Public buildings in England and Wales (but not Scotland) require a Display Energy Certificate showing actual energy use, and not just the theoretical energy rating. Display Energy Certificates (DECs) show the actual energy usage of a building, the Operational Rating, and help the public see the energy efficiency of a building. This is based on the energy consumption of the building as recorded by gas, electricity and other meters. The DEC should be clearly displayed at all times and clearly visible to the public. A DEC is always accompanied by an Advisory Report that lists cost effective measures to improve the energy rating of the building.
A DEC and advisory report are required for buildings with a total useful floor area over 250m² that are occupied in whole or part by public authorities and frequently visited by the public. For the purposes of the regulations, a building is defined 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 a building which has been designed or altered to be used separately’.
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