An EPC, or energy performance certificate, provides information on the energy efficiency of both domestic and commercial properties. The energy efficiency of a building is based on a scale of A-G, the closer a building is to a rating of A the better the buildings energy efficiency. All homes and commercial properties being bought, sold or rented require an EPC. As long as the building in question has a roof, walls and uses energy to condition an indoor climate an EPC is an essential and legal requirement. The EPC report is supplied alongside a recommendations report which states various ways in which to reduce energy use and carbon dioxide emissions and therefore increase the overall energy efficiency of the building/dwelling.