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Thermal Imaging Surveys
Thermal Imaging & Commercial Buildings

Thermal Imaging & Commercial Buildings

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Thermal Imaging Surveys for Commercial Buildings

Thermal imaging (thermographic) surveys are one of the most effective diagnostic tools for identifying heat loss in commercial buildings across London and the South East. Using advanced infrared technology, these surveys clearly highlight where energy is escaping, often revealing issues that building owners are completely unaware of.

Many of our clients are genuinely surprised by the number and scale of heat loss sources uncovered during a thermal imaging survey. Common problems include cold draughts caused by air leakage through cracks in the building envelope, as well as missing or poorly installed insulation within walls, floors, or roof spaces, sometimes entire sections are found to have been overlooked during installation.

How Do We Carry Out a Thermal Imaging Survey?

We aim to arrange a site visit at a time that is convenient for you. Thermal imaging surveys are typically carried out between November and April, as suitable weather conditions are essential for accurate results. In some cases, surveys may need to be rescheduled if conditions are unsuitable, such as during heavy rainfall or periods of high daytime and nighttime temperatures.

On arrival, our thermal engineer will discuss any known heat loss issues, draughts, or comfort concerns you have, as well as your objectives for the survey. Unlike many competitors, we always conduct both internal and external thermal surveys as standard, ensuring a comprehensive assessment of your building’s performance.

How Long Does a Thermal Imaging Survey Take?

The duration of a survey depends on the size of the building and how involved you wish to be. We strongly encourage building owners or site representatives to accompany our engineer during the inspection. This collaborative approach allows us to explain findings in real time and ensures you gain a clearer understanding of the issues identified.

  • Small to medium buildings: 1–2 hours
  • Large commercial buildings: 3–4 hours

Allow additional time if you have specific questions or multiple areas of concern.

When Will You Receive the Thermal Imaging Report?

Your comprehensive thermal imaging report is typically delivered within 1–2 working days in PDF format. The report includes:

  • Thermal and visual images
  • Clear interpretation of findings
  • Identification of defects and potential causes

Many other providers take 1–2 weeks to deliver reports, so our fast turnaround ensures you can act quickly.

Why Choose Us for Your Thermal Imaging Survey?

Our engineers are trained to Level 3 thermographic certification, the highest level achievable in the industry. Combined with our use of large-format FLIR thermal imaging cameras, this ensures the highest possible accuracy and clarity when identifying defects.

Our Specification Includes:

  • Level 3 thermographic certification
  • Level 3 qualified thermographers
  • Large-format FLIR cameras with 45-degree lenses

This combination gives you the best possible chance of accurately diagnosing and resolving thermal performance issues.

What Types of Buildings Benefit from Thermal Imaging Surveys?

Thermal imaging surveys are suitable for a wide range of building types, including:

  • Commercial buildings
  • Office blocks
  • Schools and colleges
  • Warehouses and storage facilities
  • Military infrastructure
  • Flats, houses, and residential tower blocks
  • Housing stock (local authorities and property managers)
  • Flat roofing systems

What Building Defects Can Thermal Imaging Identify?

Thermal imaging surveys can reveal hundreds of potential defects. Some of the most common issues we identify include:

  • Poor construction detailing
  • Missing or damaged insulation
  • Thermal and cold bridging
  • Air leakage and unintended openings
  • Moisture penetration and water ingress
  • Poor thermal comfort
  • Damp and mould issues

Contact Us for More Information

If you would like to learn more about our thermal imaging services, please contact us on 01525 303905, complete our online form or email info@aptsoundtesting.co.uk.

Alternatively, visit our website for guidance on preparing for a thermal imaging survey or download our Thermal Imaging Checklist.

Improving Sound Insulation In London
Improving Sound Insulation on London Property Developments

Improving Sound Insulation on London Property Developments

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Improving Sound Insulation on London Property Developments
Many of the dwellings in London consist of flats converted from large Victorian houses.. Unfortunately at the time of the building conversion, designing for sound insulation was not a high priority and so many of the dwellings suffer from adverse noise transference between the floor and wall partitions. This can be extremely stressful to the occupant’s well being is a major cause for concern.

Sound Testing Services

There are ways to improve the airborne and impact performance by improving the wall/floor partitions ability to reduce the amount of sound transmission from one side of a construction element to the other. By isolating the different materials may not be enough its own and you may need to improve the mass of the partition as well.

Improving Existing Floor Partitions
In our experience of undertaking hundreds of sound insulation tests in London, refurbishment projects usually achieve 30-35dB for airborne sound and 70dB for Impact Sound, if the existing construction has not been acoustically upgraded. These figures do not meet the required 43dB & 64dB as stipulated in Part E of Building Regulations. As sound double every 10dB this is a massive failure and acoustic improvements must be made. Many existing construction consist of a similar construction as shown in as detail 1 below.

Acoustic Improvements to Existing Floor Partitions
To reduce airborne and impact sound transmission this usually means adding density and isolation to the floor construction. This can be as simple as adding a drop ceiling consisting of 125mm timber frame. The top of the frame must be a minimum of 25mm below the existing ceiling finish – such as lathe and plaster. Then, to the inside of the timber frame add 100mm of Acoustic Wool and two layers of sound-board tacked to the bottom of the timber frame – all boards to be lapped.

This should improve your sound test results by approx. 10-15dB depending on the existing site conditions and quality of the installation. Detail 2 shows this in more detail.

Improving Existing Wall Partitions
The standard onsite construction for existing internal walls may be a mixture of 100mm masonry with render applied to either side; or, 100mm timber partition with lathe and plaster to either side. Unfortunately neither of these existing wall constructions will have the acoustic properties to pass Part E in their existing state due to lack of mass and poor isolation values.

Improving Wall Partitions
One way to quick and simple way improve the acoustic performance of a the dividing wall partition, is to install a 70mm metsec partition in front of the existing wall – its usually best to install this in the largest room. Leave approx. 25mm gap between the back of the metsec and the wall. Then install 50mm acoustic wool to the inside of the metsec and add two layers of soundboard to the outside of the metsec frame, ensuring all boards are properly lapped and the perimeter joints are filled with acoustic mastic.

