Overview of existing surveys on energy performance related quality and compliance
Although experience has shown that Nearly Zero Energy Buildings can be realised in practice, many challenges lie ahead of driving the market in this direction. A specific challenge concerns the actual compliance of buildings with the applicable regulations, while another one lies in upgrading the quality of the works to meet NZEB standards.
Several studies and expert statements highlight critical issues on the input data used in Energy Performance Certificates (EPC), while compliance frameworks are typically limited to verifications at building permit stage (not with “as-built” data), therefore allowing for a big range of errors, due to design modifications, poor workmanship etc.
This report is a preliminary collection of information on the status of the quality of EPC input data, the quality of the works and the effectiveness of compliance frameworks in 9 focus countries (Austria, Belgium, Cyprus, Estonia, France, Greece, Romania, Spain, and Sweden) on 4 technology areas (transmission characteristics, ventilation and airtightness, sustainable summer comfort technologies, and renewables in multi-energy systems).
It identifies common problems in relation to EPC input data, e.g. absence of clear procedures, difficulty to access the EPC input data, mistakes, fraud or lack of competence of persons providing the input data, and gives examples of observed performances and interesting framework schemes.
The report summarises 31 studies addressing specific concerns on performance data from the field, the compliance of the input data, the quality of the works, or the compliance frameworks. Although the situation varies across countries and technologies, this preliminary information confirms the need to further work on schemes to improve the confidence in the compliance of input values and in the quality of the works and describes approaches developed or under development to (or potentially interesting to) improve the situation.