Energy Certification of Existing Residential Buildings: Adaptations to the Energy Transition

In Portugal, the energy certification of existing buildings is mandatory since 2009 in the sales or lease contract. This obligation, imposed by the first legislation of the SCE (Energy Certification System) was based on the Energy Performance of Buildings Directive from 2002. Since then, the SCE legislation has been undergoing constant changes. The last change concerns Decree-Law No. 101-D / 2020, with practical application from July 1, 2021. More than a decade later and considering that the validity period of the energy certificate for residential buildings is ten years, the objective of this work is to present a reflection on the evolution of concepts and methodologies for calculating energy performance. The procedures for issuing the energy certificate, the content, and the graphic image, will also be analyzed. For this purpose, a single-family building, built in the 1990s and certified in November 2010, is used as an example.

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