Legally required energy performance certificates for public buildings, based on actual metered energy use.
A Display Energy Certificate (DEC) shows the actual energy usage of a public building, rated on an A–G scale, and must be prominently displayed. We carry out the assessment, produce the certificate and advisory report, and keep you compliant with renewal deadlines.
Governing regulation: Energy Performance of Buildings Regulations 2012
Standard / guidance: CIBSE TM47: Operational Ratings and Display Energy Certificates methodology
| Application | Frequency |
|---|---|
| Buildings over 1,000m² (public authority occupied) | Annually |
| Buildings 250m²–1,000m² | Every 10 years |
| Advisory report | Every 7 years |
| On significant change of use or floor area | Reassessment required |
Frequencies above are general guidance based on published standards and typical risk levels — your risk assessment or landlord obligations may require a different interval.
Public buildings are legally required to display a valid DEC in a prominent, visible location. Beyond compliance, the rating gives you a clear, evidence-based picture of your building's real energy performance and where savings can be made.
Gathering 12 months of actual metered energy consumption data for the building.
Calculating your A–G rating using the CIBSE TM47 methodology.
Producing and lodging your Display Energy Certificate on the national register.
A practical report identifying cost-effective energy-saving opportunities.
Public authority buildings over 250m² that are frequently visited by the public, such as schools, council offices and libraries.
A DEC is based on actual metered energy use and applies to public buildings; an EPC is based on a theoretical assessment and applies when a building is built, sold or let.