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Welcome back to iSAP,

The government is preparing a new version of the Standard Assessment Procedure (SAP) for the energy rating of dwellings. In July, BRE, on behalf of the government, published the written specification describing the largely complete methodology, known as SAP 10.0. However, this will be subject to some further adjustments ahead of consultation on its official adoption.

This website hosts a software implementation of SAP 10.0. The purpose of providing this is to allow stakeholders to see how the updated methodology works in practice, since it can be difficult to understand the implications just by looking at the equations and guidance in the specification document. It is only a demonstration tool and should not be used for any official calculations. SAP 2012 continues to be the current method for all official calculations. Furthermore, there are likely to be further changes to the methodology before it is finalised.

We expect to publish an updated methodology (specification and software tool), known as SAP 10.1, to accompany the Part L consultation for England in due course.

To use the tool new users need to register, then log in on subsequent visits. Following registration, it is suggested that new users read the quick tour guide before getting started.