MEES Explained: Minimum Energy Efficiency Standards
MEES ties a building's lettability to its EPC rating, which makes it one of the few energy regulations with immediate commercial consequences. The roadmap changed in 2026, so this guide sets out what applies now, what is proposed, and what the evidence requirements mean for an estates team.
In short
MEES — the Minimum Energy Efficiency Standards — restrict landlords from letting property below a minimum EPC rating. For non-domestic private rented property in England and Wales the current minimum is EPC E, with exemptions available where improvements are not cost-effective.
What applies now
The current requirement for non-domestic private rented property in England and Wales is a minimum EPC rating of E. This applies to continuing lettings, not only to new lettings, so a landlord holding a sub-E property under an existing lease is already exposed rather than merely facing a problem at renewal. Enforcement sits with local authorities, and penalties are calculated by reference to rateable value.
A 2026 change tightened the evidence side: a valid EPC must now be in place at the point a property is marketed for sale or let, removing the previous grace period that allowed one to follow shortly afterwards. In practice that moves the assessment earlier in the transaction and makes an expired certificate a live obstacle rather than an administrative catch-up.
- Minimum EPC E for non-domestic private rented property in England and Wales
- Applies to continuing lettings, not just new ones
- A valid EPC must be in place when marketing for sale or let
- Enforced by local authorities, with penalties linked to rateable value
The changed roadmap
The trajectory has shifted, and this is where out-of-date guidance is actively misleading. An interim milestone of EPC C by 2027 was consulted on and has not been taken forward. The current proposal is a higher standard of EPC B from 2031, applying to privately rented non-domestic buildings over 1,000 square metres, where cost-effective. Buildings below that threshold would continue at the current EPC E minimum.
For estates teams the planning consequence is a longer runway than the earlier roadmap implied, and a size threshold that did not previously exist. A portfolio should be segmented on that 1,000 m² line, because the investment case for a large building facing EPC B in 2031 is different from a small one that remains at E. Anything still working to a 2027 EPC C deadline is planning against a milestone that was dropped.
- The previously consulted EPC C milestone for 2027 was not taken forward
- Proposed EPC B from 2031 for non-domestic PRS buildings over 1,000 m²
- Buildings under 1,000 m² remain at the EPC E minimum under current proposals
- Existing flexibility mechanisms including the seven-year payback test remain
Exemptions and the evidence behind them
MEES is not an absolute prohibition. Exemptions exist where relevant improvements would not meet a cost-effectiveness test, where a third party withholds necessary consent, or where the improvement would devalue the property, among others. Exemptions must be registered on the PRS Exemptions Register and are time-limited rather than permanent, so they need active management rather than filing and forgetting.
The practical burden is evidential. Claiming an exemption means holding the assessment that supports it — the recommendation report, the quotes or payback calculation, the refused consent — and being able to produce it. That documentation is exactly the kind that gets created by a consultant during a transaction and then disappears into a project folder. Where a portfolio carries multiple exemptions with different expiry dates, keeping the underlying evidence findable is the difference between a defensible position and an unprovable one.
Related maintenance checklists
How this applies by sector
Further reading
Compliance & CAFM
Track EPCs on a compliance register
PM Assist's building compliance software holds this duty on a register for every building you manage, included in every paid plan.
- Energy Performance Certificate sits on the compliance register, showing when it was last done, when it is next due and the certificate behind it.
- Duties with no record held are listed as gaps, so nothing is missed just because nobody logged it.
- AI reads your certificates and proposes the dates and remedial actions; a person checks them against the source document before they count.
Sources
The regulatory positions on this page come from the following primary sources. Where guidance and legislation differ, the legislation governs — always confirm the requirements that apply to your own site and jurisdiction.
Frequently asked questions
What EPC rating do commercial landlords need?
Is the EPC C requirement for 2027 still happening?
What MEES exemptions are available?
Does MEES apply to buildings that are not let?
Keep energy evidence findable
EPCs, recommendation reports, exemption evidence, and improvement records searchable together — so a MEES position can be evidenced rather than asserted.
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