MEES (Minimum Energy Efficiency Standards)

What is MEES (Minimum Energy Efficiency Standards)?

The Minimum Energy Efficiency Standards (MEES) were introduced under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015, implementing requirements of the Energy Act 2011. They set a floor for the energy efficiency of rented properties, using the Energy Performance Certificate (EPC) rating system.

Since 1 April 2018, landlords in England and Wales have been prohibited from granting new leases for commercial or domestic properties with an EPC rating below E. Since 1 April 2023, this prohibition extends to all existing commercial leases — meaning landlords cannot continue to let a commercial property with an EPC below E, even if the lease was granted before 2018. The same restriction for existing domestic leases has been in place since 1 April 2020.

EPC ratings run from A (most efficient) to G (least efficient). A rating of E is a relatively low bar — it corresponds to buildings with basic insulation, older heating systems, and limited efficiency measures. The UK government has consulted on raising the minimum to C for commercial properties by 2027 and B by 2030, though the timeline for implementation has been subject to delays and policy changes. For domestic properties, proposals to require a minimum C rating for new tenancies have also been discussed.

MEES has significant implications for commercial landlords and investors. Properties with EPC ratings of F or G are "stranded assets" — they cannot be legally let until the rating is improved. This drives investment in energy efficiency measures: insulation, window upgrades, LED lighting, boiler replacements, heat pumps, building management system improvements, and renewable energy installations. The costs can be substantial, but the regulations include exemption provisions where improvements are not cost-effective (broadly defined as measures with a 7-year payback period for commercial properties).

Non-compliance carries financial penalties. For commercial properties, penalties can reach up to £150,000 per property (based on rateable value and duration of non-compliance). For domestic properties, penalties are lower but still significant. The enforcing authority is the local weights and measures authority (trading standards).

MEES is increasingly connected to carbon accounting through two pathways: first, improving building energy efficiency directly reduces Scope 1 and 2 emissions; second, investors and landlords are using carbon metrics alongside EPC ratings to assess portfolio climate risk and prioritise retrofit investment.

How Climatise Helps

Climatise's site-level energy and emissions analysis helps landlords and property managers identify which buildings have the highest energy intensity and carbon emissions — prioritising retrofit investment for MEES compliance and beyond. The platform tracks energy performance improvements over time to demonstrate progress.

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