Display Energy Certs

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What is a Display Energy Certificate(DEC)?” open=”yes”]

From the 9th January 2013 publicly and privately owned buildings over 500m2, frequently visited by the public, are required to exhibit a DEC, in a prominent place, clearly visible to the public. The DEC is intended to encourage public authorities to adopt environmentally responsible and efficient use of energy in buildings.

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What is the format of the DEC?

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The DEC is based on the measured energy use, where the actual energy consumed in the building is compared to a benchmark for similar buildings, and shown on the certificate A1 – G scale in terms of primary energy. There is also a CO2 indicator which shows the CO2 emissions associated with the building’s energy consumption. Benchmark or typical buildings have a E1 rating.

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How is a DEC calculated?

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The DEC rating is calculated on the basis of the ACTUAL energy consumption, during occupation, over a ONE YEAR period. The DEC reflects the use of the building and the practices of management and maintenance. This is calculated from meter readings / bills or an alternative reliable source. From this, an operational rating is derived. The energy used by the building over the year is required. This may include gas fuels, oil fuels, solid fuels, district heating and cooling and electricity. Energy consumption is ideally obtained directly from onsite incoming energy meters, or from energy supply company bills. If this information is not available from those maintaining the building or the landlord, an estimate should be provided from the energy supplier. The Assessor can only use estimates data directly from the energy supplier and no other source

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When is the exhibition of a Display Energy Certificate (DEC), legally required?

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From 9th January 2013 a DEC is required for all buildings over 500m² frequently visited by the public.
Does the DEC relate to a whole building or to the part of a building occupied by a Public Body?
The DEC requirement relates to the whole building or part of the building over 500m2 frequently visited by the public.

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What happens if there is not a sufficient amount of data?

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If there isnt sufficient billing data available, the rating will default to G.The data has to be metered or an estimated measurements of energy consumption to cover more than 95% of energy used by the building.

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Who can carry out a DEC Assessment?

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DECs are completed by DEC Assessors registered with SEAI. Candidates seeking to register as a DEC Assessor must be registered with SEAI as a Non-Domestic BER Assessor and successfully complete a DEC Assessor workshop delivered by SEAI

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How is the DEC generated?

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The DEC procedure involves the collection of all relevant data required to produce the certificate, by the registered Assessor. The data is put into a workbook and forwarded on to SEAI for processing. The DEC is generated by SEAI. Once the relevant party receives the DEC, it must be displayed in a prominent place. The certificate displays the grade awarded, an energy performance indicator, a CO2 performance indicator, histograms of trends in energy, primary electrical and heating energy per unit, a building identifier, basic building technical information, period of validity of the DEC, a unique DEC number and DEC Assessor number.

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Where should the public body display the DEC?

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In addition to the hard copy on display, public bodies may wish to provide a valid cert via a website or other publicly accessible media, show the full technical data that gives underlying details on the building and its energy performance and display supplementary information to explain the contents of the certificate, including any reasons explaining poorer / better performance to the previous years result.

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How does a DEC differ from the BER (Building Energy Rating), that is required at construction, sale or rent of a building?

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Building Energy Rating (BER) rating for domestic and non-domestic buildings is a rating certificate based on calculated energy use.
Display Energy Certificate (DEC) rating is a rating certificate based on measured energy use.

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