Using smoke testing equipment, our engineers walk through the property to identify and record the exact locations of air leaks.

This diagnostic stage helps contractors quickly locate and seal problem areas.

How Long Does Testing Take?

A typical air tightness test and smoke investigation usually takes 2–3 hours per building.

However, we can remain on site for the full day if required. This allows contractors to carry out sealing works immediately, followed by re-testing if necessary.

If you plan to undertake remedial work during the test day, it is helpful to have materials such as:

Mastic sealant
Expanding foam
Draught excluders
Plasterboard
Grip fill adhesive
Safe access equipment

Air Tightness Consultancy and Design Support

Achieving the required air tightness target is becoming increasingly challenging as regulations continue to tighten. That is why we strongly recommend considering air leakage control during the design stage of a project.

Our consultancy services include:

Air tightness design reviews
Construction stage advice
Pre-completion testing support
Leakage investigation and reporting

By working with our clients throughout the design and construction process, we can help identify potential issues early and significantly reduce the risk of failing the final test.

Combined Air and Sound Testing Packages

Most of our clients now choose our combined pre-completion testing packages, which include:

Air Tightness Testing
Sound Insulation Testing
Ventilation Testing

Because our engineers are UKAS accredited in multiple disciplines, we can complete all tests during the same site visit. This eliminates the need to coordinate multiple companies and greatly simplifies site scheduling.

Additional benefits include:

Reduced testing costs
Faster project completion
Improved on-site coordination

We also offer out-of-hours testing, including weekend appointments, to minimise disruption during working hours.

Nationwide Air Tightness Testing You Can Trust

APT Sound Testing has extensive experience conducting thousands of successful air tightness tests across London and the UK. Our knowledgeable consultants provide friendly, practical advice to help your project meet regulatory requirements quickly and efficiently.

If you’re preparing for an upcoming test, we also provide a helpful air tightness checklist to ensure your building is fully prepared.

✅ Need help with air tightness testing?
Contact our team today to discuss your project requirements and receive expert guidance from our experienced air tightness consultants. Call 01525 303905 or email: info@aptsoundtesting.co.uk and we will respond as quickly as we can.

Air Tightness Testing Services in the UK

By admin | March 3, 2026 | Comments 0 Comment

Air Tightness Testing Across the UK

At APT Sound Testing, we provide comprehensive air tightness testing services throughout the United Kingdom. Our experienced team works on projects of all sizes — from single residential dwellings to large-scale commercial developments.

We are proud to be one of the few UKAS-accredited companies qualified to carry out both Air and Sound Testing in full compliance with UK Building Regulations and Standards. This accreditation allows us to deliver combined Air, Sound, and Vent Testing packages during a single site visit — saving our clients time, reducing costs, and improving on-site coordination. Importantly, we never subcontract our testing work; all services are delivered by our fully trained in-house engineers.

Why Air Testing Matters

Since 2006, air testing has been a legal requirement in England and Wales under Part L of the Building Regulations. Its importance continues to grow as the construction industry focuses on reducing carbon emissions and improving energy efficiency.

Part L defines air leakage as the uncontrolled flow of air through gaps and cracks in a building’s structure — commonly known as draughts. When buildings lose energy through their fabric, this contributes to the building emission rate (BER). To meet regulatory approval, new developments must achieve strict air permeability targets:

Standard dwellings: Typically 5.0 m³/hr/m²
Commercial buildings: Often around 3.0 m³/hr/m² or lower

Improving airtightness reduces unnecessary heat loss, lowers energy consumption, and contributes to greener, more sustainable buildings.

The Risks of Poor Air Tightness

Air infiltration and exfiltration can create a range of issues:

Energy Loss: Escaping air must be replaced and conditioned, increasing heating and cooling demands.
Condensation & Mould: In winter, warm moist air entering cold cavities can cause condensation, mould growth, and structural damage.
Uncomfortable Draughts: Uncontrolled airflow can make both residential and commercial properties unpleasant to occupy.
Indoor Air Quality Concerns: Air leakage can allow polluted external air to enter buildings, particularly in locations near busy roads, fuel stations, restaurants, or waste storage areas.

We have previously tested buildings with air leakage rates as high as 25 m³/hr/m² — far above acceptable levels. After identifying and sealing leakage paths, the same buildings were brought below 5 m³/hr/m², dramatically improving comfort and performance.

