The English House Condition Survey (EHCS) reports for 1996, 2001 and 2004 give details of average SAP ratings for dwellings in England, broken down by dwelling type, age and tenure. Copies of these reports are available in the Library of the House, or from the Communities and Local Government website at http://www.communities.gov.uk/ehcs
There is no specific SAP rating required by the decent homes standard. However, in order for a home to be decent it must have both efficient heating and effective insulation, and must be free of category 1 hazards under the housing health and safety rating system, including hazards from cold.
An SAP rating of less than 35 (using the 2001 SAP methodology) has been established as a proxy for the likely presence of a category 1 hazard from excess cold.