Commercial landlords have spent three years bracing for a EPC B deadline that has just moved. On 18 June 2026 the Department for Energy Security and Net Zero published its interim response to the long-running Minimum Energy Efficiency Standards (MEES) consultations — and the headline is a reset, not a retreat. The direction of travel for non-domestic property is unchanged: get energy performance up or lose the right to let. But the timetable, and who it actually applies to, has shifted enough that every landlord, agent and asset manager needs to re-read their compliance plan.
This matters for the trade because MEES is one of the few regulatory triggers that reliably converts into installed kWp. A landlord facing a legal letting ban responds differently to one being asked to “consider sustainability.” Understanding exactly where the line now sits — and where solar fits against the alternative measures — is the difference between a wasted sales call and a qualified lead.
Where MEES actually stands today
The current legal floor has not changed: since 1 April 2023, a landlord cannot grant a new lease, renew a lease, or continue letting an existing non-domestic property (with narrow exceptions) if its EPC rating is F or G. The property must be E or above. That rule is live now, has been for three years, and non-compliance carries civil penalties of up to £150,000 depending on rateable value and duration of breach — so it is not a theoretical risk.
What has changed is the next rung up the ladder. The original 2021 consultation proposed EPC C by April 2027 as an interim step, then EPC B by April 2030 as the end state, for the whole non-domestic rented stock. Landlords, surveyors and lenders have been underwriting deals against that 2027/2030 pairing for years.
The June 2026 interim response drops the 2027 EPC C milestone entirely and pushes the B target out by a year — but only for a defined slice of the market:
| Building size | Current requirement | New requirement | Effective from |
|---|---|---|---|
| Under 1,000 sqm | EPC E | EPC E (unchanged, no new deadline set) | Now |
| 1,000 sqm and above | EPC E | EPC B, where cost-effective | 2031 (subject to legislation) |
The interim EPC C milestone for 2027 is gone. The 2030 EPC B deadline is now 2031, and it only bites on buildings above the 1,000 sqm threshold. Smaller retail units, offices and industrial sheds — the bulk of the UK’s commercial stock by number of buildings — stay on the EPC E floor with no confirmed date for anything tighter. None of this is law yet; it needs secondary legislation, which government has said it wants to bring forward “at the earliest opportunity,” but landlords should plan on the direction, not the exact date, being what’s reliable here.
For a fuller breakdown of what qualifies as a rated E-and-above certificate, how assessors calculate the score, and which exemptions still apply (listed buildings, six-month lets, third-party consent refusals), landlordepccompliance.co.uk is worth bookmarking as a standing reference — it’s tracking the legislation as it moves through Parliament rather than freezing the 2021 proposals in place.
Why the reset doesn’t change the sales pitch much
It’s tempting to read “deadline pushed back a year, threshold narrowed” as a signal to slow down outreach to landlord clients. That would be a mistake, for three reasons specific to how EPCs actually work.
First, the seven-year payback test and existing exemption regime survive the reset untouched. A landlord can only lawfully claim an exemption if the required improvements don’t pay back within seven years, or genuinely can’t be made (planning refusal, tenant consent refusal, property value impact over 5%). Solar PV is one of the very few measures that reliably clears that bar on commercial roofs — a 50kWp array at current commercial installed costs of roughly £900–£1,200/kWp typically pays back well inside seven years against a 25p/kWh-ish import tariff and daytime commercial load profiles, especially once export income is added. That means solar isn’t just a rating booster, it’s one of the measures landlords can point to when an assessor or lender asks what they actually did before claiming an exemption elsewhere.
Second, EPC B for buildings under 1,000 sqm was never actually confirmed — it was always the less certain half of the 2021 proposal — so nothing has really been “lost” for smaller-portfolio landlords who were planning ahead of E anyway. Landlords managing multi-let parades, small industrial units or single office buildings under the threshold who already started improvement works don’t need to unwind anything; they’re simply not under a statutory clock for B, which for many will free up budget to fix the worst-performing assets in a portfolio first rather than spreading spend thin across everything.
Third — and this is the one worth leading with commercially — lenders, institutional investors and larger tenants are moving faster than the legislation. ESG-linked commercial mortgages, green lease clauses and corporate net-zero procurement commitments are increasingly asking for EPC B or better regardless of what MEES itself legally requires by what date. A landlord letting to a national retailer or a corporate occupier with its own 2030 science-based target is often under commercial pressure to hit B years before any statutory deadline forces it. The regulation sets the floor; the market is setting the ceiling higher, faster.
