MEES and commercial property: where heating upgrades fit

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Under the Minimum Energy Efficiency Standard (MEES), most privately rented commercial buildings in England and Wales need at least an EPC E rating, unless the landlord has registered a valid exemption. GOV.UK says that since 1 April 2023 this "applies to all privately rented non-domestic properties (even where there has been no change in tenancy)." Heating plant is often one of the improvements that can lift a rating, so a boiler or controls upgrade is worth looking at alongside the EPC's recommendations. This guide explains how heating upgrades fit into MEES, the 7 year payback test, and the proposed move to EPC B for larger buildings from 2031.

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Commercial heating tips and advice · 4 November 2026 · Fast Commercial Boiler Help, Gas Safe 985448

MEES commercial property heating: does the rule apply to your building?

GOV.UK's landlord guidance says the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015 apply to non-domestic rented properties that are legally required to have an EPC. It suggests three questions:

Is the property non-domestic? (The guidance says this "would include most commercial and public sector buildings.")
Is it legally required to have an EPC?
Is the tenancy granted for a 'term certain' between 6 months and 99 years?

If the answer to all three is yes and the EPC is F or G, the landlord "must take appropriate steps to comply". If the property is empty and not being let, the guidance says you don't need to act "until you decide to let it again." This is general information, not legal advice; DESNZ itself says it cannot give a definitive interpretation of the law.

Where heating upgrades fit

The guidance expects landlords to work towards "the highest EPC rating that a cost-effective package of measures can deliver." Heating and hot water plant, and the controls that run it, are part of what an EPC assessor looks at, so they often feature in the recommendations. Typical heating questions to raise with your EPC assessor and engineer are:

Is the existing boiler plant old, oversized or running inefficiently?
Do the controls (time, temperature and zoning, or a BMS) match how the building is actually used? See our BMS and heating controls tips.
Is the system in good condition, with clean, treated water? Poor water quality hurts efficiency; see water treatment for commercial heating.

Only an EPC assessor can say what a change does to the rating. We don't give EPC ratings or predict them; our part is surveying, servicing, repairing and replacing the plant.

The 7 year payback test and exemptions

A recommended measure doesn't have to be installed if it fails the payback test. GOV.UK says a measure, or package of measures, "will fail the 7 year payback test where the expected value of savings on energy bills that the measures are expected to achieve over a period of 7 years, starting with the date the installation is completed, are less than the cost of repaying it." Other exemptions include 'all improvements made', third-party consent and property devaluation.

Exemptions must be registered on the PRS Exemptions Register "before it can be relied on". The 'all improvements made' exemption lasts 5 years, and the guidance warns that registered exemptions "may not pass over to a new owner or landlord" on a sale. Enforcement is by Local Weights and Measures Authorities, who can serve a compliance notice, and a landlord in breach "may receive a financial penalty."

The proposed EPC B standard for larger buildings

On 18 June 2026 the government published an interim response on strengthening non-domestic MEES. It says that "from 2031, it is proposed that all private rented buildings over 1,000 square metres in England and Wales will need to reach a higher standard of energy efficiency of EPC B, where cost effective", that buildings below 1,000 square metres are intended to stay at EPC E, and that the previously proposed EPC C milestone for 2027 "will not be taken forward". The 7 year payback test and exemptions are to remain. These changes "will only take effect following the successful passage of secondary legislation through Parliament", so treat 2031 as a proposal until the law is made. For larger buildings, it is a good reason to build heating plant into longer-term planning now rather than waiting for a breakdown.

Part L when you replace heating plant

Replacing a boiler is building work, and the energy efficiency requirements of Part L of the Building Regulations apply. In England, GOV.UK's Approved Document L page covers Volume 2: Buildings other than dwellings, and it now also lists a 2026 edition for buildings subject to the 2026 standards, with earlier versions continuing to apply to buildings under previous standards. Your installer should confirm which edition applies to your project. Our guides to planning a commercial boiler replacement and ErP rules for commercial boilers cover the survey and product rules in more detail.