Taking the above into account is it essential that the acoustic design is addressed right from the start of the refurbishment project, so it prevents delays in handover, i.e. to prevent the dwelling failing the sound testing at building control signoff stage.– a common problem.

We can also offer acoustic design advice and UKAS sound testing on existing flats to ensure that the building handover is not delayed due to noncompliance with Part E. We can also undertake sample sound testing on projects where clients are worried about existing ‘hybrid’ construction/s to help highlight the existing noise levels so acoustic upgrades – if required) can be quickly targeted and implemented.

If you would like advice on your acoustic design or require sound insulation testing in London, please contact us now on 01525 303905 or contact us at info@aptsoundtesting.co.uk.

Sound Testing Services in London
APT Sound Testing Services in London

APT Sound Testing Services in London

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Searching for APT Sound Testing in London

At APT Sound Testing, we carry out professional sound testing on all types of residential and commercial buildings across London and throughout the UK. Our services also cover schools and buildings that include rooms for residential use. As a UKAS-accredited provider, all of our testing meets the requirements of Approved Document E of the Building Regulations.

A Friendly, Proactive Approach to Acoustic Compliance

We pride ourselves on offering a friendly, forward-thinking service that covers everything from acoustic design and consultancy to full pre-completion testing and certification. With many years of experience supporting clients in both the public and private sectors, we work with everyone—from self-builders and small developers to major national house builders. We also support specialist sectors, including healthcare and banking, particularly for cleanroom testing.

Our clients value not only our deep technical knowledge but also our approachable, proactive way of working. This commitment to service is one of the reasons we enjoy one of the highest return-client rates of any pre-completion testing consultancy in the UK.

Local Expertise with National Reach

Unlike many providers, we never subcontract our work. All testing is completed by our in-house engineers, ensuring consistency, quality, and reliability across every project.

With an office located in central London, we’re ideally positioned to respond quickly to urgent survey and testing requirements. We also have the capacity to carry out last-minute appointments and weekend testing, a service used frequently by clients in fast-paced sectors such as banking.

Qualified Engineers, UKAS Accreditation, and Modern Equipment

Our highly trained engineers deliver an efficient, customer-focused service from the initial design phase through to project completion. Thanks to decades of accumulated acoustic design experience, we understand the unique needs of each project and can tailor our advice accordingly.

As a multi-UKAS accredited laboratory operating to strict ISO standards, we guarantee a high level of quality and professionalism. We invest heavily in state-of-the-art acoustic testing and survey equipment, all calibrated to UKAS standards, enabling us to deliver accurate and dependable results.

Integrated Acoustic and Air Tightness Services

To make compliance as smooth as possible, we also offer in-house UKAS-accredited air tightness testing, allowing clients to combine both services in a single, seamless package—reducing costs and avoiding coordination headaches.

Get in Touch

If you need advice or want to book a sound test, we’re here to help. Contact us through our online form or call 01525 303905 to discuss your project with one of our friendly and knowledgeable acoustic or air-tightness consultants.

Sound Testing Roadmap
Sound Testing Roadmap for Leaseholders

Sound Testing Roadmap for Leaseholders

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Sound Testing Roadmap for Leaseholders

This guide is designed specifically for leaseholders who are upgrading their floor finishes from carpet to wood. It explains why sound testing is required, what the tests measure, and how to ensure compliance with lease conditions and Building Regulations.

🔎 Why Leaseholders Require Sound Testing to Floors

Many residential leases include covenants that:

  • Require carpets to remain in place, or
  • Demand proof that any new hard floor finish (such as wood or laminate) achieves equivalent sound insulation performance to the original construction.

Why?

  • Carpets naturally reduce impact noise (footsteps, moving furniture).
  • They also help limit airborne noise.
  • Replacing carpet with wood often increases both impact and perceived noise in the flat below unless acoustic upgrades are installed.

Freeholders and management companies typically request acoustic evidence to prevent disputes and ensure compliance with lease terms or Building Regulations Part E.

📊 Pre‑Works and Post‑Works Sound Testing

  • Pre‑works sound testing: Baseline measurements are taken with the existing carpet finish to record current airborne and impact insulation performance. These results set the target values for the new floor system.
  • Acoustic upgrades: Specialist acoustic companies can recommend tailored upgrades (e.g., underlays, insulation, resilient ceiling systems) to maximise the chance of passing post‑works testing.
  • Post‑works sound testing: Conducted after installation and upgrades, using the same methods to provide a direct comparison with baseline results.
  • Test standards and measurements: Reports follow recognised methods for airborne and impact sound reduction. Results are compared against lease requirements, Building Regulations Part E, or the pre‑works baseline.

👉 Tip: Always confirm test protocol, locations, and pass criteria with your management company before starting work. This ensures results are accepted without dispute.

📐 How to Compare and Complete Sound Test Results

  1. Match test conditions: Post‑works sound tests must replicate pre‑works setup (same receiver positions, furniture state, doors/windows closed).
  2. Compare metrics:
    • Airborne noise: Higher sound reduction (dB) = better. Post‑works values should equal or exceed baseline.
    • Impact noise: Lower sound pressure level (Lp) = better. Post‑works values should be equal to or lower than baseline.
  3. Produce a compliance report: Include:
    • Accredited test certificates
    • A clear table comparing pre‑ and post‑works values
    • Photographic evidence of acoustic measures
    • A signed statement confirming the tested configuration represents the finished floor system
  4. If results fail: Document remedial measures and re‑test. Common fixes include adding or improving acoustic layers above/below joists.

Accurate records and clear reporting help secure freeholder sign‑off or a formal Licence to Alter.

