Standard Assessment Procedure (SAP)

The SAP is the Government's recommended system for energy rating of dwellings. The Standard Assessment Procedure is used for:

  • calculating the SAP rating, on a scale from 1 to 120, based on the annual energy costs for space and water heating
  • calculating the Carbon Index, on a scale of 0.0 to 10.0, based on the annual CO2 emissions associated with space and water heating.

The SAP rating is used to fulfil requirements of the Building Regulations to notify and display an energy rating in new dwellings.

The Carbon Index (CI) can be used to demonstrate compliance with Approved Document L1 (England and Wales) and Technical Standards Part J (Scotland)

SAP 2001 was published in December 2001 and operational in Scotland from 4 March 2002, and in England and Wales from 1 April 2002. (see also: update history below)

The new SAP 2005 edition is now published. Goto

The SAP2001 specification may be downloaded (free of charge) in PDF format see below... or, printed copies of the SAP specification can be obtained by calling 0845 120 7799

SAP 1998 and SAP  2001

There is a difference between the rating scales in SAP 1998 and SAP 2001. To download a description and information about how to convert ratings, click here.

Download the manual:

Download a complete copy of the manual by clicking the PDF icon below (filesize 400k)

SAP 2001

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SAP software

To download the current list of approved SAP software as a PDF file, click here (56kB)

(list updated October 2006)

Update history

Revised edition with minor corrections added 20 December 2002.

A new 2005 edition is now available here:

Click below to E-mail the BRE Environment Helpdesk