Display Energy Certificates (DECs) show the actual energy usage of a building, the Operational Rating, and help the public see the energy efficiency of a building. This is based on the energy consumption of the building as recorded by gas, electricity and other meters.
The DEC should be clearly displayed at all times and clearly visible to the public. A DEC is always accompanied by an Advisory Report that lists cost effective measures to improve the energy rating of the building.
Display Energy Certificates are only required for buildings with a total useful floor area over 1,000m 2 that are occupied by a public authority and institution providing a public service to a large number of persons and therefore visited by those persons. They are valid for one year. The accompanying Advisory Report is valid for seven years.
The requirement for Display Energy Certificates came into effect on 1st October 2008.
The DEC is valid for 12 months and needs to be updated annually with no gaps between finishing and starting dates.
The accompanying Advisory report is valid for 7 years.
A DEC must contain by law the following information:
- The operating rating and the asset rating (when available) as determined by the Government approved method.
- Show the operational ratings for the building expressed in any certificates displayed by the occupier during the last two years before the nominated date
- Include a reference value such as current legal standards or benchmark
- The DEC will also show a unique reference number, the address and useful floor area of the building, the name and address of the assessor, the name of the accreditation scheme and the date of issue of the DEC.