MEES and EPC B 2031: What Commercial Landlords Must Actually Do

Most of what is written about MEES and commercial property is out of date, and a lot of it was never right in the first place. If you are a landlord trying to work out what you are actually obliged to do — and by when — the noise is genuinely dangerous, because the wrong deadline drives the wrong capital decision. This page sets out the position as it stands in June 2026, separates the binding law from the proposals, and gives you a practical sequence for getting ahead of it.

The only MEES rule that is currently law

There is one binding standard, and it has been in force for three years. Since 1 April 2023 it has been unlawful to continue letting a commercial property in England and Wales with an EPC rating below E. That applies to sitting tenants, not just new lettings — the 2023 trigger swept in every existing lease. The earlier date of 1 April 2018 applied only to new lettings and renewals. So if you are letting a sub-E asset today, you are already in breach, regardless of when the lease started.

Note the geography. The Minimum Energy Efficiency Standard (MEES) under the Energy Efficiency (Private Rented Property) Regulations covers England and Wales only. Scotland and Northern Ireland run separate regimes.

That is the whole of the current legal obligation: EPC E, since 1 April 2023, England and Wales. Everything beyond that is proposal, not law.

Why competitors quote it wrong

Walk through a dozen commercial solar or property-services websites and you will see “EPC C by 2027” and “EPC B by 2030” stated as fact. Both are wrong, and it is worth understanding why, because the same confusion may be sitting in your own internal compliance notes.

The 2027 and 2030 dates came from a 2019–2021 government consultation on a proposed trajectory for non-domestic minimum standards — interim EPC C by 1 April 2027, then EPC B by 1 April 2030. That trajectory was a consultation, never legislation. The EPC C by 2027 milestone was subsequently scrapped. The EPC B by 2030 milestone was never law and was dropped with it. Sites still quoting those dates are quoting a roadmap that the government abandoned, then republishing it as a hard deadline.

The reason this matters is not pedantry. If you believe you must hit EPC B by 2030, you will budget and sequence works to a deadline that does not exist, and you may over-spend on assets that the actual rules do not yet touch.

What is actually proposed now

In its interim response of 18 June 2026, the government set out the live proposal. It is a proposed standard of EPC B by 2031 — and the detail matters as much as the headline:

• It applies only to privately-rented non-domestic buildings over 1,000 m².
• It applies only where reaching the standard is cost-effective.
• It is subject to secondary legislation — it is not in force, and the final form, exemptions and metric can still change.
• It covers England and Wales only.

So the realistic planning position is: a sub-1,000 m² unit is not in scope of the proposed B standard at all; a larger let asset is, but only to the extent improvement is cost-effective, and only once the regulations are actually made.

We unpack the full chronology, the exemptions register and the cost-effectiveness test in the MEES and EPC guide.

The penalties, and the part owners forget

The financial exposure scales with the breach. Let a sub-standard property for under three months and the penalty is up to 10% of the property’s rateable value, capped at £50,000. Let it for three months or more and that rises to up to 20% of rateable value, capped at £150,000.

The part that is easy to overlook is the second sanction: a public breach register. A non-compliance entry is published and visible to tenants, funders, valuers and prospective purchasers. For an investor that markets ESG credentials to occupiers and lenders, a register entry is a reputational and transactional drag that outlasts the fine. Due diligence teams check it.

Why the asset value question is bigger than the fine

The penalty caps are real, but they are not the reason serious owners are acting. The reason is stranding. The British Property Federation reported in October 2025 that around 83% of commercial buildings across seven major UK cities sit below EPC B. CBRE put roughly 58% of Central London offices below B. Savills has flagged around 185 million sq ft of UK retail floorspace at risk on energy grounds.

Read those numbers as a market signal, not a compliance one. A sub-B asset in a market moving toward B-rated leasing is one that lets more slowly, at thinner rents, to a shrinking pool of tenants who can satisfy their own ESG mandates. The green-premium evidence points the other way for the assets that do upgrade: JLL’s analysis of prime Central London offices (BREEAM-rated, 2017–21) associated certification with around +11.6% on rent and +20.6% on capital value, and roughly +4.2% rent and +3.7% capital value per EPC band. Those figures are specific to prime Central London offices and are associations, not guarantees — but the direction is consistent across the studies.

Where solar fits — and where it does not

Solar is a lever on the EPC, not a magic band-jump. A well-specified rooftop array typically lifts a commercial EPC by one to three bands, depending on the building’s starting fabric, its baseline energy intensity and how the EPC assessor models on-site generation. It is never a guaranteed jump to B from a low base, and any supplier promising one is selling you a number they cannot underwrite.

What solar does reliably is two things at once: it moves the EPC in the right direction, and it cuts the building’s exposure to grid electricity at 24–28p per kWh of self-consumed generation. For a let asset the structuring question — who pays for the array and who benefits from the saving — is the whole game, and it is rarely the landlord paying and the tenant benefiting by accident. We cover the five routes through that in the split-incentive guide.

The practical checklist for landlords

Here is the sequence we would run on a portfolio today.

1. Audit every EPC and its expiry. Pull the current rating and the assessment date for each let unit. EPCs lapse after ten years; a strong-looking certificate from 2016 may be close to expiry and modelled on superseded assumptions. Flag anything at F or G — those are unlawful to let now and need immediate attention.

2. Isolate the sub-B lets over 1,000 m². These are the assets in scope of the proposed 2031 standard. Rank them by lease event — break clauses, expiries, rent reviews — because the cheapest time to improve a building is when it is empty or being re-let, not mid-term.

3. Model solar as a one-to-three-band lever on each. Get an EPC-aware assessment of what an array would do to the rating, alongside the energy and self-consumption case. Do not assume the band uplift; have it modelled against the actual building. Our cost page sets out realistic commercial capex by system size so you can sanity-check any proposal.

4. Sequence solar with the re-roof and any fabric works. Never install an array onto a roof with under ten years of life left — you will pay twice. Where a re-roof, re-clad or major refurbishment is already on the capex plan, fold the solar into it. The structural and access savings of doing both together are substantial.

5. Fix the ownership and lease structure before you sign anything. On a let asset, decide up front whether you are using landlord common-parts supply, a landlord-to-tenant PPA, a roof lease, a green-lease clause, or owner-occupier economics. The wrong structure strands the saving with the wrong party and can sour the tenant relationship.

6. Watch the secondary legislation, do not pre-empt it. The 2031 standard is not yet made. Plan for it, scope for it, but do not commit capital to a deadline that the final regulations may move. The cost-effectiveness test, in particular, may change what you are actually required to do.

Where to take it from here

The honest summary is short. EPC E is the law you must meet today. EPC B by 2031 for buildings over 1,000 m² is a credible proposal you should plan for, not a deadline you can yet rely on. And solar is a real but partial lever — one to three bands, structured carefully — inside a wider works and leasing plan.

If you want the band uplift modelled against your actual buildings, with the ownership structure worked out so the right party pays and the right party benefits, request a quote and we will start with the assets where the lease timing and the compliance clock line up.