✅ Summary

Converting from carpet to wood in a leasehold flat almost always requires both pre‑works and post‑works sound testing. The best chance of compliance comes from:

  • Baseline testing
  • Targeted acoustic upgrades (underlays, cavity insulation, resilient ceilings, specialist panels)
  • Post‑works verification

This combined approach ensures no loss of acoustic performance compared with the original carpet finish.

📞 Contact Us Today

Our expertise, comprehensive services, and commitment to quality make us the trusted choice for sound insulation testing. We use the latest UKAS calibrated sound test equipment so you can be sure you are in safe hands.

  • 📧 Email: info@aptsoundtesting.co.uk
  • 📱 Call Darren direct: 07775 623464

Contact us today to schedule a sound test or learn more about our acoustic design services.

New Wood Floors
Sound Testing for New Wood Floors

Sound Testing for New Wood Floors

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Leaseholder Sound Testing for New Wood Floors: What You Need to Know

Upgrading a leasehold flat by replacing carpet with a hard flooring finish, such as engineered wood or solid timber, is a popular renovation choice. However, this simple change can trigger strict lease conditions requiring Leaseholder Sound Testing for Floors and, in many cases, acoustic upgrades.

Before you lift a single carpet tile, it’s important to understand why sound testing matters, what’s involved, and how to ensure your new flooring doesn’t fall foul of your lease.

This guide is written for leaseholders, managing agents, freeholders, and contractors who need to comply with sound testing regulations when switching to hard floors.

Why Sound Testing Is Required When Changing Carpet to Wood

Most leases include a covenant that either:

✔ Requires soft flooring (carpet) to remain in place
or
✔ Permits hard flooring only if sound insulation performance is proven to match the original construction

Carpet naturally absorbs footfall noise and helps limit sound transferring to the flat below. Hard finishes amplify:

  • Impact noise — footsteps, chair movement, dropped items
  • Airborne noise — voices, TV noise, music

Without proper acoustic upgrades, neighbours below may experience increased disturbance — leading to complaints, disputes, and even legal action.

That’s why freeholders and management companies often demand acoustic evidence and test certificates before approving alterations or issuing a Licence to Alter.

What Sound Testing Involves

Professional Leaseholder Sound Testing typically includes three stages:

1️⃣ Pre-Works Sound Testing (Baseline)

Carried out before removing carpets to record current acoustic performance:

  • Airborne sound insulation
  • Impact sound performance

These results become the target your new floor must meet or exceed.

2️⃣ Acoustic Upgrade Design

Based on the baseline results, an acoustic specialist may recommend:

  • Acoustic underlays
  • Floating floor systems
  • Additional mass or separation above joists

These upgrades improve your chances of passing the final test.

3️⃣ Post-Works Sound Testing

Once the new floor and acoustic layers are installed, the same tests are repeated to confirm compliance.

To avoid disputes, always agree the test method, pass criteria, and reporting format with the freeholder beforehand.

How Sound Test Results Are Compared

To ensure a fair comparison:

  • Test conditions must match (same room layouts, similar positioning)
  • Airborne sound insulation should be equal or better than the baseline
  • Impact noise levels should be equal or lower

If results fail, remedial upgrades will be required — followed by a re-test.

Clear, UKAS-approved reporting helps:

✔ Prove compliance
✔ Secure freeholder approval
✔ Prevent future noise-related conflicts

Acoustic Improvements for Hard Flooring

Effective solutions above joists may include:

  • High-performance acoustic underlay
  • Floating floor systems
  • Additional resilient layers to reduce structure-borne noise

With the right design, a wooden floor can meet — or even improve — on carpet performance.

Need Leaseholder Sound Testing? We Can Help.

We provide a complete acoustic testing and consultancy service for leaseholders across London and the South East:

Our service includes:

  • UKAS-accredited sound testing
  • Class 1 Norsonic calibrated equipment
  • Fully compliant reports accepted by Building Control and freeholders
  • Expert acoustic advice and upgrade recommendations if improvements are needed

📩 Email: info@aptsoundtesting.co.uk
📞 Call APT Sound Testing: 01525 303905

Whether you’re a leaseholder applying for a Licence to Alter or a managing agent enforcing compliance, we ensure your flooring upgrade is carried out smoothly — and soundly.

A Thermographic Survey

A Thermographic Survey

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A Thermographic Survey ~ Transform Your Property

Every home or building leaks energy, it’s just a matter of how much. In the UK, where energy prices continue to rise and the push toward net zero targets intensifies, understanding where your property is losing heat is more critical than ever. That’s where a thermographic survey, also known as a thermal imaging survey, comes in.

This advanced, non-invasive technique can uncover the hidden issues costing you money and comfort every single year, without tearing open walls or ceilings. Whether you’re a homeowner, landlord, developer, or business owner, a professional thermographic survey could be the key to unlocking your building’s full energy-saving potential.

What Is a Thermographic Survey?

A thermographic survey uses infrared cameras to detect and visualise heat patterns within a building. The resulting images, known as thermograms, make invisible problems instantly visible: areas where heat escapes, insulation is missing or poorly installed, air is leaking, or damp spots are forming.

This technology works by measuring temperature variations on surfaces and translating them into colour-coded images. Hot areas show up in warmer colours (like red or yellow), while colder areas appear in shades of blue or purple. The beauty of this method? It allows for fast, accurate assessment with no damage or disruption to your property.

Why Thermographic Surveys Matter in the UK

The UK housing stock is among the least energy-efficient in Europe. It’s estimated that around 26% of the country’s total energy consumption comes from domestic buildings, with 80% of that going directly into heating and hot water.

Despite this massive energy use, many homes continue to suffer from:

  • Poor insulation
  • Draughty windows and doors
  • Leaky roofs and walls
  • Unnoticed construction flaws

Even new-builds or recently renovated properties can fall short due to hidden gaps in workmanship or insulation installation. A thermal imaging survey is one of the fastest, most accurate ways to pinpoint these issues and create a roadmap for improvement.

