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• The interviews indicate that the public has a limited understanding of Energy Performance Certificates (EPCs) and does not fully recognize their economic and energy-saving benefits. • Stakeholders emphasize the need to ensure the quality of EPC data, improve user accessibility, and include indicators that allow for a more accurate assessment. • Vulnerable populations may face exclusion due to the high costs associated with building renovations required to improve EPC ratings, potentially exacerbating energy poverty. • Aligning technical improvements in EPCs with public understanding can support more effective adoption and have a greater impact on reducing energy consumption and emissions. Amidst the pressing concern about climate change, the construction sector has been identified as one of the main energy consumers in Europe, which also positions it as one of the sectors with the greatest potential for efficiency improvements. In response to this, the European Union established the Energy Performance Certificate (EPC) system, with the aim of boosting transparency and encouraging sustainable renovations. However, the results have not been as expected. Some of the causes of this are poor data quality, limited public awareness and inadequate legislation, which together undermine trust in the certification process. In addition, concerns about the possible exclusion of low-income households have sparked debates about the financial burdens and possible rent increases following energy efficiency improvements. This article presents insights from a qualitative study of various stakeholders, including public agencies, technical experts and real estate professionals, examining prevailing perceptions of EPC design, implementation and utility. Key findings reveal that mandatory policies drive adoption, but administrative complexities and inconsistent metrics erode public trust. Furthermore, the gap between specialist and non-specialist audiences prevents the certificate from playing a role in motivating behaviour change. The new version of the European Commission's Energy Performance of Buildings Directive (EPBD) introduces standardised templates and databases. Added to this, stakeholder feedback highlights the need for public education, accurate energy data and tailored financial mechanisms. This study concludes that to refine EPC policies, integrated and holistic frameworks are needed that address socio-economic risks, foster equity and accelerate Europe's transition to low-carbon housing.
Aitziber et al. (Sat,) studied this question.