Do Solar Panels Improve Your EPC Rating?

Do solar panels improve your EPC rating?

Solar panels generally improve a home's EPC rating, because the Energy Performance Certificate scores a property partly on its estimated energy costs, and on-site solar generation lowers those costs. The size of the improvement depends on your starting point and the system you fit. A larger array on a less efficient home tends to produce a bigger jump, sometimes a whole band, while a smaller system on an already efficient home moves the needle less. EPC ratings run from A (most efficient) to G (least), scored out of 100 points, and solar typically adds several points. It will not, on its own, turn an F into an A, but combined with insulation and efficient heating it can make a meaningful difference to both the band and the running costs the certificate reflects.

Why solar helps the EPC score

An EPC is calculated from a standard assessment of how much energy a home needs and what that energy costs, normalised for a typical occupancy. Because the model assumes solar reduces the electricity you buy from the grid, it credits the property with lower energy costs and a better score. The assessor records the system size and orientation, so a well-sized, well-positioned array earns more credit than a token one. Note that the EPC model uses standard assumptions rather than your actual bills, so the rating reflects the home's potential efficiency, not your personal habits. This is why solar reliably nudges the rating up: the calculation rewards the generation capacity you have installed, regardless of how you happen to use it.

EPC, property value and saleability

A better EPC rating can support a home's value and appeal, although the effect is hard to isolate from everything else that drives price. Buyers increasingly notice running costs and efficiency, and an A to C rated home with solar is an easier sell than a draughty equivalent. For landlords, EPC ratings carry regulatory weight, with minimum standards for rented property, so improving the rating protects lettability. The clearest, most certain benefit remains the lower bills and export income the panels deliver while you live there. Treat any uplift in value or saleability as a welcome secondary benefit rather than the main reason to install, and be wary of anyone who promises a precise figure for how much solar adds to a home's price.

The Future Homes Standard and what it signals

From 24 March 2027, the Future Homes Standard requires solar PV on virtually all new homes built in England, with each new dwelling needing solar capacity equivalent to a set share of its ground-floor area. The standard, part of the 2026 update to building regulations, was shaped in part by Cheltenham MP Max Wilkinson's Sunshine Bill campaign. While the rule applies to new builds rather than existing homes, it tells you which way policy and the market are heading: solar is becoming a baseline expectation for an efficient home, not an exotic add-on. For owners of existing Gloucestershire homes, fitting solar now aligns your property with that direction of travel and improves your EPC ahead of any future tightening of standards.

A worked example of EPC points solar can add

The exact EPC uplift from solar depends on your home's starting score, its size, and the system you install, but a worked example helps illustrate the scale. Consider a typical three-bedroom semi-detached home in Cheltenham rated EPC D with a score of 58 points. Adding a 4kW solar PV system on a south-facing roof might add approximately 8 to 14 points to the energy efficiency score, potentially lifting the home to a low C rating in the 66 to 72 range. A larger 6kW system on a detached property could add more. The SAP calculation credits solar based on the estimated annual generation relative to the home's energy demand, so homes with higher electricity demand and larger arrays see the biggest absolute point gains. These are illustrative figures; the actual uplift is calculated during a formal EPC assessment by a qualified domestic energy assessor.

EPC and the rental minimum standard for landlords

For landlords in Gloucestershire, the EPC rating carries regulatory weight through the Minimum Energy Efficiency Standards (MEES). Since April 2020, it has been unlawful to continue letting a domestic property rated EPC F or G unless a valid exemption is registered. The government has previously consulted on raising the minimum to EPC C for new tenancies, though the timeline for this has been pushed back several times. Regardless of when a stricter threshold takes effect, improving your rental property's EPC now protects against future regulatory changes and makes the property more attractive to tenants concerned about energy bills. Solar PV is one of the measures that can lift a property's rating meaningfully, and because it generates income through the SEG, it is one of the few energy improvements that actively pays the landlord back rather than being a pure compliance cost. Landlord installations also qualify for 0% VAT until March 2027.

Whether batteries affect the EPC

Battery storage does not currently improve your EPC rating in the way that solar panels do. The Standard Assessment Procedure (SAP) used to calculate EPC scores does not credit battery storage with any energy efficiency points, because the model assesses the building fabric and fixed generation capacity rather than how electricity is stored or time-shifted. This means adding a battery to your solar system will improve your real-world bill savings and self-consumption, but will not change the number on your EPC certificate. The distinction matters if your primary motivation is improving the EPC band, for example to meet landlord MEES requirements or to hit a green mortgage threshold. In that case, the panels themselves do the work on the EPC, while the battery does the work on your actual energy bills. Both are valuable, but for different reasons.

Getting the most EPC benefit

• Size the system to the roof: a larger, well-oriented array earns more EPC credit.
• Combine measures: solar plus insulation and efficient heating moves the band furthest.
• Use an MCS-certified installer: required for SEG income and recognised on the assessment.
• Get a fresh EPC after installation: the improvement only shows once the home is reassessed.

Next steps

If improving your EPC is part of why you are considering solar, tell your installer, and arrange a new EPC assessment after the system is commissioned so the rating reflects it. To compare your options, get quotes from several MCS-certified installers. We match Cheltenham and Gloucestershire homeowners with vetted, accredited local firms, free and with no obligation, so you can weigh the EPC, bill and export benefits together before deciding.