Top Benefits of a Professional Thermographic Survey

Investing in a thermographic survey is about more than just diagnostics—it’s about actionable improvements that pay off. Here’s what you stand to gain:

1. Lower Energy Bills

By identifying and fixing draughts, thermal bridges, or insulation gaps, you reduce the amount of heat your building loses—cutting heating costs significantly.

2. Increased Comfort

No one likes cold spots, chilly corners, or rooms that never quite feel warm enough. Thermal imaging helps you eliminate these uneven temperature zones for a cosier, more comfortable indoor environment.

3. Early Damp and Mould Detection

Cold areas are prone to condensation, which can lead to mould and long-term structural issues. Thermographic surveys catch these problems before they become visible, protecting your health and your home.

4. Insulation Validation

Whether you’ve just installed new insulation or want to check the effectiveness of older material, a thermal imaging survey verifies whether it’s doing its job—saving you from wasted investments.

5. Sustainability and Compliance

From BREEAM standards to future government mandates on energy efficiency, thermal imaging helps you stay compliant and demonstrate climate responsibility. It also adds value when selling or renting your property.

What to Expect During a Thermographic Survey

If you’ve never booked one before, here’s how the process typically works:

✅ Tailored Consultation

We begin with a brief discussion about your property type, energy concerns, and goals. This helps us customise the survey to your specific needs.

✅ Best Timing

Thermal surveys are most effective in colder months or during times with a strong indoor-outdoor temperature difference—early morning or evening is ideal.

✅ Comprehensive Assessment

Our certified thermographers will scan both interior and exterior surfaces, using high-resolution infrared cameras to identify problem areas across walls, roofs, doors, windows, and floors.

✅ Professional Reporting

Within a few days, you’ll receive a detailed, illustrated report showing exactly where your property is losing energy—complete with explanations and recommendations for improvement.

✅ Expert Advice

Our team will walk you through the findings and help prioritise the most cost-effective and impactful upgrades.

Who Should Consider a Thermal Imaging Survey?

A thermographic survey is suitable for a wide range of properties and owners, including:

  • Homeowners looking to reduce bills and enjoy a warmer home
  • Landlords and property managers aiming to boost EPC ratings and tenant comfort
  • Buyers wanting peace of mind before a purchase
  • Architects and builders needing verification for new construction
  • Businesses, schools, and organisations working toward net zero goals

Whether you’re retrofitting an older home, quality-checking a new build, or developing an energy strategy for a commercial building, thermal imaging gives you the clear data needed to act.

Why Choose Us?

Not all thermographic surveys are created equal. With us, you’re getting industry-leading expertise backed by decades of hands-on experience. Here’s what sets our service apart:

  • Certified Thermographers: Our team is fully trained and certified to deliver accurate results.
  • High-Tech Equipment: We use top-of-the-line infrared cameras and support tools like blower door and smoke testing for enhanced diagnostics.
  • Fast Turnaround: Most surveys take 1–2 hours and reports are delivered within 5–10 working days.
  • Competitive Pricing: Transparent quotes with no hidden fees.
  • Regulatory Support: Assistance with BREEAM, EPC improvements, and building compliance.

FAQs

How long does the survey take?
Surveys usually last between 1 to 2 hours, depending on the size and complexity of the building.

Do I need to prepare my home?
Yes, but it’s simple. We’ll give you clear guidance, such as heating your home a few hours in advance and keeping doors and windows shut during the survey.

How soon will I get the report?
Your illustrated thermographic report is typically delivered within 5–10 working days.

Take the First Step Toward a Warmer, Greener Property

Don’t wait for another winter of high bills and cold rooms. A thermographic survey offers a fast, affordable way to make your property more efficient, comfortable, and future-ready.

Contact our expert team today to get a free consultation or instant quote. Most surveys are completed in under two hours—and the energy savings could last a lifetime.

About the Expert: Darren Helliwell

Darren Helliwell is a seasoned building performance specialist with over 25 years of experience in thermographic surveys, blower door testing, and airtightness consulting. He has worked on prestigious projects like Harrods, Battersea Power Station, and the Imperial War Museum, helping teams enhance building performance and energy efficiency.

Using advanced infrared cameras and complementary testing tools, Darren’s team identifies air leakage, insulation defects, and thermal bridging in both new and existing buildings. His mission? To empower homeowners, architects, and contractors with the insights they need to build better, healthier, and more efficient spaces.

👉 Connect on LinkedIn
📧 info@aptsoundtesting.co.uk
🌐 APT Building Thermography ReportsEvery home or building leaks energy—it’s just a matter of how much. In the UK, where energy prices continue to rise and the push toward net zero targets intensifies, understanding where your property is losing heat is more critical than ever. That’s where a thermographic survey, also known as a thermal imaging survey, comes in.

This advanced, non-invasive technique can uncover the hidden issues costing you money and comfort every single year—without tearing open walls or ceilings. Whether you’re a homeowner, landlord, developer, or business owner, a professional thermographic survey could be the key to unlocking your building’s full energy-saving potential.

What Is a Thermographic Survey?

A thermographic survey uses infrared cameras to detect and visualise heat patterns within a building. The resulting images, known as thermograms, make invisible problems instantly visible: areas where heat escapes, insulation is missing or poorly installed, air is leaking, or damp spots are forming.

This technology works by measuring temperature variations on surfaces and translating them into colour-coded images. Hot areas show up in warmer colours (like red or yellow), while colder areas appear in shades of blue or purple. The beauty of this method? It allows for fast, accurate assessment with no damage or disruption to your property.

Why Thermographic Surveys Matter in the UK

The UK housing stock is among the least energy-efficient in Europe. It’s estimated that around 26% of the country’s total energy consumption comes from domestic buildings, with 80% of that going directly into heating and hot water.

Despite this massive energy use, many homes continue to suffer from:

  • Poor insulation
  • Draughty windows and doors
  • Leaky roofs and walls
  • Unnoticed construction flaws

Even new-builds or recently renovated properties can fall short due to hidden gaps in workmanship or insulation installation. A thermal imaging survey is one of the fastest, most accurate ways to pinpoint these issues and create a roadmap for improvement.

