What is a Display Energy Certificate?

A Display Energy Certificate (DEC) shows the actual energy usage of a building, the Operational Rating, and it helps the public to see the energy efficiency of the building. This is based on the energy consumption as recorded by gas, electricity and other meters.

A valid DEC should be clearly displayed at all times and clearly visible to the public.

A first year DEC is accompanied by an Advisory Report that lists cost effective measures to improve the energy rating of the building. 

When is a Display Energy Certificate Required?

A DEC is required for all public building with a total useful floor area over 250 square meters, that is occupied by a public authority and institution which is visted by members of the public.

Buildings over 1000 square meters

The Display Energy Certificate is valid for one year. The accompanying Advisory Report is valid for seven years. 

Buildings over 250 square meters (less than 1000 sqms)

The Display Energy Certificate is valid for ten years. The accompanying Advisory Report is also valid for ten years.

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