Benefits of Thermal Imaging for Buildings

By admin | August 13, 2026 | Comments 0 Comment

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

By admin | August 7, 2026 | Comments 0 Comment

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.

Commercial Air Tightness Testing

By admin | August 3, 2026 | Comments 0 Comment

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.

A Guide to Extractor Fan Testing

By admin | July 27, 2026 | Comments 0 Comment

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.

Location	Minimum Extract Rate
Kitchen (cooker hood)	30 litres/second
Bathroom	15 litres/second
WC / Sanitary accommodation	6 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.

BREEAM Indoor Air Quality Testing

By admin | July 23, 2026 | Comments 0 Comment

BREEAM Indoor Air Quality Testing – Why It Matters

When it comes to creating healthy, comfortable buildings, indoor air quality is just as important as energy efficiency or acoustic performance. That’s why BREEAM places such a strong focus on ensuring the air inside a building is safe for the people who use it every day.

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

Whether you need an Indoor Air Quality Plan, post-construction air quality testing, or expert advice throughout your project, our experienced team is here to make the process straightforward from start to finish.

What is BREEAM Indoor Air Quality Testing?

BREEAM Indoor Air Quality Testing is designed to assess the quality of the air within a newly completed building before it is occupied. The aim is simple – to minimise harmful pollutants and create healthier indoor environments for future occupants.

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

Total Volatile Organic Compounds (TVOCs)
Formaldehyde

If required, we can also test for additional pollutants depending on your project’s specific requirements.

The Two Stages of BREEAM Hea02

To achieve the available BREEAM credits under the Hea02 category, there are two important stages.

Stage 1 – Indoor Air Quality Plan (IAQP)

The first step is producing an Indoor Air Quality Plan during the design stage of your project.

This plan helps reduce the risk of poor indoor air quality by considering factors such as ventilation strategies, construction methods, building materials, and future maintenance. By identifying potential sources of contamination early, your project can be designed to provide a healthier environment for everyone who will use the building.

Our bespoke Indoor Air Quality 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 prepare for third-party testing
Guidance on maintaining good indoor air quality after occupation
Independent testing and analysis

Stage 2 – Post-Construction Indoor Air Quality Testing

Once construction is complete and the building’s HVAC system is fully operational, it’s time for the post-construction Indoor Air Quality Test.

During our site visit, we collect air samples from representative occupied spaces, such as offices, classrooms, healthcare facilities, apartments, or other regularly occupied rooms.

The samples are analysed to measure pollutant levels against the limits specified by BREEAM. If any readings exceed the required thresholds, we’ll explain the findings clearly and recommend practical steps to help bring the building into compliance.

Why Choose APT Sound Testing?

We’ve helped clients across the UK successfully achieve BREEAM, Home Quality Mark (HQM), and other environmental compliance standards through reliable, accurate Indoor Air Quality Testing.

When you work with APT Sound Testing, you can expect:

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

We understand that preparation is often the key to achieving compliance, which is why we’re always happy to provide practical advice before we even arrive on site.

Preparing for Your Air Quality Test

A successful Indoor Air Quality Test starts with good preparation. Our team provides a comprehensive checklist to ensure your building is ready before testing begins, helping to avoid unnecessary delays or repeat visits.

If you’re planning a BREEAM assessment, we’d be happy to provide our Indoor Air Quality Testing Checklist to help your project stay on track.

Need BREEAM Indoor Air Quality Testing?

If you’re looking for a trusted partner to carry out your BREEAM Indoor Air Quality Testing, APT Sound Testing is here to help.

From creating your Indoor Air Quality Plan to completing post-construction testing and reporting, we’ll guide you through every stage of the process with friendly advice and professional support.

Get in touch with our team today on 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project. Alternatively, visit our Contact page to request a quotation.

Air Tightness Testing: Improving Building Performance

By admin | July 10, 2026 | Comments 0 Comment

Expert Air Tightness Testing Across the UK

APT Sound Testing provides professional Air Tightness Testing services throughout the United Kingdom, supporting projects of all sizes — from individual residential properties to large-scale commercial developments.

As one of the few companies in the UK accredited by UKAS to undertake both Air and Sound Testing, we provide a complete testing solution that helps clients achieve Building Regulations compliance efficiently. Our experienced engineers can complete Air Tightness, Sound Insulation and Ventilation Testing packages during the same visit, improving site coordination while reducing costs.

