Home thermal-imaging surveys

Our internal thermal-imaging surveys aim to improve the comfort and energy efficiency of your home, so you save money on your bills and to reduce your climate impact.

Our survey process is based on the unique Energy Tracing methodology developed by Brian Harper in Malvern. He has been working with thermal imaging for over 45 years and had developed his system while surveying about 400 homes over five years. The C.H.E.E.S.E. Project has adapted his system and licensed its name, developing its own software, training, and now hardware over a further five years in Bristol.

How it works

We perform surveys in the winter so that when a house is heated there is a large difference between the temperature inside the house compared to the outside.

An Energy Tracer will come at the prearranged time. Firstly, a large extractor fan is fitted to an external door and run continuously to reduce the pressure inside the building. This causes cold air to be drawn in though any gaps. As we work through each room in the house we use the thermal imaging camera to look for cold spots which point to thermal faults in the fabric of the building. These may be caused by gaps to the outside through which draughts are pulled by the fan, or by poor thermal insulation from cold bridging or missing insulation etc.

As the householder, you are involved directly with the survey by accompanying the surveyor to see first hand how heat moves around your home and where it is lost. The entire survey is recorded as a video with audio of the surveyor's commentary and any discussions you might have with them. The video is given to you afterwards on a USB memory stick, so you can review the findings at any point.

Following the survey, a briefing is carried out on the main problems that were identified and how they might be remedied, but we cannot offer this as professional advice. You must always consult an expert to determine the best way forward. We will record your current energy use by looking at your gas and electricity bills (you will need to find them in advance).

Because we are continuously developing the CHEESE Project and its approach, we will ask you to complete a short questionnaire after the survey to obtain feedback and to learn how effective the survey was for you. We will follow up again after a month and after a year to see if your energy use has changed!


Please note: while we are holding our 2019-20 pricing offered to those who booked surveys which had to be postponed due to the Covid pandemic, we have had to raise our prices by about 30% for this season so that we can operate on a sustainable not-for-profit basis without grants.

Below are our prices for various sizes of home. Please note that bedrooms includes any converted to work-from-home or studio use.

Free surveys are available through WHAM for people experiencing poor housing conditions and those in fuel poverty. Please just get in touch if you would like to refer yourself or someone else for a free survey.

Building type Survey time Charge (Bristol) Charge (Bath)
1-2 bedrooms 2 hours £135 £195
3 bedrooms 2.5 hours £195 £255
4 bedrooms* 2.5 to 3 hours £240 £300
8 or more rooms in total* Over 3 hours £260 £320
12 or more rooms in total* Over 3.5 hours £320 £380
Commercial surveys for housing associations, councils etc.
(Additional charge for a written report
Variable £300

Our prices for surveys in Bath include a supplement of £60 to cover travel costs to and from Bristol.

* We generally only survey large houses at weekends, though there may be some limited availability for surveying large houses on other days.

Each year we train new Energy Tracers (ETs) and they learn on the job, supervised by more experienced ETs in order to gain their certificate. If you have your survey in November or December it may be a 'training survey'. While this may take a little longer you will have the benefit of both ETs experience and their technical and observational skills. We will let you know in advance if it will be a training survey.

Apply for a survey now!

Cancellation policy

If your survey is cancelled less than 72 hours (3 days) prior to your survey there will be a £100 cancellation fee. If you rebook your survey for a different date in the same season, £50 of this will be credited against your new booking.