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Welcome to the Building Energy Performance Assessment support website

This website supports UK building energy performance assessments produced using:

  • Standard Assessment Procedure for Energy Rating of Dwellings (SAP)
  • Reduced Data SAP (RdSAP), which is used to assess existing dwellings
  • Simplified Building Energy Model (SBEM)*, which is used to assess non-domestic buildings.

These assessment models help to deliver government policy initiatives including Building Regulation compliance checks and the production of EPCs, as well as supporting the Green Deal and Energy Companies Obligation (ECO) schemes.

The models require performance data for products (e.g. boilers, heat pumps etc.) which can be generic or specific where validated individual branded product performance data is made available. Such specific data is available on this website in the Product Characteristics Database (PCDB).

For new technologies the performance needs to be assessed and their data is initially held in the Appendix Q database, which can also be accessed from this website.

An FAQ document which gives further guidance on the PCDB and Appendix Q and helps users to navigate this site is available here.

* Whilst this website contains no specific data supporting SBEM assessments, SBEM assessors may utilise data held within the PCDB for assessments as necessary.