Display Energy Certificates (DECs)

What is a DEC?

A Display Energy Certificate or DEC is a certificate that shows the energy use in a building that is occupied by public authorities or institutions providing a public service. On 1st October 2008, it became a legal requirement for all buildings with a total useful floor area of over 500m2 that are occupied the by public authorities or institutions providing a public service to prominently display a DEC. DECs have to be renewed annually in order to keep the public informed how energy efficient the building is.

In January 2013 there was an update to the regulations regarding DECs – they are still required, but now DECs on buildings with a floor area of between 500m2 – 1000m2 have a 10 year validity.

DECs use a rating scale from A to G, where A is very efficient and G is very inefficient.

For further information, help, advice or a quotation, please contact HRS on 0800 030 4391 / email: info@hrsservices.co.uk or click to go to the KNOWLEDGE Hub.

What does DEC stand for?

DEC stands for Display Energy Certificate.

What is a DEC?

A Display Energy Certificate or DEC is a certificate that shows the energy use in a building that is occupied by public authorities or institutions providing a public service. On 1st October 2008, it became a legal requirement for all buildings with a total useful floor area of over 500m2 that are occupied the by public authorities or institutions providing a public service to prominently display a DEC.

DECs have to be renewed annually in order to keep the public informed how energy efficient the building is.

In January 2013 there was an update to the regulations regarding DECs – they are still required, but now DECs on buildings with a floor area of between 500m2 – 1000m2 have a 10 year validity.

DECs use a rating scale from A to G, where A is very efficient and G is very inefficient.

Do all buildings need to have a DEC?


If the building is greater than 250m2 and is occupied or part-occupied by a public authority or institution, or if the building will provide a public service that is visited by the public, then your building may need to have a DEC.

Who responsibility is it to obtain a DEC?

It is the responsibility of the public authority or relevant institution providing a public service to display a DEC in each of their buildings affected by the legislation.

How do I get a DEC?

Please contact HRS on 0800 030 4391 or e-mail info@hrsservices.co.uk and one of HRS’s highly experienced Energy Assessors would be more than happy to discuss your requirements.

What information is assessed for a DEC?

For a Display Energy Certificate, energy consumption information is assessed. The gross internal area of the building, as well as its type of operation, are both taken into account. Please note that actual meter readings or consignment notes for all fossil fuels used in your buildings are required under this legislation.

What information does a Display Energy Certificate show?

A DEC is a chart showing a building’s operational rating, carbon dioxide emissions and previous operational ratings for the last three years. The operational rating measures the energy efficiency of a building on a scale of ‘A’ to ‘G’, where ‘A’ is the most efficient. HRS will also provide you with an advisory report. This is provided to you at the same time that you get your DEC. This report will contain recommendations on ways in which the energy efficiency of the building can be improved.

Do I need to renew my DEC?

Yes. Where the building has a total useful floor area of more than 1,000m², a Display Energy Certificate is only valid for 12 months. The accompanying advisory report is valid for seven years. Display Energy Certificates and advisory reports for smaller buildings are valid for 10 years.

How much does a Display Energy Certificate cost?

The cost will vary depending on the size and type of the building which requires a DEC.

Please contact HRS on 0800 030 4391 or e-mail info@hrsservices.co.uk and one of HRS’s highly experienced Energy Assessors would be more than happy to discuss your requirements.

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