DEC’s and accompanying Advisory Reports are required on all buildings with a total useful floor are in excess of 500m² that are occupied by public authorities and visited by the public.

For the purposes of the regulations, a building is described as a roofed construction having walls, for which energy is used to condition the indoor climate, and a reference to a building includes a reference to a part of the building which has been designed or altered to be used separately.

From July 2015, these regulations have been further extended and DEC’s will be required to be displayed for all such buildings that are in excess of 250m².