Display Energy Certificates

Display Energy Certificates were introduced by the British Government in response to the EU Energy Performance of Buildings Directive. They cover buildings occupied by public bodies. DECs are designed to promote the improvement of the energy performance of buildings. They are based upon actual energy usage of a building and increase transparency about the energy efficiency of public buildings.


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


Where the building has a total useful floor area of between 250m² and 999m², the DEC and Advisory Report are valid for 10 years.


The Advisory Report is designed to help building owners occupiers to improve the energy efficiency of their buildings so that future DECs show a better rating. ARs do not need to be displayed, but must be available.


DECs and ARs must be undertaken by an accredited energy assessor using Government approved software. The penalty for failing to display a DEC where required is £500 and the penalty for not having an Advisory Report available is £1,000.

  • All public buildings over 250m² require a DEC and AR

  • Based on actual energy bills

  • Produced by in-house accredited staff

  • Further information