Minimum Energy Efficiency Standards (MEES) are a key driver in how commercial property is managed, leased, and refurbished across the UK.
While the regulations set out clear minimum energy performance requirements, their impact is most visible in older commercial buildings, particularly offices, where EPC ratings are often below current standards. This is driving a stronger focus on improving existing assets through refurbishment and retrofit, with increasing emphasis on sustainability and long-term performance rather than relying on new development alone.
Willmott Dixon Interiors is an industry-leading fit-out company and refurbishment contractor, helping organisations upgrade existing buildings to meet compliance requirements while improving efficiency, value and occupant experience.
Key Takeaways
- MEES sets the minimum EPC rating required to legally let commercial property in England and Wales.
- A minimum EPC rating of E is required to let most commercial buildings, unless a valid exemption applies.
- F- and G-rated buildings are classed as substandard and cannot be let without improvements or exemptions.
- Refurbishment, retrofit, and commercial fit-out projects are key routes to improving EPC ratings and future-proofing assets against potential regulatory changes.
What are the Minimum Energy Efficiency Standards?
The Minimum Energy Efficiency Standards (MEES) are designed to improve the energy efficiency of buildings across England and Wales, helping to reduce carbon emissions, lower energy consumption and support the UK’s wider net-zero goals.
The regulations are linked to Energy Performance Certificates (EPCs), which rate a building’s energy efficiency on a scale from A to G.
- A: Exceptional energy performance and very low running costs
- B: Highly energy efficient with strong environmental performance
- C: Good energy efficiency and increasingly viewed as a benchmark for future-ready buildings
- D: Average performance, but with opportunities for improvement
- E: The current minimum standard required for most commercial properties
- F: Poor energy performance and generally non-compliant for letting
- G: The lowest rating, indicating significant inefficiencies and high energy consumption
MEES Requirements for Commercial Buildings
Commercial property owners and landlords need to understand both the current legal requirements for letting commercial space and the direction of future MEES changes, as these affect compliance today and refurbishment planning for the future.
Research by Search Acumen found that offices account for 48% of all F- and G-rated non-domestic buildings lodged under MEES in the past five years, highlighting the scale of compliance pressure within the sector.
Current MEES Requirements
A commercial property must currently have an EPC rating of E or above to be legally let (unless exempt).
Properties rated F or G are classed as “substandard” and cannot be let unless a valid exemption is registered.
The timeline below highlights the key changes to MEES:
- 2015: The Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015 established the legal framework for Minimum Energy Efficiency Standards (MEES).
- April 2018: MEES came into force for new commercial leases. Landlords could no longer grant a new lease on a property with an EPC rating below E unless a valid exemption applied.
- April 2023: The regulations were extended to cover existing commercial tenancies. Landlords must now ensure all let commercial properties meet the minimum EPC requirement, regardless of when the lease began, unless a valid exemption is in place.
Future of MEES Standards for Commercial Property
The UK Government has consulted on proposals to tighten MEES requirements for commercial property, although no new minimum EPC thresholds have been introduced into law.
Proposals include:
- A requirement for new commercial leases to achieve a minimum EPC rating of C by 2027.
- A longer-term ambition for all rented commercial buildings to reach EPC B by 2030.
These proposals have not been legislated and remain subject to government decision.
In practice, the prospect of tighter standards is already driving demand for refurbishment and retrofit projects, as landlords and occupiers look to future-proof their assets.
Achieving MEES Compliance Through Refurbishment
For many commercial buildings, particularly older offices, achieving MEES compliance requires targeted refurbishment works that improve energy performance and increase EPC ratings.
A well-planned refurbishment can do more than meet minimum standards. By incorporating a sustainable fit-out, organisations can reduce operational energy use, minimise waste, make more efficient use of materials and support broader sustainability objectives while improving the building’s performance.
Common measures include:
- Improving insulation to roofs, walls, or floors where feasible to reduce heat loss and improve energy efficiency
- Upgrading glazing to improve thermal performance and reduce heating and cooling demand
- Upgrading heating, cooling, and ventilation systems to improve energy efficiency and building performance
- Replacing outdated lighting with energy-efficient LED systems, smart controls, and occupancy sensors
- Installing smarter building controls, such as zoning, timers, and energy management systems, to optimise energy use
- Reconfiguring internal layouts through a sustainable fit-out to optimise space utilisation, support modern workplace requirements, and reduce unnecessary resource consumption
The most effective approach is typically informed by an EPC recommendation report or detailed energy assessment. This helps identify the measures most likely to improve a building’s rating, achieve compliance, and prepare the asset for future changes to energy efficiency standards.
How Willmott Dixon Interiors Supports MEES Compliance
Willmott Dixon Interiors helps customers meet MEES requirements through the refurbishment, retrofit, and fit-out of existing buildings, improving performance while extending the life and usability of commercial assets.
Our low carbon retrofit approach provides you with a suite of energy efficiency measures to help you meet MEES requirements, tailored to your specific needs and requirements. Our award-winning Energy Synergy ™ system is part of this approach. Our double CIBSE award-winning building performance management service provides real-time energy monitoring to help you reduce costs (we saved clients over £460k in the past year), close the performance gap and achieve net-zero. It integrates with your facilities teams and existing systems to meet your specific objectives.
Our teams deliver projects that enhance workplace functionality, modernise internal environments and support more efficient use of space within occupied and operational buildings.
Working in live environments is a key part of our approach. We carefully plan phasing and logistics to minimise disruption while delivering improvements that enhance the performance of older buildings and support compliance with MEES requirements.
For more information on our commercial fit-out and office fit-out services, please contact our team today.