An Energy Performance Certificate (EPC) provides an energy efficiency rating in relation to a property's running costs. It is a legal requirement before a building can be sold or let. The energy efficiency rating reflects the potential energy performance of the property itself (the fabric) and its services and is measured on a scale of A-G. The most efficient energy homes will have an A or B rating, while the least efficient will be rated at level G. The Certificate will include the current rating of your home together with the potential rating after any improvements have been made.