Display Energy Certificates (DEC)

DECs are required for buildings that have an entire useful floor area of more than 250m² and that are occupied by a public authority or an institution that provides a public service and are frequently visited by members of the public. These certificates show the actual energy usage of the building and allow the public to see how efficient the property is and are based on the energy consumption of the building recorded by gas, electricity and other meters.

The DEC is valid for one year, with the associated Advisory Report valid for seven years. The DEC should be displayed in a prominent location and always clearly visible to the public.

To obtain a DEC you will need to employ the services of a suitably accredited Energy Assessor. The Energy Assessor will record the Display Energy Certificate on the Northern Ireland register which you can access at https://www.gov.uk/find-energy-certificate.