How Solar Panels Help Meet MEES EPC Requirements

Current MEES Requirements

The Minimum Energy Efficiency Standards (MEES) were introduced under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015. These regulations set a minimum Energy Performance Certificate (EPC) rating that commercial properties must achieve in order to be legally let to tenants.

Since 1 April 2023, the MEES requirements apply to all commercial tenancies in England and Wales, including existing leases that were already in place. The current minimum is an EPC rating of E, meaning properties rated F or G cannot be legally let unless a valid exemption has been registered on the PRS Exemptions Register.

The penalties for non-compliance are significant. Local weights and measures authorities can impose fines of up to 10% of the property's rateable value for breaches of less than 3 months, and up to 20% for longer breaches, subject to a maximum penalty of £150,000 per property per breach. Beyond the financial penalties, non-compliant properties cannot be legally let, rendering them effectively unlettable and significantly reducing their market value.

There are limited exemptions available, including the seven-year payback test (where the cost of improvements exceeds the energy savings over seven years), consent exemption (where a third party whose consent is required refuses), and devaluation exemption (where improvements would reduce the property value by more than 5%). However, exemptions must be registered, last only five years, and are being progressively tightened. Relying on exemptions is not a long-term strategy, particularly given the direction of future regulations.

Future Trajectory: The Road to EPC B

The UK government has made clear its intention to progressively tighten MEES requirements for commercial properties as part of its net zero strategy. The trajectory currently under discussion involves two key milestones.

While the exact dates and transition arrangements are still subject to legislative confirmation, the direction is unmistakable. The jump from EPC E to EPC B is substantial, and for many commercial properties, particularly older buildings with poor fabric efficiency, achieving EPC B will require significant investment in energy efficiency measures and on-site generation.

Forward-thinking landlords are already planning for these changes. Investing in solar panels now serves a dual purpose: it provides an immediate financial return through energy savings and tax benefits, while simultaneously future-proofing the property against tighter MEES requirements. Waiting until the regulations are enacted risks a rush to comply, with potentially higher costs, longer lead times, and installer capacity constraints.

Properties that achieve high EPC ratings ahead of regulatory requirements also benefit from a green premium in the commercial property market. Research consistently shows that properties with better energy ratings command higher rents, lower vacancy rates, and stronger capital values compared to less efficient counterparts.

How Solar Panels Improve Your EPC

An Energy Performance Certificate assesses the energy efficiency of a building based on its construction, insulation, heating systems, lighting, and on-site energy generation. The EPC uses a Standard Assessment Procedure (SAP for residential, SBEM for commercial) to model the building's energy performance and assign a rating from A (most efficient) to G (least efficient).

Solar panels improve the EPC rating by providing on-site renewable energy generation that offsets the building's grid electricity consumption. In the SBEM (Simplified Building Energy Model) calculation used for commercial EPCs, the electricity generated by solar panels is subtracted from the building's total energy demand, reducing the carbon emissions figure that determines the EPC rating.

The improvement from solar panels depends on several factors within the SBEM calculation:

• System size relative to building floor area: A larger system relative to the building provides a greater improvement. A 100kW system on a small building will improve the EPC more than the same system on a very large building.
• Existing building efficiency: Buildings that already have efficient heating, insulation, and lighting see a proportionally larger improvement from solar, as the solar generation represents a bigger percentage reduction in remaining emissions.
• Building energy use profile: Buildings with high electricity consumption relative to heating demand benefit more from solar, as solar directly offsets electricity use.
• Panel orientation and shading: The SBEM model accounts for the actual orientation, tilt, and shading of the solar panels, so a well-optimised installation achieves a better EPC improvement than a sub-optimally oriented one.

It is important to note that installing solar panels alone may not be sufficient to achieve the highest EPC ratings if the building has fundamental efficiency issues. A holistic approach combining fabric improvements, efficient heating, LED lighting, and solar generation delivers the best results. However, solar panels typically deliver the single largest improvement of any individual measure and are one of the few improvements that generate a positive financial return.

Typical EPC Improvements from Solar

Based on our experience across a wide range of commercial properties in Essex and the South East, the following illustrates the typical EPC improvement achieved by solar panel installations.

These are indicative examples based on typical properties. Actual EPC improvements depend on the specific building characteristics, existing energy efficiency measures, and system design. A formal EPC assessment is required to determine the exact impact for your property.

As the table demonstrates, solar panels can achieve dramatic EPC improvements, particularly on buildings with large roof areas relative to their floor area such as warehouses and industrial units. These property types benefit doubly from solar: they have ample roof space for large systems and their relatively simple construction means the solar generation has a proportionally large impact on the building's overall energy performance assessment.

Landlord Obligations

As a commercial landlord, your obligations under MEES are clear and increasingly onerous. Understanding these obligations is essential for protecting both the value and lettability of your property portfolio.

Current Obligations

You must not let a commercial property with an EPC rating below E unless a valid exemption is registered. This applies to all new leases, lease renewals, and existing tenancies. Before marketing a property for letting, you should check the current EPC rating and commission a new assessment if the existing EPC has expired (EPCs are valid for 10 years) or if improvements have been made since the last assessment.

Planning for Future Requirements

Prudent landlords are already planning for the expected increase to EPC B by 2030. Given that commercial solar installations typically take 3-6 months from initial enquiry to commissioning, and the G99 grid connection process adds further time for larger systems, early planning is essential. Consider commissioning an energy audit of your portfolio to identify which properties are at risk and what improvements are needed. Solar panels should be a central part of your improvement strategy, as they deliver both regulatory compliance and financial returns.

Multi-Property Portfolios

Landlords with multiple commercial properties face the challenge of prioritising investments across their portfolio. We recommend starting with properties that have the lowest current EPC ratings and the highest rental values, as these face the greatest risk and offer the highest return on improvement investment. Properties with large roof areas and high electricity consumption are ideal candidates for solar, as detailed in our cost guide and ROI calculator.

For landlords who prefer not to invest capital directly, a Power Purchase Agreement allows solar to be installed with zero upfront cost while still improving the property's EPC rating. The tenant benefits from cheaper electricity, and the landlord benefits from a more compliant, more lettable property.

Benefits for Tenants

While MEES compliance is the landlord's obligation, tenants also benefit significantly from solar-improved commercial properties.

For tenants in buildings where the landlord has not yet invested in energy improvements, proactively discussing solar with your landlord can be mutually beneficial. Demonstrate the financial case using our ROI calculator and highlight how a PPA arrangement could deliver benefits to both parties with no capital outlay from either side.

Whether you are a landlord looking to future-proof your property portfolio or a tenant seeking lower energy costs, our team can help you develop the right solar strategy for your situation. Contact us for a free consultation and site assessment.