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Why Air Tightness Testing Matters

By admin | June 11, 2025 | Comments 0 Comment

Why Air Tightness Testing Matters

In an era where energy efficiency and environmental responsibility are top priorities in the construction industry, air tightness testing has become an essential part of building compliance. Since 2006, it has been a legal requirement in England and Wales under Building Regulations Part L. But beyond legal obligations, air testing plays a crucial role in reducing energy consumption, minimising environmental impact, and improving indoor comfort.

At APT Sound Testing, we offer professional and reliable Air Tightness Testing services across the UK, working with a wide range of clients, from private homeowners and developers to large-scale commercial contractors. What sets us apart is our commitment to quality, our comprehensive services, and our status as one of the few UKAS-accredited companies able to carry out both air and sound testing under one roof.

The Importance of Air Tightness Testing

Air tightness refers to how well a building can prevent the uncontrolled flow of air through gaps and cracks in its structure. In layman’s terms, it’s about reducing draughts and unwanted ventilation that leads to energy loss. Building Regulations refer to this as “air leakage,” and the more airtight a building is, the more energy efficient it becomes.

If a building isn’t airtight, heated or cooled air can escape, making heating and cooling systems work harder. This not only increases energy bills but also contributes to higher carbon emissions. In response, regulations now require new developments to meet specific air permeability rates, usually around 5.0 m³/hr/m² for residential dwellings. Commercial properties often face even stricter standards, with targets as low as 3.0 m³/hr/m².

But airtightness isn’t just about energy efficiency. It also affects the long-term health of a building. For example, in colder months, moist indoor air can escape into the walls and cause condensation within cavities. This can lead to mould, damp, and even structural rot, all of which are expensive and disruptive to fix.

Comprehensive Testing Packages

APT Sound Testing is uniquely positioned to help developers meet their compliance goals efficiently and cost-effectively. We provide combined Air, Sound, and Vent Testing packages, often completing all three during a single site visit. This streamlined approach not only saves money but also improves on-site coordination and reduces delays.

We believe in doing the job properly, so unlike many other providers, we never subcontract our work. Our in-house team of multi-skilled, UKAS-accredited engineers carry out all testing to the highest professional standards.

Many of our clients take advantage of our three-step pre-completion package, which includes:

Air Tightness Testing – to assess and reduce air leakage.
Sound Insulation Testing – to ensure acoustic performance between walls and floors meets regulatory standards.
Ventilation Testing – to verify that airflow systems meet design specifications and building codes.

This all-in-one solution means fewer contractors to manage, fewer appointments to schedule, and faster results.

Support from Design to Completion

Achieving air tightness begins long before the test itself. At APT Sound Testing, we provide design-stage consultancy to identify potential problem areas before construction even begins. Our experienced consultants review architectural drawings and offer expert advice on construction techniques and materials that will help your project meet its targets.

This early intervention helps avoid costly delays or retesting later on. We also conduct on-site inspections and walkthroughs to ensure the building is prepared before the final air test, significantly increasing the chance of a first-time pass.

Flexible Testing to Suit Your Schedule

We understand that construction sites are busy places, often running on tight deadlines. That’s why we offer flexible scheduling, including weekend and out-of-hours testing. This ensures your project stays on track without disrupting other critical work during normal hours.

Whether you’re managing a small residential build or a major commercial development, our goal is to make the compliance process as smooth and stress-free as possible.

Expert Advice and Friendly Service

Our clients appreciate our professional yet approachable service. We’re always happy to answer questions, explain procedures, and work closely with your site team to ensure successful outcomes.

Whether you’re new to air testing or an experienced builder looking for a reliable partner, we’re here to help. Our team of air tightness experts can provide tailored advice based on your project’s unique needs.

Get in Touch

If you need assistance with air tightness testing, or would like to explore our full suite of compliance services, contact APT Sound Testing today. Use our simple online contact form or call our offices at 01525 303905 to speak with one of our knowledgeable consultants.

We’re ready to support your project from planning through to completion with professional service, competitive pricing, and industry-leading expertise.

Thermal Imaging for Buildings

By admin | June 4, 2025 | 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 they can be quickly sealed by the FM team. 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.

Thermal Imaging for Buildings

By admin | June 3, 2025 | Comments 0 Comment

Thermal Imaging for Buildings: Improving Energy Efficiency and Safety

Thermal imaging technology is transforming the building industry by offering powerful insights into energy efficiency, safety, and maintenance. This technology uses infrared cameras to detect temperature variations within buildings, revealing hidden issues such as insulation deficiencies, moisture problems, and electrical faults. In this comprehensive guide, we will explore the benefits, applications, and advancements in thermal imaging surveys for buildings, and how it can significantly enhance building performance and safety.

What is Thermal Imaging?

Thermal imaging, also known as thermography, is a technique that captures infrared radiation emitted by objects. Unlike visible light, infrared radiation is invisible to the human eye but can be detected by thermal cameras. These cameras convert infrared radiation into an image that displays temperature variations, with different colors representing different temperatures. This allows for the identification of thermal anomalies that could indicate potential problems within a building.

The Importance of Thermal Imaging surveys for Buildings

1. Improve Energy Efficiency

One of the primary applications of thermal imaging in buildings is to improve energy efficiency. By identifying areas of heat loss, such as poor insulation or air leaks, building owners can take corrective actions to reduce energy consumption and lower utility bills. Proper insulation and sealing of air leaks can also improve indoor comfort and reduce the building’s carbon footprint.

2. Improve Preventive Maintenance

Thermal imaging is an invaluable tool for preventive maintenance. Regular thermal inspections can detect potential issues before they become serious problems. For example, thermal cameras can identify overheating electrical components, which could indicate a risk of fire. Early detection allows for timely repairs, preventing costly damage and ensuring the safety of building occupants.

3. Identify Moisture Detection

Moisture intrusion can cause significant damage to a building’s structure and lead to mold growth, which poses health risks to occupants. Thermal imaging can identify areas of moisture buildup that are not visible to the naked eye. By pinpointing these areas, building owners can address the source of moisture and prevent further damage.

