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March 5, 2026
Joe Averill
10 minutes
If you rent or let commercial property in England or Wales, you need to know about MEES regulations and EPC ratings. These rules set the minimum energy efficiency standard a building must meet before it can legally be let. 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 on both sides of the lease. Landlords face fines of up to 150,000 pounds per property. Tenants end up in buildings that cost more to run, are less comfortable to work in, and risk disruptive upgrade works mid-tenancy. Buildings with poor energy ratings are already harder to let, command lower rents, and face the real risk of becoming "stranded assets."
This guide covers everything tenants and landlords need to know: what the rules are today, what is changing, how penalties work, what to look for when choosing an office, and how to improve a rating that falls short.
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 occupiers, 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:
If you are signing a typical office lease, MEES almost certainly applies.
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:
For landlords: Since April 2023, you 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:
For tenants: If you are currently in a property rated F or G, your lease is still valid. MEES does not invalidate existing tenancies. But your landlord is technically in breach and could face penalties. More practically:
A MEES breach does not invalidate the lease itself. The tenancy remains in force. But the landlord becomes exposed to civil penalties and reputational risk, and the tenant lives with the consequences of an inefficient building.
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 would need 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 as leaving the commercial market 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.
For landlords: Waiting for final legislation before acting risks compressed timelines, higher contractor costs, and periods where the property cannot be let. Early action is cheaper.
For tenants: This shift creates both risk and opportunity. If you sign a long lease on a building rated D or E, you could face disruption when the landlord is forced to carry out upgrade works mid-tenancy. You could also end up in a building that loses tenant appeal over time. On the other hand, buildings that already meet EPC B or above will be increasingly sought-after. Choosing one now puts you ahead of the curve, with lower energy costs and a workspace that supports your sustainability goals.
The takeaway: Whether you are letting or renting, 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:
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 the 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, require Dynamic Simulation Modelling (DSM) instead.
It is worth noting that an EPC is just one measure of building performance. Certifications like BREEAM and WELL take a much broader view, covering water use, biodiversity, occupant health, and more. Our green building certifications guide explains how they compare and which ones matter most.
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 you are a landlord with a pre-2022 EPC, it is well worth getting a fresh assessment. If you are a tenant looking at a building with an older certificate, it is worth asking whether the landlord has reassessed under the updated methodology.
The recommendations report is particularly useful for both sides. For landlords, it provides a ready-made roadmap for lifting a rating. For tenants, it shows what improvements could be made and how quickly they would pay for themselves, which is strong leverage when negotiating a lease. If you are evaluating offices and energy efficiency is a priority, our guide to energy efficient office buildings covers what to look for in more detail.
Before getting into penalties and improvements, it is worth pausing on how the EPC rating actually shows up in your working life as an occupier. This is often overlooked.
A poorly rated building is simply more expensive to run. Inadequate insulation means higher heating costs in winter and potentially higher cooling costs in summer. Outdated lighting wastes electricity. Inefficient HVAC works harder for less. The difference between a D-rated and a B-rated office of the same size can be significant on annual energy costs.
In multi-let buildings, energy costs for common areas, lobbies, lifts, and shared HVAC often flow through the service charge. If the building is inefficient, every tenant pays more. When comparing offices, look at total occupancy cost (rent plus energy plus service charge), not just headline rent.
Poor energy efficiency usually means poor thermal comfort. Drafty offices, cold spots near windows, overheating in summer, and inconsistent temperatures all affect concentration and morale. Research consistently links workplace thermal comfort with productivity and employee satisfaction. Our workplace wellbeing and sustainable offices guide explores this connection further.
More and more businesses need to report on their environmental impact. Occupying a poorly rated building makes your Scope 2 and Scope 3 emissions harder to manage. Choosing a highly rated office is one of the simplest ways to reduce your reported carbon footprint. See our guide on how to reduce your office carbon footprint for practical steps.
Knowing how EPC and MEES work gives you a real advantage when searching for office space. Here is what to check before you sign.
1. Ask for the EPC certificate. Every commercial property being marketed for let must have a valid EPC. If the agent or landlord cannot produce one, that is a red flag. Check the rating and the expiry date.
2. Aim for EPC B or above. This future-proofs you against upcoming MEES changes, avoids the risk of mid-lease disruption from mandatory upgrade works, and gives you lower running costs from day one.
3. Check when the EPC was issued. A pre-June 2022 EPC may not reflect the current methodology. A building rated D under the old assessment might achieve a C or B under the updated one.
