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.

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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.

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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.

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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.

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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.

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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

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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

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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.

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.

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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.

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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

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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).

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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

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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.

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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.

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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.

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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.

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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.

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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.

Thermal Imaging Heat Loss Surveys

Thermal Imaging Survey helps track down the sources of heat loss in your home or commercial building, whether that be poorly installed or missing insulation, cold air infiltration into voids or direct draughts through the building envelope.  

It’s worth noting that over 60% of the UK’s residential and commercial properties suffer from some form of heat loss. Heat loss can be due to many factors; however, the main ones are:

• Missing wall, floor, and ceiling Insulation – Possible causes include damage or inadequate installation and water ingress. 
• Thermal Bridging – The movement of heat through the building structure tvia material bridging
• Windows and Doors – poor draft excluders and poorly installed fixtures and fittings allowing heat escape through gaps.
• Structural Integrity – roofs and walls and floors

Excess heat loss can result in increased energy usage which means higher bills to the end user/occupiers as well unhappy occupants experiencing drafts and cold areas within the building. If there are unexplained cold areas in your building and/or you think your energy bills are too high, then you should consider a Thermal Imaging Heat Loss Survey.

The main issues are:

Insulation problems

Poor Insulation is one main reasons for heat loss, the other being poor airtightness. Unfortunately, poor insulation is not usually visible to the naked eye, being hidden within the fabric of the building.

Thermal imaging inspections can quickly reveal where issues have arisen during the construction process, such as poorly installed, missing, or damaged insulation

Draughts

Draughts are very uncomfortable for occupiers and are usually an indication of heat loss through the building envelope.  Like insulation problems identifying the source of draughts is not always obvious. In many cases air can be coming into the building via multiple gaps and cracks in walls, floorboards and doors, windows.

A thermal imaging survey can quickly identify cold traces that give away the air leakage paths, where the cold air is entering the property.

Heating and damp problems

A thermal imaging inspection can pick up on air trapped in the heating system and unbalanced heating systems – radiators etc. it can Also identify leaking underfloor heating and uninsulated pipework hidden in service voids.  

Thermal imaging can also pick up problems with damp, although it is recommended that this is supplemented with an inspection using specialist testing equipment, such as combined thermal imaging and moisture meters.

Common air leakage paths found during thermal surveys

There can literally be hundreds of air leakage paths through building envelopes, here are some of the most common areas we have previously identified during heat loss surveys: 

1. Via ductwork and service penetrations where services enter the building.
2. Around the bottom of the external cladding.
3. Faulty or unpowered roof lights not shutting properly.
4. Wall/floor junctions under kitchen and utility room cupboards.
5. Around SVP and waste pipe penetrations passing through external walls and ceilings.
6. Around services that pass behind all IPS panels in toilet/shower areas.
7. Service riser cupboards that are not re compartmentalised from the rest of the building.
8. Unsealed bath and shower tray panels.
9. Damaged or poorly installed Background trickle ventilators, passive ventilation systems and any permanently open uncontrolled natural ventilation openings.
10. Poorly installed ductwork to mechanical ventilation and/or air conditioning systems.  
11. External door/windows that are not shutting tightly against their own seals and the frames are not sealed against the surrounding walls.  
12. Internal doors that are not sealed at the floor junction.
13. Internal sliding doors with unsealed pocket boxing into walls.
14. Dot & dab plasterboard that has a unsealed gap In between the bottom of the plasterboard and the structural floor.
15. Unsealed perpendicular mortar joints
16. Unsealed cavities and roof voids as well as holes that bridge the cavity or roof void.
17. Unsealed block work that has not been painted
18. Poorly finished cladding at perimeter joints of individual sheets, areas where it meets at different angles.
19. Around areas within ceilings voids, to include steel penetrations, service penetrations and the perimeter/eaves junction.
20. Around uninstalled and/or unsealed sockets, and light fittings housed in plasterboard.

Use a thermal imaging company with experience of heat loss surveys.

At APT Sound testing, we have 20 years’ experience identify heat loss using thermal imaging surveys. Our engineers hold a Level 3 certification which is some of the highest in the industry. We use the latest high resolutions cameras costing over twenty thousand pounds.

