Back To Blogs
March 5, 2026
Joe Averill
10 minutes
If you rent out commercial property in England or Wales, you need to know about MEES regulations and EPC ratings. These rules set the minimum energy efficiency standard your building must meet before you can legally let it. Right now, that minimum is EPC band E. But it is expected to rise to C and then B in the coming years.
Getting this wrong is expensive. Fines can reach up to 150,000 pounds per property. And beyond penalties, buildings with poor energy ratings are already harder to let, command lower rents, and face the real risk of becoming "stranded assets" that no tenant wants.
This guide covers everything commercial landlords and renters need to know: what the rules are today, what is changing, how penalties work, and exactly what you can do to improve your EPC rating.
MEES stands for Minimum Energy Efficiency Standards. These regulations were introduced through the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015, made under powers granted by the Energy Act 2011.
In plain terms, MEES makes it illegal to let a commercial property that falls below a minimum EPC rating. The rules apply to landlords of privately rented properties in England and Wales, covering both commercial and domestic buildings that are required to have an Energy Performance Certificate.
Why do these rules exist? Energy used in non-domestic buildings accounts for roughly 12% of the UK's total carbon emissions. And around 60% of the commercial buildings standing today will still be in use in 2050. By targeting the worst-performing properties first, the government aims to reduce emissions, lower energy costs for tenants, and push the entire commercial property market toward better efficiency.
MEES applies to any property let under a qualifying tenancy where a valid EPC is required. That covers most standard commercial leases. But there are some exceptions:
Since most commercial lettings trigger an obligation to obtain an EPC anyway, very few landlords can sidestep these rules in practice.
The current minimum EPC rating for commercial property is band E. Any property rated F or G is classified as "sub-standard" and cannot lawfully be let.
This requirement was phased in across two stages:
| Date | What Changed |
|---|---|
| 1 April 2018 | Landlords could not grant new leases, renewals, or extensions for F or G rated properties |
| 1 April 2023 | The ban extended to all existing commercial leases, not just new ones |
Since April 2023, landlords cannot continue to let any commercial property rated below E, regardless of when the tenancy started. If your building is sub-standard, you have three options:
It is worth noting that a MEES breach does not invalidate the lease itself. The tenancy remains in force. But the landlord becomes exposed to civil penalties and, increasingly, reputational risk.
The government has been clear about its intention to raise the minimum standard significantly. But the timeline has become a source of real frustration for the industry.
Following a 2021 consultation, the government proposed:
Some 91% of consultation respondents supported the EPC B target. The December 2020 Energy White Paper confirmed this direction.
Here is the honest picture. As of early 2026, the government's formal response to that 2021 consultation has never been published. The proposed tighter standards have not been enacted into law. The legally enforceable minimum remains EPC E.
The previous government acknowledged before leaving office that "the proposed timelines within the original consultation will require updating." When Labour took power in July 2024, the issue was inherited but not prioritised. The January 2026 Warm Homes Plan dealt with domestic EPC standards but gave no update at all on commercial property.
The British Property Federation described this silence bluntly, saying the plan left commercial landlords without any clarity on what comes next.
Despite the policy vacuum, industry experts broadly agree on the likely outcome:
This matters because roughly 81% of commercial buildings in major English cities currently sit below EPC B. The scale of the upgrade challenge is enormous, and waiting for final legislation before acting risks compressed timelines, higher costs, and scarce contractor availability.
Our advice: Do not wait for final confirmation. The cost of early action is far lower than the cost of last-minute compliance.
An Energy Performance Certificate rates a building's energy efficiency from A (most efficient) to G (least efficient). For commercial properties, the bands use a numerical scale:
| EPC Band | Score Range | What It Means |
|---|---|---|
| A | 0 to 25 | Exceptional efficiency |
| B | 26 to 50 | Very good |
| C | 51 to 75 | Good |
| D | 76 to 100 | Average (benchmark) |
| E | 101 to 125 | Below average, current legal minimum |
| F | 126 to 150 | Poor, unlettable |
| G | 151+ | Very poor, unlettable |
There is an important difference between domestic and commercial EPCs. Domestic ratings are based on estimated running costs. Commercial EPC ratings are based on estimated carbon dioxide emissions. This distinction matters when planning improvements.