Our Consultancy & Pre-Completion Support

Achieving compliance starts at the design stage. We offer air tightness consultancy and detailed design reviews to help ensure your project meets its targets first time.

Our support includes:

Early-stage air leakage line design advice
Pre-completion inspections
On-site testing for building control sign-off
Weekend and out-of-hours testing services to minimise disruption

To avoid costly failures, we strongly recommend considering air barrier design as early as possible in your project.

Combined Air & Sound Testing Packages

Because our multi-skilled engineers are UKAS accredited for both disciplines, we offer significant savings through combined testing packages. Our popular “3-Step Pre-Completion Package” allows clients to avoid employing multiple contractors, simplifying project management and improving efficiency.

By conducting both tests on the same day in a structured and coordinated manner, we help streamline site operations and reduce downtime.

What Is a Blower Door Test?

Air tightness testing is carried out using blower door equipment, which measures:

The airflow entering or leaving a building
The pressure difference across the building envelope

This data helps estimate energy performance under various weather conditions and supports equipment sizing and energy consumption predictions.

Using blower door and smoke testing, we can accurately locate leakage paths. While some issues stem from large, obvious gaps, more often it is multiple smaller leaks that contribute most significantly to poor results. Our experienced engineers quickly identify and document these areas so corrective action can be taken efficiently.

Protecting Energy Performance and Occupant Health

Excessive air leakage can:

Increase heating and cooling costs
Cause condensation, mould, and rot
Reduce occupant comfort
Allow outdoor pollutants to enter the building

A well-designed and properly installed air barrier is essential for controlling both air quality and air quantity within a building.

Work With Experienced Air Tightness Specialists

APT Sound Testing has extensive experience delivering thousands of successful air tightness tests across London and the wider UK. Our in-depth knowledge of Approved Document L ensures your development is supported from concept through to completion.

By working collaboratively with clients throughout the design and construction phases, we help identify practical solutions to minimise air leakage and achieve compliance first time.

If you are preparing for an upcoming test, we recommend reviewing an air tightness checklist to ensure your project is ready.

For friendly, expert advice tailored to your development, contact our team today on 01525 303905 or via our online contact form to discuss your air testing requirements.

APT Sound Testing & Acoustic Compliance

By admin | March 2, 2026 | Comments 0 Comment

A Friendly, Proactive Approach to Acoustic Compliance

Acoustic compliance doesn’t have to be complicated. We take a friendly, forward-thinking approach that supports your project from the earliest design stages through to pre-completion testing and final certification.

Our services include:

Acoustic design and consultancy
Sound insulation testing
Pre-completion testing and certification
Specialist cleanroom testing

With many years of experience across both public and private sectors, we work with a broad range of clients, from self-builders and independent developers to major national housebuilders. We also support specialist industries such as healthcare and banking, where precision testing and flexible scheduling are often critical.

Clients consistently tell us they value not only our technical expertise but also our approachable, solutions-focused mindset. It’s this combination that has helped us achieve one of the highest return-client rates among pre-completion testing consultancies in the UK.

Local Expertise, National Coverage

While we operate across the UK, our centrally located London office allows us to respond quickly to urgent testing and survey requirements in the capital and surrounding areas.

Unlike many providers, we never subcontract our services. Every sound test is carried out by our in-house engineers, ensuring complete consistency, quality control, and accountability from start to finish.

We understand that construction timelines can be demanding, which is why we regularly accommodate last-minute bookings and weekend testing, particularly for clients in fast-paced sectors such as banking and commercial fit-outs.

Qualified Engineers, Accredited Standards, Modern Equipment

Our experienced engineers bring decades of combined acoustic design knowledge to every project. From initial consultation to final certification, we provide practical guidance tailored to your development’s specific requirements.

As a multi-UKAS accredited laboratory operating to strict ISO standards, we maintain the highest levels of professionalism and quality assurance. We also invest in state-of-the-art acoustic testing equipment, fully calibrated to UKAS standards, to ensure precise and dependable results every time.

Integrated Acoustic and Air Tightness Testing

To make compliance simpler and more cost-effective, we also offer UKAS-accredited air tightness testing in-house. By combining sound and air testing within one coordinated service, we help reduce administrative complexity, streamline scheduling, and keep your project moving smoothly.

Speak to Our Team

Whether you need expert advice or want to arrange a sound test, our friendly and knowledgeable team is ready to help. Get in touch via our online contact form or call 01525 303905 to discuss your project and arrange a tailored testing solution.