Top Benefits of a Professional Thermographic Survey

Investing in a thermographic survey is about more than just diagnostics—it’s about actionable improvements that pay off. Here’s what you stand to gain:

1. Lower Energy Bills

By identifying and fixing draughts, thermal bridges, or insulation gaps, you reduce the amount of heat your building loses—cutting heating costs significantly.

2. Increased Comfort

No one likes cold spots, chilly corners, or rooms that never quite feel warm enough. Thermal imaging helps you eliminate these uneven temperature zones for a cosier, more comfortable indoor environment.

3. Early Damp and Mould Detection

Cold areas are prone to condensation, which can lead to mould and long-term structural issues. Thermographic surveys catch these problems before they become visible, protecting your health and your home.

4. Insulation Validation

Whether you’ve just installed new insulation or want to check the effectiveness of older material, a thermal imaging survey verifies whether it’s doing its job—saving you from wasted investments.

5. Sustainability and Compliance

From BREEAM standards to future government mandates on energy efficiency, thermal imaging helps you stay compliant and demonstrate climate responsibility. It also adds value when selling or renting your property.

What to Expect During a Thermographic Survey

If you’ve never booked one before, here’s how the process typically works:

✅ Tailored Consultation

We begin with a brief discussion about your property type, energy concerns, and goals. This helps us customise the survey to your specific needs.

✅ Best Timing

Thermal surveys are most effective in colder months or during times with a strong indoor-outdoor temperature difference—early morning or evening is ideal.

✅ Comprehensive Assessment

Our certified thermographers will scan both interior and exterior surfaces, using high-resolution infrared cameras to identify problem areas across walls, roofs, doors, windows, and floors.

✅ Professional Reporting

Within a few days, you’ll receive a detailed, illustrated report showing exactly where your property is losing energy—complete with explanations and recommendations for improvement.

✅ Expert Advice

Our team will walk you through the findings and help prioritise the most cost-effective and impactful upgrades.

Who Should Consider a Thermal Imaging Survey?

A thermographic survey is suitable for a wide range of properties and owners, including:

  • Homeowners looking to reduce bills and enjoy a warmer home
  • Landlords and property managers aiming to boost EPC ratings and tenant comfort
  • Buyers wanting peace of mind before a purchase
  • Architects and builders needing verification for new construction
  • Businesses, schools, and organisations working toward net zero goals

Whether you’re retrofitting an older home, quality-checking a new build, or developing an energy strategy for a commercial building, thermal imaging gives you the clear data needed to act.

Why Choose Us?

Not all thermographic surveys are created equal. With us, you’re getting industry-leading expertise backed by decades of hands-on experience. Here’s what sets our service apart:

  • Certified Thermographers: Our team is fully trained and certified to deliver accurate results.
  • High-Tech Equipment: We use top-of-the-line infrared cameras and support tools like blower door and smoke testing for enhanced diagnostics.
  • Fast Turnaround: Most surveys take 1–2 hours and reports are delivered within 5–10 working days.
  • Competitive Pricing: Transparent quotes with no hidden fees.
  • Regulatory Support: Assistance with BREEAM, EPC improvements, and building compliance.

FAQs

How long does the survey take?
Surveys usually last between 1 to 2 hours, depending on the size and complexity of the building.

Do I need to prepare my home?
Yes, but it’s simple. We’ll give you clear guidance, such as heating your home a few hours in advance and keeping doors and windows shut during the survey.

How soon will I get the report?
Your illustrated thermographic report is typically delivered within 5–10 working days.

Take the First Step Toward a Warmer, Greener Property

Don’t wait for another winter of high bills and cold rooms. A thermographic survey offers a fast, affordable way to make your property more efficient, comfortable, and future-ready.

Contact our expert team today to get a free consultation or instant quote. Most surveys are completed in under two hours—and the energy savings could last a lifetime.

About the Expert: Darren Helliwell

Darren Helliwell is a seasoned building performance specialist with over 25 years of experience in thermographic surveys, blower door testing, and airtightness consulting. He has worked on prestigious projects like Harrods, Battersea Power Station, and the Imperial War Museum, helping teams enhance building performance and energy efficiency.

Using advanced infrared cameras and complementary testing tools, Darren’s team identifies air leakage, insulation defects, and thermal bridging in both new and existing buildings. His mission? To empower homeowners, architects, and contractors with the insights they need to build better, healthier, and more efficient spaces.

👉 Connect on LinkedIn
📧 info@aptsoundtesting.co.uk
🌐 APT Building Thermography Reports

Why a Thermographic Survey Could Transform Your Property

Every home or building leaks energy—it’s just a matter of how much. In the UK, where energy prices continue to rise and the push toward net zero targets intensifies, understanding where your property is losing heat is more critical than ever. That’s where a thermographic survey, also known as a thermal imaging survey, comes in.

This advanced, non-invasive technique can uncover the hidden issues costing you money and comfort every single year—without tearing open walls or ceilings. Whether you’re a homeowner, landlord, developer, or business owner, a professional thermographic survey could be the key to unlocking your building’s full energy-saving potential.

What Is a Thermographic Survey?

A thermographic survey uses infrared cameras to detect and visualise heat patterns within a building. The resulting images, known as thermograms, make invisible problems instantly visible: areas where heat escapes, insulation is missing or poorly installed, air is leaking, or damp spots are forming.

This technology works by measuring temperature variations on surfaces and translating them into colour-coded images. Hot areas show up in warmer colours (like red or yellow), while colder areas appear in shades of blue or purple. The beauty of this method? It allows for fast, accurate assessment with no damage or disruption to your property.

Why Thermographic Surveys Matter in the UK

The UK housing stock is among the least energy-efficient in Europe. It’s estimated that around 26% of the country’s total energy consumption comes from domestic buildings, with 80% of that going directly into heating and hot water.

