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SAP is the Government's Standard Assessment Procedure for Energy Rating of Dwellings. SAP 2005 is adopted by government as part of the UK national methodology for calculation of the energy performance of buildings. It is used to demonstrate compliance with building regulations for dwellings - Part L (England and Wales), Section 6 (Scotland) and Part F (Northern Ireland) - and to provide energy ratings for dwellings. SAP Logo

SAP 2005 specification with 9.83 update

Download as PDF (updated 18 March 2010)

SAP 9.81 technical changes (PDF)

SAP 9.82 technical changes (PDF)

Approved SAP 2005 software

Download the current list of approved SAP 9.81 software (list updated 2 August 2010)

Download the list of approved SAP 9.80 software (list updated 22 November 2007)

Approved RdSAP software

Download the current list of approved software for RdSAP 2005 v9.83 as a PDF file

(list updated 20 July 2010)

Appendix Q procedures

Procedures have been defined for using test data for a number of systems, including mechanical ventilation, flue gas heat recovery, waste water heat recovery and heat pumps.

For details see Building Energy Performance Assessment - Support website

Large dwellings over 450 m2

The limitation on SAP usage for Part L compliance for dwellings with total floor area of 450 m2 or more has been removed and SAP, rather than SBEM, should be used for Part L compliance for such dwellings.

Enquiries to

SAP 2009 has been published, see

SAP 2001 is now defunct. Its documentation is retained for historical purposes at