All homes being sold require an Energy Performance Certificate (EPC). The EPC is broadly similar to the labels now provided with domestic appliances such as refrigerators and washing machines.
Its purpose is to record how energy efficient a property is as a building. The certificate provides a rating of the energy efficient and carbon emissions of a building from A to G, where A is very efficient and G is very inefficient.
EPCs are produced using standard methods with standard assumptions about energy usage so that the energy efficiency of one building can easily be compared with another building of the same type.
This allows prospective tenants to see information on the energy efficiency and carbon emissions so they can consider energy efficiency and fuel costs as part of their investment.
An EPC is always accompanied by a recommendation report that lists cost effective and other measures to improve the energy rating of the home. The certificate is also accompanied by information about the rating that could be achieved if all the recommendations were implemented.