Since 1 October 2008 all homes have needed an Energy Performance Certificate when built or sold. It is the responsibility of the person selling or renting a building to have a valid EPC to show to prospective buyers. The Energy Performance Certificate shows how energy-efficient the property is as a building. The certificate provides a rating of the property from A to G, where A is very efficient and G is very inefficient.
Two ratings are shown: The environmental impact rating is a measure of a home's impact on the environment in terms of carbon dioxide (C02) emissions - the higher the rating, the less impact it has on the environment. The energy-efficiency rating is a measure of a home's overall efficiency. The higher the rating, the more energy-efficient the home is, and the lower the fuel bills are likely to be.
Each rating is based on the performance of the building itself and its services (such as heating and lighting), rather than the domestic appliances within it.
This is known as an asset rating. The certificate also lists the potential rating of the building if all the cost-effective measures were installed.
The ratings will vary according to the age, location, size and condition of the building. The potential rating on the certificate will take these factors into account, and the suggested measures will be tailored so that they are realistic for the particular building.