Indicators and Data in Spain Regarding an Overview of Worst Performing Segments of the National Building Stock, Rented Properties and Energy Poverty

Indicators are necessary to assess the effectiveness of building renovation policies and to know whether the European Union Member States’ long-term renovation strategies deliver the necessary progress towards the transformation of the building stock into a decarbonized one. Worst performing segments, rental properties, and energy poverty have been identified as key issues to be addressed in the decarbonization of the building sector in Europe. In this chapter, we propose indicators to measure the evolution in Spain of the worst performing segments of the building stock regarding energy, the energy performance of rented properties, and energy poverty following the European Commission recommendations and directives. We also studied the sources of information available in Spain for the development of these indicators and developed them when there were data. This study allowed us to conclude that in this country, there are good sources of data to develop energy poverty indicators, which could be improved by systematically collecting information on the percentage of population living in inadequate housing thermal conditions in summer. It is necessary to improve and unify the information from the energy performance certificates of buildings published by the different regions of Spain in order to better develop indicators relating to the worst segments of the building stock. There is a lack of data to develop indicators on the energy efficiency of rented properties.