Planning, building and the environment

Display Energy Certificates (DECs)

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 in a prominent place 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.

Display Energy Certificates are only required for buildings with a total useful floor area greater than 1000m², that are occupied by a public authority or an institution providing a public service to a large number of people, and are frequently visited by members of the public. Display Energy Certificates are valid for one year. The accompanying Advisory Report is valid for 7 years.

In the longer term, the Government has announced our intention to consult on whether this requirement should be extended to include private sector buildings occupied by commercial organisations, where large numbers of members of the public regularly visit the building. Such an extension would be subject to separate legislation.

The requirement for Display Energy Certificates comes into effect from 1 October 2008.