4. Enhanced Building Assessments

Thermal imaging provides valuable data for building assessments, including pre-purchase inspections, energy audits, and facility management. It offers a non-invasive and efficient method to evaluate the condition of a building’s structure and systems. This information can be used to make informed decisions about repairs, upgrades, and maintenance.

Applications of Thermal Imaging for Different Buildings

Residential Buildings

In residential buildings, thermal imaging is used to identify insulation deficiencies, air leaks, and moisture problems. Homeowners can use thermal images to prioritise home improvement projects, ensuring that their homes are energy-efficient and safe. Thermal inspections can also be part of regular home maintenance, providing peace of mind and protecting the value of the property.

Commercial Buildings

Thermal imaging plays a crucial role in maintaining the performance and safety of commercial buildings. It is used to inspect HVAC systems, electrical panels, and roofing systems. By identifying potential issues early, building managers can schedule maintenance and repairs to minimise disruptions and extend the lifespan of building systems.

Industrial Facilities

In industrial facilities, thermal imaging is used to monitor critical equipment and machinery. It helps in detecting overheating components, insulation failures, and other issues that could lead to equipment failure or downtime. Thermal inspections contribute to the overall efficiency and safety of industrial operations.

Advancements in Thermal Imaging Technology

Thermal imaging technology has advanced significantly in recent years, making it more accessible and effective for building applications. Some of the key advancements include:

High-Resolution Thermal Cameras

Modern thermal cameras offer high-resolution imaging, providing detailed and accurate temperature data. This allows for precise identification of thermal anomalies and improves the overall quality of thermal inspections.

Integration with Drones

The integration of thermal cameras with drones has revolutionised the way thermal inspections are conducted. Drones equipped with thermal cameras can quickly and safely inspect large areas, such as building exteriors and roofs, without the need for scaffolding or ladders. This increases the efficiency and safety of thermal inspections.

AI and Machine Learning

Artificial intelligence (AI) and machine learning are being integrated into thermal imaging systems to enhance data analysis. These technologies can automatically identify patterns and anomalies in thermal images, providing faster and more accurate diagnostics. AI-powered thermal imaging systems can also predict potential issues based on historical data, enabling proactive maintenance.

How to Implement your Thermal Imaging for your Building Inspection

Implementing a robust thermal imaging inspection for you building, involves several steps:

1. Selection a company with the correct Training and Certification

Selecting a company that has the proper training is essential for effective thermal imaging survey. Certification demonstrates the company’s expertise and will ensure the reportage is of the highest quality.

2. Good quality Thermal Cameras are essential

Check that your nominated company, uses the highest quality thermal camera that meets your needs based on resolution, sensitivity, and other features. Consider factors such as the size of the building, the type of inspections you will conduct. A minimum specification should be a 640 x 480 resolution.

2. Training and Certification

Choosing a thermal imaging company with proper training is essential for effective thermal imaging. Our engineers are trained to Level 3 which is the highest in the industry. Level 3 certification demonstrates the company’s expertise and knowledge in the thermal imaging field.

3. Conducting Comprehensive Inspections

We plan our thermal imaging inspections to cover all critical areas of the building. We capture thermal images of insulation, windows, doors, electrical panels, HVAC systems, and other components. We carefully document our findings and compare thermal images over time to track changes and identify emerging issues via our trend analysis software.

4. Analysing and Reporting

We carefully analyse the thermal images to identify anomalies and determine their cause. We create detailed reports that include thermal images, descriptions of the issues, and recommendations for corrective actions. We then use the reports to communicate our findings to building owners and stakeholders.

Conclusion

Thermal imaging is a powerful tool that offers numerous benefits for building inspections, including improved energy efficiency, preventive maintenance, and moisture detection; however, it’s always best to have it undertaken by an experienced company using the correct equipment. By implementing thermal imaging in building inspections, building owners and managers can ensure the safety, performance, and longevity of their properties.

Contact us now

For more information our thermal imaging services, please contact APT Sound Testing on 07775 623464 or email us at info@aptsoundtesting.co.uk

# About the Author

Darren Helliwell is a building performance specialist with over 25 years of hands-on experience leveraging thermal imaging, blower door testing, and smoke analysis to optimise air tightness in both new-build and refurbishment projects such as Battersea Power Station, Imperial War Museum and Harrods.

Using advanced infrared thermal imaging cameras alongside state-of-the-art blower door and smoke-testing equipment, Darren’s team delivers detailed thermographic surveys across residential and commercial buildings. These thermal imaging surveys pinpoint invisible air leaks, identify insulation defects, and reveal thermal bridging—empowering architects, contractors, and property owners to make targeted, energy-saving improvements.

Darren’s ongoing mission is to help design teams and contractors harness the power of thermal imaging to achieve truly airtight, energy-efficient building envelopes. By reducing heat loss and driving down energy bills, his thermography expertise supports sustainable, cost-effective construction and refurbishment outcomes.

Connect with Darren Helliwell:

[Thermal Imaging Surveys] Thermal Imaging Surveys | APT Building Thermography Reports

[APT Email] info@aptsoundtesting.co.uk

[LinkedIn] https://www.linkedin.com/in/darren-helliwell-78789b26

Sound Insulation Testing – Q&A

By admin | June 1, 2025 | Comments 0 Comment

Sound Insulation Testing – Questions & Answers

APT sound testing often get asked a similar bunch of questions in regards to sound insulation testing. Over the last couple of years we have collated these questions and answers and to help our valued clients we have shown these below.

What is sound testing for Part E
Sound Insulation Testing is a method of quantifying the sound insulation performance of walls and/or floors. Sound testing can be carried out on party walls, party floors or facades of any building.

What is sound insulation?
Sound insulation is the property of a wall and /or dividing partition to resist the passage of noise.

Why do I need sound testing on my Project/Property?
The largest single reason for disputes between neighbours is noise complaints. Approved Document Part E – Resistance to the passage of sound describes minimum standards to be achieved by newly built domestic dwellings.