Despite this massive energy use, many homes continue to suffer from:

  • Poor insulation
  • Draughty windows and doors
  • Leaky roofs and walls
  • Unnoticed construction flaws

Even new-builds or recently renovated properties can fall short due to hidden gaps in workmanship or insulation installation. A thermal imaging survey is one of the fastest, most accurate ways to pinpoint these issues and create a roadmap for improvement.

Top Benefits of a Professional Thermographic Survey

Investing in a thermographic survey is about more than just diagnostics—it’s about actionable improvements that pay off. Here’s what you stand to gain:

1. Lower Energy Bills

By identifying and fixing draughts, thermal bridges, or insulation gaps, you reduce the amount of heat your building loses—cutting heating costs significantly.

2. Increased Comfort

No one likes cold spots, chilly corners, or rooms that never quite feel warm enough. Thermal imaging helps you eliminate these uneven temperature zones for a cosier, more comfortable indoor environment.

3. Early Damp and Mould Detection

Cold areas are prone to condensation, which can lead to mould and long-term structural issues. Thermographic surveys catch these problems before they become visible, protecting your health and your home.

4. Insulation Validation

Whether you’ve just installed new insulation or want to check the effectiveness of older material, a thermal imaging survey verifies whether it’s doing its job—saving you from wasted investments.

5. Sustainability and Compliance

From BREEAM standards to future government mandates on energy efficiency, thermal imaging helps you stay compliant and demonstrate climate responsibility. It also adds value when selling or renting your property.

What to Expect During a Thermographic Survey

If you’ve never booked one before, here’s how the process typically works:

✅ Tailored Consultation

We begin with a brief discussion about your property type, energy concerns, and goals. This helps us customise the survey to your specific needs.

✅ Best Timing

Thermal surveys are most effective in colder months or during times with a strong indoor-outdoor temperature difference—early morning or evening is ideal.

✅ Comprehensive Assessment

Our certified thermographers will scan both interior and exterior surfaces, using high-resolution infrared cameras to identify problem areas across walls, roofs, doors, windows, and floors.

✅ Professional Reporting

Within a few days, you’ll receive a detailed, illustrated report showing exactly where your property is losing energy—complete with explanations and recommendations for improvement.

✅ Expert Advice

Our team will walk you through the findings and help prioritise the most cost-effective and impactful upgrades.

Who Should Consider a Thermal Imaging Survey?

A thermographic survey is suitable for a wide range of properties and owners, including:

  • Homeowners looking to reduce bills and enjoy a warmer home
  • Landlords and property managers aiming to boost EPC ratings and tenant comfort
  • Buyers wanting peace of mind before a purchase
  • Architects and builders needing verification for new construction
  • Businesses, schools, and organisations working toward net zero goals

Whether you’re retrofitting an older home, quality-checking a new build, or developing an energy strategy for a commercial building, thermal imaging gives you the clear data needed to act.

Why Choose Us?

Not all thermographic surveys are created equal. With us, you’re getting industry-leading expertise backed by decades of hands-on experience. Here’s what sets our service apart:

  • Certified Thermographers: Our team is fully trained and certified to deliver accurate results.
  • High-Tech Equipment: We use top-of-the-line infrared cameras and support tools like blower door and smoke testing for enhanced diagnostics.
  • Fast Turnaround: Most surveys take 1–2 hours and reports are delivered within 5–10 working days.
  • Competitive Pricing: Transparent quotes with no hidden fees.
  • Regulatory Support: Assistance with BREEAM, EPC improvements, and building compliance.

FAQs

How long does the survey take?
Surveys usually last between 1 to 2 hours, depending on the size and complexity of the building.

Do I need to prepare my home?
Yes, but it’s simple. We’ll give you clear guidance, such as heating your home a few hours in advance and keeping doors and windows shut during the survey.

How soon will I get the report?
Your illustrated thermographic report is typically delivered within 5–10 working days.

Take the First Step Toward a Warmer, Greener Property

Don’t wait for another winter of high bills and cold rooms. A thermographic survey offers a fast, affordable way to make your property more efficient, comfortable, and future-ready.

Contact our expert team today to get a free consultation or instant quote. Most surveys are completed in under two hours—and the energy savings could last a lifetime.

About the Expert: Darren Helliwell

Darren Helliwell is a seasoned building performance specialist with over 25 years of experience in thermographic surveys, blower door testing, and airtightness consulting. He has worked on prestigious projects like Harrods, Battersea Power Station, and the Imperial War Museum, helping teams enhance building performance and energy efficiency.

Using advanced infrared cameras and complementary testing tools, Darren’s team identifies air leakage, insulation defects, and thermal bridging in both new and existing buildings. His mission? To empower homeowners, architects, and contractors with the insights they need to build better, healthier, and more efficient spaces.

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📧 info@aptsoundtesting.co.uk
🌐 APT Building Thermography Reports

Clean Room Testing
Discovering Clean Room Testing Services

Discovering Clean Room Testing Services

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Clean Room Testing Services: Ensuring Compliance

Cleanrooms are essential for safeguarding sensitive production environments, from nanotechnology and pharmaceuticals to aerospace and automotive manufacturing. To keep these controlled spaces performing as designed, a well-planned testing, certification, and maintenance programme is critical.

At APT Cleanroom Testing, we specialise in validating and certifying all types of cleanrooms, ensuring they meet operational objectives and regulatory standards.

Comprehensive Cleanroom Testing Services

We provide a full suite of cleanroom performance tests, covering everything from airborne particulate monitoring to airflow characterisation and environmental checks. Our services include:

Core Cleanroom Tests

  • Non-viable particulate monitoring
  • Airflow volume and velocity profiling
  • Air exchange rate calculations
  • HEPA filter integrity testing
  • Differential room pressure monitoring
  • Temperature and humidity monitoring

Using advanced smoke survey equipment, we also conduct detailed airflow visualisation tests to verify directional airflow and identify potential problem areas. To ensure cleanroom integrity, we perform air-tightness testing to detect leakage paths within the cleanroom envelope.

