Thermographic Survey in Bath and North East Somerset

Bath and North East Somerset has a housing mix that rewards careful inspection. Bath Stone, lime mortar and solid masonry walls are common in the older streets, and those materials behave differently from modern cavity walls. Heat moves through the fabric in a slower, less predictable way, so one faulty repair or a blocked loft vent can affect an entire elevation. UNESCO-listed streets and a high concentration of listed buildings also mean many homes cannot be altered casually, which makes diagnosis before work even more useful.

The city stock leans heavily towards terraced homes and flats, so many properties share party walls, roof junctions and service runs. That matters in a district where 66% of households are owner-occupiers, 13 schools are rated Outstanding, and there are nine independent preparatory schools drawing attention to home location and condition alike. Bath Spa railway station, the A4 corridor and the congestion charging zone introduced in March 2021 all shape how people move around the area, yet the bigger day-to-day issue for many owners is keeping heat inside once winter settles in. A thermal survey gives a hard look at the parts of the home that are usually hidden.

Wider Bath and North East Somerset also includes later homes in the BA3 part of the district, where newer build fabric can still show leakage around penetrations, loft hatches and poorly fitted insulation. Clay-rich soils can add movement risk, while the River Avon and surface water flooding create damp conditions that show up as colder patches on internal surfaces. That is useful information for retrofit planning, because a cold bridge near a skirting board may come from moisture, settlement or both. Our surveyors use the images to separate those causes rather than guess.

A thermal image works on colour contrast, not decoration. Cooler surfaces usually appear blue or purple, while warmer areas move through red, orange and white, depending on the camera palette. In a Bath townhouse with thick stone walls, a pale strip near an internal corner can show a cold bridge, while a dark patch above a ceiling line can point to missing loft insulation. The image only tells part of the story, so our surveyors read the whole surface, not one bright spot in isolation.

False readings can come from several places. Sunlight on a south-facing façade, reflections from shiny radiator foil, a recently opened window or heat from an appliance can all distort the picture. Bath's slopes, courtyards and river valley setting can make solar gain uneven across a row of homes, so timing matters as much as the camera itself. Our specialists compare like-for-like surfaces and take note of weather, internal heating patterns and recent rain before making a call.

Every report should explain the image in plain English, and ours does that with annotations beside each frame. We describe what the colour pattern means, where the temperature difference sits and what work is likely to help, from loft insulation repairs and draught proofing to secondary glazing or ventilation changes. That is especially useful in listed properties, where lime mortar, Bath Stone and original joinery need sympathetic treatment. A good thermal report points to the fix that suits the building, not just the coldest pixel.

Thermographic surveys start from £300, and the final fee depends on property size, access and complexity. A compact flat can be quicker to scan than a multi-storey Bath townhouse with attics, extensions and outbuildings, so the time on site affects the price. Our thermal imaging specialists include external and internal scans, annotated images and practical recommendations in the report. That gives you a proper record of where heat loss sits, not just a few pictures.

Best results come from good survey conditions. The heating should be on for at least 2 hours, the property needs at least a 10C difference between inside and outside, and the visit is usually planned between October and March. Dry weather helps too, because wet masonry, rain-darkened roofs and bright sun can mask the true temperature pattern. In Bath and North East Somerset, that matters on Bath Stone façades and on walls near the River Avon where moisture can make a cold patch look more serious than it really is.

Turnaround is usually straightforward once the images are reviewed and annotated. The report explains what each thermal pattern means, what is likely causing it and which improvement will give the best return in comfort and energy use. For a district with average homes around £406,000, detached properties at £705,000 and flats at £239,000, accurate diagnosis is money well spent before insulation, glazing or ventilation work begins. A proper thermal survey helps the next step feel informed rather than speculative.