Our thermal specification includes:

1. Level 3 thermographic certification
2. Level 3 qualified thermographers
3. Large format FLIR cameras with 45-degree lenses

All of our thermal surveys are followed up with an extensive report, identifying problems and suggesting resolutions. We can also supply drones that are equipped with thermal cameras, perfect for identifying heat loss in roofs and elevated areas of a building were safe access is difficult and expensive. We can undertake Thermal Imaging to identify heat loss in all types of buildings from large commercial buildings to office spaces, schools, and historic houses.

Do I need an internal or external thermal survey?

Clients often ask do they need an internal or external thermal survey to best identify heat loss in their building? There is an easy answer to this question – Both!

Wherever possible its always best to gather the most gather information possible at the time of the survey, so to allow for this a thermal scan of both the inside and outside of the building needs to take place, to ascertain what’s happening both the internal and external building envelope. by undertaking an external and internal survey, we can gather different and complimentary data for both sides of a wall or roof. In many cases an internal survey will pick up different issues to an external survey and visa-versa.

Sometimes, it may not be possible to undertake both types of surveys, such as surveying a flat on the 20^th floor of a high-rise block; however, wherever possible we will always strive to inspect both sides of every wall and roof we survey.

Is combined thermography and air leakage testing worthwhile?

Is combined air tightness and thermography worthwhile? A resounding YES! It’s a very powerful combination.

As air leakage testing becomes more important for compliance with Part L requirements and reduce energy loss there is a natural partnership between thermal imaging and air tightness testing; so, why is this?

Thermal imaging and air tightness testing are not interchangeable – they are important in their own right – but they provide a similar goal, to locate sources of heat loss in buildings.  In many cases, thermal inspections can help locate the air leakage paths that the blower door test has highlighted by pressuring the building. Combining the best parts of air tightness testing and thermography allows for clearer and more defined results to be generated to better highlight and target air leakage points around dwellings and commercial buildings.  

APT Sound Testing is UKAS accredited to undertake air tightness testing and we hold Level 3 thermal imaging certification. This allows us to provide a combined service to clients for combined thermal imaging and air tightness testing for compliance with BREEAM or other requirements.

Thermal Surveys to Save Money & Energy

Using our well trained and equipped thermography engineers can quickly and accurately locate faults and provide the information you need to target the correct repair first time, saving you huge sums of money over traditional destructive investigations! Our Thermal Imaging Surveys highlight where your home or office building is losing massive amounts of heat and recommend where you can make improvements to conserve energy and keep occupiers happy!

Thermal Surveys can be extremely useful when acquiring a new or existing building such as:

• Identifying defects in a new or existing building, prior to purchase allowing you to negotiate a better price with the seller, considering the costs for the remedial works.
• Check for upgrades to the building and structure.
• To check if the cost of maintenance outweighs the use and value of the building.

It doesn’t matter if you are halfway through a build or taking over a hundred-year-old block of flats, we can start to save you money by identifying heat loss quickly and with no fuss. A quick survey with our thermal cameras will identify areas of heat loss and you can then put actions into place to ensure your energy consumption goes down. The short-term costs of extra insulation will save you money in the long run.

Our thermal imaging heat loss surveys roadmap.

1. APT will book in a convenient time to visit your project, allowing for optimal weather conditions – if it’s cold enough. In the event that the weather forecast is unsuitable then we will contact you to rearrange the thermal survey visit.
2. When we arrive at site, we will undertake a site walk and discuss the problems you (or your building occupiers) are encountering with heat loss and draughts.
3. Using the collected information, we will carry out a thorough thermal imaging survey of your building both inside and out – you should allow 1-3 hours for the survey depending on the size of your building.
4. The detailed thermal imaging reports are typically supplied in 24 to 48 hours. You will receive your thermal imaging report in PDF format – this includes the images we have captured, along with our interpretation of the problems indicated.

What information do we need to undertake the thermal survey?

The usual information we require prior to being able to undertake a thermal imaging survey is:

1. The type and size of building.
2. Floor plans and elevation drawings for the building.
3. Any site-specific items to actions, i.e. attending site inductions and/or bringing specific ID such as passports, driving licence etc.
4. The amount of time required to safely undertake the survey.
5. The type of equipment required to undertake the inspection.
6. The project location and subsequent travel time.
7. The project deliverables – what needs to be included within the thermal survey report.

