Thermographic Survey in Leicester

Much of Leicester's inner-city housing stock dates from the Victorian and Edwardian era, when the city expanded rapidly on the back of its shoe, textile, and hosiery industries. Streets of solid red brick terraces in Highfields, Spinney Hills, Belgrave, and St Mathews were built with 215mm solid walls and no cavity insulation - construction that was standard at the time but creates significant thermal performance challenges today. Heat loss through these walls can account for more than a third of total energy consumption in an unimproved property, yet without infrared imaging the worst-affected sections remain invisible.

Solid brick construction also absorbs and retains moisture from rainfall and ground contact. East Midlands rainfall and Leicester's clay-heavy substrates combine to drive moisture into outer brick faces and allow it to migrate inward through the wall mass, particularly where mortar joints have opened due to years of thermal movement. Infrared cameras detect the temperature differential created by moisture within the wall - typically 1 to 3 degrees Celsius cooler than the surrounding dry masonry - identifying exactly which sections are affected before a buyer proceeds to exchange.

Many Leicester terraces still contain original Victorian features including single-glazed sash or casement windows, uninsulated suspended timber ground floors, and loft spaces with minimal insulation. These create cold bridges and draught pathways that show up clearly on thermal images. Suspended timber floors are a particularly common finding in Leicester's inner-city streets - cold air from the underfloor void migrates upward through gaps between floorboards, reducing room temperatures and increasing heating costs. Annotated thermal images of these floors give buyers documented evidence for both price negotiations and future improvement planning.

Leicester also has a high proportion of properties in multiple occupation and a substantial buy-to-let market, particularly in areas around both universities. Landlords commission thermographic surveys to document heat loss and insulation status ahead of minimum energy efficiency standard (MEES) compliance deadlines, and to identify any moisture ingress issues that could affect tenants or lead to disrepair claims. In one recent survey commissioned for a Spinney Hills terrace ahead of a MEES compliance review, our thermal images identified that retrospectively-fitted cavity wall insulation had settled and left voids covering over a third of the external wall area - a finding that qualified for a cavity top-up grant and resolved the EPC shortfall at no cost to the landlord. Our reports are formatted to meet the requirements of local authority housing departments and letting agents who request thermal evidence for compliance purposes.

Leicester's geology is characterised by Triassic Mercia Mudstone and associated clay formations that underlie the city and create a moderate to high shrink-swell risk across much of the built area. This clay substrate swells during wet winters and contracts during dry summers, generating ground movement that can open cracks in walls, floors, and foundations over time. These cracks become cold air and moisture pathways that register clearly on thermal images, giving buyers early warning of ground movement issues that merit structural investigation.

The River Soar runs through the centre of Leicester and presents a tangible flood risk to properties in low-lying areas of the Riverside, Belgrave, and North Evington districts. Alluvial deposits - clay, silt, and sand - along the river corridor compound the shrink-swell risk and maintain elevated water table conditions year-round. Moisture from flood events can persist inside wall cavities, beneath screed floors, and within suspended floor voids long after visible floodwater clears. Infrared scanning identifies this residual moisture at any stage, providing buyers with documented evidence of past water ingress that sellers may not have disclosed.

Pipe leaks within floor screeds and wall chases are another frequent finding in Leicester surveys. Older terraced properties retain original cast iron soil pipes, galvanised water pipes, and in some cases lead supply pipes that are approaching the end of their service life. A slow leak beneath a solid screed floor creates a warm moisture signature that spreads progressively across a wide area without any visible sign at surface level. Our thermal survey identifies the heat differential that running water creates, directing investigation to the precise location rather than requiring excavation of the entire floor.

Leicester has pockets of former industrial land, particularly in the Soar Valley corridor, that have been redeveloped for residential use over recent decades. Brownfield developments on former factory sites can present localised ground contamination and elevated moisture in made-up ground. Our thermal surveys check all accessible ground-floor and basement wall surfaces for moisture intrusion patterns that may indicate contaminated or saturated fill material beneath the slab, and our reports flag any findings that suggest further ground investigation is warranted.

Leicester's new build market is active across the city and its outer suburbs. Waterside by Keepmoat is one of the most prominent developments, located on Soar Island in Leicester city centre, offering 1 and 2 bedroom apartments alongside 3 and 4 bedroom houses. The development sits within the River Soar corridor, making a thermographic survey particularly valuable for assessing moisture risk from the adjacent waterway and confirming that the building envelope is correctly sealed. Plumplot data records 595 newly built property sales across the Leicester postcode area in 2025, with an average new build price of £371,000 in Leicester city.

Builder defects in new builds across Leicester include missing or displaced cavity wall insulation, poorly sealed service penetrations in the external envelope, and incomplete air barriers at roof junctions. These defects are invisible to a standard snagging inspection and only become apparent once the property is occupied and heated. Our post-completion thermographic surveys identify these issues during the two-year defect liability period, when developers remain contractually bound to remedy problems at no cost to the buyer. Waiting beyond this period means the buyer meets the full correction cost.

Underfloor heating is increasingly common in Leicester new builds, particularly in the ground floor slabs of apartments and larger houses. We produce a complete circuit heat map of every underfloor heating system we inspect, confirming that all pipe runs are operating at design temperature and identifying zones with reduced output caused by air locks, partial blockages, or screed thickness variations. These findings are issued in a format that developers and heating engineers can act on directly, reducing the back-and-forth that often delays defect resolution in the post-completion period.

Our Leicester thermographic surveys are conducted with FLIR cameras calibrated to detect surface temperature differences of 0.1 degrees Celsius. Our surveyors hold ISO 18436:7 thermographic certification - the internationally recognised qualification for thermal imaging practitioners - and surveys are conducted in compliance with BS EN 13187, the European standard for assessing thermal performance of buildings. Every accessible wall surface is inspected, including all external elevations from inside the property, internal walls adjacent to unheated spaces such as garages, utility rooms, and loft areas, and party walls shared with neighbouring properties. Ground floors, ceiling surfaces adjacent to uninsulated spaces, and roof access points are all included in the standard inspection scope.

We inspect the electrical consumer unit and all accessible wiring runs for thermal overheating - a finding that appears in a meaningful proportion of Leicester surveys, particularly in older Victorian and Edwardian properties where original wiring runs have been extended or overloaded over the decades of subsequent ownership. Electrical findings in Leicester surveys have included overloaded circuit breakers, deteriorated neutral connections, and extended ring mains with hot spots at junction points. For properties with gas central heating, we also check visible pipework and radiator connections for leaks.

Pricing for our Leicester thermographic survey starts from £495, covering all property types from city centre flats to larger suburban detached homes. The inspection requires the property to be heated to normal living temperature for at least 24 hours beforehand, with an internal-external temperature difference exceeding 10 degrees Celsius for reliable results. Leicester's East Midlands climate meets this condition reliably from October through to April. Our inspectors are available across all Leicester postcodes seven days a week, with full written reports delivered electronically within 24 hours of every survey.