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Welcome to iSAP

The government is preparing a new version of the Standard Assessment Procedure (SAP) for the energy rating of dwellings. On 1st October, the government published a consultation which includes proposed changes to the Building Regulations energy efficiency standards for new dwellings. To coincide with this, BRE published version 10.1 of the SAP specification, for consideration alongside the consultation. The consultation documents can be found here and the latest SAP documents can be found here.

This website hosts a consultation software implementation of SAP 10.1. The purpose of providing this is to help stakeholders to see how the updated methodology and the proposed regulatory changes will work in practice. 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 may be further changes to the methodology when it is finalised, following the consultation.

Please note that a change to the calculation was made on 14th November. This was due to the ‘Option 2’ compliance targets being set using a notional building with more PV than was intended which gave harder targets for dwellings with more than 1 storey. Re-running assessments made before that date will now show the correct (lower) targets.

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.



The isap.org.uk website for the iSAP software was created by BRE.