An Energy Performance Certificate is required for all residential properties sold or rented after 4 January 2009 and provides information on the current energy efficiency of the property and makes recommendations on ways the efficiency can be improved. Once obtained, the energy performance certificate lasts for ten years. From 4 January 2009 all new tenants are required to be provided with an EPC by the landlord. Where an existing tenancy is extended, an EPC does not require to be provided.