Accuracy, Documentation, and Minimal Downtime

Our expertise, coupled with a strong commitment to quality and customer service, ensures accurate, reliable test results with comprehensive documentation. We understand that cleanrooms are critical business assets, so we work efficiently to minimise downtime.

Following testing or full cleanroom validation, we provide a clear, structured report, often compiled and quality-checked while still on site. We take the time to walk you through your results, ensuring transparency and understanding at every stage.

All clients receive:

  • Full test certificates
  • Calibration certificates for all equipment used
  • Professional recommendations for performance or efficiency improvements

Particulate Testing and ISO Standards Compliance

APT Clean Room Testing engineers are trained to deliver validation services in line with the latest ISO standards and industry guidelines. Our meticulous approach, customer focus, and UKAS accreditation provide assurance that your facility meets all external calibration and compliance requirements.

ISO 14644-1:2015 – What’s Changed?

The revised ISO 14644-1:2015 standard introduced significant updates to cleanroom sampling procedures and data evaluation. Key changes include:

  • A more consistent, statistically valid method for determining sampling locations
  • Individual evaluation of each sampling point
  • A requirement ensuring, with 95% confidence, that 90% of the cleanroom area complies with particle concentration limits

These updates may require organisations to revise their validation plans and, in some cases, make changes to their cleanroom design or operation to maintain compliance.

Get in Touch Today

Want to learn more about how our cleanroom testing and validation services can support your operations? Contact APT Sound Testing on 01525 303905 or email info@aptsoundtesting.co.uk.

Smoke Shaft Air Testing
Guide to Smoke Shaft Air Testing

Guide to Smoke Shaft Air Testing

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Smoke Shaft Air Testing: Pass First Time

Smoke shafts play a crucial role in fire safety within high-rise buildings. As a key part of a building’s smoke control system, they’re designed to help manage smoke movement during a fire, keeping escape routes clearer for longer. Because of this vital function, the air-tightness of a smoke shaft isn’t optional—it’s essential.

Most smoke shafts must meet a strict air-tightness target (typically 3.8m³/hr/m²). If they fail to achieve this standard, it can compromise the performance of the entire smoke control system, leading to delays in sign-off from fire system contractors or Building Control.

Experts in Smoke Shaft Testing & Diagnostics

With extensive experience across smoke shafts of all sizes, we’ve helped countless clients achieve compliant test results. If a shaft fails its initial test, our diagnostic service quickly locates leakage paths using a combination of:

  • Smoke testing
  • Thermal imaging

This approach allows us to pinpoint exactly where air is escaping. We compile these findings into a clear, detailed air leakage report so that targeted remedial sealing can be carried out efficiently. In most cases, clients achieve a successful pass on the follow-up test.

Our Premium Smoke Shaft Testing Service Includes:

  • Comprehensive smoke shaft survey visits by experienced consultants
  • Testing carried out by a UKAS and ATTMA Level 2 accredited air testing company
  • Official UKAS/ATTMA-compliant smoke shaft air test certification
  • State-of-the-art, high-powered fan and UKAS-calibrated equipment
  • Industry-leading diagnostic services using smoke machines and thermal imaging
  • Fast, reliable turnaround with our rapid testing service

Air Pressure Testing is one of the few companies accredited to both UKAS and ATTMA Level 2 for air tightness testing of buildings, smoke shafts, and floor plenums.

Works to the Smoke Shaft: 

Certain events may require additional testing:

  • Alterations to the smoke shaft:If modifications are made to the fabric of the smoke shaft or adjacent areas, retesting is necessary.
  • Fire Incidents:After a fire incident, smoke shafts should be inspected and tested to confirm their ongoing integrity.
  • Building Occupancy Changes:If the building’s use changes significantly, retesting may be required, i.e. an office building to residentialConsult Local Authorities and Experts:Always consult with local fire safety authorities, building control officers, or fire engineers. They can provide specific guidance based on regional regulations and best practices.

Remember that maintaining properly functioning smoke shafts is essential for occupant safety during fires. Regular testing ensures their reliability and effectiveness in smoke extraction.

Need Smoke Shaft (AOV) Testing or a Checklist?

If you’d like more information about our smoke shaft testing services, or want to download our smoke shaft checklist, contact us by calling 01525 303905 or visit our website at:
www.aptsoundtesting.co.uk

We’re here to help you achieve compliance quickly, efficiently, and with confidence.

Air Tightness Testing
Importance of Air Tightness Testing

Importance of Air Tightness Testing

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Why Is Air Tightness Testing Important?

Maintaining a continuous and well-sealed air tightness barrier is essential for any building’s energy efficiency. Air tightness testing measures how much air escapes from inside the building to the outside through unintended gaps or leaks. When air leaks occur, they not only cause uncomfortable draughts but also significantly reduce energy performance.

A poorly sealed building can lose up to 50% of its heat through air leakage. This undermines the benefits of investing in energy-saving measures such as additional insulation, high-efficiency boilers, or renewable heating systems like ground source heat pumps.

Prioritising air tightness testing ensures your building performs as designed—helping you save money on energy bills and meet regulatory requirements. In fact, failing an air tightness test could prevent you from achieving Building Control sign-off and handing over the property.

By carrying out a test, you’ll receive a measurable air leakage rate (in m³/hr/m²), which indicates the volume of air lost or gained. This figure is then compared to the limits set by Building Regulations, determining whether the property meets compliance standards.

What Building Regulations Govern Air Tightness Testing?

Air tightness testing is required under two main parts of UK Building Regulations:

  • Part L1A – Governs air tightness for all new dwellings.
  • Part L2A – Applies to commercial and public buildings such as offices, schools, and retail spaces.

Compliance with these regulations is enforced by Building Control.

Air tightness testing is also a crucial component of both SAP (Standard Assessment Procedure) calculations for domestic buildings and SBEM (Simplified Building Energy Model) assessments for commercial ones. These assessments determine a building’s overall carbon footprint, which is directly influenced by how airtight the structure is.

