In a world increasingly focused on sustainability and energy efficiency, many UK homeowners and landlords turn to solar photovoltaic (PV) panels to improve their Energy Performance Certificate (EPC) ratings. But does installing solar PV automatically guarantee a higher EPC score?
Let’s take a deep dive into the connection between solar energy and EPC outcomes.
What Is an EPC?
An Energy Performance Certificate (EPC) is a legal document that shows how energy-efficient a property is. Rated on a scale from A (most efficient) to G (least efficient), it provides key data on:
Energy use
Estimated energy costs
Recommendations to improve efficiency
EPCs are mandatory for selling, renting, or building properties in the UK.
How EPC Ratings Are Calculated
The EPC rating is calculated using the Standard Assessment Procedure (SAP), which considers:
Building materials
Insulation
Heating and cooling systems
Lighting
Renewable technologies (like solar panels)
How Solar PV Influences Your EPC
Installing solar PV can positively influence your EPC rating in the following ways:
Reduced Energy Bills: Solar panels lower the demand for electricity from the grid.
Lower CO₂ Emissions: Solar is renewable and doesn’t produce direct emissions.
Improved SAP Score: The SAP method awards points for on-site renewable energy production.
➡️ This means solar PV often contributes to a higher EPC rating — but it’s not a guarantee.
When Solar PV Might Not Improve Your EPC
Even with solar PV installed, some properties don’t see a significant improvement due to:
Poor insulation or outdated heating systems
Inadequate system size or orientation (north-facing roofs, heavy shading)
EPC assessment software limitations that underrepresent solar contributions
Maximising Your EPC Rating with Solar
To ensure solar PV helps improve your rating:
✅ Upgrade insulation (loft, walls, floors)
✅ Use high-efficiency heating systems (like air source heat pumps)
✅ Combine solar PV with battery storage
✅ Schedule a professional EPC assessment after all upgrades
Real-World Example
A London homeowner installed a 3kW solar PV system expecting to jump from a D to a B rating. The final EPC showed only a minor improvement because of an old boiler and poor wall insulation. After upgrading the heating system and improving insulation, a re-assessment placed the property solidly in Band B.
Conclusion: Solar Helps — But It’s Not a Silver Bullet
Solar PV is a powerful tool for improving energy efficiency and reducing carbon emissions. However, it must be part of a holistic energy strategy that includes insulation, modern heating, and smart controls to truly maximise your EPC rating.
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