EPC Register Explained: How to Read Commercial Certificates

EPCs are required under the Energy Performance of Buildings (England and Wales) Regulations 2012 (SI 2012/3118), which transposed the EU Energy Performance of Buildings Directive (2010/31/EU) into domestic law. Failing to provide an EPC when required is a breach of SI 2012/3118 and can result in a penalty notice from local authority trading standards.

What is an EPC and who needs one?

An Energy Performance Certificate (EPC) is a legal document that rates the energy efficiency of a building on a scale from A (most efficient) to G (least efficient). EPCs are required under the Energy Performance of Buildings (England and Wales) Regulations 2012 (SI 2012/3118), which transposed the EU Energy Performance of Buildings Directive (2010/31/EU) into domestic law.

A valid EPC must be in place whenever a commercial building is constructed, sold, or let. This applies to offices, retail units, industrial premises, and most other non-domestic buildings in England and Wales. Each certificate is valid for 10 years from the date of issue. Failing to provide an EPC when required is a breach of SI 2012/3118 and can result in a penalty notice from local authority trading standards.

How EPC ratings work

EPC ratings run from Band A (most energy efficient) to Band G (least energy efficient). The rating is determined by the building's predicted CO2 emissions and energy consumption per square metre per year. It is an asset rating, meaning it assesses the building fabric, fixed services, and heating systems, not how the occupants actually use the building.

For commercial (non-domestic) properties, the rating is calculated using the Simplified Building Energy Model (SBEM), a government-approved methodology maintained by BRE Group. SBEM models the building's geometry, construction materials, glazing, HVAC systems, lighting, and hot water provision to produce a standardised energy and emissions estimate. For domestic properties, the equivalent methodology is the Standard Assessment Procedure (SAP). The two are not interchangeable.

The numerical score behind the band letter represents the building's CO2 emissions relative to a notional reference building of the same size and type. A lower number means lower emissions and a better band rating.

Understanding the certificate

A commercial EPC contains several key pieces of information. The current energy rating shows the building's assessed band at the time of the survey. The potential energy rating shows the band the building could achieve if all recommended improvements were carried out. The gap between current and potential rating is often the most useful piece of information for landlords planning retrofit works.

The certificate also includes a recommendations report listing specific improvements, such as upgrading lighting, improving insulation, or replacing heating systems, along with estimated cost ranges and payback periods. Each recommendation is categorised by its potential impact on the rating.

The register record holds additional data fields: the property address, current rating and band, date of assessment, assessor name and accreditation number, certificate reference number, and the UPRN (Unique Property Reference Number) where available.

The MHCLG register

All valid EPCs are recorded on the official register maintained by the Ministry of Housing, Communities and Local Government (MHCLG). The register is publicly accessible through the Open Data Communities API, which allows programmatic access to EPC data by postcode, address, certificate number, or UPRN.

The public-facing search interface is available at epc.opendatacommunities.org. The underlying API returns structured data including the rating, band, floor area, property type, transaction type, and assessment date. This open data approach means that third-party tools, including CrowAgent, can look up any property's EPC status by postcode and cross-reference it against regulatory requirements such as MEES.

The register covers both domestic and non-domestic certificates for England and Wales. Scotland maintains a separate register through Energy Saving Trust, and Northern Ireland through its own Department for the Economy system.

What Band C means for commercial stock

Under the current Minimum Energy Efficiency Standards (MEES), set out in SI 2015/962, the minimum EPC requirement for commercially let properties is Band E. Properties rated F or G cannot be legally let.

The UK government has proposed raising this minimum to Band C by 1 April 2028. This is a proposed regulatory target, it is not yet enacted law as of April 2026. The final statutory instrument has not been laid before Parliament, and the proposal remains subject to legislative confirmation. However, the direction of travel is consistent with the government's net zero commitments and the Clean Growth Strategy.

If enacted, the impact on commercial stock would be substantial. Properties currently rated D, E, F, or G would all fall below the new minimum. Centre for Cities analysis (2024) records 130,452 commercial units currently below Band E, representing 12% of total stock, while approximately 70% of commercial floor space across England and Wales is currently rated C or below. The UK Government estimates the scope of MEES Regulations will expand to cover up to 1,000,000 buildings as Band C 2028 lands.

How to look up a property

There are two straightforward ways to check a commercial property's EPC status. The first is the official register at epc.opendatacommunities.org, where you can search by postcode or address to view the current certificate, rating, and recommendations report.

The second is CrowAgent Core, which provides instant postcode lookup against the MHCLG register and automatically runs a MEES gap analysis. CrowAgent calculates the gap between the current rating and Band C, models penalty exposure under SI 2015/962, and generates retrofit scenarios, all from a single postcode entry. This saves the manual step of looking up each property individually and interpreting the results against the regulatory requirements.

Limitations of EPCs

EPCs are asset ratings, not operational ratings. They assess the building fabric, fixed building services, and heating/cooling systems based on standardised assumptions about occupancy and use. They do not reflect how the building is actually used in practice.

This means that occupancy patterns, tenant equipment, plug loads, server rooms, extended operating hours, and occupant behaviour are not captured in the EPC rating. A building with an excellent EPC rating can still have high operational energy consumption if it is heavily used or poorly managed. Conversely, a building with a poor EPC rating may consume less energy in practice if it is lightly occupied.

Display Energy Certificates (DECs), required for public buildings over 250m² under SI 2012/3118, provide an operational rating based on actual metered energy consumption. DECs complement EPCs but serve a different regulatory purpose and are not interchangeable with them.