Unlike many testing companies, we do not subcontract our work. Every project is completed by our own highly skilled and accredited engineers, ensuring consistent quality, reliability and expert advice from start to finish.

Why is Air Tightness Testing Required?

Air Tightness Testing became a legal requirement in England and Wales in 2006 under Building Regulations Part L, which focuses on the conservation of fuel and power.

Today, airtightness testing plays an increasingly important role in creating energy-efficient, low-carbon buildings. Poor airtightness allows uncontrolled air leakage through gaps and cracks in the building fabric, resulting in unnecessary heat loss, increased energy consumption and higher carbon emissions.

Building Regulations define air leakage as the uncontrolled movement of air through the gaps and openings within a building’s structure. In everyday terms, this is what we commonly experience as draughts.

By reducing unwanted air leakage, buildings can retain heat more effectively, improve energy performance and provide a more comfortable environment for occupants.

Understanding Air Leakage Rates and Building Performance

When energy is lost through uncontrolled air movement, it contributes to the building’s overall emission rate. New developments must achieve specific air leakage targets to comply with Building Regulations.

For a typical residential property, the target air permeability rate is often around:

5.0m³/hr/m²

For commercial buildings, requirements are usually more demanding, with target rates commonly around:

3.0m³/hr/m² or lower

Achieving these targets requires careful consideration of the building’s air barrier from the early design stage through to construction completion.

The Risks of Poor Airtightness

Air leakage affects buildings throughout the year.

Where air enters a building through uncontrolled gaps (infiltration), air usually escapes elsewhere (exfiltration). These unwanted air movements can create a number of problems:

Increased Energy Costs

Air leaking from a building envelope causes additional energy demand because replacement air must be heated or cooled. Air Tightness Testing helps identify leakage rates, allowing designers and building owners to better understand energy performance and optimise heating and cooling systems.

Condensation, Damp and Mould Problems

In winter, warm moist indoor air can escape through gaps in the building fabric and enter colder areas such as wall cavities and roof spaces. This can lead to condensation, mould growth and, over time, timber decay or structural damage.

Reduced Occupant Comfort

Draughts can significantly affect the comfort of people using a building. Cold air entering offices, homes or commercial spaces can create uncomfortable conditions and reduce occupant satisfaction.

APT Sound Testing has investigated buildings where excessive air leakage caused serious workplace comfort issues. In one case, a building recorded an air leakage rate of 25m³/hr/m². After leakage paths were identified and remedial works completed, the building achieved a result below 5m³/hr/m², significantly improving performance.

Increased Risk of External Pollutants Entering Buildings

Uncontrolled air leakage can also allow pollutants from outside to enter a building, including emissions from nearby roads, fuel stations, waste areas, restaurants and other external sources.

A well-designed and properly installed air barrier helps control airflow, improve indoor air quality and reduce the risk of unwanted pollutants entering occupied spaces.

How Does Air Tightness Testing Work?

Air Tightness Testing is commonly carried out using a blower door test.

During the test, specialist equipment measures:

The amount of air moving into or out of the building
The pressure difference across the building envelope
The overall air leakage rate

Where leakage is detected, our engineers can use techniques such as smoke testing to accurately locate air leakage paths.

Many buildings do not fail because of one obvious opening; instead, the main issues are often caused by multiple smaller gaps throughout the construction. Identifying these areas early allows corrective action to be taken before final compliance testing.

Air Tightness Consultancy and Design Support

APT Sound Testing provides expert air tightness consultancy from the earliest design stages through to final completion testing.

Our team works with architects, developers, contractors and building professionals to help:

Review building designs and air barrier strategies
Identify potential leakage risks
Provide guidance during construction
Reduce the likelihood of failed air tests
Achieve Building Control approval

As air tightness targets continue to become more demanding, early consideration of the building’s air leakage line is essential.

By working with us throughout the design and construction process, we can help ensure that airtightness requirements are achieved efficiently and cost-effectively.

Combined Air and Sound Testing Packages

Many of our clients choose our combined testing packages because our engineers are accredited to carry out both Air Tightness and Sound Testing.

Our multi-skilled team allows multiple compliance tests to be completed during one coordinated visit, providing:

Reduced project costs
Improved site scheduling
Less disruption for contractors
Faster completion of compliance requirements

We can also provide out-of-hours testing, including weekend appointments, to minimise disruption to working sites and occupied buildings.

