Energy Performance (EP) standardisation and regulation is by a growing number of countriesconsidered as an attractive approach for achieving a more energy efficient built environment.Several countries have already enacted such EP based regulation (the Netherlands, France,Germany, ASHRAE approach in North America), or are preparing one (Greece, theFlemish Region).The European Council and Parliament are drafting a directive on the Energy Performance ofbuildings, imposing the institution of such regulation in every member state.This paper will give a general introduction to the issue of energy performance standardisationand regulation :. A brief review of major developments during the last 3 decades;. The general principle of energy performance standardisation and regulation and anindication of the various challenges;. The need for European collaboration : a brief introduction to the SAVE project ENPER-TEBUC;. A brief introduction to the European Directive on Energy Performance;.Some reflections on the role of CEN and EOTA in relation to the issue of energyperformance standardisation and regulation.