Most commercial buildings are assessed using the Simplified Building Energy Model (SBEM), a government-approved tool developed by BRE. It evaluates:
The SBEM compares your building against a "notional building" of the same size and shape built to a reference specification. More complex buildings, such as those with atria or sophisticated ventilation systems, require Dynamic Simulation Modelling (DSM) instead.
In June 2022, the SBEM methodology was updated (version 6.1) with revised carbon factors for grid electricity. Because the UK's power grid has become significantly greener since 2013, the carbon factor for electricity dropped by roughly 56.6%.
What does this mean in practice? Buildings heated by electricity now score better than before. Some properties can achieve an improved EPC rating simply by commissioning a new assessment under the updated methodology, with no physical changes at all. If your building holds a pre-2022 EPC, it is well worth getting a fresh assessment.
The recommendations report is particularly useful. It groups suggested improvements by payback period and gives you a ready-made roadmap for lifting your rating. If you are working toward an energy efficient office building, the EPC recommendations report is a good starting point.
MEES penalties are civil, not criminal. But they are serious enough to get your attention.
Enforcement sits with local weights and measures authorities, which are essentially the trading standards teams within local councils.
| Breach Duration | Penalty |
|---|---|
| Less than 3 months | Greater of 5,000 pounds or 10% of rateable value, capped at 50,000 pounds |
| 3 months or more | Greater of 10,000 pounds or 20% of rateable value, capped at 150,000 pounds |
| False information on the PRS Exemptions Register | Up to 5,000 pounds |
| Failure to comply with a compliance notice | Up to 5,000 pounds |
In multi-let buildings, penalties apply per lease. So if you have a building with five separate tenancies, your total exposure could be five times the single-property cap. Across a portfolio, this adds up fast.
Beyond the financial hit, authorities can also impose publication penalties. This means your name, the details of the breach, and the fine amount get listed publicly on the PRS Exemptions Register. For landlords with institutional investors or high-profile portfolios, the reputational damage can outweigh the fine itself.
In practice, MEES enforcement has been very limited so far. Nottingham City Council is the most active enforcer nationally, having investigated around 1,800 properties and issued 14 penalty notices, mostly in the domestic sector. The Mayor of London confirmed that no MEES penalties had been issued across the entire capital as of 2019. Most local authorities simply lack the resources.
But this is expected to change. The government is working on a centralised compliance database that would make non-compliant properties far more visible to enforcement teams. Relying on weak enforcement as a strategy is risky and short-sighted.
Improving the EPC rating of an office or commercial building is not about doing everything at once. It is about tackling the most cost-effective measures first and phasing larger investments over time.
LED lighting is typically the single best starting point. Replacing fluorescent tubes and halogen fittings with LEDs costs around 5 to 20 pounds per fixture, cuts lighting energy use by up to 90%, and usually pays for itself within one to three years. Adding motion sensors and daylight-linked controls makes it even better.
Draught-proofing is another easy win. Sealing gaps around doors, windows, and service penetrations costs as little as 100 to 300 pounds. It is low-disruption and improves both the EPC score and tenant comfort.
Heating controls and hot water cylinder insulation are cheap upgrades that directly affect the EPC calculation. Programmable thermostats and thermostatic radiator valves cost relatively little but signal to the assessor that energy is being managed actively.
Insulation delivers some of the most substantial EPC improvements available. Wall, roof, and floor insulation reduces heat loss directly. Around a third of heat in an uninsulated building escapes through the walls. For warehouses and industrial units with large external surface areas, insulation or cladding upgrades can be transformative.
Building Management Systems (BMS) provide smart, automated control of heating, cooling, lighting, and ventilation. For larger offices, a BMS can cost several thousand to tens of thousands of pounds but delivers ongoing energy savings and directly contributes to a better rating. If you are interested in broader principles, our sustainable office design guide covers this in more detail.
HVAC upgrades address what is usually the single largest component in the EPC calculation. Replacing ageing gas boilers with modern condensing units, installing heat recovery ventilation, or switching to air-source heat pumps can dramatically shift a rating. The Boiler Upgrade Scheme provides a 7,500 pound grant toward heat pump installations.
Renewable energy, particularly rooftop solar PV, gets direct credit in the SBEM calculation. It can push borderline ratings into the next band and reduces long-term energy costs at the same time.
Window upgrades from single glazing to double or triple glazing reduce heat loss and improve comfort. The cost for heavily glazed commercial buildings is significant, but the EPC impact is meaningful, especially when combined with other fabric improvements.