Preparing for Your Air Tightness Test

To achieve a successful result, preparation is essential.

We recommend that developers and contractors consider airtightness requirements early and ensure that all elements of the air barrier are correctly installed before testing.

Our team can provide advice and guidance throughout your project, and we offer an air tightness checklist to help you prepare for your test.

Why Choose APT Sound Testing?

APT Sound Testing has extensive experience delivering successful air tightness tests across London and throughout the UK.

Our team understands the requirements of Approved Document L and has completed thousands of tests across a wide range of residential and commercial developments.

With expert advice, UKAS accreditation and a commitment to quality, we help clients achieve compliance while improving the energy efficiency and performance of their buildings.

Contact APT Sound Testing

If you need professional Air Tightness Testing, consultancy or compliance support, our experienced team is ready to help.

📞 01525 303905
📧 info@aptsoundtesting.co.uk

Contact APT Sound Testing today to discuss your project requirements and discover how our specialist air testing services can help you achieve compliance and improve building performance.

Thermal Imaging: Essential for Modern Data Centres

By admin | July 3, 2026 | Comments 0 Comment

Why Thermal Imaging Is Essential for Modern Data Centres

In a world where data centres are the backbone of business operations, organisations increasingly rely on ever-increasing computing power; server rack densities continue to rise, placing greater demands on electrical infrastructure and cooling systems. The result is higher energy consumption, increased maintenance requirements, and a greater risk of equipment failure.

Many facilities managers are also unaware that failing to carry out regular electrical thermal imaging inspections of critical assets could affect their building insurance. Some insurers require evidence of routine thermographic inspections as part of a proactive maintenance programme, particularly for high-risk electrical installations. If a fire or major electrical failure occurs, the absence of these inspections may impact an insurance claim.

Thermal imaging has evolved from being a specialist diagnostic tool into an essential part of modern data centre maintenance. By identifying hidden heat-related issues before they become costly failures, infrared thermography helps improve reliability, maximise uptime, and support energy-efficient operations.

Complete Visibility of Data Centre Heat Patterns

Unlike traditional temperature sensors, which only monitor individual points, thermal imaging provides a complete visual map of temperatures across an entire facility. Engineers can instantly assess the thermal condition of server racks, electrical distribution boards, UPS systems, switchgear, cooling equipment, and cable connections.

This comprehensive view makes it possible to identify developing hotspots long before they trigger alarms or lead to equipment failure. A blocked air vent, overloaded circuit, loose electrical connection or failing cooling fan can all generate abnormal heat that would otherwise remain undetected.

Early identification enables maintenance teams to resolve issues before they affect critical operations.

Preventing Costly Downtime

Heat is one of the biggest threats to data centre reliability.

Even relatively small increases in operating temperature can accelerate component wear, shorten equipment lifespan and reduce overall performance. In more serious cases, overheating can cause servers to throttle performance, shut down unexpectedly or suffer catastrophic hardware failure.

For organisations that depend on continuous availability, unplanned downtime can result in significant financial losses, reputational damage and disruption to critical services.

Routine thermal imaging inspections allow potential failures to be identified at an early stage, enabling corrective action before problems escalate into costly outages.

Supporting Predictive Maintenance

Thermal imaging is a key component of an effective predictive maintenance strategy.

By carrying out regular inspections and comparing thermal images over time, maintenance teams can monitor temperature trends and identify gradual deterioration before equipment fails.

This proactive approach helps organisations to:

Schedule repairs before failures occur
Reduce emergency call-outs
Extend the lifespan of critical electrical assets
Improve operational reliability
Minimise business disruption

Rather than reacting to failures, facilities teams can plan maintenance activities around operational requirements, reducing both costs and risk.

Improving Cooling Efficiency and Reducing Energy Costs

Cooling systems account for a significant proportion of a data centre’s energy consumption.

Thermal imaging helps operators optimise cooling performance by identifying:

Hotspots within server racks
Over-cooled areas wasting energy
Airflow imbalances
Recirculation zones
Inefficient cooling distribution

Addressing these issues not only reduces energy consumption but also improves Power Usage Effectiveness (PUE), lowers operating costs and supports sustainability objectives.

