MEES 2030 and office buildings — the £6 billion question

The £6 billion question hanging over UK office property

By April 2030, the UK government’s proposed tightening of the Minimum Energy Efficiency Standards (MEES) regulations will bar landlords from letting commercial property below EPC B. The headline number that should focus every office portfolio strategy is this: around 21% of the UK’s office stock currently sits below EPC B. At an average upgrade cost of roughly £180 per square metre, the total capex bill to bring the non-compliant fraction up to standard sits around £6 billion.

That number is roughly half the entire UK commercial solar market over the next five years, which is why MEES 2030 has become the single biggest demand driver for commercial PV across the office sector.

The regulation, in plain English

The Minimum Energy Efficiency Standards regulations came into force in April 2018 with a simple rule: landlords could not grant new leases on commercial property rated EPC F or G. In April 2023, the rule extended to all existing commercial lets — including those with sitting tenants — making sub-E lets unlawful regardless of how long the tenant had been in occupation.

The government has consulted on tightening the standard to EPC C minimum from April 2027 and EPC B minimum from April 2030. The 2027 step is widely expected to land as proposed. The 2030 step has slightly more uncertainty — but landlords planning capex programmes are working on the assumption that B by 2030 will become law.

Why solar is the cheapest route from C to B

For an office building rated EPC C, the cheapest practical route to EPC B usually runs through one or more of: LED relighting (typically maxes out a C-rated office at upper-C, struggles to deliver B), HVAC controls and BMS optimisation (similar story), fabric upgrades like insulation or window replacement (cost-prohibitive on most occupied offices), heat pump retrofit (good for EPC but expensive and disruptive), and solar PV.

Solar PV adds 4-12 EPC points depending on the specific building and SAP version. For a typical 5,000-sqm office building running at high EPC C (a 65-70 SAP score), a 300-500 kWp PV system reliably lifts the rating into EPC B (75+ SAP score). The capex cost is typically £250,000-£450,000 — but unlike LED or HVAC upgrades, the PV install also delivers £60,000-£120,000 of annual electricity savings and earns 100% Annual Investment Allowance in year one.

That means the net effective MEES compliance cost on a solar-led route is often negative — the building is more profitable after the upgrade than before, and the EPC compliance is a free by-product.

Where it gets complicated

Three traps catch landlords approaching MEES 2030 planning.

First, the EPC re-rating risk. EPCs issued under SAP versions before 10.2 (introduced 2022) used different methodologies. A building rated ‘B’ in 2018 commonly re-rates to ‘C’ or ‘D’ when the EPC is renewed under SAP 10.2 — particularly on buildings with electric heating, on-site fossil fuel boilers, or older HVAC equipment. Many landlords have building stock they believe is MEES 2030-compliant which won’t be on next renewal.

Second, the cumulative-improvement test. MEES has a “cost-effective measures” requirement: landlords must implement all measures with a payback under 7 years before claiming non-compliance is unavoidable. Solar PV with current grid prices comfortably passes this test on the majority of office buildings — meaning a “we can’t reach B” defence won’t hold against a PV-feasible building.

Third, the tenant cost-recovery question. Solar capex on a multi-let building can usually be recovered via the service charge, but only where the system unambiguously benefits tenants (reduced landlord-areas electricity cost flowing through service-charge apportionment). Direct tenant electricity supply usually requires a sleeve PPA or sub-meter arrangement. Both work; both need careful structuring to avoid challenge under the RICS Code on Service Charges 2018.

What landlords should do now

For office landlords, the planning horizon is short. EPC certificates have 10-year validity, and rolling MEES 2030 into a normal capex cycle requires action in the 2026-2028 window for most portfolios.

Three steps make sense in 2026:

Audit every EPC across the portfolio. Identify buildings rated B that were issued pre-2022 (high re-rating risk) and buildings currently rated C or below.
Commission solar feasibility studies on every flat-roof commercial office above 2,000 sqm. Most will deliver MEES compliance and positive NPV simultaneously.
Structure the capex programme. Decide between cash, asset finance, operating lease, or PPA on a per-asset basis depending on lease length, tenant profile, and balance-sheet preference.

We deliver free desk feasibility studies covering exactly this question. Send us a portfolio list and basic EPC data, and we’ll model the solar route to MEES 2030 across every building. Get in touch here.