How we measure energy efficiency in homes isn't working

By Freya Wise, PhD Candidate in Sustainability and the Built Environment, The Open University

If you’ve ever rented or bought a house, you’ve probably come across energy performance certificates (EPCs). These certificates, with their brightly coloured bar charts, adorn estate agents’ windows and tell prospective tenants and buyers how energy efficient their property is on a scale of A to G, with A being most efficient and G, least.

To produce these certificates for an existing home, an energy assessor visits and take measurements, noting the building’s construction and energy systems. They enter this data into software called the reduced standard assessment procedure (RdSAP),…

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