What Happens if the Building Fails the Air Tightness Test?

At Air Pressure Testing, our goal is for your building to pass the first time. However, if the initial test doesn’t meet the required standard, we’ll work with you to identify and resolve the issues quickly to ensure a successful retest.

Some of the diagnostic techniques we use include:

  • Commercial Smoke Testing: We fill the building with smoke and then pressurise it to highlight leakage points — the smoke visibly escapes through gaps in the envelope. For smaller properties, we use handheld “smoke pencils” to pinpoint problem areas.
  • Thermal Imaging: Using infrared cameras, we can identify hot and cold spots throughout the building, helping locate areas of heat loss and air leakage.

Unlike some testing companies that simply test and leave, we provide a proactive support service, assisting you until your building achieves full compliance and Building Control approval.

Common Causes of Air Leakage

Air leakage can occur in many areas, often due to construction detailing or poor installation. The most common problem areas include:

  • Junctions between external walls and floors
  • Behind fitted kitchen or bathroom units
  • Around poorly sealed windows and doors
  • Around service penetrations (pipes, ducts, cables, etc.)
  • Through attic or loft access doors

By addressing these weak points early in the construction process, you can dramatically reduce the likelihood of air tightness test failures later on.

Need Expert Air Tightness Testing?

If you’d like more information about our air tightness testing and consultancy services, please don’t hesitate to contact Air Pressure Testing on 01525 303905, or visit our website to learn how we can help your project achieve full compliance and energy efficiency.

Thermal Imaging Inspections
Thermal Imaging Inspections

Thermal Imaging Inspections

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Thermal Imaging Inspections for Detecting Building and Equipment Faults

Identify faults before they become failures.
APT Sound Testing provides professional thermal imaging inspections to detect heat loss, electrical faults, moisture intrusion, and equipment issues in buildings and industrial systems. Using advanced infrared technology, our surveys help contractors, developers, and maintenance teams save time, reduce costs, and prevent safety hazards.

What Is Thermal Imaging?

Thermal imaging detects heat variations emitted by surfaces and materials. Using high-resolution infrared cameras, we capture detailed images that reveal hot and cold areas, identifying potential faults or inefficiencies.

When combined with blower door testing, thermal imaging becomes a powerful diagnostic tool for analysing building envelopes, pinpointing air leaks, insulation gaps, and structural weaknesses that are invisible to the naked eye.

Industries That Benefit from Thermal Imaging

One of the greatest advantages of thermal imaging is that it allows non-intrusive inspection. There’s no need to shut down equipment or interrupt operations.

Our certified thermographers can inspect systems safely from a distance, capturing accurate data without putting personnel or assets at risk. This makes thermal imaging invaluable across many industries, including:

  • Construction & Property Development
  • Manufacturing & Industrial Maintenance
  • Facilities Management (FM)
  • Utilities & Energy
  • Residential Building Inspections

Thermal Imaging for Building Inspections

Thermal imaging is a proven method for detecting issues in a building’s walls, roofs, floors, and insulation systems. It can identify:

  • Missing or damaged insulation
  • Dampness and water leaks
  • Thermal bridging and cold spots

It’s also worth noting that undertaking a thermal imaging survey can earn additional BREEAM credits for sustainable building performance.

Because moisture-laden materials are typically cooler than dry ones, our cameras can reveal hidden leaks and damp areas that traditional visual inspections might miss—saving you time, cost, and unnecessary disruption (e.g. scaffolding for roof access).

Thermal Imaging for Industrial Maintenance

For manufacturers and facility operators, unplanned downtime can be costly. Thermal imaging enables predictive maintenance and asset management without taking critical systems offline.

When integrated into a Condition-Based Maintenance (CBM) program, thermal imaging helps detect overheating electrical, mechanical, and process components before failure occurs. This reduces:

  • Equipment downtime
  • Repair and maintenance costs
  • Safety risks and business interruptions

Thermal Imaging for Electrical Systems

Electrical systems, from main incomers and transformers to circuit breakers and distribution boards, are critical infrastructure.

Thermal imaging allows engineers to identify hotspots and overloaded circuits early, preventing system failures and maintaining consistent service delivery. Inspections can be performed safely and quickly without direct contact with live components.

Thermal Imaging for Home Inspections

Homebuyers and inspectors can use thermal imaging to detect hidden defects such as:

  • Water leaks and dampness
  • Missing insulation
  • Air leakage and cold bridging

Our thermal surveys provide valuable insights, helping buyers make informed decisions and ensuring their investment is sound.

Air Leakage Detection with Thermal Imaging

When used with a blower door fan, thermal imaging can accurately detect air leaks in the building envelope. This allows for targeted remedial works to improve airtightness, reducing drafts and energy usage by up to 20% while enhancing indoor comfort and sustainability.

Locating Leaks in Underfloor Heating Systems

Thermal imaging is the fastest and least invasive way to identify leaks in underfloor heating systems. Instead of removing large sections of flooring, our thermographers can pinpoint the exact location of the issue, often allowing a single tile to be lifted and repaired, saving significant cost and disruption.

APT Sound Testing – Certified Level 3 Thermographers

APT Sound Testing is a leading UK provider of Level 3 thermal imaging inspections. We work with building contractors, FM providers, and construction and utility companies across London and nationwide.

Our professional service includes:

  • Level 3 Certified Field Engineers
  • High-Resolution, Fully Calibrated Thermal Cameras
  • Advanced Diagnostic Software
  • Over 20 Years of Thermography Experience

Whether you need a BREEAM building envelope survey or ongoing maintenance inspections, our team delivers accurate, detailed thermal reports and expert guidance every step of the way.

Contact Us

Let our thermographic survey engineers help you detect issues before they become costly repairs.

📞 Call us: 01525 303905
💬 Enquire online: Contact Form

APT Sound Testing – your trusted partner for thermal imaging inspections, acoustic testing, and airtightness solutions across the UK.