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Display Energy Certificates (DEC) PDF E-mail

A Display Energy Certificate shows the energy performance of a building based on actual energy consumption as recorded annually over periods up to the last three years. DEC’s need to be updated each year.

Firstly the energy consumption data provided will be reviewed by the assessor in line with the approved method. Adjustments may be made for occupancy, intensity of use, special energy uses, weather and climate.

The carbon dioxide emissions for the certificate are based on the adjusted energy consumption and total useful floor area and building type to give a measured CO2 emission per square metre.

The assessor will then produce a DEC and an Advisory Report from this information in line with the approved method. The DEC will need to be lodged in a national register by the assessor and given a unique certificate reference number.

An example of what a DEC might look like is shown below. The Operational Rating is a numerical indicator of the actual annual carbon dioxide emissions from the building. This Rating is shown on a scale from A to G, where A is the lowest (best) and G is the highest (worst). Also shown are the Operational Ratings for the last two years; this provides information on whether the energy performance of the building is improving or not.

The Advisory Report will contain recommendations for improving the energy performance of the building. A DEC is valid for 12 months and needs to be updated annually. The accompanying Advisory Report is valid for 7 years.