Please contact us for more information

Our team of thermographers are highly experienced in carrying out thermal imaging surveys and have many years’ experience in all aspects of engineering, construction, maintenance, management, and professional survey work.

Our thermal imaging equipment is the best and most accurate on the market, ensuring we pick up faults that other equipment may miss. Our reports are professionally presented and are clear, concise, and easy to follow. We endeavour to give our clients a first-class service every time.

If you would like to contact us for more information on our thermal imaging services, please contact us on 01525 303905 or email us at info@aptsoundtesting.co.uk. Alternatively if you would like more information on how to prepare for your thermal imaging survey, please visit the APT Sound Testing website or download our thermal imaging checklist

What Is an Electrical Thermal Imaging Survey?

An Electrical Thermal Imaging Survey is a non-invasive, non-destructive inspection method that uses infrared (IR) technology to detect potential electrical issues before they become costly or dangerous.

By capturing temperature variations across electrical components, thermal imaging can quickly highlight hidden faults — without interrupting your operations. This makes it one of the most efficient, safe, and cost-effective diagnostic tools for electrical maintenance.

Because it identifies problems before equipment fails, thermal imaging helps reduce repair costs, extend the lifespan of assets, and even uncover opportunities for energy savings.

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What’s Involved in an Electrical Thermal Imaging Survey?

Thermal imaging is widely used across industries to inspect electrical systems of all sizes — from small control panels to large high-voltage installations. By spotting faults early, it prevents breakdowns, equipment replacements, and even potential fire risks.

During an electrical thermal imaging survey, our engineers use high-resolution infrared cameras to examine components such as:

• Busbar systems
• Distribution and fuse boards
• High-voltage systems
• Transformers
• Control panels
• Battery and UPS systems
• Switchgear and switchboards

This process is part of predictive maintenance, allowing facilities to stay ahead of faults and maintain high safety and efficiency standards.

Our inspections follow strict protocols to ensure that any issues flagged are genuine faults requiring investigation — not simply loaded circuits generating temporary heat.

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Common Issues Detected by Thermal Imaging

Thermographic inspections can reveal a wide range of potential failures, including:

• Poor Connections: Early detection of loose or overloaded electrical connections.
• Electrical Leakage: Identification of current leaks before they cause harm or damage.
• Insulator Defects: Ensuring insulation integrity to prevent dangerous arcing or short circuits.
• Internal Fuse Damage: Spotting overheating fuses that could lead to failure.
• Oxidation on High-Voltage Switches: Detecting resistance at connectors before it escalates into a major issue.

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What Our Electrical Inspections Include

Our electrical thermal imaging surveys are thorough and data-driven. Each inspection involves:

• Safe removal of all accessible panels (in line with Permit to Work requirements).
• Individual trend pages for every inspected item — including thermograms, digital images, ambient and measured temperatures, and ΔT (temperature differential).
• Automatic comparison with previous inspections, showing up to four thermograms per item for accurate condition monitoring.
• Graphical trend analysis of temperature data for easy review.

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Detailed Thermal Imaging Fault Reports

Our detailed reports don’t just show where faults exist — they also assess severity and impact using precise calculations.

Each report includes:

• Load-corrected temperature estimates (100% operational load).
• Severity grading based on BS7671 standards.
• Maximum safe operating currents to maintain safe temperature levels.
• Instant digital report generation, sent directly to the client upon completion.

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Why Use a Level 3 Thermography Engineer?

Using a Level 3 Certified Thermographer ensures your inspection meets the highest professional and safety standards. Our Level 3 engineers are trained to develop predictive maintenance programs, write inspection procedures, and interpret severity criteria with precision.

To help clients prepare, we’ve published supporting guides:

• [How We Carry Out Thermal Surveys on Commercial Buildings]
• [Thermal Imaging Inspections for Facilities Management]
• [What Is a BREEAM Thermal Imaging Survey?] — great for projects seeking BREEAM certification points.
• [Thermal Imaging Checklist] — to help you get ready for your survey.

