MEES for commercial landlords: where the law actually stands

The Minimum Energy Efficiency Standards make it unlawful to let commercial property in England and Wales rated below EPC E. That has applied to new leases since 2018 and to all continuing leases since April 2023. The much-discussed jumps to C and B are proposals — important ones, but not yet law.

The current rule: E is the floor

If your building holds an F or G rating, you cannot grant a new lease or continue an existing letting unless a valid exemption is registered. Enforcement sits with local authorities, who can serve compliance notices, impose financial penalties scaled to rateable value, and publish details of the breach. The lease itself stays valid throughout — the tenant keeps their rights while the landlord absorbs the penalties.

In practice enforcement has been patchy but is sharpening: several London boroughs and the larger metropolitan authorities now run data-matching between the EPC register and rating lists, which surfaces sub-E lettings without anyone visiting the building. A current certificate from an accredited assessor is the basic defensive document — see what one costs.

The proposed trajectory: C by 2027, B by 2030

The government's 2021 consultation proposed lifting the commercial MEES floor to EPC C by 1 April 2027 and EPC B by 1 April 2030, with a compliance-window mechanism in between. As of mid-2026 the consultation response has still not been published, and neither deadline has been legislated. Anyone presenting 2027 as settled law is ahead of the facts.

That said, the proposals are already economically real. Roughly two-thirds of UK commercial floorspace is rated C or worse, lenders price EPC trajectory into refinancing terms, and tenants with science-based targets screen space on ratings. The rational response is not panic refurbishment — it is knowing your current rating accurately, understanding which improvements move it, and sequencing works around lease events. The recommendation report that comes with every commercial EPC is the starting document; pairing it with proper measure-level advice on upgrades, or with a building energy audit for operational detail, turns it into a plan.

Penalties at a glance

Publication of the breach on the PRS Exemptions Register is an additional, non-financial penalty — and increasingly the one institutional landlords care most about.

Exemptions: narrower than they look

Five exemption routes matter for commercial stock: the seven-year payback test, the "all improvements made" route, devaluation (RICS-evidenced 5%+ reduction in value), third-party consent refusals, and the six-month grace period for parties who became landlords suddenly (lease renewals by operation of law, purchases of tenanted stock, and similar). Every exemption must be registered with prescribed evidence before it protects you, lasts at most five years, and dies with a change of ownership.

The most common failure we see: landlords assuming the payback exemption applies without commissioning the three quotes the evidence rules require, or relying on an exemption a previous owner registered. Both leave you exposed. Official guidance is on gov.uk alongside the non-domestic MEES guidance documents.

A sensible 2026 playbook

1. Re-baseline the portfolio. Get current ratings on anything assessed before 2020 or sitting at D/E. Conventions have moved; old certificates mislead in both directions.
2. Triage against lease events. Sub-E stock with imminent lettings is urgent. D and C stock matters at refinancing and rent review, not tonight.
3. Cost the moves that matter. LED lighting, heating controls and hot-water upgrades shift more SBEM points per pound than glazing in most stock. Validate the EPC recommendation report before spending.
4. Paper the exemptions properly where works genuinely fail the payback test — registered, evidenced, diarised for renewal.

If you want the baseline done quickly, the assessment process takes days, not weeks, and portfolio instructions are priced as one job.