What Is MEES? Office EPC C 2027 Rule Explained
Last updated: 17 October 2026
MEES (the Minimum Energy Efficiency Standards) is the legal framework setting the lowest Energy Performance Certificate, or EPC, rating a commercial property can hold before being let. The proposed EPC C by 2027 deadline for offices was scrapped in the UK government's June 2026 interim response, replaced with a planned EPC B requirement by 2031 for buildings over 1,000 square metres.
Key Takeaways
- Priority First notes that MEES currently requires most let commercial buildings, including offices, to hold a minimum EPC rating of E, under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015.
- Priority First highlights that the government's June 2026 interim response confirmed the EPC C by 2027 milestone has been dropped, with a revised EPC B target proposed for larger buildings by 2031.
- Offices account for 48% of all F- and G-rated non-domestic buildings lodged under MEES in the past five years, according to Search Acumen research cited by Willmott Dixon Interiors (2026).
- A Deloitte survey found that 10% of London's office buildings do not meet the required EPC E standard, as reported by Energy Advice Hub (2026).
- Non-compliance penalties for breaches lasting three months or more reach up to £150,000, per Coventry City Council Trading Standards (2026).
What is MEES?
MEES is the shorthand for the Minimum Energy Efficiency Standards, a legal requirement under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015 that bans landlords from granting or continuing certain tenancies on non-domestic buildings below a set EPC rating. An EPC, or Energy Performance Certificate, scores a building from A (most efficient) to G (least efficient) based on its estimated energy use.
Since April 2023, MEES has applied to all existing commercial tenancies, not just new or renewed ones. A landlord cannot lawfully continue letting an office rated F or G unless a valid exemption is registered on the PRS Exemptions Register.
This is distinct from the EPC B 2027 or 2030 proposals that circulated for several years. Those were draft milestones under consultation, never fully enacted, and the most recent one for offices — EPC C by 2027 — was formally dropped by government in 2026.
Does your office still need an EPC rating of C by 2027?
No. The UK government's interim response of 18 June 2026 confirmed the proposed EPC C by 2027 milestone for non-domestic private rented property has been scrapped. Offices and other commercial lettings currently remain bound only by the existing EPC E minimum under MEES, with no statutory EPC C requirement in force or scheduled.
This reverses years of market planning built around the earlier 2021 consultation, which proposed EPC C by 2027 and EPC B by 2030. Landlords who had already budgeted retrofit work against that 2027 date are now working to a longer, differently structured timeline.
The revised proposal instead targets EPC B by 2031, but only for non-domestic buildings over 1,000 square metres — a threshold that excludes many smaller office units entirely. Secondary legislation confirming the detail of this threshold and compliance mechanism has not yet been laid before Parliament, so the 2031 target remains a government proposal rather than binding law.
What EPC standard applies to offices right now?
Priority First notes that offices let under a commercial tenancy must currently hold a minimum EPC rating of E to be lawfully let, under the 2015 MEES Regulations as they stand today. This E-rating floor has applied to all existing lets since 1 April 2023, closing the loophole that previously let sub-standard buildings continue under pre-existing tenancies.
Despite this long-standing minimum, compliance gaps persist across the London office market. A Deloitte survey found that 10% of London's office buildings do not meet the required EPC E standard, according to Energy Advice Hub (2026) — a sizeable minority given the regulation's three-year-plus maturity.
Offices are also disproportionately represented among the worst-performing stock nationally. Offices account for 48% of all F- and G-rated non-domestic buildings lodged under MEES over the past five years, per Search Acumen research cited by Willmott Dixon Interiors (2026) — the single largest property-type share in that dataset.
What will the EPC B 2031 proposal mean when it becomes law?
The EPC B by 2031 proposal would require non-domestic rented buildings over 1,000 square metres to hold a minimum EPC B rating by that date, according to the government's June 2026 interim response and legal analysis from Jones Day. Smaller offices, under that floor area, would sit outside this specific tightening for now.
Historical scoping for the office sector suggests the scale of work ahead is considerable even under a relaxed timetable. 80% of London's office buildings sit below the proposed future minimum EPC standard and will need upgrading, equivalent to 15 million square feet of retrofit per year, according to the Deloitte London Office Crane Survey, cited by Concept Energy (2022).
The government has signalled a preference for fewer, larger retrofit projects over repeated incremental work. Analysis by Simmons & Simmons summarised the government's view that landlords should consider undertaking "one larger retrofit to meet the EPC B requirement ahead of 2030 where this proves cost effective" rather than chasing interim milestones separately.
Original 2021 proposal vs June 2026 revised proposal
| Milestone | Original 2021 proposal | June 2026 revised proposal |
|---|---|---|
| Interim target | EPC C by 2027, all non-domestic lets | Scrapped entirely |
| Final target | EPC B by 2030 | EPC B by 2031 |
| Scope | All non-domestic rented buildings | Buildings over 1,000 sq m only |
| Legal status | Consultation proposal, never enacted | Interim government response; secondary legislation pending |
What happens if an office breaches MEES?
