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2. European Comission. EU Building Stock Observatory. https://energy.ec.europa.eu/topics/energy-efficiency/energy-efficient-buildings/eu-building-stock-observatory_en (2023).
3. Buildings Performance Institute Europe (BPIE). 97% of buildings in the EU need to be upgraded - factsheet http://bpie.eu/wp-content/uploads/2017/10/State-of-the-building-stock-briefing_26Ott_v1.pdf (Brussels, Belgium, 2017).
4. Pezzutto, S. et al. Hotmaps Project, D2.3 WP2 Report – Open Data Set for the EU28, 2018 https://gitlab.com/hotmaps/building-stockgitlab.com/hotmaps/building-stock (EURAC, e-think, TUW, Fraunhofer ISI, 2018).
5. Seefeldt, F., Rau, D. & Hoch, M. Fachkräftebedarf für die Energiewende in Gebäuden (en: Skilled workers needed for the energy transition in buildings) https://www.prognos.com/de/projekt/fachkraeftebedarf-fuer-die-energiewende-gebaeuden (prognos AG, Berlin, Germany, 2018).