Industry estimates give a rough guide:
| Upgrade Path | Estimated Cost |
|---|---|
| EPC D to C | 10 to 25 pounds per square foot |
| EPC D to B | 36 to 65 pounds per square foot |
Across the national commercial stock, the total bill is substantial. Avison Young estimates a 30.5 billion pound cost just to bring industrial buildings to the proposed 2030 standard. But spreading these costs over time, aligning them with planned refurbishments, and taking advantage of grants and tax relief makes them much more manageable. For a wider look at cutting energy costs and emissions, see our guide on how to reduce your office carbon footprint.
The regulations include several exemptions. But they come with strict rules. Every exemption must be registered on the PRS Exemptions Register before you can rely on it. Registration is self-certified, and most exemptions last five years before expiring.
This exemption is unique to commercial property. If the cost of a recommended energy efficiency improvement cannot be recouped through energy bill savings within seven years, it is not considered a "relevant" improvement and does not have to be installed.
To claim this exemption, you need three quotes from qualified installers as evidence. If all relevant improvements fail the payback test and the property remains sub-standard, you can register an "all improvements made" exemption.
This is widely considered the most commonly used exemption. It applies where a required improvement needs consent from a third party, such as a tenant, a superior landlord, a planning authority, or a mortgage lender, and that consent is refused or granted with unreasonable conditions.
Important: If the current tenant specifically refuses consent, the exemption only lasts while that tenant remains in occupation. Before any new letting, the improvement must be carried out.
This requires a report from an RICS-registered independent surveyor confirming that a specific improvement would reduce the property's market value by more than 5%.
Applies where cavity, external, or internal wall insulation would damage the building's fabric or structure. You need written support from an accredited conservation architect, chartered engineer, or building surveyor.
This covers situations where someone becomes a landlord unexpectedly, for example by purchasing an already-let property or through a court-ordered lease. It lasts six months only. After that, the landlord must either improve the property or register a substantive exemption.
Despite the uncertainty around exact dates, the strategic picture is clear. The minimum standard will rise. Landlords who act now will pay less, have better access to contractors, and avoid periods where their property cannot be let.
1. Audit your portfolio. Check every property's current EPC rating on the GOV.UK register. Flag any certificates nearing their 10-year expiry.
2. Reassess pre-2022 EPCs. If any of your buildings were assessed before June 2022, commission a fresh EPC under the updated SBEM methodology. The revised carbon factors mean some properties will score better with no physical changes.
3. Start with "no regret" measures. LED lighting, draught-proofing, heating controls, and hot water insulation are cheap, deliver fast payback, and improve ratings regardless of what happens with future regulations.
4. Review your lease documentation. Incorporate green lease provisions into all new and renewed leases. These should cover energy data sharing, restrictions on tenant works that would worsen the EPC, landlord access for energy assessments, and clear cost allocation for improvements. The Better Buildings Partnership's Green Lease Toolkit offers industry-standard templates.
5. Phase major works strategically. Align insulation upgrades, BMS installation, and HVAC improvements with planned refurbishments, lease breaks, or tenant changeovers. This is cheaper and less disruptive than standalone energy projects.
6. Explore funding options. Enhanced Capital Allowances provide 100% first-year tax relief on qualifying energy-saving equipment. The Boiler Upgrade Scheme offers 7,500 pounds for heat pumps. Local authority grants, green business loans, and the Industrial Energy Transformation Fund can all help offset costs.
7. Think about the EPC B target. Even if the deadline shifts to 2033 or 2035, it makes sense to plan for B-level efficiency when doing major works now. Retrofitting twice is always more expensive than doing it once to a higher standard.
The commercial property market is splitting into two lanes. Buildings with strong energy credentials command premium rents and attract quality tenants. Buildings with poor ratings face brown discounts, limited demand, and, eventually, a legal ban on letting.
Whether the EPC B deadline lands in 2030 or 2035, the gap between compliant and non-compliant buildings will only widen. Starting early is not just about avoiding penalties. It is about protecting the long-term value of your assets.
For a broader view of how energy efficiency connects to overall sustainable office space strategy, our complete guide covers certifications, design, and practical next steps. And if you are planning a physical upgrade, our sustainable office fit out and refurbishment guide walks through the process in detail.
Want to find your next leased, managed or serviced office space to rent? Book a call with our team today.
.jpg)