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Professional Thermal Imaging Surveys in London & the South East

At APT Thermography, we use the latest high-resolution thermal imaging cameras to deliver accurate, reliable inspections across London and the South East.

From small commercial sites to large power stations, our experience covers it all — helping clients quickly diagnose and resolve faults through clear, actionable reporting.

We’re proud to provide a proactive, end-to-end service that keeps your building’s electrical systems safe, efficient, and compliant.

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📞 Get in Touch
For more information or to book an Electrical Thermal Imaging Survey, contact us today:
📧 info@aptthermography.net
📞 01525 303905 or 07775 623464

Thermal Imaging Surveys & APT Sound Testing

APT Sound Testing provide UKAS accredited sound testing & Thermal Imaging Surveys for London and the whole of the UK as required by Approved Document E of the Building Regulations. We undertake projects on all types of residential buildings and commercial buildings. We also undertake sound testing on schools and buildings containing rooms for residential purposes.

Thermal Imaging Surveys in London

A thermal Imaging survey is a completely non-invasive method of investigating many aspects of a building that are virtually impossible by any other method.

Thermal Imaging Process

A thermal Imaging survey is an extraordinary method of investigating many aspects of a building that is completely non-invasive.

Thermal Imaging Inspections use IR Thermography to identify a wide range of issues such as:

• Incorrectly applied or inadequate insulation within the building envelope

• Locating air leakage paths into/out of your building

• Moisture infiltration

• Poor moisture barriers

There is no other low impact and accurate way to assess the unseen performance of insulation or the building fabric.

A thermal Imaging Survey can is also ideal for identifying water penetration through roofs or other parts of a building structure, alleviating the need for time consuming water dye tests which are not always accurate.

APT Sound Testing uses the latest Flir Thermal Imaging Cameras for our thermography report generation and as well as utilising the latest software for accurate reportage and trend analysis.

This means or thermal imaging reports can be issued within hours of the survey being completed with recommendations to help our clients deal with every eventuality.

How we Prepare for a Thermographic Survey

What is also important is that there must be no direct or residual solar loading from the sun in the building.

Many companies have their thermal imaging surveys undertaken an hour or so after sunset and this is usually flawed and may lead to inaccurate results. Whilst there may be rate exceptions to this, as a rule, there will be solar load in the building for many hours after sunset.

Therefore, we have learnt to undertake more accurate reportage the thermal imaging surveys should generally be conducted in the early hours of a cold morning, approx.

Two hours before the sun can fall on the building. It is more difficult to undertake conduct these types of heat loss survey during summer months when the ground temperatures and surrounding buildings are at high temperatures for months on end; however, this can be overcome by ramping up internal temperatures within the building and using the latest and more advanced thermal imaging cameras.

In all cases APT Sound Testing will check each project in isolation to ensure the correct site conditions are in place prior to undertaking the thermal imaging survey in compliance with the requirements with BS EN 13187. Building Regulations Part L and this link both offer lots of useful information in regards to Thermography Surveys.

We have years of experience working with a wide range of clients that span both the public and private sectors. We have clients ranging from self-builders through to the largest housing developers. We also work with the health authority and the banking sector on their cleanroom testing. Our clients have benefited from our wealth of knowledge and friendly, proactive service that we provide.

If you need more information on how to prepare your building for a Thermal Imaging Survey please download our air tightness testing checklist. If you would like more information in regards to our, please visit our website or call us Direct on 07775 623464.

Thermal Imaging Helps Surveyors Assess Commercial Properties

When investing in a commercial property, whether it’s an office block, retail space, or mixed-use building, it’s vital to uncover hidden issues before you commit. Traditional surveys are essential, but they often can’t see what lies beneath the surface. That’s where thermal imaging comes in.

Thermal imaging surveys use advanced infrared cameras to detect temperature differences in building materials and systems. These subtle variations can reveal problems that the naked eye would miss, helping surveyors provide buyers with a far more accurate picture of a building’s condition.

Here are some of the key ways thermal imaging benefits commercial property buyers:

1. Spotting Hidden Building Issues

Thermal imaging highlights issues like electrical faults, water ingress, and defects in the building envelope, problems that standard inspections might overlook. Detecting these early allows buyers to make informed decisions and avoid costly surprises after purchase.

