SAP Calculations show compliance with Part L* of the Building Regulations. SAP Calcs†are required by Building Control at the design stage of a new dwelling to show how the building will comply with Part L. Once built, the dwelling requires a new set of SAP calcs to show that what is built complies with Part L. At this stage we produce the as-built SAP calculations & provide the EPC (Energy Performance Certificate) based on the as-built spec. Building Control will ask for SAP calculations if your extension or conservatory has glazing that is greater in area than 25% of the extension floor area (glazing includes rooflights and glazed roofs). We show compliance by producing 2 sets of SAP calculations, one showing a ‘notional’ extension, and one showing the ‘proposed’ extension. The COâ‚‚ emissions of the ‘proposed’ extension must be no worse than the ‘notional’ extension in order to comply with Part L1B.
