This information paper describes the background to the Standard Assessment Procedure (SAP) and its position within the Energy Performance of Buildings Directive. It outlines the SAP calculation process and the information required, with a comparison chart summarising the key differences between SAP, the Building Research Establishment domestic energy model (BREDEM) and Reduced-data SAP (RdSAP). An explanation of SAP terminology and energy performance certificates is provided, as well as a glossary and useful tips section. It also includes a comparison chart summarising the key differences between SAP, BREDEM and RdSAP.(A4, 12pp) Illustrations 6 diagrams Contents Introduction SAP 2005 calculation How the SAP 2005 calculation works Who can undertake SAP calculations? Key terminology Energy Performance Certificates explained References