Where the obligation for an EPC is triggered in respect of a mixed use building: • a separate EPC is required for each dwelling within the building, and • whether or not a single EPC can be used for the remainder of the building depends on whether the building has a common heating system, and/or conditioned communal space An energy performance certificate (EPC) is required whenever a building is erected, sold or let. It may also be required when a building is refurbished. The requirements for an EPC: • in relation to the sale, letting or marketing of a building, are set out in and the Energy Performance of Buildings (England and Wales) Regulations 2012, SI 2012/3118 (EPC Regulations) • in relation to construction or refurbishment of a building, are set out in the Building Regulations 2010, SI 2010/2214 (Building Regulations) For more information on when an EPC is required, see our subtopic: Energy performance certificates and minimum energy efficiency requirements (MEES)—overview. Different assessment criteria