From Reactive Maintenance to Proactive Asset Management

The real value of thermal imaging lies in its ability to transform maintenance strategies.

Instead of waiting for alarms, equipment failures or unexpected outages, operators gain continuous insight into the thermal condition of their critical infrastructure. This enables informed decision-making, reduces operational risk and helps maintain maximum system availability.

As demand for computing power continues to grow, thermal imaging is no longer simply a troubleshooting tool—it has become a strategic asset for improving resilience, reliability and long-term operational performance across the entire data centre.

Why Choose APT for Data Centre Thermal Imaging?

At APT, every thermal imaging survey follows a structured process designed to deliver accurate, consistent and actionable results.

We begin with a detailed consultation to understand your facility, operational priorities and critical assets. A pre-survey site assessment enables us to identify potential access requirements, optimise inspection routes and ensure maximum survey efficiency.

Our data centre thermal imaging inspections include:

ITC-trained Level 3 Thermographer
High-resolution FLIR T-Series thermal imaging cameras (640 × 480)
100% thermal coverage of all accessible electrical assets
Detailed fault analysis with infrared and digital images
Thermal indexing calculations where applicable
Root cause analysis and practical remedial recommendations
Asset inventory and equipment elevation references
Comprehensive electronic report delivered within 24 hours

Our reports are designed to help facilities managers prioritise maintenance, reduce operational risk and demonstrate compliance with insurer and maintenance requirements.

Contact APT

If you’d like to learn more about our specialist thermal imaging services for data centres, we’d be happy to help.

📞 01525 303905
📧 info@aptsoundtesting.co.uk

Contact APT today to discuss your data centre thermal imaging requirements and discover how proactive thermographic inspections can help protect your critical infrastructure.

BS 8233 Planning Noise Surveys

By admin | June 29, 2026 | Comments 0 Comment

BS 8233 Planning Noise Surveys & Your Building Project

If you’re developing a new residential scheme, converting an existing building, or refurbishing a property, achieving compliance with BS 8233:2014 is often a key part of securing planning approval and creating comfortable living environments.

BS 8233 provides practical guidance on controlling noise in and around buildings. It helps architects, developers, planners, and acoustic consultants design buildings that achieve appropriate internal noise levels while minimising the impact of external noise sources.

In this guide, we’ll explain what BS 8233 covers, why planning authorities require noise assessments, and how APT Sound Testing can help you achieve compliance.

What is BS 8233?

BS 8233:2014 – Guidance on Sound Insulation and Noise Reduction for Buildings provides recommendations for acoustic design in residential and other noise-sensitive developments.

The standard covers:

External environmental noise entering buildings
Internal sound insulation between rooms and dwellings
Building services noise
General acoustic design principles

As the standard states:

“Noise control in and around buildings is discussed on an objective and quantifiable basis.”

This ensures that acoustic design is based on measurable performance rather than subjective opinion.

Which Projects Require BS 8233 Assessments?

BS 8233 is commonly applied to:

New residential developments
Apartment blocks
Housing estates
Refurbishment projects
Office-to-residential conversions
Change-of-use developments
Mixed-use schemes

The standard does not generally apply to specialist spaces such as cinemas, theatres, concert halls or auditoria, which require more specific acoustic guidance.

The BS 8233 Design Process

Successful acoustic design starts early in the planning process. BS 8233 recommends a structured six-stage approach:

Site noise assessment
Setting internal noise criteria
Façade and ventilation design
Internal sound insulation
Noise mitigation measures
Quality control and verification

By considering noise at the design stage, costly redesigns and planning delays can often be avoided.

At APT Sound Testing, we support clients throughout the entire process—from initial site surveys through to acoustic design advice and final sound testing.

External Noise Assessments

One of the primary requirements of BS 8233 is assessing environmental noise affecting a proposed development.

Typical noise sources include:

Road traffic
Railways
Aircraft
Industrial operations
Construction activity
Wind farms

An acoustic consultant will measure existing noise levels and determine whether mitigation measures such as enhanced glazing, acoustic ventilation or building layout changes are required.

BS 8233 also notes that façade reflections can typically increase measured noise levels by 1–2 dB, which should be considered during the design process.

Recommended Internal Noise Levels

The standard provides target internal noise levels designed to promote comfort and restful living.

