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SAP stands for Standard Assessment Procedure.

A SAP Calculation is required by Building Regulations and is the only Legal Government System in the UK that evaluates the energy rating for a property. A Standard Assessment Procedure of a home's energy efficiency (SAP) is based on a calculation that ranges from 1 to 100.

A score of over 100 would indicate that the house is a net energy exporter and has zero energy cost. A score of 1-10 means that the property is extremely inefficient and needs improvements.

The SAP calculations are based on the estimated energy costs and fuel costs of a property.

They take into account various factors such as;

• The building and its construction.
• The heating and hot water system.
• The internal lighting of the property.
• The use of renewable technologies and energy sources.

According to the Building Regulations, a SAP Calculation and a Predicted Energy Performance Certificate are required for new dwellings prior to the commencement of work. The two main formats of SAP calculations are L1A (new buildings) and L1B (extensions & conversions). The purpose of these is to produce an updated or new Energy Performance Certificate.