Standard Assessment Procedure (SAP)
SAP is the Government's Standard Assessment Procedure for Energy Rating of Dwellings. SAP 2005 is adopted by government as part of the UK national methodology for calculation of the energy performance of buildings. It is used to demonstrate compliance with building regulations for dwellings - Part L (England and Wales), Section 6 (Scotland) and Part F (Northern Ireland).
The implementation of the new building regulation means that SAP is the only assessment available for new dwellings.
The SAP rating is based on the energy costs associated with space heating, ventilation and lighting, less cost saving from energy generating technologies. It is adjusted for floor area so that it is essentially independent of dwelling size for a given built form.
The SAP is now expressed on a scale of 1 - 100, 1 represents a poor standard of high running cost energy efficiency while a SAP of 100 represents zero energy costs.
The Environmental Impact Rate (EIR) is based on the carbon dioxide (CO2) emissions associated with the space heating, water heating, ventilation and lighting.
Dwelling CO2 Emission Rate (DER) is similar to the EIR, it is equal to the CO2 emissions per M2 of the floor area and the DER is used for the purpose of building regulation compliance.
The calculation is based on the energy balance taking into account a range of factors that contribute to energy efficiency.
Part of our service is providing the U-Value calculations that co-inside with the SAP calculations. We offer advice to ensure compliance with Building Regulations.