Energy Performance Certificates (EPC) are due to evolve with improvements being made to the methodology and assessment procedure shortly, RDSAP v9.82. The RDSAP (Reduced Data Standard Assessment Procedure – the government approved standardised system for undertaking an energy survey on an existing dwelling), has always had its limitations as it is a simplified version of the full SAP methodology.
Energy Performance Certificates were implemented as part of the Home Information Pack legislation on 1st August 2007 and will also be required as of the 1st October 2008 in the rental market. EPC are now becoming more widely understood and the benefits they bring recognised. However, there has been criticism made about the accuracy of some assessments in certain scenarios due to the inherent limitations of RDSAP to include some less frequently found aspects.