The key regulations governing Energy Performance Certificates (EPCs) are the Energy Performance of Buildings (England and Wales) Regulations 2012, SI 2012/3118 (EPC Regs 2012), as amended, and the Building Regulations 2010, SI 2010/2214, which implement the requirements of the recast Energy Performance of Buildings Directive 2010/31/EU (recast EPB Directive). The EPC Regs 2012 apply to all buildings across England and Wales. An EPC is required when: • an existing building is sold or rented out (EPC Regs 2012, reg 6) • a building under construction is finished (Building Regulations 2010, SI 2010/2214, reg 29(1)(a)) • after refurbishment when there are greater or fewer separate parts of the building and the modification includes the provision or extension of fixed heating, air conditioning or mechanical ventilation systems (Building