Display Energy Certificates
The law requires buildings over 250m² that are occupied in whole or in part by public authorities and frequently visited by the public to display a Display Energy Certificate (DEC).
DECs are accompanied by an Advisory Report which contains recommendations for improving the energy performance of the building.
DECs are valid for 1 year on buildings more than 1000m2 and 10 years for buildings between 250m2 and 1000 m2. DECs must be displayed in a prominent place clearly visible to the public.
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Frequently Asked Qustions...
What is a DEC?
The certificate shows the energy performance of the building based on the energy consumption data recorded from the last 12 months. The rating is an operational rating unlike EPCs which provide an asset rating. The rating is shown on a scale from A to G with A ratings representing a building with lower CO2 emissions and G ratings signifying the highest CO2 emissions.
The rating is based on the amount of energy consumed during the previous 12 months which is benchmarked against a typical building of the same type. The operational rating of a typical building is 100. Therefore a value of 0 indicates a zero carbon building and a value of 200 indicates twice the typical CO2 emissions.
Which types of buildings are affected?
The law requires buildings over 250m2 that are occupied in whole or part by public authorities and frequently visited by the public to display a Display Energy Certificate (DEC).
Where a building is partly occupied by a public authority it is the responsibility of that public body to arrange and display a DEC. Other private organisations within the building do not need to display a DEC.
How long is a DEC valid?
For buildings with 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 7 years. Where the building has a total useful floor area of between 250m2 and 1000m2 the DEC and Advisory Report are valid for 10 years.
What is an Advisory Report?
DECs are accompanied by an Advisory Report which contains recommendations for improving the energy performance of the building. Currently it is not mandatory to comply with the recommendations made in the Advisory Report.
What are the penalties for not having a DEC?
DECs must be displayed in a prominent place clearly visible to the public. Failure to do so could result in a £500 penalty. A penalty of £1000 can be issued for those who do not possess or have in their control a valid advisory report.
Who can undertake a DEC?
A DEC needs to be undertaken by a qualified non domestic energy assessor. All qualified assessors can be found on the Non-Domestic Energy Performance Register managed by Landmark.
What does an DEC involve?
The assessor must conduct a site visit so that the building dimensions can be measured and any available information relating to the building fabric, lighting and HVAC can be assembled. The assessor will also require 12 months of energy bills. When a DEC is being renewed the following year the assessor may not need to conduct a further site visit provided that the building has not changed in any way, written confirmation of this is provided to the DEC assessor and the same DEC assessor is completing the assessment.
When the DEC has been lodged the client is sent a copy. The DEC will also be lodged and available for download on the central register: www.ndepcregister.com