SAP is used to produce an Energy Performance Certificate. These are required by law to be provided to owners or tenants of new homes.
SAP is the Government’s Standard Assessment Procedure for calculating the energy rating of homes. SAP is a compulsary element of Part L of the Building Regulations, meaning that all new homes and extensions are required to have a SAP rating. The SAP rating is established though a SAP calculation which will determine the standard of energy efficiency achieved.
SAP is a whole building energy calculation and looks at:
The size of the property
Type and size of openings (doors and windows)
Provision of heating, lighting and hot water
EPCs are legally required for all homes, whenever they are built, rented or sold. As legal documents, EPCs can only be produced by accredited energy assessors.
EPCs record how energy efficient a property is as a building and provide performance ratings from A-G – similar to the labels commonly seen on household appliances such as freezers and washing machines.
EPCs are issued after the property is built, and are produced using standard methods and assumptions about energy usage so that the energy efficiency of one building can be easily compared with another of the same type. This allows prospective occupiers to consider energy efficiency and fuel costs before committing to a property.