What building regulation do we work to?

Approved Document Part E, sets out minimum standards for sound insulation performance to be achieved by party wall and party floors. Building contractors may show compliance with Part E of the Building Regulations by two methods. One method is to register plots to be built with Robust Standard Details Limited and the other is to show as-built performance by Pre-Completion Sound Testing to Part E of Building Regulations.

When are Pre-Completion Sound Tests carried out?
Pre completion Sound testing is carried out when the construction of party walls and floors are largely complete. Windows should be in place with any vents closable. Internal and external doors should be in place, along with skirting, cornicing and plug sockets in place. Sound testing on floors must be carried out before any soft coverings are in place.

Do detached properties require sound testing for Part E of Building Regulations?

No, only attached properties require sound tests, detached properties share no common partitions with any other properties.

Are internal walls/floor between rooms within a single dwelling sound tested?
No, Laboratory test based performance standards (Rw) exist for certain internal walls and floors, but they are not intended to be verified as-built by on site measurement and therefore sound insulation testing is not a requirement.

How many sound tests are needed on my Project?

Approved Document E states that one set of sound tests is required for every 10 units in a group or sub-group. A group or sub-group is defined where significant differences in construction or layout occur, for instance:

For a pair of semi-detached Houses – a set of tests would usually comprise two airborne sound insulation tests of a separating wall.
For Flats (up to 10 units) – a six pack would normally be required, this comprises of: two airborne wall tests, two airborne floor tests and two impact floor sound tests. The easiest way to work out the number of tests required is to multiply 1 x 6 packs for every 10 flats, i.e. if you have 22 flats you will require 3 x 6 packs which equals 18 sound tests in total.
For Rooms for Residential Purposes (student accommodation, hotel rooms, care homes etc.) – a set of tests would usually comprise: one airborne sound insulation tests of a separating wall; one airborne sound insulation test of a separating floor; one impact sound transmission test of a separating floor.

How are plots selected for Sound Insulation Testing?
We will usually specify the sound insulation tests that are required. We first look at the plans then work a testing schedule taking into account testing through both the projects lounges & bedrooms where possible. We will also try and undertake testing across walls and floors in different areas of the building.

The building control officer, warranty provider or other concerned parties may require you to carry out sound testing in specific areas or plots. However where this has not been stipulated we can advise accordingly. When we have specified the sound testing schedule it should always be checked by building control and/or the client to seek their approval before the commencement of testing.

How do I Preparing my Site for Sound Insulation Testing?

APT always send out a checklist with our fee proposals to help you prepare for the sound testing, as we always want our clients to be fully prepared so they can pass their sound testing at the first attempt.

Will the sound insulation testing disrupt work on site?
There should be minimal site disruption during the sound insulation testing. However, although high levels of noise are generated but in order to make accurate test measurements, relatively quiet conditions are needed to take accurate measurements. This means that anyone working in the testing area will have to leave temporarily and any noisy works in the vicinity of the test rooms will need to be halted i.e. using power tools.

How long will the Sound Insulation Testing take?

The time taken for London sound testing varies with site conditions, but generally a ‘6 pack’ set of tests on houses and flats takes about one to two hours. Obviously this depends on the site being fully prepared in line with our sound testing checklist.

How do I know if I’m ready for a sound insulation test?
The plots should be at least at second fix stage – for further details please refer to our checklist.

Do I need all internal and external doors and windows installed?
Yes, all internal and external doors must be fitted and operable prior to the sound testing. Trickle vents must also be installed where required.

What if I only have 110 volt on site?

Unfortunately we cannot undertake the testing; we will need 240V to undertake the sound insulation testing.

Should I inform my neighbours of the impending sound testing?
If the building is attached in any way to occupied properties then you will need to inform the neighbours. To comply with Part E we need to gain access to the neighbouring properties to undertake the sound test. You will need to ensure that access is provided to the neighbouring properties throughout the sound testing.

Can you offer advice to help me to pass my sound insulation testing?
We offer an acoustic design service to help you design your buildings partitions to pass Part E sound testing. If you send through the relevant drawings such as sections and plans during the design stages of the project, we can check the design to see if there are any junctions or details where ‘noise flanking’ may occur. You can then change your design to lower the chance of a sound test failure.

Do you have a check-list to help us prepare for the sound testing?
Yes, we have an informative checklist to help prepare for the testing, please visit our website at www.aptsoundtesting.co.uk to download the checklist.

Is it easy to upgrade the sound insulation in my Existing Home?.

Yes of course. If excess noise is causing you stress and anxiety, in comparison upgrading the walls/floors to your existing property can be a worthwhile process. its normally quite easy to upgrade walls and floors/ceilings to lower sound transmission. Sometimes it can be as easy as installing an acoustically (insulated) backed board against the offending partition. In all instances it is important not only that the right products are used to cause minimal disruption but they are also fitted correctly in-line with manufacturer’s guidelines. .

Rest Assured

We believe in working with our clients whether they are existing home owners suffering acoustic problems or large developers requiring a more expansive service to achieve sound testing compliance. We believe that by being involved at the beginning of a project we can often save our clients expensive and difficult remedial works at the completion stage of a project.

If you would like more information on our full range of services, including Sound Insulation Testing, please contact us now at info@aptsoundtesting.co.uk or call us on 01525 303905.

Planning Noise Surveys & APT

By admin | May 30, 2025 | Comments 0 Comment

Planning Noise Surveys & Assessments

Professional BS8233 and BS4142 Noise Assessments by APT Sound Testing

At APT Sound Testing, we specialise in providing expert planning noise surveys to support planning applications for all types of developments, from small residential builds to large commercial or industrial sites. With extensive experience in BS8233 Noise Assessments and BS4142 Industrial Noise Assessments, we help ensure your project meets the acoustic requirements of local planning authorities.