ESOS: a separate scheme for large organisations

Large tenants and landlords may also be in the Energy Savings Opportunity Scheme (ESOS). GOV.UK describes it as "a mandatory energy assessment scheme" which includes "an audit of the energy used by their buildings, industrial processes and transport". For phase 4, an organisation qualifies if on 31 December 2026 it meets the large undertaking definition (broadly 250 or more employees, or turnover over £44 million and balance sheet over £38 million), and the compliance deadline is 5 December 2027. An ESOS audit can be a useful source of heating improvement ideas, but it is not the same as an EPC and doesn't change the MEES rating.

Safety stays the same during any upgrade

Energy work doesn't change gas safety duties. Under the Gas Safety (Installation and Use) Regulations 1998, gas plant at a place of work must be maintained in a safe condition by whoever controls it, and all gas work must be done by a Gas Safe registered engineer. Where plant falls under the Pressure Systems Safety Regulations 2000 (HSE's INDG178 lists steam and "pressurised hot water above 110 °C"), the duty holder still needs a written scheme of examination; see PSSR written schemes explained. For who is responsible for what on a let building, see commercial landlord heating responsibilities.

Planning heating upgrades on a let building?

We work with commercial landlords and managing agents on plant surveys, servicing, repairs and replacements. Call 0800 0996 007 or see our landlords and property managers page. All gas work is carried out by Gas Safe registered engineers (985448). See also commercial boiler installation, commercial boiler servicing, planned preventive maintenance and finance options.

Safety note

Under the Gas Safety (Installation and Use) Regulations 1998, gas work must be carried out by a Gas Safe registered engineer, and we apply that rule on every site. Don't attempt DIY work on gas appliances, burners, flues or safety devices. On pressure systems, trained site staff should stick to visual and gauge checks, log the readings and report anything abnormal. Never adjust, cap, plug or test-lift a relief valve yourself.

Talk to a Gas Safe commercial engineer

Fast Commercial Boiler Help is a Gas Safe registered (985448) commercial heating business based at 4 Market Hill, Clare, Sudbury, Suffolk CO10 8NN. Our team of over 10 local engineers covers East Anglia and East London, working on commercial boilers, plant rooms, water heaters, and warm air, radiant and unit heaters. We work on commercial premises only.

Call 0800 0996 007

Call or WhatsApp 07947 578332 (a photo of the appliance data plate or the fault display helps) · Email info@fastcommercialboiler.help

Frequently asked questions

What EPC rating does a commercial rented property need?

Under MEES in England and Wales, privately rented non-domestic properties covered by the regulations generally need at least an EPC E rating, unless the landlord has registered a valid exemption. Since 1 April 2023 this applies to existing lettings as well as new ones.

Can upgrading the heating improve a commercial EPC rating?

Heating and hot water plant and controls are part of what an EPC assessor considers, so upgrades often feature in the recommendations. Only an EPC assessor can say what a specific change does to the rating, so get their advice before committing to work.

What is the MEES 7 year payback test?

GOV.UK says a measure or package of measures fails the test where the expected energy bill savings over 7 years from installation are less than the cost of repaying it. If a recommended measure fails, the landlord can register a 7 year payback exemption on the PRS Exemptions Register.

Will commercial properties need EPC B by 2030?

Not as previously proposed. The government's interim response of 18 June 2026 says that from 2031 it is proposed that private rented buildings over 1,000 square metres in England and Wales will need EPC B where cost effective, smaller buildings are intended to stay at EPC E, and the EPC C milestone for 2027 will not go ahead. It needs secondary legislation before it takes effect.

Do building regulations apply when replacing a commercial boiler?

Yes. Replacing a boiler is building work and the energy efficiency requirements of Part L apply. In England, Approved Document L Volume 2 covers buildings other than dwellings, and your installer should confirm which edition applies to your project.

Sources and further reading