Standard Assessment Procedure (SAP) measures the energy performance of a building to comply with the Part L building regulations. A SAP is carried out at the design stage of a new build of a residential property. A SAP calculation produces a Projected Energy Assessment (PEA) which details how much energy a new home will use. This is translated into a more user-friendly Energy Performance Certificate (EPC), which forms one part of the government's new Home Information Pack (HIP).
The SAP is the single method of compliance with Part L Building Regulations (2006) and takes the notional carbon footprint calculation of a house from the 2002 Part L regulations and specifies that a new build house must achieve a 25% reduction in carbon use to comply with current regulations. So, if a house emitted 100 tonnes of CO2 in 2002, a house built after the introduction of Part L 2006 must emit 75 tonnes at the most to receive a SAP certificate. This is known as the Target Emission Rate (TER).
Upon completion of construction of the building, a SAP assessor will review the property to ensure that products and techniques specified at design stage have been incorporated into the build. They will then calculate the carbon footprint of the building to ensure the TER has been met. The reading recorded in the building upon completion is known as the Dwelling Emission Rate (DER), and should this be lower than or equal to the TER, the building will receive a SAP certificate. A SAP assessment can also be carried out on existing properties to enable the development of detailed strategies to ensure the refurbishment project can achieve the desired aim. For example a 60% reduction on CO2 compared against the identified base case.
A SAP report produces a report for the consumer highlighting the energy cost of running the measured dwelling, profiles the dwelling into the ratings band which is also used for standard EPCs, and the CO2 emitted.