BS8233 Noise Surveys – Residential Noise Assessments

If you’re developing new homes, apartments, or hotels, your local planning authority may request a BS8233 Noise Assessment as part of your planning conditions. This survey helps determine the impact of external noise sources, such as roads, railways, entertainment venues, or nearby industrial activities, on the proposed development.

Why BS8233 Noise Assessments Are Required:

To assess the suitability of the site for residential use.
To design effective noise mitigation strategies.
To meet the National Planning Policy Framework (NPPF) guidelines for protecting future occupants from noise exposure.

We’ve conducted hundreds of successful noise surveys for residential schemes across the UK, working with architects, planning consultants, developers, and homeowners. Our goal is always to recommend practical and cost-effective acoustic solutions that can be implemented early in the design stage, avoiding costly retrofits later on.

Need a BS8233 Noise Survey for your project?
📞 Call us today on 01525 303905 or 📧 email info@aptsoundtesting.co.uk
🔗 Learn more about BS8233 Noise Surveys

BS4142 Noise Surveys – Industrial and Commercial Noise Assessments

Planning authorities increasingly require BS4142 Noise Assessments for developments that introduce new noise sources, such as industrial plant, extraction systems, or air conditioning units, especially where these developments are near existing housing.

At APT Sound Testing, we offer comprehensive BS4142 surveys to assess and mitigate the impact of industrial noise on nearby residential areas.

Our BS4142 Services Include:

24-hour monitoring of existing background noise levels (LA90).
Prediction or measurement of noise from proposed or existing sources.
Detailed reporting with mitigation recommendations and noise mapping.
Expert support for planning applications and compliance monitoring.

These assessments are crucial for mixed-use developments, especially when residential properties are situated close to operational industrial or commercial units. Our experienced consultants use the latest equipment and methodologies to deliver accurate, actionable results.

Need a BS4142 Noise Assessment for your development?
📞 Call us now on 01525 303905 or 📧 email info@aptsoundtesting.co.uk

Why Choose APT Sound Testing?

Over a decade of experience in noise surveys and acoustic consultancy
Nationwide coverage with fast turnaround times
Clear, jargon-free reporting tailored to your planning needs
Proven track record of successful planning outcomes

Don’t let noise compliance delay your planning application. Partner with APT Sound Testing to get expert support and peace of mind from start to finish.

# About the Author

Connect with Darren Helliwell:

[Thermal Imaging Surveys] Thermal Imaging Surveys | APT Building Thermography Reports

[APT Email] info@aptsoundtesting.co.uk

[LinkedIn] https://www.linkedin.com/in/darren-helliwell-78789b26

Plant Noise Surveys: Ensuring Compliance

By admin | May 20, 2025 | Comments 0 Comment

Plant Noise Surveys: Ensuring Compliance & Peace of Mind

Have you received a planning condition requiring a plant noise survey in line with BS4142? At APT Sound Testing, we specialise in providing expert noise assessments tailored to meet regulatory requirements and protect residential amenity.

Noise from industrial and commercial plant is an increasing concern for planning authorities. With the government’s continued focus on redeveloping brownfield sites, residential and industrial zones are becoming more closely intertwined. This proximity often leads to challenges around noise pollution, particularly where plant equipment operates around the clock. As a result, managing industrial noise levels has become a critical aspect of gaining planning approval and safeguarding community wellbeing.

At APT Sound Testing, we provide fully compliant BS4142 industrial noise surveys, helping clients meet local authority demands and maintain good relations with neighbouring residents.

Importance of Plant Noise Surveys

A plant noise survey assesses the sound emissions from industrial or commercial machinery, such as HVAC systems, extract fans, refrigeration units, and generators, against the background noise levels of the surrounding area. When these installations are near homes or noise-sensitive premises like schools or hospitals, controlling noise becomes essential.

Planning conditions often stipulate that the cumulative noise level from all fixed plant on-site must not exceed certain thresholds when measured at the site boundary or the nearest sensitive receptor. A plant noise survey provides the data required to demonstrate compliance, or highlight the need for mitigation measures.

Understanding BS4142 Noise Assessments

BS4142:2014+A1:2019 is the British Standard used to assess the impact of industrial and commercial sound on residential areas. It provides a methodology for evaluating how much a new or existing plant installation will affect nearby residents. Our assessments involve:

Baseline Monitoring: Measuring the existing background noise (typically using LA90 – the level exceeded for 90% of the time) over a 24-hour period, ensuring both day and night conditions are captured.
Plant Noise Measurement: If the plant is operational, we measure its contribution directly. If not yet installed, we predict the impact based on manufacturer data and real-world benchmarks.
Comparison & Analysis: We compare the plant noise level to the background level. The greater the difference, the higher the likelihood of adverse impact.
Character Corrections: We account for tonal or impulsive characteristics (e.g., humming, banging, or whining) which can increase the perceived annoyance of the noise.

A high-quality BS4142 report will clearly present these findings and offer evidence-based recommendations.

Why Choose APT Sound Testing for Your Plant Noise Surveys?

At APT Sound Testing, we have extensive experience delivering plant noise assessments across the UK. Whether you’re installing a new HVAC system in a mixed-use development or operating a commercial unit near a residential area, we offer:

Comprehensive Surveying: Using cutting-edge Norsonic sound level meters and data loggers, UKAS calibrated to ensure accuracy, we conduct thorough 24-hour noise monitoring.
Expert Reporting: Our detailed reports are easy to understand and planning-compliant, often including 3D noise mapping to visually demonstrate potential impacts and mitigation benefits.
Mitigation Design: Where necessary, we propose effective and cost-conscious solutions—such as acoustic enclosures, attenuators, or barriers—to ensure compliance.
Responsive Service: With a central London office and teams across the UK, we can respond quickly to urgent requests and provide last-minute testing, including out-of-hours and weekend availability.

Acoustic Testing Beyond Plant Noise

In addition to plant noise surveys, APT Sound Testing offers a full range of acoustic testing and consultancy services. We are UKAS accredited to carry out sound insulation testing in line with Approved Document E of the Building Regulations. Our work spans:

Residential Developments: Including new builds, conversions, and housing developments requiring pre-completion sound testing.
Commercial and Educational Buildings: Ensuring compliance in schools, offices, hotels, and healthcare facilities.
Design Stage Consultancy: Providing early-stage design input to reduce the risk of failure and avoid costly remedial work.

