What are Energy Performance Certificates (EPCs)

Since 1st October 2008 an Energy Performance Certificate (EPC) has been required for every sale or letting of a non-domestic (industrial, office, retail, leisure) property apart from a small number of exceptions (See below). An EPC is an assessment of a building’s existing and potential energy efficiency

These assessments are carried out by qualified assessors who appraise the exact dimensions of walls, doors and windows, age, use, lighting and HVAC (Heating, Ventilation and Air-Conditioning) along with their associated controls. A 3D CAD model is then created and the various U-values applied. The use of the zone, lighting and HVAC (Heating, Ventilation and Air Conditioning) is then added in and the final rating calculated expressed as A to G with A being optimal.  

For more information from the Government please read their guide which can be downloaded free here:-

A guide to energy performance certificates for the marketing, sale and let of dwellings (publishing.service.gov.uk)