2. Improving Energy Efficiency

Heat loss through poor insulation or gaps in the building fabric is a common (and expensive) issue. Thermal imaging pinpoints these areas precisely, so targeted repairs can be made. This not only improves comfort but also reduces long-term energy bills—a major consideration for commercial buyers.

3. Enhancing Safety

Overheating electrical components and circuits can be a serious fire risk. Thermal inspections quickly identify these hazards, ensuring they can be repaired before occupation. The technology also reduces the need for intrusive checks in hard-to-reach areas, keeping surveyors safe during inspections.

4. Non-Invasive Inspections

Unlike methods that involve drilling or dismantling parts of the building, thermal imaging is completely non-destructive. Surveyors can carry out detailed checks quickly and efficiently, without damaging the property in any way.

5. Detecting Pests

Rodents and insects often go unnoticed until they’ve caused significant damage. With thermal imaging, surveyors can spot unusual heat signatures behind walls or ceilings that suggest pest activity, helping prevent future health and maintenance issues.

6. Negotiation Power

Knowledge is leverage. A comprehensive thermal imaging report gives buyers hard evidence of hidden defects, strengthening their position in negotiations. Whether requesting repairs or securing a price reduction, this insight can directly save money.

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How Our Thermal Imaging Surveys Work

At APT Sound Testing, we use the latest high-specification thermal cameras to deliver detailed and accurate surveys. Here’s a look at how the process works:

• Infrared Technology – Our cameras detect subtle temperature changes across surfaces, translating them into clear images that highlight areas of concern. We only use large-format, high-resolution FLIR thermal imaging cameras with wide-angle lenses for maximum coverage.
• Comprehensive Scanning – Our Level 3 certified thermographers examine walls, roofs, floors, electrical systems, plumbing, and insulation. This thorough approach ensures that no hidden issues go unnoticed.

Common Issues We Identify

Thermal imaging can uncover hundreds of potential faults. Some of the most common include:

• Water Leaks & Moisture – Detecting damp areas inside walls, ceilings, and floors before visible damage occurs.
• Insulation Gaps – Pinpointing missing or failing insulation to improve energy performance.
• Electrical Overheating – Identifying hot spots in wiring and equipment that could pose fire risks.
• Structural Defects – Highlighting cracks, weak points, and other problems within the building envelope.

Each of these findings can directly impact negotiations, repair plans, and the long-term value of the property.

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Why Choose APT Sound Testing?

When it comes to thermal imaging, expertise and equipment matter. At APT Sound Testing, we go above and beyond industry standards to deliver the most accurate results possible:

• Level 3 Thermographic Certification – The highest accreditation available.
• Level 3 Qualified Electrical Thermographers – Ensuring electrical inspections are carried out to the highest safety standards.
• Large-Format FLIR Cameras – With 45° lenses for wide-area scanning.
• Detailed Reporting – Every survey includes thermal indexing formulas for fault diagnosis, grading, and prioritisation.

Our surveys not only meet but exceed requirements such as BREEAM, giving clients full confidence in their investment.

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Book Your Thermal Imaging Survey

If you’re considering a commercial property purchase, don’t leave hidden issues to chance. Our thermal imaging surveys provide peace of mind, negotiation leverage, and a detailed roadmap for future maintenance and improvements.

📞 Call APT Sound Testing today on 01525 303905 to book your survey or discuss your requirements with one of our experts.

Thermal Imaging Helps Inspect Commercial Properties

Thermal imaging has become an indispensable tool for surveyors assessing office blocks, retail units, and other commercial buildings. Whether you’re a buyer seeking reassurance or a surveyor conducting due diligence, infrared technology can reveal critical issues long before they become costly surprises.

Why Thermal Imaging Matters for Buyers and Surveyors

Uncover Hidden Defects
Infrared cameras expose problems invisible to the naked eye, such as electrical faults, water leaks, or weaknesses in the building envelope. Early detection means buyers get a clear picture of a property’s true condition before signing on the dotted line.

Boost Energy Efficiency
Heat loss through walls, roofs, or windows shows up instantly on a thermal scan. These insights let buyers plan targeted insulation upgrades and reduce future energy bills.