With decades of combined industry experience, our team of acoustic engineers takes a proactive approach to ensure your project stays compliant and on schedule.

Our Commitment to Quality and Customer Satisfaction

At APT Sound Testing, customer satisfaction is at the heart of everything we do. From initial contact through to final report delivery, we offer a personal, professional, and transparent service. Our high return-client rate speaks to our reliability, expertise, and attention to detail.

We understand the importance of buildability and budget constraints, which is why our consultancy always focuses on practical, real-world solutions. By continually investing in both our team and our equipment, we ensure our clients receive the highest standard of service across every project.

Whether you’re a developer, contractor, architect, or property manager, we’re here to help guide your project through its acoustic challenges and ensure it meets all regulatory requirements.

Get in Touch

If your local authority has requested a BS4142 plant noise survey, or if you’re in the early stages of design and want to get ahead of potential issues, we’d love to help.

Call us on: 01525 303905
Email: info@aptsoundtesting.co.uk
Website: www.aptsoundtesting.co.uk

Let’s work together to keep your project on track, on time, and fully compliant.

Electrical Thermal Imaging

By admin | May 12, 2025 | Comments 0 Comment

Thermal Imaging: BREEAM Compliance, Inspections & FLIR Certification

In the world of smart building management and sustainable construction, electrical thermal imaging has become a vital tool for maintaining the health and efficiency of modern infrastructure. By using infrared technology to visualise heat patterns within electrical systems, this approach allows technicians to detect potential issues early, before they become costly or dangerous.

Beyond its value in maintenance and safety, thermal imaging also plays a key role in helping buildings meet the rigorous standards of BREEAM — the Building Research Establishment Environmental Assessment Method. This widely recognized sustainability certification evaluates the environmental performance of buildings, with energy efficiency and safety being central pillars. In this guide, we’ll explore how thermal imaging supports BREEAM compliance, how inspections are conducted, and why FLIR camera certification is crucial for reliable results.

What is Electrical Thermal Imaging?

Electrical thermal imaging is the process of using infrared cameras to detect and visualize heat emitted from electrical components. Every electrical system generates some level of heat during normal operation. However, excess heat, or hot spots, often indicates problems such as:

Overloaded circuits
Loose or corroded connections
Worn-out insulation
Failing components

Thermal imaging cameras convert these invisible heat signatures into visible images called thermograms. These images display temperature variations using color gradients, allowing technicians to pinpoint abnormal conditions that could lead to equipment failure, fire hazards, or energy waste.

Why Thermal Imaging Matters for BREEAM Compliance

For architects, engineers, and building managers pursuing BREEAM certification, thermal imaging is more than a diagnostic tool — it’s a strategic asset. BREEAM emphasizes energy efficiency, sustainability, and long-term performance. Thermal imaging contributes in the following ways:

Detecting energy inefficiencies such as heat loss, poor insulation, or air leakage
Identifying underperforming electrical systems, enabling proactive repairs and upgrades
Ensuring occupant safety by spotting potential fire risks in electrical infrastructure

By addressing these issues through regular thermal inspections, buildings can align more closely with BREEAM’s benchmarks, improving their chances of earning credits and enhancing overall environmental performance.

Conducting Thermal Imaging Inspections: Step-by-Step

Carrying out an effective electrical thermal inspection involves more than pointing a camera and snapping images. It requires planning, precision, and expertise. Here’s a breakdown of the inspection process:

1. Preparation

Before any inspection begins, a clear scope must be defined. This includes identifying which systems and components will be assessed and ensuring they are operating under normal load conditions. This is critical because electrical systems need to be energized and under load to produce useful thermal patterns.

Additionally, safety measures must be in place. Inspectors should wear the appropriate personal protective equipment (PPE) and follow relevant health and safety protocols, especially when working in live environments.

2. Data Collection

Once on-site, technicians use thermal imaging cameras to scan electrical panels, distribution boards, circuit breakers, transformers, and other components. Images are taken from multiple angles and distances to ensure thorough coverage.

The camera settings, including emissivity, reflected temperature, and focus, must be properly adjusted for accurate results. Inconsistent settings can distort readings and lead to incorrect conclusions.

3. Image Analysis and Interpretation

Interpreting thermograms is where skill and experience come into play. Normal temperature variations are expected, but sudden spikes or irregular patterns may signal issues. Key signs to look for include:

Localized hot spots
Unusual temperature gradients
Components significantly hotter than their peers

Each observation must be logged and analyzed in context. For example, a hot breaker might indicate overload, but it could also be the result of ambient temperature or reflective surfaces. Technicians must rule out false positives and identify the root cause.

4. Reporting and Action

A good thermal inspection doesn’t stop with image capture. Inspectors generate a comprehensive report that includes:

Annotated thermographic images
Temperature readings
Identified faults and severity levels
Recommended corrective actions

When performed in line with BREEAM requirements, these reports also highlight how the inspection supports building sustainability goals, such as reducing energy loss or preventing future system failures.

FLIR Camera Certification: Why It Matters

FLIR Systems is one of the most trusted names in thermal imaging technology. Their cameras are widely used in industries ranging from building diagnostics to electrical engineering. However, simply owning a FLIR camera isn’t enough. Technicians must be properly trained and certified to get the most accurate results.

What is FLIR Certification?

FLIR camera certification is a formal recognition that a technician has completed specific training in the use of infrared cameras. It ensures they can:

Operate the camera correctly under various conditions
Adjust settings for different surfaces and materials
Accurately interpret thermal images
Identify real faults versus normal temperature variations

Certification Process

To achieve certification, technicians usually undergo training courses (Level 1, Level 2, etc.) that cover both theoretical and practical aspects of thermography. Topics include:

Principles of heat transfer and infrared science
Best practices for thermal image capture
Common faults in electrical systems
Reporting techniques and compliance requirements

After training, technicians must pass proficiency exams to demonstrate their skills. This process guarantees that inspections are carried out by professionals capable of delivering reliable, actionable data.

