Commercial Minimum Energy Efficiency Standards Regulations Explained

In June 2026, the Government finally confirmed where commercial property energy standards are heading. From 2031, privately rented non-domestic buildings over 1,000 square metres in England and Wales must hold an EPC rating of B or above.

Previously, EPC C was the 2027 target. Now, landlords need to achieve a B, which is three rating bands above the current legal minimum of E.

Buildings that cannot demonstrate a pathway to EPC B will face letting restrictions, reduced valuations, and potential penalties of up to £150,000. While the government has provided some breathing room by removing 2027 targets, businesses still need to move fast to meet EPC B.

This guide explains the current Minimum Energy Efficiency Standards (MEES) rules. It explains what is changing and why, and explains how estate professionals can plan ahead to avoid surprises.

What Are the Minimum Energy Efficiency Standards?

The Minimum Energy Efficiency Standards (MEES) are a set of legally binding requirements that determine whether a privately rented property in England and Wales can be let. Introduced under the Energy Efficiency Regulations in 2015, they apply to both domestic and non-domestic properties, though the rules and timelines for each differ significantly.

A property’s EPC rating (its Energy Performance Certificate score, running from A (most efficient) to G (least efficient)) determines whether it complies. Where it falls below the minimum, letting the property becomes unlawful, unless a valid exemption has been registered.

MEES matters to estates teams because it affects the legality of leasing commercial space. It matters to investors and finance teams because it shapes valuations. And it matters to sustainability leads because it represents mandatory minimum progress towards decarbonisation.

The Current Legal Position for Commercial Property

For non-domestic properties in England and Wales, the MEES regulations have been tightening in phases since 2018. The current picture:

• April 2018: It became unlawful to grant new leases for commercial properties with an EPC rating below E.
• April 2023: The prohibition extended to all existing commercial leases. A lease that was legal when granted became unlawful if the property held an F or G rating and no valid exemption was registered.
• Today: The legal minimum for all privately rented non-domestic properties in England and Wales is EPC E. Landlords with F or G rated properties cannot legally let them without a registered exemption.

Non-compliance carries significant financial consequences. Penalties for letting a commercial property below the minimum standard can reach £150,000 per property, linked to rateable value. Local authorities are responsible for enforcement, and alongside the financial penalty, non-compliant landlords can be named publicly on a central register.

Does MEES Apply to All Commercial Buildings?

The regulations do not cover every commercial property. Properties currently excluded include:

• Properties not legally required to have an EPC, including certain listed buildings, temporary structures and, in limited circumstances, buildings earmarked for demolition.
• Leases of six months or less, unless a right of renewal extends the term beyond that threshold.
• Leases of 99 years or more.
• Properties occupied under a licence rather than a lease.

If a property falls into one of these categories, MEES currently does not apply. For all other privately rented non-domestic properties, the minimum EPC E requirement is live.

What Changed in June 2026

On 18 June 2026, the Government published its response to consultations held in 2019 and 2021 on raising non-domestic MEES. The headline:

From 2031, all privately rented non-domestic buildings over 1,000 square metres in England and Wales must hold a minimum EPC rating of B, where cost-effective. Buildings below 1,000 square metres will remain subject to the current minimum standard of EPC E.

Two other significant decisions came with this announcement. The previously proposed interim milestone of EPC C by April 2027 has been dropped entirely. And owner-occupied commercial buildings remain outside the scope of MEES altogether.

The secondary legislation required to implement the 2031 standard is still to come. But, as several law firms and asset managers have noted, that uncertainty is not a reason to wait. Buildings that require significant retrofit work, which most of those rated D or below will, need several years of planning and installation before the deadline arrives.

What Does Reaching EPC B Require?

This is where the challenge exists. For a building to go from EPC E to B takes multiple retrofit measures, which are costly and take time to implement. Industry analysis suggests that around 73% of UK commercial property currently holds an EPC rating of C or below, meaning the vast majority of affected stock sits well short of the 2031 target. Data from the British Property Federation in early 2026 put 81% of commercial buildings across major English cities below EPC B.

Lighting upgrades and basic fabric improvements are the first step, but rarely enough to achieve EPC B on their own. For most buildings, reaching the target requires a coordinated programme involving insulation and low-carbon technologies such as heat pumps and solar PV. The specific combination depends on the building itself, which is exactly why an up-to-date EPC and a proper energy audit are the essential starting points.

Dean Wincott, Carbon3’s Director of Strategic Partnerships has over 30 years of experience in the sector.

MEES Exemptions

The regulations include a set of exemptions that allow landlords to continue letting a non-compliant property in specific circumstances. Rather than providing loopholes, the exemptions are clearly defined conditions, and each must be registered on a central government register before the letting takes place. The main exemptions for commercial properties are:

• All relevant improvements have been made. The landlord has carried out all the recommended energy efficiency measures, but the property still falls short of the required rating. This exemption lasts five years.
• The seven-year payback test. The energy savings from the recommended improvements would not cover the cost of installation over a seven-year period. This exemption lasts five years.
• Third-party consent. Improvements that require the agreement of a tenant, superior landlord, mortgagee or planning authority, where consent cannot be obtained on reasonable terms. Duration of this exemption varies.
• Property devaluation. An independent RICS-registered surveyor has confirmed that the required works would reduce the property’s value by more than 5%. This exemption lasts five years.
• Temporary exemption. The landlord has recently acquired the property under certain circumstances, for example following a lease renewal under the Landlord and Tenant Act 1954, a six-month grace period applies.

All exemptions are personal to the landlord. If someone sells a property, the new owner must register their own exemption within six months. Exemptions do not transfer on sale.