Enhance Safety
Overheating electrical components and other potential fire risks are easy to spot with thermal imaging. Identifying hazards before occupancy helps protect both people and property, while reducing the need for risky high-level or confined-space inspections.

Non-Invasive Inspection
Unlike traditional methods that involve drilling or removing panels, thermal imaging is entirely non-destructive. Surveyors can inspect large areas quickly without disturbing finishes or disrupting operations.

Spot Pest Activity
Rodents and insects give off heat. Thermal imaging can detect their presence behind walls or under floors, helping prevent damage and health concerns.

Strengthen Negotiation Power
A detailed thermal report provides evidence of defects, giving buyers leverage to request repairs or negotiate a better purchase price.

How a Thermal Imaging Survey Works

Our surveys use high-resolution infrared cameras to capture temperature variations across surfaces. These subtle differences appear as colour-coded images, pinpointing hidden problems.

During an inspection, we typically scan:

• Walls, ceilings, and floors
• Electrical systems and switchgear
• Plumbing and pipework
• Roofs and insulation layers

Common issues revealed include:

• Water leaks and moisture in walls, ceilings, or floors
• Insulation gaps that drive up heating or cooling costs
• Electrical hotspots that pose fire risks or threaten uptime
• Structural defects such as hidden cracks or voids

Why Choose APT Sound Testing

APT Sound Testing delivers thermal imaging surveys that exceed BREEAM requirements. Our credentials include:

• Level 3 thermographic certification (the industry’s highest)
• Level 3 qualified electrical thermographers
• Large-format FLIR cameras with 45-degree lenses for wide, detailed scans
• Comprehensive reports with thermal indexing formulas for fault diagnosis, qualification, and severity grading

Book Your Survey

Considering a commercial property purchase? Let us help you make an informed decision.
Call APT Sound Testing on 01525 303905 to schedule a thermal imaging survey or discuss your requirements.

Premium Thermal Imaging Surveys & APT Sound Testing

When building problems strike, whether it’s a hidden roof leak, failing insulation, or an unexpected electrical fault, you don’t have time to wait. You need immediate answers, and you need them to be accurate. That’s exactly what our Premium Thermal Imaging Service delivers.

Our Level 3 certified thermographers use industry-leading FLIR thermal imaging cameras to provide rapid, reliable diagnostics. Whether it’s an urgent fault or part of a preventative maintenance plan, our surveys give you the clarity you need to act with confidence.

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What is a Thermographic Survey?

A thermographic survey (also known as thermal imaging) uses infrared technology to detect subtle temperature variations across building surfaces. This makes it possible to uncover hidden issues such as:

• Heat loss from missing or damaged insulation
• Moisture ingress and leaks
• Electrical faults and overheating components
• Structural defects invisible to the naked eye

The best part? This method is non-invasive and safe. There’s no need for disruptive inspections or risky work at height. It’s a smarter, faster way to protect your property.

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Why Level 3 Thermographers Make the Difference

Not all thermal imaging providers are equal. Our team is comprised of Level 3 certified thermographers, the highest qualification in the field. This ensures:

• Expert analysis of critical faults
• Practical, actionable recommendations
• Long-term trend analysis for recurring issues
• Advanced insights across electrical, thermal, and structural systems

In other words, we don’t just deliver images — we provide solutions.

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The FLIR Advantage: Industry-Leading Imaging Technology

We exclusively use FLIR thermal imaging cameras, trusted worldwide for their precision and reliability. These high-performance tools offer:

• Ultra-high-resolution imaging to detect the smallest anomalies
• Radiometric data capture for accurate temperature readings
• Advanced features like image enhancement and wireless reporting

Every survey we conduct is backed by clear, detailed results you can rely on.

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Key Benefits of Our Infrared Surveys

✅ Rapid Problem Identification – Immediate diagnostics to support urgent decisions.
💷 Save on Repair Costs – Spot issues early to avoid expensive downtime and damage.
⚡ Improve Safety – Identify overheating electrical components before they fail.
🌱 Boost Energy Efficiency – Resolve insulation gaps and thermal bridging to cut utility bills.
📝 Professional Reports – Easy-to-understand documents with annotated images and recommendations, ideal for facilities management and insurance.

