Energy Performance Certificates were introduced by the Government as part of the European Energy Performance of Building Directive (EPBD) which all member states must adopt. The Energy Performance Certificate (EPC) is intended to inform potential buyers or tenants about the energy performance of a building, so they can consider energy efficiency as part of their investment or business decision to buy or occupy that building. The certificate provides energy efficiency A-G ratings and recommendations for improvement. The ratings - similar to those found on products such as fridges - are standard so the energy efficiency of one building can easily be compared with another building of a similar type. Since October 2008 all properties - homes, commercial and public buildings - when bought, sold, built or rented need an EPC. Larger public buildings also need to display an energy certificate” Challengers can provide EPC’s for existing homes and they are carried out by a qualified Domestic Energy Assessor (DEA)