The Energy Performance Certificate is broadly similar to the certificates found on many domestic appliances and is a compulsory document in the Home Information Pack.

A Certificate for a building gives the building an asset rating based on its energy efficiency, but doesn't take into account how the home is used by the occupiers. The Certificate will give the building a rating from A to G. An A rating shows it's very efficient, meaning lower fuel bills, while G is inefficient, meaning higher fuel bills. The Certificate will also show the building's environmental impact by indicating its carbon-dioxide emissions.

There will also be recommendations for cost-effective actions to improve the building's rating. The potential rating is based on all the recommendations being implemented.

An Energy Performance Certificate will be required for most homes marketed for sale. There are a few limited exceptions.