EPC B by 2031: What the New Commercial MEES Standard Means

On 18 June 2026 the government confirmed that, subject to secondary legislation, privately rented non-domestic buildings over 1,000 square metres in England and Wales are proposed to reach EPC B by 2031, where cost-effective. The previously floated interim EPC C milestone for 2027 has been dropped. Buildings under 1,000 square metres stay on the current EPC E minimum, with no new deadline set. If you own or manage a larger commercial building, that single sentence changes how you should plan the next five years.

Much of what you will read elsewhere on this is out of date. Content citing “EPC B by 2030” or a firm 2027 EPC C deadline predates the June 2026 position and should be treated with caution. This guide sets out the current, verified standard, who it actually applies to, and what a current C or D rating means for a large building today.

What actually changed on 18 June 2026

The commercial MEES trajectory had, for years, been discussed as a two-step climb: an interim EPC C around 2027, then EPC B around 2030. The government’s interim response changed the shape of that.

• The final standard is EPC B, targeted for 2031, not 2030.
• The standard applies to privately rented non-domestic buildings over 1,000 square metres in England and Wales, where the improvements are cost-effective.
• The interim EPC C milestone for 2027 has been dropped and will not be taken forward.
• Buildings under 1,000 square metres remain subject to the current EPC E minimum, with existing flexibility mechanisms and exemptions unchanged.
• The uplift only takes legal effect once secondary legislation passes through Parliament, so it is a firm policy direction rather than settled law today.

The full detail is set out in the government interim response on EPC B by 2031{rel=“noopener”}, which is the source to trust over any secondary commentary.

Does it apply to my building? A quick test

Three conditions have to be true together for the proposed EPC B standard to catch your building. If any one is missing, you are not in scope of the 2031 uplift, though you are almost certainly still bound by the current EPC E minimum.

Question	In scope of EPC B 2031?
Is the building privately rented (let, not just owner-occupied)?	Must be yes
Is it non-domestic (commercial, not a dwelling)?	Must be yes
Is it over 1,000 square metres of floor area?	Must be yes
All three true	In scope: plan for EPC B
Over 1,000 sqm but owner-occupied	Not in scope of 2031, but you need a valid EPC to sell or let
Let but under 1,000 sqm	Not in scope of 2031: EPC E remains your standard

The floor-area threshold is where most owners misjudge their position. A single large office floor, a distribution warehouse, a sizeable hotel or a care home can each clear 1,000 square metres comfortably. If you are near the line, an accredited assessment establishes both your rating and your floor area on the same survey.

Why a current C or D is a planning issue, not a pass

Here is the point competitors miss. Under the current rules, an EPC C or D on a large building is perfectly lawful to let, because the present minimum is E. It is easy to read that as “compliant, nothing to do”. For a building over 1,000 square metres that is privately let, it is not.

EPC B is a demanding band. Very few existing commercial buildings sit at B without deliberate investment. Moving a large warm-shell warehouse or a gas-heated office from a comfortable C up to a B typically means a package of measures, roof and fabric insulation, LED lighting with controls, heating and hot-water upgrades, better building management, and often low-carbon heating or on-site generation. Those are capital projects with lead times, not a weekend of works. Five years is not long when the works have to fit around lease events, tenant access and your own capital cycle.

Treating the assessment as a capital-planning tool rather than a last-minute compliance scramble is the difference between improving on your own timetable and being forced into rushed, expensive works, or an unlettable asset, close to the deadline.

What EPC E still means right now

None of this removes today’s obligations. The current minimum to let non-domestic property is EPC E, and it applies to buildings of every size, including those under the 1,000 sqm threshold.

Since 1 April 2023 it has been unlawful not only to grant a new sub-E lease but to continue letting a sub-E building. A poor certificate on a currently-tenanted property is therefore a live compliance risk today, entirely independent of the 2031 proposal. Breaching MEES by letting below E without a registered exemption carries penalties tiered on rateable value and the length of the breach, up to a maximum of £150,000, per the non-domestic MEES landlord guidance{rel=“noopener”}, and non-compliant landlords can be named publicly. Our full breakdown of the current standard sits in our commercial MEES FAQs.

What to do now if you own a large building

The sensible sequence is straightforward, and it starts with knowing your number.

1. Get a current, accredited assessment. You cannot plan against a rating you do not have, or one that expired years ago. A Level 4 SBEM (or Level 5 DSM for the most complex buildings) survey gives you both the band and the floor area.
2. Read the recommendations as a roadmap. The EPC report ranks improvement measures by impact. For a large building targeting EPC B, that list is the outline of your capital plan.
3. Cost the route to B, and phase it. Some measures qualify for support, the Boiler Upgrade Scheme{rel=“noopener”} can help fund low-carbon heating where an EPC recommends it, though the certificate itself is never grant-funded. See our grants and funding routes for what applies.
4. Align the works with your lease cycle. Phasing improvements around tenant changes and planned refurbishment is far cheaper than a standalone compliance project.

Common questions

Is the deadline EPC B by 2030 or 2031?

2031, and it is a proposal pending secondary legislation, not yet law. The 2030 date and the firm 2027 EPC C milestone both predate the government’s 18 June 2026 interim response, which set the final standard at EPC B by 2031 for over-1,000 sqm privately let buildings and dropped the interim EPC C step entirely. Any source still quoting 2030 or a 2027 C deadline is stale.

My warehouse is 1,400 sqm and rated D. Am I breaking the law?

No, not today. EPC D is above the current EPC E minimum, so the building is lawfully lettable now. But because it is over 1,000 sqm and privately let, it is in scope of the proposed EPC B by 2031 standard, so a D is a future compliance liability to plan for, not a pass. The time to cost the route from D to B is now, while you have years rather than months.

Plan your route to EPC B

If you hold a large commercial building, the first move is knowing exactly where it sits today and what the climb to B involves. An accredited Non-Domestic Energy Assessor can survey the building, confirm whether it is over the 1,000 sqm threshold, and hand you a ranked improvement roadmap. To get a firm quote for a Level 4 or DSM assessment on your building, request a free commercial EPC quote and we will assess to the rule that actually applies to it.