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Why Choose APT Sound Testing?

Here’s what sets us apart from standard thermal imaging providers:

• Expertise – All surveys are carried out by Level 3 thermographers.
• Technology – Only the best-in-class FLIR cameras for maximum accuracy.
• Responsiveness – Fast, last-minute service without cutting corners.
• Customer Focus – We understand that emergencies can’t wait, so we deliver with speed and professionalism.

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Book Your Thermal Imaging Survey Today

Don’t leave hidden faults to chance. Whether you’re dealing with an emergency or planning a preventative check, our Premium Thermal Imaging Service gives you the confidence and clarity you need.

📞 Call us on 01525 303905 / 07775 623464
📧 Email us at info@airpressuretesting.net

APT Sound Testing – safeguarding your building, one thermal image at a time.

Thermal Imaging Surveys: Accurate & Professional

When building issues strike without warning, like hidden roof leaks, insulation failures, or electrical faults, there’s no time to waste. You need immediate answers, and you need them to be accurate. That’s exactly what our Premium Last-Minute Thermal Imaging Service delivers.

Whether you’re dealing with urgent faults or just want to stay one step ahead with preventative maintenance, our high-precision infrared surveys are conducted by Level 3 thermographers using cutting-edge FLIR thermal imaging cameras. This elite combination guarantees fast, expert diagnostics with unmatched reliability.

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What is a Thermographic Survey?

A thermographic survey, also known as thermal imaging, uses infrared technology to detect temperature variations on a building’s surface. This allows our experts to identify hidden problems such as:

• Heat loss due to missing or damaged insulation
• Moisture ingress
• Electrical faults
• Structural issues invisible to the naked eye

This method is not only cost-effective but also non-invasive, meaning there’s no need for risky work at height or intrusive inspections. It’s a safer, faster, and smarter way to protect your building.

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Why Level 3 Thermographers Matter

Our thermal imaging team is comprised of Level 3 certified thermographers, the highest qualification in the field. This certification reflects advanced training in thermography, complex diagnostics, and in-depth data interpretation.

These professionals don’t just take pictures, they solve problems. They can:

• Provide expert analysis of critical faults
• Offer clear, actionable remediation guidance
• Conduct long-term trend analysis for recurring issues
• Deliver high-level insights across electrical, structural, and thermal systems

In short, you’re not just getting a survey, you’re getting a strategic asset in your building maintenance toolkit.

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The FLIR Advantage: Top-Tier Thermal Imaging Technology

We exclusively use FLIR thermal imaging cameras, widely recognized as the gold standard in infrared technology. These state-of-the-art devices offer:

• High-resolution imaging to detect even the smallest temperature differences
• Radiometric data capture for precise measurement
• Advanced features like image enhancement and wireless reporting

This ensures every thermal image we take provides maximum clarity and actionable insights—no guesswork, just facts.

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The Benefits of Last-Minute Infrared Surveys

✅ Rapid Problem Identification

In an emergency, speed is everything. Our last-minute service delivers fast diagnostics so you can take immediate corrective action.

💷 Save on Repair Costs

By spotting issues early, we help prevent costly repairs and avoid downtime, saving you money in the long run.

⚡ Improve Safety

Thermal imaging reveals dangerous faults like overheating electrical components, helping you mitigate risks before they become hazards.

🌱 Boost Energy Efficiency

Detect and resolve insulation gaps or thermal bridging to improve your building’s energy performance and lower utility costs.

📝 Professional Reports

All surveys include a detailed, easy-to-understand report with annotated thermal images and clear recommendations, ideal for facilities management and insurance documentation.

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Why Choose Us?

Not all thermal imaging providers offer the same level of service. Here’s what sets the APT Sound Testing premium offering apart:

• Expertise – All surveys are carried out by seasoned Level 3 thermographers.
• Technology – We use only the best-in-class FLIR cameras for optimal results.
• Responsiveness – We specialise in urgent, last-minute surveys without compromising on quality.
• Customer-Focused – We understand that emergencies can’t wait, so we move quickly and professionally to support your needs.

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Book Your Last-Minute Thermal Imaging Survey Today

Whether you’re facing an unexpected issue or need a comprehensive building check-up, our Premium Last-Minute Thermal Imaging Service gives you the confidence and clarity to take action.

