What is the BER Methodology?

The national methodology for the BER of new dwellings was published in June 2006 and is called the Dwellings Energy Assessment Procedure (DEAP), which can be viewed and downloaded as a calculation workbook and manual here. DEAP is a hybrid of the draft European Standard (prEN13790) and the UK Standard Assessment Procedure (SAP). The DEAP method will be used to demonstrate compliance with certain provisions of Part L of the Building Regulations and also to produce a BER. The national methodology for non-residential buildings has not yet been decided. The European Standards body (CEN) is currently developing relevant standards.