SAP stands for ‘Standard Assessment Procedure’ and is the government’s method for calculating the energy performance of dwellings. SAP Calculations are a Building Regulations requirement for all new residential developments, conversions and some extensions.
SAP calculations are only necessary for residential properties. SAP Calculations are required by Part L (England & Wales), Section 6 (Scotland), Part F1 (Northern Ireland) of building regulation standards. These documents are concerned with the conservation of fuel and power. In England, your SAP calculations measure two elements; the Dwelling Emission Rate (DER) and Dwelling Fabric Energy Efficiency (DFEE).