MEES compliance for commercial property

The Minimum Energy Efficiency Standard, MEES, is the rule that decides whether you can lawfully let a commercial building. It is short in principle and widely misunderstood in practice, largely because a great deal of the guidance still online describes deadlines that no longer exist.

This page sets out where the non-domestic standard actually stands: what you must hold today, what has been proposed for the future, what was dropped, what the penalties are, and what to do if your building cannot meet the standard. If you own, let or manage commercial premises in England or Wales, this is the compliance picture you are working within.

The standard today: EPC E

The current minimum for a non-domestic property is EPC E. A building rated F or G cannot lawfully be let.

The timing is the part that catches people out. The standard applied to new lettings and lease renewals from 1 April 2018. Since 1 April 2023 it has been unlawful to CONTINUE letting a non-domestic property below E - so an existing tenancy signed years ago is no longer a shelter. A landlord with a sitting tenant in an F-rated building is in breach now, not at the next lease event.

This is the single most common misunderstanding we encounter, and it is an expensive one, because the breach is continuing rather than one-off.

What is proposed next: EPC B by 2031

The government has proposed that privately rented non-domestic buildings over 1,000 sqm should reach EPC B by 2031. That is a proposal. It depends on secondary legislation and is not currently law.

Two details matter enormously and are widely reported wrongly. First, in the government response of 18 June 2026, the interim EPC C milestone for 2027 was dropped - there is no interim EPC C deadline in 2027 to plan around. Second, the proposed standard is aimed at buildings over 1,000 sqm; buildings under that threshold remain on the EPC E standard with no new deadline announced.

If you are reading advice that refers to "EPC C by 2027" or "EPC B by 2030", it is out of date. Capital planned around either of those dates is planned around something that was either dropped or never the proposal. The sensible response for a large privately let building is to understand the gap between its current rating and a B, and to align improvement works with lease events and plant-replacement cycles rather than with a deadline that may move.

The penalties

Non-domestic MEES penalties are tiered on the property's rateable value and escalate with the length of the breach, reaching up to GBP 150,000 for the longest breaches. Publication of the breach sits alongside the financial penalty, and for many businesses that is the sharper consequence.

A separate penalty of GBP 500 to GBP 5,000 applies to failing to have or to produce an EPC when one is required. These are distinct: you can be penalised for not holding a certificate and, separately, for letting below the standard the certificate reveals.

If your building cannot meet the standard: the exemptions register

Where a non-domestic property genuinely cannot be improved to the minimum standard, a valid exemption can be registered on the PRS Exemptions Register. This is a legal shield, not funding and not a loophole. Exemptions must be justified against defined grounds, they are time-limited, and they must be renewed rather than set and forgotten.

Registering an exemption you cannot support is worse than having no exemption at all, because it creates a record. Where the grounds are genuine, however, the register is the correct route and it exists precisely for buildings whose fabric or heritage status makes improvement unreasonable.

We cover the grounds and the process in detail in our guide to commercial MEES exemptions.

What to do about an F or G rating

An F or G rating is not a fine in itself - it is a bar on letting. The routes out are to improve the building to at least E, or to register a valid exemption where improvement genuinely is not possible.

The improvement route is usually less painful than owners expect, because the measures that move a non-domestic rating are mostly services rather than fabric: LED lighting with proper controls, heating controls and zoning, better ventilation control, and replacing ageing or oversized plant. Those are also the measures least likely to require consent, which matters for listed and conservation-area buildings where the envelope cannot be touched.

Our guide to commercial buildings rated F or G works through the options in order of cost.

MEES and the EPC are not the same thing

It is worth separating two ideas that get conflated. The EPC is the certificate: a rating plus a recommendation report, produced by an accredited assessor and lodged on the national register, valid for 10 years. MEES is the regulation that says what rating you need in order to let.

You can need an EPC without MEES being in play - on a sale, for instance, or on construction. And a building can hold a perfectly valid EPC that shows it is not lettable. Getting the certificate is the diagnosis; MEES is what the diagnosis means for your ability to earn income from the building.

The assessment level that produces the certificate matters too. Most buildings are modelled with SBEM at Level 3 or Level 4, and the most complex with Dynamic Simulation Modelling at Level 5. Our explainer on SBEM Level 3, Level 4 and DSM sets out which applies to which building.

A practical compliance sequence

For most owners the order of work is the same. Establish what certificate the building currently holds and when it was lodged, because the 10-year clock runs from lodgement and an old certificate may no longer reflect the building. If there is no valid certificate, or the building has changed materially, commission an assessment.

Read the recommendation report rather than filing it. It is building-specific and it is the cheapest piece of energy consultancy you will ever receive. Where the rating is below E, cost the recommended measures and compare that against the value of being able to let. Where the building is over 1,000 sqm and privately let, look at the gap to a B as well, so that improvement work done now is not work that has to be redone.

Where improvement genuinely is not viable, prepare the evidence for an exemption properly and register it. And diarise the certificate expiry - most compliance failures we see are not decisions, they are things nobody was watching.

Where these rules apply

The regime described on this page applies to commercial premises in England and Wales. If you hold property elsewhere in the UK, confirm the position for that jurisdiction separately rather than assuming it mirrors this one - the arrangements are not identical, and we would rather you checked than took our word for a nation we do not cover here.

The misconceptions worth correcting

Four beliefs cause most of the trouble we see. The first is that an existing tenancy protects a sub-standard building; since 1 April 2023 it does not. The second is that listing automatically exempts a building; it does not, and the position has to be established for the specific property rather than assumed.

The third is that the EPC rates how much energy you actually use. It does not. It rates the building fabric and its fixed services under standardised assumptions, which is why an energy-intensive manufacturer can hold a good certificate while a lightly used period office rates badly - and why "we hardly use the building" is not an argument the methodology can hear.

The fourth is that the deadlines are settled. They are not: the interim EPC C milestone was dropped, the EPC B standard is a proposal subject to secondary legislation, and the sensible planning posture is to close the gap on your worst buildings while keeping capital decisions tied to lease events rather than to dates that may move again.