How solar actually moves an EPC rating
This is the bit worth getting precise with clients, because EPC methodology surprises people. A commercial EPC (produced under the Non-Domestic Energy Performance Certificate methodology, usually via SBEM software) doesn’t score a building on its electricity bill — it scores modelled CO2 emissions and primary energy use against a notional reference building of the same size and use class. Solar PV reduces the emissions and primary energy figures that feed that calculation, but it is rarely enough on its own to jump two or three whole bands (say F to C) unless it’s paired with fabric or heating-system improvements.
Where PV earns its place is as the highest-yielding single line item once the basics are in — LED lighting, controls, and reasonable insulation. On a typical F/G-rated industrial unit or warehouse, a landlord who has already dealt with lighting and heating controls will often find rooftop solar is the measure that tips the building from D into C or C into B, because commercial roofs on that building type are large relative to floor area, meaning generation capacity per square metre of treated floor area — the number that matters to the calculation — is unusually high. That’s a materially different story to, say, a multi-storey office with a small roof footprint relative to its floor area, where PV alone will barely move the needle and fabric/heating measures have to do more of the work.
For landlords who genuinely don’t know where their buildings sit or what mix of measures gets them from E to B most cost-effectively, an independent EPC assessment is the sensible first step before committing capital to any single measure — commercialepcassessors.co.uk covers exactly that ground: what actually drives the rating on a given building type, and which improvements are wasted spend versus which move the certificate. Getting that sequencing wrong — installing solar on a building where the roof-to-floor ratio means it barely helps, while ignoring a heating system that would have moved two bands — is a common and avoidable error on commercial retrofit projects.
The landlord conversation to have now
For installers and agents talking to commercial landlords in the second half of 2026, the practical script is:
- Under 1,000 sqm and currently E or above: no new statutory deadline, but check any green lease clauses, ESG mortgage covenants or major-tenant requirements independently of MEES — those may already be asking for more than the law does.
- Over 1,000 sqm: 2031 for EPC B is coming, subject to the legislation actually passing, and the seven-year payback test means solar needs modelling now against current energy costs, not against a future price landlords hope for. Waiting until 2029 to start is a mistake — decent installers, roof surveys and DNO grid connection applications all have lead times, and the properties needing the most work will take longest to fix.
- Anyone currently at F or G: this is not a “wait and see” conversation. That’s the enforceable rule today, with penalties attached, unaffected by anything in the June 2026 reset.
The wider commercial property angle — how landlords budget improvement works across a portfolio, and how solar income can offset the capital cost rather than sitting purely as a compliance line item — is covered in more depth on solarpanelsforcommercialproperty.co.uk, which is built specifically around the landlord/owner decision rather than the occupier one; that distinction (who pays, who benefits from export income, who’s driving the improvement) matters more on commercial roofs than most retrofit conversations acknowledge.
Where this shows up regionally
Landlords and agents dealing with mixed commercial portfolios in South Yorkshire have found MEES compliance and roof surveys handled together through Electrifusion Solutions in Doncaster, who work across both the domestic and small-commercial end of the market. In Essex and East Anglia, commercial-specific system design and the larger-building end of this conversation sits with EC Eco Energy, whose work skews toward exactly the 1,000 sqm-plus stock now facing the 2031 deadline. Both are worth involving early rather than after a lease renewal forces the issue.
The bottom line
The June 2026 interim response is a genuine reset, not a rounding error: the 2027 EPC C milestone is gone, the EPC B deadline has moved from 2030 to 2031, and it now applies only to buildings above 1,000 sqm — smaller stock stays on the E floor indefinitely under current proposals. None of that is final until secondary legislation passes. What hasn’t changed is the F/G letting ban, which is enforceable today, or the seven-year payback logic that already makes solar one of the more defensible line items on a commercial improvement plan. For the trade, the sales conversation should follow the building size and current rating, not the newspaper headline — and for landlords with buildings over 1,000 sqm, 2031 is close enough that survey and finance conversations should be starting now, not in 2029. For background on how commercial solar economics compare against other capital works when budgeting an EPC improvement programme, our own breakdown at thecostofsolar.co.uk’s commercial cost page sets out current per-kWp pricing landlords can model paybacks against.