Standard Assessment Procedure

The Standard Assessment Procedure (SAP) is the UK Government’s National Calculation Methodology for assessing the energy performance of dwellings. It is used to facilitate various national, devolved and local government policies including Building Regulations and for the production of Energy Performance Certificates (EPCs).

SAP was first published in 1993, but has since been updated regularly, with new versions published in 1998, 2001, 2005, 2009 and 2012. SAP 10 came into use from June 2022 in England, then in Wales and Scotland later in the year.