Thermographic Surveys are usually conducted around second-fix stage and can quickly identify problem areas inherent in the building construction and fabrication.

Surveys are normally carried out at night or early morning, when environmental conditions are suitable and the effects of solar loading effects have disappeared. Also, it is important that there is at least a 10°C difference between internal and external temperatures of the building, which means heating systems should have been in operation for at least 8 hours prior to the survey.