Display Energy Certificates (DECs)
A Display Energy Certificate shows the actual energy usage of a building, the Operational Rating, and helps 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.
DECs and advisory reports are required for buildings with a total useful floor area over 1,000m2 that are occupied in whole or part by public authorities and by institutions providing public services to a large number of persons and therefore frequently visited by those persons.
DECs are valid for one year. The accompanying Advisory Report is valid for seven years. The requirement for Display Energy Certificates came into effect on 1 October 2008.