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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. The government is also in the process of consulting on changes to the Building Regulations energy efficiency standards for new dwellings. BRE published version 10.1 of the SAP specification to support the consultation process. 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, subject to the ongoing elements being consulted on.

The most recent change to the tool was made in February 2021, to update the compliance metrics to align with the government’s response to the Future Homes Standard consultation.

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.