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Energy Assessment
Display Energy Certificates (DEC)


What is a Display Energy Certificate and Advisory Report?

A Display Energy Certificate is an A3 size certificate (see sample - opens in new window) which must be prominently displayed in all public buildings accessed frequently and regularly by the public. The certificate gives information to the public about the energy usage of that building. The building is given an Operational rating (OR) which relates to the buildings energy usage and CO2 emissions over a period of 12 months. The Operational Rating translates to a building category from A to G, with A being the best performing and G being the worst. The Advisory Report contains recommendations to improve and reduce energy usage.

Display Energy Certificates are valid for 1 year and Advisory Reports are valid for up to 7 years. Operational ratings for the last 3 years will be displayed on the certificate where these are available.

Download the CLG guide on Display Energy Certificates here (opens in a new window).

Which buildings need Display Energy Certificates (DECs)?

All buildings with a total useful floor area over 1,000sqm which are occupied by public authorities and by institutions providing public services to a large number or persons and which are frequently visited by those persons. Examples would be government buildings, museums, swimming pools, libraries, colleges...

When are Display Energy Certificates (DECs) required?

The obligations for provision of a Display Energy Certificate came into force on 1st October 2008.

Who can produce Display Energy Certificates (DECs)?

Display Energy Certificates and Associated Reports can only be produced by Qualified, Accredited Non-Domestic Energy Assessors. Our Surveyors are fully accredited with the CIBSE accreditation scheme which gives you assurance of our professional approach and ability to meet your requirements. For more information click here (opens in a new window)