Energy performance certificates have been required since 6 April 2008 when commercial buildings are built, sold or rented.
Display Energy Certificates (DECs), are required for public buildings and those occupied by public authorities which have a total useful area greater than 1000m2 and provide a public service to a large number of people and are therefore frequently visited by those people (eg a school, hospital, government or local authority building). DECs show the actual energy usage of a building and, since 1 October 2008, need to be displayed.
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