A landlord who lets a sub-standard office in breach of MEES faces a financial penalty set according to how long the breach lasts. Breaches lasting under three months carry a fine of the greater of £5,000 or 10% of rateable value, capped at £50,000, according to Blandy & Blandy (2021).
Longer breaches attract substantially higher penalties. Non-compliance penalties for breaches of three months or more run up to the greater of £10,000 or 20% of rateable value, capped at £150,000, per Coventry City Council Trading Standards (2026).
Beyond fines, local authorities can publish non-compliance on the public PRS Exemptions Register, and affected tenants may have grounds to challenge service charge recovery for inefficient space. Landlords should check their EPC status via the official GOV.UK Find an Energy Certificate register before any lease event.
What are the wider costs and benefits of retrofit?
Retrofit investment carries an upfront cost, but government modelling points to material long-term savings for occupiers. The government estimates tenants in larger non-domestic buildings could save up to £360 million per year in energy bills by 2031, according to Lexology (Stevens & Bolton Viewpoints) (2026).
The retrofit backlog is not confined to offices. Research from Savills found that 185 million square feet of UK retail space does not meet the required MEES standards, as reported by Energy Advice Hub (2026), underlining that non-compliance is a sector-wide issue rather than an office-specific one.
Deloitte's own Crane Survey commentary notes that occupier expectations are now driving timelines faster than regulation alone, observing that "tenants' own commitments to sustainability have redefined what offices they want to occupy in the future and how quickly they need to move to achieve those targets," as cited by Concept Energy.
Building compliance into day-to-day facilities operations
MEES compliance does not sit in isolation from how a building is run day to day. An office that meets its EPC rating on paper can still slip through poor maintenance logging, uncoordinated contractor access during retrofit works, or gaps in who holds responsibility for building records.
This is where integrated facilities management earns its keep: coordinating compliance documentation, contractor access, and building upkeep under one accountable party rather than several disconnected suppliers. Priority First's facilities management service exists precisely to close that gap for commercial landlords managing compliance alongside daily operations.
Your MEES compliance checklist
- Check your office's current EPC rating on the official GOV.UK Find an Energy Certificate register.
- Confirm your building is rated E or above before granting or renewing any commercial tenancy.
- Register a valid exemption on the PRS Exemptions Register if your building cannot reasonably be improved.
- Assess whether your office exceeds 1,000 square metres, the proposed threshold for the EPC B 2031 rule.
- Model retrofit costs against the government's suggested seven-year payback test before committing to works.
- Monitor the government's secondary legislation for the final EPC B 2031 rules rather than assuming the 2021 timetable still applies.
- Coordinate retrofit contractor access and building compliance records through a single facilities partner.
- Review service charge clauses with tenants if retrofit costs are to be recovered.
FAQ
What does MEES stand for?
MEES stands for the Minimum Energy Efficiency Standards, the UK legal framework under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015 that sets minimum EPC requirements for rented commercial buildings.
Is the EPC C by 2027 office deadline still happening?
No, it has been scrapped. The government's 18 June 2026 interim response formally dropped the proposed EPC C by 2027 milestone for non-domestic private rented property.
What EPC rating does an office need right now?
An office currently needs a minimum EPC rating of E to be lawfully let under existing MEES rules, a requirement that has applied to all existing tenancies since 1 April 2023.
Will offices need an EPC B rating in future?
The government has proposed EPC B by 2031 for non-domestic buildings over 1,000 square metres, but this is not yet law and secondary legislation is still pending.
Does the EPC B 2031 proposal apply to small offices?
It would not apply to offices under the proposed 1,000 square metre threshold, based on the government's June 2026 interim response, though final scope depends on legislation yet to be laid.
What are the penalties for letting a non-compliant office?
Breaches under three months carry fines up to the greater of £5,000 or 10% of rateable value, capped at £50,000, while breaches of three months or more rise to the greater of £10,000 or 20% of rateable value, capped at £150,000.
Where can I check my building's EPC rating?
You can check any registered EPC rating free of charge on the official GOV.UK Find an Energy Certificate service.
Keeping your office compliant while Priority First manages the day-to-day
Navigating MEES deadlines is only part of running a compliant, well-managed office — contractor access for retrofit works, maintenance records, and building security all need coordinating alongside any energy upgrade. Priority First works with commercial landlords and occupiers across prime central London, including Chelsea, Knightsbridge and Mayfair, to keep buildings secure and operationally sound while compliance work is underway.
Priority First's facilities management teams coordinate building upkeep and compliance documentation alongside security operations, giving landlords a single accountable partner rather than a patchwork of suppliers during retrofit periods. Across the properties it manages, Priority First has protected over £1.6 billion in client assets with a 100% customer satisfaction rate.
If your office is approaching a lease event, retrofit project, or compliance review, get in touch with Priority First to discuss facilities management support tailored to your building.
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