The Standard Assessment Procedure (SAP) is the UK Government’s approved methodology for assessing the energy performance of residential buildings. It is used to demonstrate compliance with Part L of the Building Regulations and forms the basis of the Energy Performance Certificate (EPC) issued once a dwelling is complete.

SAP calculations assess how efficiently a home is expected to use energy, taking account of the building fabric, insulation levels, glazing, heating and hot water systems, ventilation strategy, lighting and any renewable energy technologies incorporated into the design.

By assessing these elements together, SAP provides a standardised measure of a dwelling’s energy efficiency, carbon emissions and overall environmental performance.

We undertake the SAP assessment using approved software and accredited methodologies recognised by Building Control bodies throughout England and Wales.

The assessment considers a wide range of factors, including insulation and fabric performance, glazing, airtightness, heating, hot water, ventilation, lighting, renewable technologies such as solar PV, carbon emissions and overall energy demand.

Where assessments are undertaken during the design stage, we can identify opportunities to improve compliance and potentially enhance the anticipated EPC rating before construction begins. This can often avoid costly design changes later in the project.

Only suitably qualified and accredited assessors can produce SAP calculations that will be accepted by Building Control, giving you confidence that the assessment is robust, compliant and suitable for submission.

The results of the SAP assessment ultimately feed into the Energy Performance Certificate (EPC), providing your home with its official energy efficiency rating.