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Why EPCs aren’t a good measure of home energy efficiency

1 July 2021

Energy performance certificates (EPCs) tell prospective tenants and buyers how energy efficient a property is on a scale of A to G, with A being most efficient and G, least.

The Conversation has released an article based on a new piece of research, arguing that EPCs do not provide a reasonably accurate picture of the energy performance of a home. Particular problems with EPCs as a measure of home energy use are:

  • EPCs tend to overestimate energy use for older buildings and underestimate it for newer buildings
  • EPCs assume that people heat all of their building to standard schedules
  • EPCs lack the flexibility to recommend more sensitive or bespoke alterations, such as replacing window shutters in older homes
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