The Inconsistency of Energy Performance Certificates (EPCs)

Energy performance certificates (EPCs) are meant to provide a rating of a home's energy efficiency and estimated running costs for potential buyers or renters. However, there are several problems with EPCs, particularly in terms of accuracy and consistency. These issues arise from various reasons, including different interpretations and measurements by assessors, reliance on assumptions, and outdated formulas. As a result, EPC ratings often do not align with the actual energy use of buildings. The lack of oversight and standardization further contributes to this disparity. Efforts are being made to update the SAP assessment system, which informs EPC ratings, but changes have been slow. It is advised for individuals interested in purchasing or renting properties to be cautious when relying solely on EPC ratings and to consider obtaining additional information, such as the SAP assessment behind the EPC, to make a more informed decision.