4. Read the recommendations report. This tells you what improvements could be made and how quickly they would pay for themselves. If the building is rated D but shows a potential B with relatively simple works, you have strong leverage. Ask the landlord to carry out improvements before you commit, or negotiate on rent.
5. Look at the building's systems on the viewing. LED lighting, modern HVAC, double or triple glazing, good insulation, and a building management system are all signs of an efficient building. Fluorescent tubes and single glazing are warning signs.
6. Negotiate green lease clauses. These are provisions that set out shared responsibilities for energy performance. Be open to clauses covering energy data sharing, restrictions on works that would worsen the EPC, landlord obligations to maintain or improve the rating, and clear cost allocation. If your landlord proposes green lease terms, it is usually a good sign. It means they are thinking about long-term performance, not just the next rent review.
For a broader perspective on what makes an office genuinely sustainable, our guide to sustainable office design covers the full picture.
MEES penalties are civil, not criminal. But they are serious enough to get any landlord's attention, and they have downstream consequences for tenants too.
Enforcement sits with local weights and measures authorities, which are essentially the trading standards teams within local councils.
In multi-let buildings, penalties apply per lease. So a landlord with five separate tenancies could face five times the single-property cap.
Beyond the financial hit, authorities can also impose publication penalties, listing the landlord's name, the breach details, and the fine on the publicly accessible PRS Exemptions Register. For tenants, this also means your business address could appear on a public register of non-compliant properties, which is not a good look.
If you are renting from a non-compliant landlord, the knock-on effects can be real:
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. This section is most directly aimed at landlords, but tenants benefit from knowing what is possible (and at what cost) when negotiating who pays for what.
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.
Draught-proofing is another easy win. Sealing gaps around doors, windows, and service penetrations costs as little as 100 to 300 pounds. Low-disruption and effective.
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 active energy management.
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.
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 savings.
HVAC upgrades address what is usually the single largest component in the EPC calculation. Replacing ageing gas boilers with 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.
Window upgrades from single to double or triple glazing reduce heat loss and improve comfort. The cost for heavily glazed buildings is significant, but the EPC impact is meaningful when combined with other fabric improvements.
Industry estimates give a rough guide:
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. Spreading costs over time, aligning them with planned refurbishments, and using grants and tax relief makes them more manageable. If you are planning a sustainable office fit out, aligning energy improvements with the works is far cheaper than tackling them separately.
The regulations include several exemptions. But they come with strict rules. Every exemption must be registered on the PRS Exemptions Register before a landlord can rely on it. Registration is self-certified, and most exemptions last five years before expiring.
Tenants should also pay attention here, because exemptions affect the building you occupy.
This exemption is unique to commercial property. If the cost of a recommended 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. Three quotes from qualified installers are required as evidence.
Tenant note: This is the most common route landlords use to avoid expensive upgrades. From your perspective, it means the building stays inefficient and your energy bills stay higher.
This is widely considered the most commonly used exemption. It applies where a required improvement needs consent from a third party (a tenant, superior landlord, planning authority, or mortgage lender) and that consent is refused or granted with unreasonable conditions.
Tenant note: Think carefully before refusing consent for energy efficiency works. If you block improvements, you are stuck with higher running costs. The exemption only lasts while you remain in occupation, so refusing consent does not save the landlord money long-term, but it does cost you in the meantime. If the current tenant specifically refuses, the improvement must be carried out before any new letting.
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. Requires written support from an accredited conservation architect, chartered engineer, or building surveyor.
Covers situations where someone becomes a landlord unexpectedly, for example by purchasing an already-let property. Lasts six months only.
Despite the uncertainty around exact dates, the strategic picture is clear. The minimum standard will rise. Both sides of the lease benefit from acting early.
When searching:
When negotiating a lease:
During and at end of tenancy:
Right now:
Next 1 to 3 years:
The commercial property market is splitting into two lanes. Buildings with strong energy credentials command premium rents, attract quality tenants, and hold their value. Buildings with poor ratings face brown discounts, weaker demand, disruptive upgrade works, and eventually a legal ban on letting.
Whether you are renting or letting, the EPC rating should be part of your decision-making. For tenants, it is one of the simplest signals of how much your office will really cost and how well it will support your business. For landlords, it is a measure of how future-proof your asset is.
Whether you are looking for a permanent office, flexible workspace, or sustainable coworking space, EPC and MEES knowledge gives you the tools to make a smarter choice. For a complete overview of what makes an office genuinely sustainable, our sustainable office space guide covers certifications, design, and practical next steps.
Want to find your next leased, managed or serviced office space to rent? Book a call with our team today.
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