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Display Energy Certificate (DEC)

Display Energy Certificate (DECs) was introduced by the British Government in response to the EU Energy Performance of Buildings Directive. DECs are designed to promote the improvement of the energy performance of public body buildings. They are based upon actual energy usage of a building and increase transparency about the energy efficiency of the 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 in order that future DECs reflect a better rating.


DECs and ARs must be undertaken by an accredited energy assessor using Government approved software, as is performed by ESOS-Energy. 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.

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

  • Based on actual energy bills

  • Produced by in-house accredited staff

  • Further information

Frequently Asked Questions

How often do I have to renew my DEC?

I already have an EPC for my building. Do I still need a DEC?

Im new in post. Is there a way I can find out if my building already has a DEC?

How can I improve my DEC rating?

My site has multiple buildings. Can a single DEC cover the whole site?

You may have questions beyond those listed above. Since our founding in 2014, we are proud to have produced over 30,000 (and counting!) Display Energy Certificates, and would be happy to share our expert advice with you. Feel free to drop us a line, either using our contact form below, or by phone on 01179 309689.

Get in touch

If you would like a quote, further information on any of our products or services, or would like to offer feedback on your experience with us, we want to hear from you! Use our contact form here, and one of our team will review and respond to your message within 24 hours. 

Alternatively, give us a call on 01179 309689

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DEC quote

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