Why MEES Should Be Central to Your Asset Management Strategy

MEES compliance is often framed as a legal minimum. However, a building that cannot meet the required EPC standard by 2031 incurs more than a fine; it becomes unlettable. An unlettable asset generates no income, but continues to cost, and can be harder to sell.

The ‘Brown Discount’ Problem

Lenders and investors are increasingly applying what the industry calls a ‘brown discount’ to assets that fail to meet expected energy performance thresholds. Buildings with a clear, credible pathway to EPC B are easier to finance, buy, and sell. Those without one face compressing rental yields and shrinking buyer pools.

Lease Events as Planning Triggers

The most cost-effective window for retrofit work is almost always aligned with a lease event. A renewal, a break, or a void between tenancies is a great opportunity for retrofit works. For estates teams managing portfolios with multiple lease expiries between now and 2031, mapping those events against EPC ratings provides a timeline. Work that would cost significantly more to deliver mid-tenancy, with occupied space and operational disruption, can be planned and budgeted properly when timed to coincide with void periods.

Occupier Demand Is Moving Ahead of the Regulation

For many commercial tenants, particularly those with their own ESG commitments or Scope 3 reporting obligations, the energy performance of the buildings they occupy is now a big consideration. Not only can it help them with their own sustainability goals, they are also significantly cheaper to run. Occupiers are asking for energy data, building performance certificates and, average energy bill savings. A well-performing building is attracts more tenants, and a higher rental yield.

A Practical Roadmap to MEES 2031 Compliance

While teams can start retrofit work at any time, a clear roadmap is often more cost-effective.

Step 1: Establish your baseline (2026)

The first task is to check the current EPC rating for every asset these regulations apply to. If any certificate is more than two years old, or if the building has been modified since the last assessment, commission a fresh EPC now. Many EPCs on the national register reflect modelled assumptions that no longer match building condition. Working from inaccurate data can lead to expensive mistakes.

Step 2: Commission an EPC B Pathway Assessment (2026–2027)

An accredited non-domestic energy assessor can model the specific combination of improvements required to reach EPC B for each building. This pathways report should include cost estimates, a prioritised list of measures and a sequenced implementation plan.

Step 3: Align Works with Lease Events (2027–2029)

Once the pathway is clear, the programme can be built around the estate’s existing schedule. Your specialist contractor can begin designing a phased programme spread across five years, substantially cheaper than one compressed into the final 12 months before a deadline. Teams can also benefit from economies of scale where more than one asset is retrofitted in a programme.

Step 4: Procure and Install (2028–2030)

Specialist contractors for energy retrofits are limited, and capacity will shrink as 2031 nears due to skills gaps. Landlords who reach procurement late in the decade will face longer lead times, higher prices, and less flexibility. Earlier engagement with trusted installers is removes these budget constraints, and assists with a team’s forward planning.

Step 5: Verify and Register (2030–2031)

Once works are complete, a new EPC should be commissioned to confirm the rating improvement. Where exemptions apply, they must be registered on the PRS Exemptions Register before the property is let. A missed registration is treated the same as non-compliance.

How Renewable Energy Systems Support MEES Compliance

Achieving EPC B typically requires improvements across multiple systems simultaneously. Renewable energy technologies, particularly solar PV, battery storage and heat pumps, are increasingly central to commercial retrofit strategies.

Solar PV reduces carbon emissions as businesses can now generate their own clean energy, lowering reliance on fossil fuels. Many commercial buildings have flat roofs, perfect for flat roof solar installations. Battery storage, when paired with solar, extends the usable benefit of on-site generation. Heat pumps replace fossil-fuel heating systems, which can produce substantial EPC rating improvements in buildings where heating is a significant energy load. Combined with fabric improvements, these technologies form a practical route to EPC B for many commercial buildings.

Importantly, the financial case for these technologies has strengthened independently of MEES. Fixed energy costs, reduced exposure to grid price volatility, and potential revenue from exported power all improve the payback calculation. This matters when assessing whether improvements pass the seven-year payback test required to avoid the exemption route.

See our case studies to find out how we’ve achieved EPC B for other businesses.

Funding MEES Compliance

Capital cost is consistently cited as the primary obstacle to energy efficiency improvements. Several funding mechanisms exist for commercial landlords, though availability and eligibility may vary:

• Fully-funded solar. Some specialist providers offer fully-funded installation at zero upfront cost, with the revenue from energy savings used to service the arrangement. See if your assets qualify for fully-funded solar.
• Green finance and sustainability-linked loans. Many lenders now offer preferential terms for energy efficiency improvements, including retrofit mortgages and green business loans tied to EPC improvements.
• Capital allowances. Energy efficiency investments can qualify for capital allowances, reducing the effective cost of works. The extent of relief depends on the nature of the measures and the structure of the investment.
• Service charge recovery. For multi-let buildings, some MEES-related costs may be recoverable through the service charge.

The right funding structure depends on the specific asset, the lease arrangement, and the landlord’s balance sheet position.

Frequently Asked Questions

The Time to Plan Is Now

Five years sounds like a long time to plan and retrofit. It isn’t when you account for the time required to commission accurate EPCs, develop pathways reports, align works with lease events, navigate procurement, and actually install the measures.

Contractor capacity will not scale at the speed the compliance calendar demands. Landlords and estates managers who begin their assessment now will have choices. Those who start in 2029 will have far fewer.

Carbon3 works with estates teams and asset managers across England and Wales to assess energy performance, design retrofit programmes, and install renewable technologies. If your portfolio includes buildings over 1,000 square metres and your current EPC ratings are below B, we can help you understand your next steps. Contact us today.