Practical Applications of Electrical Thermal Imaging

Thermal imaging has evolved beyond just electrical fault detection. Today, it’s used in a wide range of building and energy applications:

Building Diagnostics

Thermal imaging reveals more than electrical issues—it can detect:

Heat loss through windows and roofs
Moisture intrusion and leaks
HVAC inefficiencies

These insights help property managers schedule preventative maintenance and avoid costly repairs.

Energy Audits

Thermal scans are a vital part of energy assessments. By visualizing energy loss and inefficiencies, organizations can prioritize upgrades that reduce carbon footprints and utility costs, an important factor in BREEAM scoring.

Continuous Monitoring

In critical infrastructure and industrial settings, thermal cameras can be installed for ongoing system monitoring. This enables early detection of faults, enhances uptime, and supports predictive maintenance strategies.

Electrical Thermal Imaging

Electrical thermal imaging is a smart, non-invasive way to keep buildings safe, efficient, and sustainable. From identifying hidden electrical faults to supporting compliance with BREEAM standards, it plays a critical role in modern facilities management.

But the value of thermal imaging depends on the people and tools behind it. With FLIR-certified technicians and carefully planned inspections, organizations can confidently diagnose issues, optimize energy use, and uphold the highest standards of building performance.

Whether you’re managing a commercial property, planning a retrofit, or aiming for green building certification, thermal imaging should be an essential part of your strategy.

Domestic Extractor Fan Testing

By admin | May 2, 2025 | Comments 0 Comment

Domestic Extractor Fan Testing & APT

As part of the evolving UK Building Regulations, Part F (Ventilation) now mandates that all intermittent extractor fans — such as those installed in kitchens and bathrooms — must have their airflow rates tested on-site. These results must be submitted to the local Building Control Body (BCB) before the property can be signed off and handed over.

At APT Sound Testing, we specialise in helping developers, contractors, and homeowners ensure full compliance with these updated regulations. With our UKAS accreditation and expert team of consultants, we offer efficient, cost-effective extractor fan te s ting, often conducted at the same time as your air and acoustic testing, to save time and reduce project coordination challenges.

Why Extractor Fan Testing Is Now Essential

As energy efficiency standards tighten, new buildings are becoming increasingly airtight and insulated. While this is great for reducing heat loss, it also places more demand on mechanical ventilation systems to ensure good indoor air quality. Poor ventilation can lead to moisture buildup, damp, mould growth, and even health issues for occupants.

To address this, Approved Document F outlines strict requirements for Mechanical Ventilation and Heat Recovery (MVHR) systems, as well as intermittent extractor fans. These systems must be tested, commissioned, and certified before a building can be signed off.

This makes extractor fan testing not only a compliance requirement—but a crucial part of ensuring occupant comfort and well-being.

Types of Ventilation Systems Under Part F

Approved Document F defines four types of ventilation systems, known as Systems 1 to 4. Here’s a quick breakdown:

System 1: Background Ventilators + Intermittent Extract Fans

This is the most commonly used approach. Moisture and odours are extracted via fans in wet areas (e.g. kitchens, bathrooms), while fresh air is introduced through trickle vents or background ventilators in windows or walls.

System 2: Passive Stack Ventilation (PSV)

This uses natural airflow driven by wind and temperature differences. It includes roof-level outlets and background ventilators—ideal for energy-conscious homes but harder to control.

System 3: Continuous Mechanical Extract Ventilation (MEV)

MEV systems continuously remove air from wet rooms using mechanical fans, usually ducted to one central point. Fresh air enters via trickle vents.

System 4: Mechanical Ventilation with Heat Recovery (MVHR)

MVHR systems provide both supply and extract ventilation through ducts, while also recovering heat from the outgoing air. This is the most energy-efficient system but requires careful design and installation.

Not sure which system is right for your property? Contact our experienced team to talk through your project needs and compliance strategy.

Required Extract Rates for Domestic Fans

Approved Document F outlines the minimum airflow rates that each extractor fan must achieve, regardless of property size or type:

Kitchens (cooker hood or similar): 30 litres per second (l/s)
Bathrooms (intermittent fans): 15 l/s
WCs (sanitary accommodation): 6 l/s

These rates must be verified on-site using calibrated equipment. Failure to meet the required airflow levels can delay handover and lead to additional remedial costs.

When and How We Test

In most cases, our team can carry out Ventilation Flow Rate Testing during the same visit as your Air Tightness Test. This means you can achieve Part L and Part F compliance simultaneously, saving valuable time and project costs.

Our engineers are trained to work efficiently and respectfully on active construction sites, ensuring minimal disruption and rapid turnaround of test results.

Pre-Test Checklist: Preparing for Extractor Fan Testing

To ensure a smooth testing process, the following elements should be complete before we arrive on site:

Electrical supply connected to all extractor fans.
Fans must be fully installed and operational.
Surrounding finishes (e.g., plasterboard/masonry) must be sealed properly to ensure airtightness.
All windows and external doors must be installed.
Trickle vents fitted to all applicable windows.
Safe access must be available to all test points (both internal and external).
SAP calculation worksheets must be provided for each unit.
All internal doors installed.
Ventilation specifications for each fan type must be supplied.
Floor plans and sections must be submitted at least 3 working days in advance.
Occupancy schedule indicating the number of residents per unit.
Parking space provided within 50m of the building.
The building envelope must be complete—doors, windows, cladding installed.
Interior finishes complete, including switches, sockets, flooring, and ceiling surfaces.

Need help reviewing your site readiness? We’re here to guide you through the process.

Why Choose APT Sound Testing?

APT Sound Testing are a UKAS-accredited laboratory, meaning our testing and reporting meet the highest standards of accuracy and reliability under ISO certification. With years of experience in acoustic design and building compliance, we’ve worked on thousands of projects, from single dwellings to large residential developments.

