(Display Energy Certificates)

  • Cost effective
  • Quick turnaround
  • Follow up support

Your DEC needs to be shown publicly and updated every year.

What Is The Purpose of DECs?

DECs (Display Energy Certificates) raise public awareness of the energy usage of public buildings and inform visitors about energy use. DECs are operational ratings and promote energy performance improvement in public buildings.

An Advisory Report (AR) is given to the building owner and occupiers from the DEC assessor which has suggestions to improve the energy efficiency of the building. The Advisory Report aims for future DECs to show a better energy rating, improve energy efficiency and reduce carbon emissions.

How Are DECs Measured?

A DEC assessor will provide an energy rating for the building from A to G, where A is very efficient, and G is the least efficient. The rating is based on the actual amount of metered energy used by the building over the last 12 months, within the validity period of the DEC. The rating given will show the energy performance of the building.

An accredited DEC energy assessor must complete the DECs; the Compliance team at Carbonbit is highly experienced and skilled in all energy and sustainability compliance areas. The energy assessor will use the authorised and accredited  software along with information about the gross internal floor area of the building, the operating hours and the actual meter readings for all fuels used over the past year, requiring owners and/or tenants of public buildings need to keep records of all energy used, assuming it is being used as a public building.


Contact us to discuss your requirements and how we can help you.


    Who Needs a DEC? And How Often Are They Required?

    Any public building with a total floor area of over 250m2 requires a DEC rating. Since the purpose is to inform the public of the energy efficiency of the building, a DEC is not necessary for buildings where members of the public will not be entering. All affected organisations must display a DEC in a prominent place clearly visible to the public and have in its possession or control a valid advisory report. Here are examples of authorities and institutions where DEC ratings are usually required: leisure centres, police stations, prisons, public libraries, museums & art galleries, hospitals (not private hospitals unless NHS patients are admitted), NHS trusts, schools, colleges & universities, supermarkets.

    The viability period of display energy certificates (DECs) depends on the size of the building, more specifically, the total functional floor area of the building. For properties with more than 1,000m2 of used floor, the DEC is valid for 12 months, although the Advisory Reports are valid for 7 years.. The accompanying advisory report is valid for seven years. When a building has a total functional floor area of between 250m2 and 1000m2, the DEC and the Advisory Report are valid for ten years.

    Contact Us To Find Out More About DECs

    If you are in charge of a building where a DEC is required, please get in touch, and we can discuss your requirements and how we can help you. Our DEC assessors will help you improve the energy efficiency of your building, reducing your carbon emissions and energy consumption. Talk to our team and begin your journey and reduce your sustainability risk.