The presentation presents findings of various European studies dealing with the status on the ground regarding compliance with energy performance legislation, e.g.: What level of agreement in France is there between ventilation specifications in the legislation and observations on site for new residential ventilation systems? Declared transmission characteristics versus the reality for new buildings in Cyprus. Declared conformity with overheating requirement versus correct assessment results in Estonia. Impact of calculation choices on the declared energy performances for Spain. Real versus calculated energy use in Sweden. Interactive voting with the participants is used to increase the dynamics of the workshop.