📞 Call APT Sound Testing on 01525 303905 / 07775 623464
📧 Email us at info@airpressuretesting.net

Let us help you safeguard your building, one thermal image at a time.

Thermal Imaging Surveys & Electrical Systems

Thermal imaging inspections are one of the most effective, non-intrusive ways to assess the health of electrical systems. Whether you’re managing a commercial property, industrial facility, or large-scale infrastructure, thermal imaging offers critical insights that can help reduce risk, increase efficiency, and lower costs.

While there are countless benefits to infrared thermographic surveys, here are the some of the major reasons why every business should consider regular inspections of their electrical systems:

1. Enhance Safety and Reduce Fire Risk

Overheated electrical components, loose connections, and failing systems are serious hazards that can lead to equipment failure, or worse, fires that endanger lives. Thermal imaging detects these issues early, helping you take action before a problem escalates.

2. Enable Preventive Maintenance

Thermal surveys allow you to spot problems before they cause downtime. By identifying potential faults early, you can replace or repair components proactively, saving time, money, and stress.

3. Improve Energy Efficiency

A single fault in your electrical system can cause a significant spike in energy use. Infrared inspections help you find and fix hidden inefficiencies, ultimately reducing energy consumption and operational costs.

4. Reduce Costs with Predictive Insights

Infrared surveys typically uncover five to eight electrical faults per inspection. These surveys are quick, cost-effective, and help you avoid expensive emergency repairs by identifying minor issues before they become major failures.

5. Stay Compliant with Fire Safety Regulations

Standards such as NFPA 70B recommend annual infrared inspections for electrical systems. Compliance not only improves safety but also protects your business from unplanned outages, equipment damage, and potential insurance claims.

6. Lower Insurance Premiums

Some insurers may offer reduced premiums for businesses that implement regular thermographic surveys as part of a documented preventive maintenance plan. It’s a small investment that could yield long-term financial benefits.

7. Safe, Non-Intrusive Testing

Thermal imaging is a non-contact, non-disruptive testing method. Inspections are conducted with your systems live and running, meaning no downtime or interruption to operations.

8. Targeted Maintenance Planning

By identifying exactly which components need attention—and the severity of any issues—you can plan maintenance more effectively, aligning it with operational schedules and reducing unnecessary repairs.

9. Extend Equipment Lifespan

Thermographic surveys provide valuable insights into the operating condition of your equipment. This helps prolong the life of critical assets by preventing premature failure and enabling smarter energy management.

10. Minimise Downtime and Breakdown Costs

Electrical failures can lead to production halts, expensive repairs, injury claims, or even litigation. Proactive infrared inspections drastically reduce these risks by catching faults before they lead to serious consequences.

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How Often Should You Conduct an Infrared Electrical Inspection?

For most facilities, we recommend scheduling an infrared electrical inspection every 6 to 12 months as part of a robust preventive maintenance plan. However, for environments with high-demand equipment, such as manufacturing plants or data centres, annual inspections are the minimum. Factors like equipment age, environmental conditions, and fault history may also influence inspection frequency.

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Professional Thermal Imaging Services in London

At APT Sound Testing, we specialise in delivering high-quality thermal imaging surveys for electrical systems across London and the UK. Our team of Level 3 certified thermographers use industry-leading FLIR P6n-Series (640×480 resolution) thermal imaging cameras to deliver pinpoint accuracy and professional insights.

Our Service Includes:

• An ITC-trained thermographer and Level 3 reporting assessment
• External inspection of:
  • Distribution boards
  • Fuse boards
  • Switchgear and switchboards
  • Control panels
  • Busbar systems
  • Transformers
• Identification of issues such as:
  • Loose connections
  • Overloaded/fatigued components
  • Uneven voltage distribution
  • Cooling blockages in transformers
• A comprehensive report highlighting all areas of concern

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Need expert thermal imaging for your electrical systems?
📧 Email us at: info@aptsoundtesting.co.uk
📞 Call APT Sound Testing on: 01525 303905 or 07775 623464

Let’s help you improve safety, reduce risk, and save money, one thermal image at a time.

# 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