Recommended daytime and night-time noise levels include:

Room	Recommended Internal Noise Level
Living rooms	35 dB LAeq
Bedrooms	30 dB LAeq
Dining rooms	40 dB LAeq

These criteria form the basis of most planning noise assessments carried out across the UK.

Internal Sound Insulation

BS 8233 also highlights the importance of controlling noise transmission within buildings.

Good acoustic performance depends on:

Airborne sound insulation
Impact sound insulation
Controlling flanking transmission
High-quality construction and workmanship

As the standard explains:

“Flanking transmission can significantly reduce the overall sound insulation performance.”

This is why careful detailing and quality installation are just as important as selecting the correct building materials.

APT Sound Testing provides pre-completion sound testing and acoustic design advice to help developers achieve compliance with Approved Document E.

Building Services Noise

Mechanical and electrical services can significantly affect occupant comfort if not properly designed.

BS 8233 includes guidance for controlling noise from:

Ventilation systems
Air-conditioning units
Pumps
Boilers
Lifts
Plant equipment

Well-designed building services reduce the risk of future noise complaints and help ensure planning conditions are satisfied.

Why Choose APT Sound Testing?

With more than 22 years of specialist acoustic experience, APT Sound Testing provides practical, reliable advice for developments of every size.

Our services include:

BS 8233 residential noise assessments
BS 4142 industrial noise surveys
Environmental noise surveys
Acoustic design advice
Pre-completion sound insulation testing
Building services noise assessments
Part E compliance testing

Why clients choose us:

UKAS-accredited acoustic consultancy
Over 22 years of experience
Nationwide coverage
Fast turnaround times
Detailed, practical reporting
Contractor-friendly acoustic advice

About APT Sound Testing

APT Sound Testing is a UKAS-accredited acoustic consultancy specialising in residential, commercial and industrial acoustics throughout the UK.

We provide:

BS 8233 Residential Noise Assessments
BS 4142 Industrial Noise Surveys
Environmental Noise Assessments
Sound Insulation Testing
Acoustic Design Services
Part E Compliance Testing

Using the latest UKAS-calibrated Norsonic Class 1 sound level meters, our experienced consultants deliver accurate, fully compliant acoustic assessments that satisfy planning authorities, building control officers and developers alike.

Whether you’re working on a single dwelling or a large residential development, we provide practical advice that helps projects progress smoothly from planning through to completion.

Contact APT Sound Testing

If you require a BS 8233 planning noise survey, acoustic design advice or sound insulation testing, our experienced team is here to help.

APT Sound Testing

Telephone: 01525 303905 / 07775 623464

Email: info@aptsoundtesting.co.uk

Website: https://aptsoundtesting.co.uk

BS8233 Noise Assessments: A Technical Guide

By admin | June 24, 2026 | Comments 0 Comment

BS8233 Noise Assessments – A Complete Technical Guide for Planning & Building Compliance

Introduction to BS8233

BS 8233:2014 is one of the most widely used acoustic standards in UK planning and building design. It provides detailed guidance on noise control in and around buildings, including external noise intrusion, internal sound insulation, building services noise and general acoustic design principles. For any development located near transport routes, commercial premises or industrial activity, a BS8233 noise assessment is typically required by the local planning authority.

The standard emphasises that noise control should be approached on an objective and quantifiable basis, stating:

“Noise control in and around buildings is discussed… on an objective and quantifiable basis as far as is currently possible.”(BS8233:2014, Introduction)

This article provides a complete technical breakdown of BS8233 noise assessments, how they are carried out, what they must include, and how APT Sound Testing ensures full compliance for planning and building control.

2. What Is a BS8233 Noise Assessment?

A BS8233 noise assessment evaluates external noise levels at a development site and determines the acoustic measures required to achieve the recommended internal noise criteria set out in BS 8233:2014. These criteria apply to:

Living rooms
Bedrooms
Dining rooms
Home offices
Hotel rooms
Healthcare spaces
Education buildings

The standard provides recommended internal noise levels for dwellings (Table 4), including:

Living rooms: 35 dB LAeq,16hr
Bedrooms: 30 dB LAeq,8hr
Dining rooms: 40 dB LAeq,16hr

These values form the backbone of most planning conditions relating to noise.

For a deeper dive, see BS8233 noise assessments.

