Display Energy Certificate (DEC) for Public Buildings in England

​​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.

An affected organisation must display a DEC in a prominent place clearly visible to the public and have in its possession or control a valid advisory report. The advisory report contains recommendations for improving the energy performance of the building.

• 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.