Display Energy Certificates are now required for buildings with a total useful floor area over 1,000 square metres that are occupied by a public authority or institution providing a public service to a large number of persons and therefore visited by those persons. The certificates are valid for twelve months and must be displayed in a prominent location. The accompanying advisory report is valid for seven years and details short, medium and long-term recommendations to enhance the energy performance of the building.

NB - DECs must be renewed every 12 months.