Infrared thermal imaging to detect heat loss and hidden defects








Port Talbot homes often hide their heat loss in plain sight. Our thermal imaging specialists carry out detailed infrared surveys across SA12, SA13 and the wider Neath Port Talbot area, using non-invasive cameras that read surface temperature changes to 0.1C. We detect cold spots, air leakage, damp patterns and insulation gaps that a normal visual inspection will miss. That matters in a town where older terraces sit beside post-war estates and newer homes at Coed Darcy. The report shows where heat is escaping, not where it merely feels draughty.
homedata.co.uk records show Port Talbot's average house price was £178,000 in May 2024, with detached homes at £289,000, semi-detached at £183,000, terraced homes at £137,000 and flats at £95,000. The same dataset shows 520 sales in the last 12 months and a +0.6% overall change, which tells us buyers are still weighing up running costs as closely as asking price. That is why a thermal survey can be useful before a purchase, after a refurbishment or once energy bills start climbing. home.co.uk currently shows new homes at Coed Darcy from £219,995, and even newer stock can hide thermal bridges around openings and loft details.

Infrared imaging lets us map temperature differences across walls, roofs, floors, windows and doors. We pick up missing or collapsed cavity wall insulation, cold bridging at lintels and floor edges, and air leaks around frames, service penetrations and loft hatches. Hidden damp often appears as a colder patch where moisture is affecting the surface temperature. Electrical hotspots and underfloor heating faults also stand out when the pattern is wrong. It is a fast way to see the building as a heat map.
The camera does not guess. It records surface temperatures, then our surveyors explain why a section of plasterboard, a chimney breast or a roof valley is behaving differently to the surrounding fabric. Thermal imaging is non-invasive and non-destructive, so we can inspect occupied homes on Albert Road, in Aberavon or near the Port of Port Talbot without opening up walls. The result is a clearer picture of where repair money should go first. That avoids chasing symptoms instead of causes.

Port Talbot has a mixed housing story. Older parts of the town and former mining communities still hold a significant number of pre-1919 homes, while many streets were built between 1919 and 1945 as terraced and inter-war semi-detached houses. After 1945, the town expanded again, leaving estates of semi-detached and detached homes from 1945-1980, followed by newer infill and regeneration schemes after 1980. Each era was built to different insulation standards, so heat loss varies from house to house. A pre-war solid-wall terrace on one street can perform very differently from a post-war semi on the next.
Construction details matter here. Many local properties are built in traditional brickwork, often red brick and render, with slate or concrete tile roofs, suspended timber floors in older homes and concrete ground floors in newer builds. Cavity walls became more common after the 1930s, but the insulation level inside them can still be patchy or missing if retrofits were done badly. Near Swansea Bay and the River Afan, wind-driven rain and moisture exposure can make damp bridging easier to spot on a thermal scan. That's where our thermal imaging specialists can separate weather-related staining from heat loss caused by a defect.
The local ground adds another layer. Neath Port Talbot includes Carboniferous rocks, glacial till, alluvium and estuarine deposits, and clay-rich zones can bring shrink-swell movement. That is one reason older homes with historic movement or cracked plaster often benefit from a thermal survey before a full repair plan is set. Properties near Aberavon, the Afan Lido area and low-lying stretches close to watercourses can also show moisture-related temperature patterns after wet weather. We use those clues to focus the next stage of investigation.
Thermal imaging turns vague bill shock into evidence. In many homes, the biggest losses show up through the roof, walls and windows, with a common pattern of 25% through the roof, 35% through walls and 15% through windows when insulation is weak or interrupted. Those figures are not a promise for every house, but they show why a cold loft hatch or a missing cavity fill can make a real difference. A patch of cold around the eaves often points to a repair that is much cheaper than replacing a whole heating system. The image tells the story in seconds.
Once the weak points are mapped, upgrades can be prioritised by impact. Loft top-ups, cavity wall repairs, draught sealing and better window sealing often move the needle faster than cosmetic changes, and they can support a stronger EPC result when the fabric is performing properly. Homes around Coed Darcy may already have better baseline insulation, yet thermal bridging at junctions and roof penetrations can still leak energy. Older terraces in Port Talbot tend to show a different pattern, with solid walls, leaky junctions and cold floors stealing comfort from the rooms people use most. The survey helps put numbers and pictures around that loss.

