Standard Assessment Procedure Calculations
(SAP CALCs)
SAP 10 is the UK Government’s latest method for assessing the energy performance of residential buildings, replacing SAP 2012. It provides a more accurate reflection of modern energy use and is required to demonstrate compliance with Part L of the Building Regulations for new builds and conversions. SAP 10 calculations determine a dwelling’s EPC rating and measure energy consumption, heating demand, and CO₂ emissions.
Key updates in SAP 10 include:
- Reduced carbon factors for electricity to reflect cleaner power generation
- Improved modelling of heat pumps, solar PV, and other low-carbon technologies
- Updated lighting and appliance efficiency metrics
- Regional weather data for more accurate heating and cooling predictions
Verdant Eco's qualified assessors provide SAP 10 calculations from design through to final certification, ensuring full compliance and helping you achieve strong energy efficiency outcomes.






