Display Energy Certificates (DECs)

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Display Energy Certificates (DECs) and advisory reports are required to be obtained by buildings that are occupied by a public authority, are larger than 250m² and frequently visited by the public. 

 Where the building has a total useful floor area of between 250m² and 1000m², the DEC and advisory report are valid for 10 years.

 Where the building has a total useful floor area of more than 1,000m², the DEC is valid for 12 months. The accompanying advisory report is valid for seven years.