Thermographic Survey in Truro

Truro's housing stock is mixed, and that matters. Census 2021 data shows detached homes at 28.5%, semi-detached at 29.8%, terraced homes at 20.9% and flats or maisonettes at 20.1%, so our surveyors deal with everything from compact flats to larger family houses. Victorian and Edwardian homes in the Cathedral area often use solid walls, while later properties may have cavity wall construction, rendered finishes and slate roofs. A thermal survey helps separate age-related heat loss from faults caused by later alterations, which is useful in a city where buildings have been adapted many times.

Local conditions add another layer. Truro sits over Devonian slates and sandstones, with granite in places to the west, and superficial deposits along the Truro River can influence moisture behaviour. High rainfall, tidal watercourses and surface water flooding can leave cold patches that look like thermal problems, but often point to moisture, saturated masonry or failed drainage. Rendered external finishes are common across Cornwall, and they can hide insulation defects until a thermal image exposes the pattern. That is why our surveys are useful in conservation areas around the Cathedral, Lemon Street and Boscawen Street, where the fabric must be understood before any works begin.

Newer homes need checking too. Home.co.uk listings show active developments such as Maiden Green in TR1 3XX and Tregurra Park in TR1 1RH, both from £299,995, alongside Higher Newham Farm in TR1 2ST with 2, 3, 4 and 5 bedroom homes. Modern construction should perform well, yet rapid build phases can still leave voids, workmanship gaps or incomplete insulation at junctions. We use thermal imaging to confirm where the shell is behaving as expected and where a hidden defect is wasting energy from day one.

Thermal images use a colour scale, usually from cold blues through to hot reds and whites, to show surface temperature differences. A blue patch on a ceiling in a terrace near Boscawen Street can indicate missing insulation, while a red band around a window may point to heat loss or air leakage. The colour alone is never enough, so we read the image alongside the building form, the weather and the heating pattern in the property. That is why a trained surveyor matters more than the camera on its own.

False readings can appear if the sun has warmed a wall, if a shiny surface is reflecting nearby heat, or if a recent shower has changed the skin temperature of the external fabric. In Truro, where rendered walls and slate roofs are common, reflections and damp surfaces can both create misleading hotspots if the image is not interpreted properly. We annotate each image to explain what the colours mean, where the evidence is strong and where we need to be cautious. The goal is clarity, not a page of technical jargon.

Once the images are analysed, we group the findings into priorities that a homeowner can act on. A cold strip at the eaves may be a straightforward loft insulation gap, while a cooler patch on a solid wall in a Victorian house near Lemon Street can suggest damp or thermal bridging. If we spot a consistent pattern across a post-war estate or a newer home at Tregurra Park, we explain whether it points to insulation, workmanship or moisture. The report is built to answer one question: where is the building losing performance, and what should be fixed first?

Our thermographic survey prices start from £300, which gives Truro homeowners a clear route into infrared analysis without opening up the building. The fee covers external and internal scanning, image review, annotation and a report that explains what each thermal pattern means. For a flat in TR1 or a compact terrace near the city centre, that can be a useful first step before any insulation, ventilation or repair work is planned. A thermal survey is often chosen before spending money on upgrades, because it shows which parts of the building matter most.

Costs stay sensible because the survey is focused and non-destructive. A standard building survey in Truro can run from £600 to £800 for a 3-bed semi-detached property, or £750 to £1,000+ for a 4-bed detached home, so thermal imaging is often used as a targeted add-on when energy loss is the main concern. The best value comes from running the survey in the cooler months, from October to March, when we can read the building under the right contrast. That is when the camera picks up the clearest edge lines, leaking windows and missing insulation.

Accurate results also depend on preparation. The heating should be on for at least 2 hours beforehand, and we need a minimum 10C difference between inside and outside for a reliable image set. In Truro's mixed housing stock, from Victorian terraces around Lemon Street to newer homes at Maiden Green and Tregurra Park, that preparation helps us separate old defects from normal winter behaviour. The report then gives a practical plan for the next repair, not just a set of pictures.