Our clients return to us time and again because we offer:

Fast, efficient service
Expert consultancy
Combined testing packages (air, sound, vent)
Reliable certification for building control
Friendly, knowledgeable support

We understand that compliance isn’t just about ticking boxes, it’s about delivering healthier, more comfortable homes. That’s why we take the time to understand your project’s unique needs and offer tailored solutions every time.

Get in Touch Today

Our team is ready to help you meet your Extractor Fan Testing and ventilation compliance obligations with ease and confidence. Whether you’re planning a new build or preparing for completion, we’ll ensure your extractor fan systems are correctly tested, certified, and fully compliant with Approved Document F.

Call us today on 01525 303905 or use our contact form on our website to speak with one of our expert consultants about your project. We’re here to help you every step of the way.

Acoustic Consultancy & Testing

By admin | April 23, 2025 | Comments 0 Comment

Acoustic Consultancy & APT Sound Testing

When it comes to construction, few things impact long-term satisfaction quite like sound. Whether it’s noisy neighbours in an apartment block, echoes in a commercial space, or inadequate insulation in a converted building, poor acoustics can create lasting problems. What’s more, meeting sound insulation standards isn’t just about comfort, it’s a legal requirement under Building Regulations Part E in the UK.

At APT Sound Testing, we understand that navigating these regulations can be challenging. That’s why we offer a full turnkey acoustic consultancy and sound testing service, guiding clients from early design stages right through to final pre-completion testing and certification. With years of experience and UKAS accreditation, we deliver expertise you can trust.

In this guide, we’ll walk you through how our process works, why acoustic design matters, and how we can help ensure your project achieves compliance, efficiency, and peace of mind.

Why Is Acoustic Consultancy So Important?

In the UK, Approved Document E outlines the minimum performance standards for sound insulation between dwellings. It applies to new builds, conversions, and material change-of-use developments. Non-compliance can lead to delays, expensive remedial work, and in some cases, refusal of building control sign-off.

But good acoustic design isn’t only about meeting a checklist — it enhances quality of life, protects your investment, and demonstrates a commitment to high building standards. Unfortunately, many projects leave acoustic considerations too late in the process, only to discover performance issues during final testing.

That’s where APT Sound Testing steps in. Our consultancy ensures your project is designed and built with acoustic performance in mind, significantly reducing the risk of sound test failure and costly rework.

Our 4-Step Acoustic Design and Testing Process

We’ve developed a clear, practical process that takes the stress out of acoustic compliance. Whether you’re a developer, architect, or contractor, we support your project every step of the way.

1. Site Survey Visit

Our process begins with an on-site assessment of the existing construction. This visit allows us to evaluate the current materials and identify potential weaknesses in the structure. For example, the use of lightweight blocks or poor sealing can result in inadequate sound insulation.

During this visit, we also assess the quality of any ongoing installation. Are acoustic materials being fitted correctly? Are workmanship standards being followed? Catching issues early can prevent expensive problems later in the build.

2. Sample Sound Insulation Testing

Before we propose any acoustic design changes, we carry out sample sound testing on the existing walls and floors. These tests provide an accurate picture of the current sound insulation levels and allow us to tailor a solution that addresses specific weaknesses.

Rather than relying on assumptions, we base our recommendations on real-world data. This approach ensures your design is targeted, cost-effective, and compliant.

3. Acoustic Design Review

Once testing is complete, we conduct a full design review of your proposed party walls and floors. This includes detailed analysis of the three key acoustic design principles:

Mass – Heavier materials tend to block sound more effectively.
Isolation – Structurally separating elements can reduce vibration transfer.
Absorption – Soft, porous materials absorb sound within a space.

Using data from thousands of tests across a wide range of projects, we help you choose the best construction method to meet or exceed Part E requirements. We also work closely with your team to ensure the design is practical to implement and cost-efficient.

4. Pre-Completion Sound Testing

The final step in the process is the pre-completion sound test. This test is required by Building Control to confirm that your development meets Approved Document E standards. We use state-of-the-art Norsonic equipment and carry out all testing under UKAS accreditation, meaning our results are guaranteed to be accepted by authorities.

Once the test is complete, we provide a detailed report and, if the build passes, certification for sign-off.

If you’ve received a request from your local authority for sound insulation testing, get in touch with us directly at 01525 303905 or visit our website to book your site visit.

Supporting Every Stage of the Build

Our services don’t stop at testing. At APT Sound Testing, we work alongside developers from early design right through to completion. Whether you’re building a handful of houses or managing a large-scale apartment block, we’ve got the experience and expertise to guide you.

We’ve worked on hundreds of projects across the UK, including:

New build homes
Residential conversions
Hotels and student accommodations
Large apartment developments
Mixed-use commercial spaces

Each project is different, and we tailor our approach accordingly. Need on-site advice during construction? We can visit your site to ensure materials are installed correctly. Have a design challenge? We’ll work with your architects to find smart, cost-effective solutions.

Why Choose APT Sound Testing?

There are plenty of consultants out there—but here’s why our clients choose us:

UKAS-Accredited: Our sound testing laboratory is fully accredited, ensuring all results are reliable and legally recognised.
End-to-End Support: From design advice to final testing, we offer a complete solution under one roof.
Highly Experienced: We’ve carried out thousands of tests and reviewed hundreds of acoustic designs. We know what works.
Cost-Effective Solutions: We help you achieve compliance without overspending. No unnecessary upgrades—just effective, tailored advice.
Reliable Communication: Got questions? We’re just a phone call or email away, with clear, jargon-free answers and prompt support.

Avoiding Common Pitfalls in Acoustic Design

In our experience, the most common reasons for sound test failures include:

Use of lightweight blocks without adequate acoustic treatment
Poor workmanship around junctions, sockets, and service penetrations
Misunderstanding of material performance
Incorrect installation of acoustic insulation

These problems can almost always be avoided with early intervention and good planning. By involving us at the design stage, you’ll have the confidence that your construction is on the right track from day one.

