Display Energy Certificate
A Display Energy Certificate (DEC) is a legal requirement for public buildings in the UK that are larger than 250m² and frequently visited by the public. It provides an energy efficiency rating from A (most efficient) to G (least efficient) based on actual energy usage over the past 12 months.
DECs must be prominently displayed in a public area and are accompanied by an Advisory Report, which outlines recommendations for improving energy efficiency.

Who Needs a DEC?
You are required to obtain a DEC if:
✔ Your building is larger than 250m²
✔ It is occupied by a public authority (e.g., schools, hospitals, council buildings)
✔ It is regularly accessed by the public
Failure to display a valid DEC can result in a fine of £500, and not having an Advisory Report can lead to an additional £1,000 fine.
How Long is a DEC Valid For?
- For buildings over 1,000m² – The DEC is valid for 1 year, and the Advisory Report lasts 7 years.
- For buildings between 250m² and 1,000m² – The DEC and Advisory Report are both valid for 10 years.
How We Provide DECs
At LJ Energy Surveys Ltd, we offer a fast and efficient DEC service:
Energy Data Analysis – We assess your energy usage over the past 12 months.
On-Site Inspection – Our qualified assessor reviews heating, cooling, lighting, and other key factors.
DEC Generation – We produce and register your DEC, ensuring full compliance.
Advisory Report Creation – A tailored report with energy-saving recommendations.