Standard Assessment Procedure (SAP)
Guidance on how a home’s energy performance is calculated using the Standard Assessment Procedure (SAP) methodology, which underpins the Energy Performance Certificate (EPC).
The Simplified Building Energy Model (SBEM) is the methodology used by the government to assess and compare the energy and environmental performance of non-domestic properties.
For existing dwellings, a simplified version of SAP called Reduced Data SAP (RdSAP) is used to assess their energy performance. An RdSAP assessment will use a set of assumptions about the dwelling based on conventions and requirements at the time it was constructed.