Energy Performance Certificate regulations require that everyone who either buys or newly rents a property whether residential or commercial, be informed of the calculated energy usage of same. This is done by an Energy Performance Certificate (EPC). It is a legal requirement for you and your agent to provide an EPC to prospective buyers and tenants when your dwelling or premises is marketed for sale or to let. The certificate tells you which energy band your building falls into. It uses a scale of A to G, similar to labels on domestic white goods. EPCS are valid for 10 years and will be held on a national register.