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“The UK is still flying blind on home energy performance. And it doesn’t have to.” We don’t know how most homes in the UK really perform.Today, as the UK government considers its Warm Home Plan, we launch a new Policy Brief, explaining how we can move from today’s survey-based system to a better approach to measuring the energy performance of homes.

For decades, the UK has made decisions about home energy performance based on predictions, not reality. EPCs and survey-based models were never meant to tell us how homes actually perform in reality, they couldn’t see defects nor understand true performance — yet we use them to decide where billions of pounds go, how heat pumps are sized, whether new builds meet standards, and how homeowners make upgrade decisions. That era can now end.

This KES Briefing Note explains the methodology that KES used to calculate a KES HTC 95% confidence interval at +/ - 7.3%.

This KES Briefing Note provides a review of how to find an HTC (Heat Transfer Coefficient) from models which estimate energy consumption.

This KES Briefing Note suggests an auditing mechanism that could be developed to support the use of SMETER technologies across a range of energy efficiency policies.