EU wide base regulation: https://en.wikipedia.org/wiki/Directive_on_the_energy_performance_of_buildings https://en.wikipedia.org/wiki/Directive_on_the_energy_pe

EU wide base regulation: https://en.wikipedia.org/wiki/Directive_on_the_energy_performance_of_buildings https://en.wikipedia.org/wiki/Directive_on_the_energy_perfor... In the UK: https://en.wikipedia.org/wiki/Energy_Performance_Certificate https://en.wikipedia.org/wiki/Energy_Performance_Certificate In Belgium: https://nl.wikipedia.org/wiki/Energieprestatiecertificaat https://nl.wikipedia.org/wiki/Energieprestatiecertificaat (nl language only, sorry) In Ireland: https://en.wikipedia.org/wiki/Building_energy_rating https://en.wikipedia.org/wiki/Building_energy_rating