Donna Rourke explores the Government’s latest response to the non-domestic MEES consultation and what it means for landlords, occupiers, investors and lenders across the UK commercial property market. After years of uncertainty, the proposed reforms provide greater clarity on future compliance requirements and the direction of travel for energy performance standards.

For more than five years, the UK commercial real estate sector has faced uncertainty regarding Minimum Energy Efficiency Standards (MEES), with little clarity on when, or if, the long-mooted transitions to EPC ‘C’ and ‘B’ would become law.  

That uncertainty has now been reduced, with the Department for Energy Security and Net Zero (DESNZ) publishing its interim response to the non-domestic MEES consultations.  

Key takeaways

• The government is abandoning the blanket approach across all commercial properties and introducing a targeted, two-tier system that focuses regulations heavily on larger assets while giving smaller properties a reprieve.
• By 2031, all privately rented non-domestic buildings over 1,000 square metres in England and Wales must achieve a minimum EPC rating of B, provided the upgrades are cost-effective.
• Buildings under 1,000 square metres will remain subject only to the current minimum standard of EPC E. There is currently no set deadline or commitment from the government to force these smaller assets past this threshold.
• The previously proposed interim milestone requiring all commercial buildings to reach an EPC C by 2027 has been officially dropped.
• The existing flexibility mechanisms, including the crucial seven-year payback test and standard exemption registries, will remain in place to protect landlords from economically unviable retrofits. 

What this means for commercial landlords

For landlords and asset managers, this announcement provides the policy certainty required to unlock frozen capital expenditure, but it drastically splits portfolio strategies:

Larger assets (over 1,000 sq m) now have a firm, five-year countdown to compliance. With data from the British Property Federation suggesting that up to 81% of commercial buildings in major UK cities currently sit below an EPC B, institutional landlords face a major capital expenditure mobilisation phase.

Conversely, secondary regional assets and high-street retail units under the 1,000 sq m threshold face significantly lower regulatory pressure. While this protects immediate valuations for SME-focused landlords, there may still be a widening green premium vs. brown discount gap driven by market demand rather than legislation.  

Actions for landlords to take

1. Audit the thresholds: Immediately segment your portfolio by floor area to identify assets crossing the 1,000 sq m line.  

2. Model retrofit feasibility: For large assets below a 'B' rating, align energy audits with upcoming lease events to phase intrusive fabric or HVAC upgrades efficiently.  

3. Review green lease clauses: Ensure new leases clearly define data-sharing and cost-sharing boundaries for energy efficiency works, especially given that the 7-year payback framework remains a core metric.

What this means for occupiers

For corporate occupiers, the interim response brings a mix of financial reassurance and shifting lease dynamics.

The Government projects that forcing larger buildings to reach EPC B will save tenants in those spaces up to £360 million annually in energy bills by 2031. In an era of volatile energy markets, occupying an efficient building is no longer just a corporate social responsibility (CSR) goal; it is a core operational cost-mitigation strategy.  

However, tenants in larger spaces should prepare for landlords seeking to initiate retrofits. Corporate occupiers will need to closely scrutinise service charge provisions and landlord access rights to ensure that MEES-driven disruption is managed without damaging business continuity. 

Meanwhile, sustainability-conscious tenants seeking smaller spaces may find the market lacks upgraded stock, as smaller landlords face no legal pressure to improve beyond an EPC E.  

The valuation impact – green premium vs brown discount

From an asset valuation perspective, this two-tier system legally codifies a structural split in the UK commercial property market. Valuers, institutional buyers and real estate investment trusts (REITs) are no longer guessing; they can now explicitly price MEES compliance risk into their discounted cash flow (DCF) models.  

For properties over 1,000 square metres currently sitting at an EPC C or D, capital expenditure allowances for retrofits must be deducted from current valuations. Properties already achieving an EPC A or B will enjoy a yield compression advantage, as they represent "plug-and-play" institutional stock with insulated income streams.

Conversely, while assets under 1,000 square metres are legally protected from upgrading past an EPC E, they are not immune to market forces. Corporate occupiers with science-based net-zero targets will simply refuse to sign leases on inefficient space, regardless of its size. Therefore, these smaller assets could face a market-driven brown discount, regardless of legislation.

Quantifying stranded asset risk

Stranding risk has shifted from a theoretical carbon accounting metric to an imminent balance sheet liability.

If an asset over 1,000 square metres does not hit EPC B by 2031, it becomes legally unlettable. It cannot be newly demised, and existing leases cannot be renewed. Failure to comply could significantly impact an asset’s ability to generate income and may affect liquidity and refinancing prospects as the 2031 deadline approaches.

Crucially, the risk extends beyond equity to debt markets. High-street lenders and commercial banks are increasingly looking at energy performance as a proxy for obsolescence and credit risk. A property facing a heavy capital expenditure requirement to hit EPC B will face significantly tighter refinancing terms, higher interest margins, or outright refusal to lend as the 2031 deadline approaches.  

Furthermore, current legal analysis suggests that the 1,000 square metre threshold applies to the entire building structure, not individual demised units. This means a single sub-500 square metre retail unit or office suite situated within a larger institutional building will still be bound by the 2031 EPC B mandate. Portfolio audits must look at building envelopes, not just individual lease sizes.

Strategic steps to mitigate stranding risk

For landlords, this announcement provides the policy certainty required to unlock frozen capital expenditure, but requires immediate triage:

1. Portfolio triage by scale: Immediately segment your portfolio by gross internal area to isolate assets crossing the 1,000 sq m threshold.

2. Price-in the upgrade capital expenditure: For large assets below a 'B' rating, calculate the specific cost to reach compliance and align these interventions with natural lease events or lifecycle plant replacements to minimise void periods.

3. Audit the debt portfolio: Engage with lenders early regarding lower-rated assets. Demonstrate a fully costed MEES transition pathway to secure favourable refinancing terms before compliance status impacts loan-to-value (LTV) covenants. 

Looking ahead

While the reforms provide greater clarity for the market, they also reinforce the growing importance of energy performance in investment decisions, occupier demand and access to finance. For landlords, occupiers and investors alike, the focus now shifts from regulatory uncertainty to strategic preparation.

If you would like to discuss the implications of the latest MEES proposals for your portfolio, investment strategy or occupational requirements, please contact our specialist teams.

Further information

The Government’s interim response can be viewed here: Minimum Energy Efficiency Standards (MEES) in the non‑domestic Private Rented Sector: interim response - GOV.UK