3. When Is a BS8233 Noise Assessment Required?

Local authorities typically request a BS8233 noise assessment when:

A development is near a busy road
The site is close to a railway line
Aircraft noise is present
There are industrial or commercial noise sources nearby
A change of use introduces noise‑sensitive rooms
A planning condition explicitly requires a BS8233 noise report

APT provides nationwide noise surveys:https://aptsoundtesting.co.uk/noise-surveys/

4. The Structure of BS 8233:2014

BS 8233 is divided into several key sections relevant to noise assessments:

Clause 5: Planning and design
Clause 6: External noise sources
Clause 7: Indoor ambient noise criteria
Clause 8: Sound insulation in buildings
Clause 9: Noise from building services
Annexes A–H: Calculations, NR curves, insulation indices, legislative context, worked examples

The standard is intended for use by non‑specialist designers, but in practice, most assessments require an experienced acoustic consultant due to the technical modelling involved.

5. What a BS8233 Noise Assessment Includes

A compliant BS8233 noise assessment typically contains the following components:

5.1 Baseline Noise Survey

A detailed noise survey is carried out at the development site, usually over a 24‑hour period. Measurements include:

LAeq,T
LAmax
LA10 / LA90
Diurnal variations
Façade vs free‑field corrections

BS 8233 notes: “Facade level measurements… are typically 1 dB to 2 dB higher than corresponding free‑field measurements.”
(BS8233:2014, 3.1.10)

This correction is essential when designing façade performance.

5.2 Façade Noise Modelling

Using measured data, we calculate the required performance of:

External walls
Glazing systems
Ventilation strategy
Building orientation
Acoustic trickle vents or MVHR systems

This modelling ensures internal noise levels meet BS8233 criteria with windows closed, as required by planning authorities.

APT’s façade and ventilation design service: https://aptsoundtesting.co.uk/acoustic-design-service/

5.3 Ventilation Strategy Review

BS 8233 requires internal noise levels to be met without relying on open windows. Therefore, the ventilation system must provide:

Background ventilation
Overheating mitigation
Compliance with Approved Document F
Acceptable internal noise levels

This is often the most challenging part of the assessment, especially on noisy sites.

5.4 Internal Layout Review

We assess room placement to minimise noise exposure:

Bedrooms placed away from noise sources
Non‑habitable rooms used as acoustic buffers
Optimised building massing
Courtyard layouts to reduce façade exposure

This aligns with BS8233 Clause 5.2 on assessing the building or site.

5.5 Compliance Statement

The final report confirms whether the development meets BS8233 criteria and details any required mitigation, such as:

Enhanced glazing
Acoustic vents
Mechanical ventilation
Acoustic barriers
Upgraded façade construction

APT specialises in designing cost‑effective, buildable solutions that satisfy planning without unnecessary overspecification.

6. External Noise Sources (Clause 6)

BS 8233 provides guidance on assessing noise from:

Road traffic
Aircraft
Railways
Industrial sources
Construction sites
Wind farms

It also highlights the importance of meteorological effects, façade reflections, and free‑field corrections.

APT’s external noise surveys: https://aptsoundtesting.co.uk/noise-surveys/

7. Indoor Ambient Noise Criteria (Clause 7)

BS 8233 provides recommended internal noise levels for:

Dwellings
Offices
Schools
Healthcare
Hotels
Commercial spaces

These values are used to determine the required façade performance and ventilation strategy.

APT’s BS8233 service page: https://aptsoundtesting.co.uk/noise-surveys/bs8233-noise-assessments/

8. Sound Insulation & Flanking (Clause 8)

BS 8233 discusses:

Airborne sound insulation
Impact sound insulation
Flanking transmission
Sound insulation testing
Performance of common building elements

It reinforces the importance of flanking control:

“Flanking transmission can significantly reduce the overall sound insulation performance.” (BS8233:2014, 8.2)

APT provides full acoustic detailing and Part E sound testing:
https://aptsoundtesting.co.uk/sound-testing/

9. Noise from Building Services (Clause 9)

BS 8233 covers noise from:

Mechanical ventilation
Air‑conditioning
Pumps
Lifts
Boilers
Ductwork noise
Fan noise
Vibration‑induced noise

Good design and installation are essential to avoid noise complaints.

