SAP Calculations

What is SAP?

The Standard Assessment Procedure (SAP Calculation) is the UK Government’s approved methodology for calculating the energy performance of new built or converted dwellings.

A SAP is carried out to show compliance with the Building Regulations (Approved Document L1A or Approved Document L1B) when undertaking a new domestic build, converting an existing property into any number of dwellings, or justifying glazing in a new extension or a conservatory open to the house. SAP Assessments are also sometimes called SAP Calculations, SAP Ratings or SAP Certificates. It is from these calculations that an EPC is produced.


As part of the Building Regulations in England, Wales and Scotland, every new-build dwelling is required to meet compliance against regularly updated energy efficiency standards. For a residential building, a Standard Assessment Procedure (SAP) Calculation is used to show this compliance.

A SAP Assessment is undertaken from drawings drawn to scale. To undertake the assessment plans, sections and elevations are usually required. Each of the elements (floor, walls, roof and windows) are measured and this information is input into our SAP software along with details of insulation, heating and hot water details, details of renewable technology and anything else which could affect the energy consumption and carbon emissions of the building.

What is an EPC?

EPC stands for Energy Performance Certificate

Any dwelling created after 1st April 2008 must have an EPC certificate produced using full SAP methodology.

This includes: New Builds, Conversions and when the number of dwellings within a property has changed i.e. A house changed into 2 flats. 
A full SAP EPC can be used for sale or rent in the same way as the usual (RdSAP) version, and is valid for 10 years.

Why Pro Sustainability?


We collaborate with your design team to reach optimum solutions
We study several options to meet the guidelines
We can advise on more holistic approach such as thermal comfort or energy demand if required

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