Minimum Performance Standards for Your Commercial EPC Rating

Understanding the commercial EPC rating requirements for non-domestic properties is one of the most critical — and most frequently misunderstood — obligations facing UK property owners and landlords today. With government legislation tightening and enforcement becoming more active, failing to comply carries consequences that can be genuinely costly. This guide sets out exactly what minimum energy performance standards apply to commercial properties, what has changed, and what property owners in Teesside and across the North East need to know.

What Is a Commercial EPC Rating and Why Does It Matter?

A commercial EPC rating is an official assessment of how energy efficient a non-domestic building is, expressed on a scale from A (most efficient) to G (least efficient). It is a legal document, not an optional report. Any commercial property that is sold, let, or constructed must have a valid certificate in place before it is marketed.

The rating is calculated using standard assessment methodology, taking into account factors such as the building’s construction, heating systems, lighting, and ventilation. Unlike a domestic EPC, a non-domestic assessment uses software tools such as iSBEM or Dynamic Simulation Modelling, depending on the complexity of the building.

A poor commercial EPC rating is not simply a cosmetic concern. It can block a landlord from legally letting the property, trigger enforcement action by the local authority, and reduce the market value of the asset considerably.

The Minimum Energy Efficiency Standards for Commercial Properties

The Minimum Energy Efficiency Standards (MEES) legislation, introduced under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015, set a baseline that non-domestic landlords must meet before letting a property. Since 1 April 2023, it has been unlawful to continue to let a commercial property with a commercial EPC rating below E — even if the tenancy was already in place before that date.

This was a significant expansion of the rules. Previously, the requirement only applied to the grant of a new lease or a lease renewal. The extension to existing tenancies meant that thousands of landlords across England and Wales found themselves in breach overnight if their property fell below the required standard.

For properties in Middlesbrough, Stockton-on-Tees, Hartlepool, and Darlington, this has had a very practical impact on older commercial stock — particularly older retail units, industrial premises, and converted commercial spaces where energy efficiency improvements have not kept pace with legislative change.

What Does a Minimum Commercial EPC Rating of E Actually Mean?

A commercial EPC rating of E means the property scores between 76 and 100 on the standard assessment scale used for non-domestic buildings. Any property rated F or G is currently below the legal minimum and cannot lawfully be let to a tenant unless a valid exemption has been registered.

It is worth emphasising that the current minimum commercial EPC rating of E is not the end point. The UK government has proposed raising this minimum to B by 2030 for new tenancies and by 2035 for existing ones — though these proposals are subject to ongoing consultation and have not yet been enshrined in law at the time of publication.

Landlords would be wise to treat the current threshold as a floor, not a ceiling. Properties that achieve exactly an E today may require significant investment within a few years if the proposed trajectory is confirmed.

Critical Exemptions to Commercial EPC Rating Requirements

Not every commercial property must meet the minimum commercial EPC rating threshold. The legislation provides for a number of specific exemptions, all of which must be formally registered on the PRS Exemptions Register to be valid. Assuming an exemption applies without registering it offers no legal protection whatsoever.

The main exemptions include:

• All improvements made exemption: The landlord has made all cost-effective, relevant energy efficiency improvements available and the property still falls below the minimum commercial EPC rating. This exemption lasts five years.
• Third-party consent exemption: The landlord has been unable to obtain necessary consent from a tenant, lender, or superior landlord to carry out the required improvements.
• Devaluation exemption: An independent surveyor has confirmed in writing that making the improvements would reduce the market value of the property by more than 5%.
• New landlord exemption: A landlord who has recently become responsible for the property (through inheritance, for example) is granted a six-month temporary exemption.
• Temporary exemption: Applies for six months when a property is newly let.

It is essential that landlords in the North East seek proper professional advice before relying on any of these routes. Registering an invalid exemption is treated as seriously as failing to comply at all.

Penalties for Non-Compliance With Commercial EPC Rating Rules

The enforcement of commercial EPC rating rules falls to local weights and measures authorities — typically Trading Standards departments. Penalties are calculated as a proportion of the rateable value of the property and can be substantial.

For a breach lasting less than three months, the fine is the greater of £5,000 or 10% of the property’s rateable value, up to a maximum of £50,000. For a breach lasting three months or more, the greater of £10,000 or 20% of the rateable value applies, up to a maximum of £150,000. Publication of the breach on the national register of non-compliant landlords can accompany any financial penalty.

For commercial property owners across Teesside — particularly those with high-value retail or office premises — the financial exposure from a poor commercial EPC rating left unaddressed can be severe. The reputational damage of appearing on a published non-compliance list may be equally damaging in a regional market where business relationships matter.

How a Commercial EPC Rating Is Assessed in Practice

Obtaining a commercial EPC rating requires a qualified Non-Domestic Energy Assessor (NDEA) accredited to an approved scheme. The assessor will carry out a site visit to collect data on the building fabric, fixed building services (heating, cooling, hot water, lighting, and ventilation), and any renewable energy systems present.

The data is then entered into approved software, which calculates the asset rating — a theoretical score based on how efficient the building would be under standardised conditions. This is distinct from an operational rating, which reflects actual energy use. The commercial EPC rating is always the asset rating.

Common factors that negatively affect a commercial EPC rating include single-glazed windows, poorly insulated roofs, ageing gas boilers, inefficient lighting systems, and the absence of controls such as thermostats or time switches. Assessors find that many older commercial premises in towns like Redcar, Durham, and Stockton carry ratings of D or E simply because no improvements have been made since original construction.

For further guidance on how assessments work, the Chartered Institution of Building Services Engineers (CIBSE) provides detailed technical resources for building professionals and property owners.

Improving a Commercial EPC Rating Before Letting

Where a property currently falls below the required commercial EPC rating of E, landlords should commission an assessment as a first step to understanding which improvements will deliver the greatest uplift. Not all measures are equally cost-effective, and the MEES framework only requires landlords to install measures that can be achieved at no net cost — or below a defined cost cap for non-domestic properties.

High-impact improvements typically include upgrading to LED lighting throughout, improving roof insulation, replacing older heating plant with modern condensing boilers or heat pumps, and installing building management controls. The Energy Saving Trust publishes practical guidance on energy-efficiency improvements that applies across building types.

Landlords should also consider whether their existing EPC is still current. A commercial EPC rating is valid for ten years, but if significant work has been carried out since the certificate was issued, a new assessment may reflect a considerably better rating than the one currently on record.

What Commercial Property Owners in the North East Should Do Now

With the proposed trajectory of MEES moving toward a minimum commercial EPC rating of B by the mid-2030s, the time to act is now — not when a lease renewal is imminent or enforcement action has begun. A proactive approach allows landlords to plan improvements in phases, spread costs over time, and avoid the disruption of emergency works carried out under pressure.

EPCIQ provides accredited energy performance assessments for commercial and domestic properties across Middlesbrough, Stockton, Hartlepool, Darlington, Redcar, and the wider North East. Certificates are lodged on the same day as the assessment, ensuring landlords and property owners have the documentation they need without unnecessary delay.

Those seeking a commercial EPC rating for a property anywhere in Teesside can contact EPCIQ directly to arrange an assessment. Further answers to common questions about commercial and domestic certificates are available on the EPCIQ FAQ page.

For those based in or around Middlesbrough specifically, further information on local EPC services is available at EPC in Middlesbrough. Understanding the rules now — and acting on them — is far less costly than facing enforcement action later.

The national EPC register allows anyone to check whether a valid certificate is already in place for a given address. It is always worth verifying this before completing any property transaction or entering a new tenancy.