Let’s Talk About Your Project

Whether you’re in the early stages of planning or nearing completion, we can help ensure your acoustic requirements are met. Our team is responsive, experienced, and ready to assist with any aspect of your project.

📞 Call us: 01525 303905
🌐 Visit: www.aptsoundtesting.co.uk

We’re happy to provide a free consultation to discuss your needs and suggest the best next steps.

Trusted Consultancy Service

Sound insulation is too important to leave to chance. By partnering with a trusted acoustic consultancy like APT Sound Testing, you can ensure your building meets regulatory requirements, avoids costly failures, and delivers the best possible experience for future occupants.

With our straightforward process, technical expertise, and proactive approach, we help you move from design to delivery with confidence.

Ready to talk? Get in touch today — and let’s build something better together.

# About the Author

Connect with Darren Helliwell:

[Thermal Imaging Surveys] Thermal Imaging Surveys | APT Building Thermography Reports

[APT Email] info@aptsoundtesting.co.uk

[LinkedIn] https://www.linkedin.com/in/darren-helliwell-78789b26

Guide to Sound Testing in London

By admin | April 17, 2025 | Comments 0 Comment

Introduction to Sound Testing in London

When constructing or converting residential buildings in London, one crucial but often overlooked aspect is sound insulation. Ensuring your property meets the necessary acoustic standards isn’t just a courtesy to future occupants—it’s a legal requirement.

Under Building Regulations Approved Document Part E, developers are required to demonstrate that separating walls and floors between dwellings provide adequate resistance to the passage of sound. Whether you’re constructing a new apartment block, converting a house into flats, or repurposing a commercial space into residential use, sound testing plays a vital role in ensuring compliance and creating comfortable living environments.

So, what does sound testing involve, and what types should you expect during your project in London? Let’s dive into the details.

Why Is Sound Testing Important?

Sound testing is designed to assess the effectiveness of acoustic insulation between dwellings. The goal is to ensure a reasonable level of sound separation—so that people can enjoy peace and privacy in their own homes without being disturbed by their neighbours.

In London, with its dense housing stock and increasing number of mixed-use developments, proper sound insulation is more important than ever. This is especially critical in buildings where different households share walls or floors.

When Is Sound Testing Required?

If your project involves:

A new-build dwelling
A conversion into self-contained flats
A material change of use (e.g., turning an office into residential units)

…and the dwellings are attached via a shared wall or floor that is not used exclusively by the same occupants, then sound testing is mandatory before completion.

According to the regulations, at least 10% of each type of separating wall or floor construction must be tested.

The Two Main Types of Sound Testing

Sound testing typically falls into two categories: Airborne Sound Testing and Impact Sound Testing. Depending on your building’s layout and construction, both may be required.

1. Airborne Sound Testing

Airborne sound testing measures how well walls or floors prevent sound from traveling through the air—such as talking, TV noise, or music.

This test is commonly carried out between adjacent rooms in separate dwellings—like bedrooms or living rooms—both horizontally (side by side) and vertically (floor to ceiling).

How It Works:

A loudspeaker is placed in the “source” room and generates high sound levels. The sound levels are then measured in both the source and adjoining “receiver” room using a calibrated microphone. Background noise levels and the reverberation time (how long sound lingers) are also recorded to ensure accuracy.

What’s the Requirement?

New build: Minimum of 45 dB airborne sound insulation
Conversions: Minimum of 43 dB

The higher the decibel value, the better the sound insulation.

2. Impact Sound Testing

Impact sound testing is relevant for vertically-separated dwellings—for example, between an upstairs flat and a downstairs unit. This test assesses the level of noise generated by impacts (think footsteps, dropped items) on the floor.

How It Works:

A tapping machine is placed on the floor in the upper room. This device drops small hammers in a controlled sequence to simulate footfall. Sound levels are then measured in the room below. Like with airborne testing, reverberation and background levels are also taken into account.

What’s the Requirement?

New build: No more than 62 dB
Conversions: No more than 64 dB

In this case, the lower the decibel value, the better the insulation performance.

Sample Sound Testing During Conversions

If you’re converting an existing building—such as turning an old office into flats—it’s wise to carry out sample sound testing before you start construction.

Why? Because many older buildings weren’t designed with acoustic separation in mind. You might find:

Insufficient mass in the separating structure
Poor isolation between walls/floors
Unintended sound paths (known as flanking transmission)

Common Flanking Paths

One of the most frequent culprits is the inner leaf of an external cavity wall—particularly if it’s built using lightweight blocks like Thermalite. Sound can travel along these paths and reduce overall insulation performance, even if the separating wall or floor is well-built.

By doing a pre-construction sample test, you’ll get an accurate picture of the current sound insulation and can plan a targeted acoustic upgrade—potentially saving time and costly remedial works later on.

Sound Testing of External Facades

Another area of acoustic performance often overlooked is the external facade. This is particularly relevant for properties located in noisy areas—like those near busy roads, railways, or flight paths.

How It Works:

A loudspeaker is placed approximately 5 meters outside the building at a 45-degree angle.
Sound pressure levels are measured 2 meters in front of the facade and 1.5 meters above ground.
The results help evaluate how much environmental noise enters through the external envelope of the building.

This type of testing is essential for developers targeting high-performance builds or for residential units located in designated noise-sensitive zones.

Professional, Accredited Testing Services

Sound testing must be performed by qualified professionals using high-precision equipment. At APT Sound Testing, our engineers use Class 1 Norsonic instruments — the gold standard in acoustic testing.

We carry out testing to UKAS-accredited and ISO-compliant standards, ensuring results you (and your building inspector) can trust. Whether you need testing for a small conversion or a large residential scheme, our team has the experience to guide you through every step.

Get in Touch

If you’re working on a building project in London and need sound testing to comply with Part E of the Building Regulations, we’re here to help. From pre-construction advice to final handover testing, APT Sound Testing provides a complete acoustic consultancy service.

📞 Call us on 01525 303905
🌐 Visit: APT Sound Testing Services