Display Energy Certificate (DEC)

Display Energy Certificate (DEC) and the associated Advisory Report are a legal requirement in England, Wales and Ireland. A DEC shows the energy performance of a building based on the Operational Rating on a graphical scale: from A, which is very efficient, through to G, which is the least efficient.

The Advisory Report contains recommendations that if implemented will help to improve its energy efficiency, reduce carbon emissions and in turn reduce energy costs.

All public buildings, with a total useful floor area greater than 250m2 that are occupied in whole or part by public authorities and frequently visited by the public, are obligated to have a valid Display Energy Certificates and Advisory Report. The certificate must be displayed in a prominent place that is clearly visible to the public.

The certificate and Advisory Report can only be issued, after a site visit and survey, by a fully qualified DEC Assessor. RW Air Energy Assessors are fully qualified and offer nationwide coverage.

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How often do I need a DEC?

The renewal period depends on the size of the building:

  • 250m2 to 1,000m2 - The DEC and Advisory Report should be renewed every 10 years
  • Greater than 1,000m2 - The DEC should be renewed annually and the Advisory Report every 7 years