APT provides building services noise assessments: https://aptsoundtesting.co.uk/noise-surveys/

10. Why BS8233 Noise Assessments Matter

A BS8233 noise assessment ensures:

Planning approval is achieved
Residents experience acceptable internal noise levels
Complaints and future disputes are avoided
The development complies with national guidance
Façade and ventilation systems are correctly specified
Internal layouts are optimised for acoustic comfort

APT integrates BS8233 into all noise surveys, acoustic design reports and sound insulation strategies.

11. Why Choose APT Sound Testing?

UKAS‑accredited company
22+ years’ experience
Nationwide coverage
Fast reporting
Detailed acoustic design
Contractor‑friendly guidance
Full support for BS8233, BS4142, Part E, BB93 & HTM 08‑01

APT’s dedicated BS8233 page: https://aptsoundtesting.co.uk/noise-surveys/bs8233-noise-assessments/

About APT Sound Testing

APT Sound Testing is a UKAS‑accredited acoustic consultancy with over 22 years’ specialist experience in building acoustics, environmental noise assessment, BS8233 Residential Noise Assessments, BS4142 industrial noise surveys, sound insulation testing and Part E compliance. We support residential, commercial and industrial developments across the UK, providing fast, accurate and fully compliant acoustic testing and reporting.

Our team combines deep technical expertise with practical, contractor‑friendly guidance to help clients achieve full compliance with Approved Document E, BS8233, BS4142, BB93, HTM 08‑01 and wider planning and building control requirements. Whether you need pre‑completion sound testing, noise impact assessments, acoustic design advice or troubleshooting for difficult sites, we deliver reliable results with a rapid turnaround.

Contact Us Now

APT Sound Testing
T: 07775 623464
E: info@aptsoundtesting.co.uk
W: https://aptsoundtesting.co.uk

PAS 2035 Air Tightness Testing

By admin | June 19, 2026 | Comments 0 Comment

Common Air Leakage Paths: PAS 2035 Air Tightness Testing

One of the key observations from our extensive experience in air tightness testing is that the more complete a development is at the time of testing, the more likely it is to achieve a low air leakage result.

To help our clients prepare, we provide a comprehensive Air Leakage Checklist alongside every quotation. By engaging with projects throughout the retrofit process, we can offer practical advice and guidance on the most effective ways to minimise air leakage and achieve PAS 2035 Compliance first time.

Most Common Air Leakage Paths We Identify

During air tightness and smoke leakage testing, we frequently identify air leakage from:

• Poorly installed windows and doors that do not seal correctly against frames
• Missing or damaged window and door seals
• Faulty or damaged trickle vents
• Gaps at wall and skirting board junctions
• Gaps through existing floorboards on all levels
• Perimeter and internal wall-to-floor junctions
• Service penetrations for electrical, plumbing and mechanical installations
• Ceiling voids connecting to masonry cavity walls
• Eaves and roof cavity pathways
• Gaps around window sills and door reveals
• Bathroom and WC service penetrations
• Kitchen and utility service penetrations
• Gaps between dry lining systems and ceilings
• Unsealed chimneys and fireplaces
• Electrical, data and IT installations
• Loft hatches and access panels
• Ventilation penetrations through walls, roofs and ceilings
• Poorly installed extractor fans in kitchens, utilities and bathrooms

Failed an Air Tightness Test?

If your building doesn’t achieve the required result, there is no need to panic.

Our smoke leakage testing service can accurately identify the source of air leakage throughout the building envelope. We provide a detailed smoke survey report, allowing your team to carry out targeted remedial sealing works before retesting.

How We Can Help

APT Sound Testing has extensive experience supporting PAS 2035 retrofit projects and helping clients achieve compliance with Approved Document L and air tightness requirements.

As a UKAS-accredited ISO/IEC 17025 testing laboratory, we specialise in on-site air tightness testing for commercial and large-scale developments. We are also an ATTMA Level 2 registered organisation, qualified to test Large, Complex and High-Rise (LCHR) buildings, as well as phased and zonal handover projects.

Using the latest UKAS-calibrated Retrotec blower door equipment, our engineers have successfully delivered thousands of air tightness tests across the UK, including landmark developments such as Battersea Power Station and the Imperial War Museum London.

Our combination of accredited competence, technical expertise and over 20 years of industry experience ensures reliable, repeatable and fully compliant testing on every project.

📞 Need help preparing for your PAS 2035 air tightness test?

Preparing for your PAS 2035 air tightness test? Contact the APT Team on 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project and avoid costly delays or test failures.