Choose your survey slot and tell us about the property type, whether it is a terrace on a side street in Aberavon or a detached home closer to Margam. We use that detail to plan the visit and the best scan points.
The clearest results usually come between October and March, when there is a minimum 10C temperature difference between inside and outside. That contrast lets our infrared cameras read the building fabric properly.
We ask for the heating to be on for at least 2 hours before arrival. This creates a stable temperature profile, so cold spots and leakage paths show up with more confidence.
Our surveyors carry out external and internal infrared scans, usually taking 1-2 hours depending on property size and layout. We look at walls, roofs, floors, windows, doors and problem junctions.
Each thermal image is reviewed, annotated and compared with the surrounding fabric. We explain whether the reading points to insulation loss, damp ingress, a thermal bridge or a false pattern from sun or reflection.
You get a written report with thermal images, clear explanations and repair priorities. If we spot a follow-up issue, such as a possible moisture route near a roof valley or chimney breast, we flag it clearly.
Thermal pictures use a colour scale, usually from cold blue through green and yellow to hot red or white. Cold patches do not always mean a problem, because reflections, shading, solar gain and temporary airflow can distort the picture. Our surveyors look at the whole pattern, not a single pixel, and compare each area with the building fabric around it. That matters on bright streets near Aberavon or where a wall has picked up sun on one side. A good image always needs context.
We annotate every finding so the report reads like a repair map rather than a gallery of colours. Temperature differences help us identify when a cold strip follows a lintel, a ceiling edge or a floor joist line, which often points to a thermal bridge or insulation void. We also explain when the evidence is strong enough to justify a contractor visit and when it is only a lead worth checking further. If a patch near a chimney breast is cold because of residual moisture, we say so plainly. If the same pattern is caused by a draught around a loft hatch, we say that too.
Port Talbot's housing stock throws up repeat patterns. In pre-1919 terraces, we often see poor loft insulation, cold walls and single-glazed windows that let the heat escape fast. Post-war semis from 1945-1980 can show blown cavity insulation, weak roof junctions and unsealed floor edges. Regeneration homes near Coed Darcy may look tighter, yet small gaps around service entries, loft hatches and window reveals still show up clearly on infrared scans. The common thread is simple: small defects add up.
Older homes in and around Margam, Aberavon and the streets nearer the coast can also show damp-related signatures after heavy rain or wind-driven weather from Swansea Bay. Where slate or tile roofs have slipped, or gutters and flashings have failed, the cooled patch often extends well beyond the visible stain inside. We also keep an eye on properties with a mining legacy, because old workings and local ground movement can leave hairline cracks that let in air and moisture. Listed buildings such as St. Theodore's Church and parts of the Margam Abbey complex need careful interpretation because solid masonry holds temperature differently. That gives you a practical starting point for the next survey or repair.

A thermal imaging survey can detect heat loss through roofs, walls, floors, windows and doors, along with missing insulation, cold bridging and air leakage. It also helps us spot patterns linked to hidden damp, leaking pipework, underfloor heating faults and some electrical hotspots. In Port Talbot, that is especially useful in older terraces and post-war semis where the fabric has been altered over time. The report explains what each image means, so you can see which issue needs attention first.
Our thermographic surveys in Port Talbot start from £300. The price depends on the size of the property, access to the elevations and the amount of analysis needed after the visit. For that fee, you get external and internal infrared scans, image review and a written report with recommendations. It is a modest outlay compared with the cost of ignoring hidden heat loss for another heating season.
October to March is usually the best window for a thermal survey. We need a minimum 10C difference between inside and outside so the heat loss pattern stands out clearly. Cloud cover, wind and the heating pattern inside the home all affect the clarity of the scan, which is why cooler months give better contrast. If the weather is wrong, we would rather wait than give you a soft result.
Most thermal imaging surveys take 1-2 hours, depending on the property size and how many elevations or rooms need scanning. A compact terraced house in SA12 will usually take less time than a larger detached property near Margam or a home with multiple extensions. The analysis time comes after the visit, when our surveyors review the images and prepare the report. That part is where the findings are turned into practical next steps.
Yes, thermal imaging can help reveal damp patterns and moisture ingress, because wet materials often show as cooler areas on the surface. It is very good at identifying where a leak, a failed roof detail or a cold bridge is feeding the problem. It does not replace a moisture meter or a full damp investigation, though, because a cold patch can also come from airflow or shading. We use the thermal scan to narrow the cause, then point you towards the right follow-up if needed.
The main preparation is simple: keep the heating on for at least 2 hours before we arrive. We also ask for normal living conditions, so please do not switch the heating off just before the visit or open windows unnecessarily. Access to the loft hatch, boiler area and any rooms with visible problems helps us work faster. If the property has been heavily aired out, the temperature pattern can be harder to read.
Yes, older homes in Port Talbot often benefit the most because many were built before modern insulation standards. Pre-1919 terraces, inter-war semis and post-war houses can all hide a mix of solid walls, patched retrofits and ageing roof details. Thermal imaging shows how those layers are performing now, not how they were meant to perform on paper. That makes it a practical check before you spend on repairs or upgrades.
From £80
Energy performance certificate for buyers, sellers and landlords
From £450
Checks visible defects in standard homes and newer stock
From £650
Detailed survey for older, altered or complex homes
From £850
Legal support for the move once the survey is done
Thermographic survey prices in Port Talbot start from £300. That usually covers the external and internal infrared scans, a review of the images and a written report with annotated findings and recommendations. Larger homes, complex layouts or poor weather windows can take longer, because we need the right thermal contrast and clear access to the main elevations. home.co.uk shows new homes at Coed Darcy from £219,995, while homedata.co.uk records place the town's average house price at £178,000, so a modest survey fee can protect a much larger spend.
Accuracy depends on conditions as much as camera quality. We work best when the heating has been on for at least 2 hours and there is a minimum 10C difference between inside and outside, which is why October to March usually gives the clearest results. Our thermal imaging specialists then deliver a report that shows the images, explains the temperature patterns and ranks the fixes by urgency. If a property in Aberavon, Margam or near the River Afan needs a follow-up on damp or structure, the thermal report gives a strong starting point. It saves guesswork.
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Infrared thermal imaging to detect heat loss and hidden defects
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Homemove is a trading name of HM Haus Group Ltd (Company No. 13873779, registered in England & Wales). Homemove Mortgages Ltd (Company No. 15947693) is an Appointed Representative of TMG Direct Limited, trading as TMG Mortgage Network, which is authorised and regulated by the Financial Conduct Authority (FRN 786245). Homemove Mortgages Ltd is entered on the FCA Register as an Appointed Representative (FRN 1022429). You can check registrations at NewRegister or by calling 0800 111 6768.