Six hospitals across Cornwall will install solar panels this year, a move the NHS Trust says will cut its energy bill by £1.5m annually. The project, backed by a £3.2m grant from the government’s Public Sector Decarbonisation Scheme, will cover rooftops and carports with photovoltaic arrays.
As Cornish Times reports, the NHS Trust expects to generate enough electricity to power the equivalent of 1,200 homes each year. But the real story for UK homeowners is simpler: if hospitals can make solar work on their vast roofs, the case for smaller domestic installations is now stronger than ever.
What it costs a typical 3-bed semi
A standard 4kW solar panel system costs between £5,000 and £8,000 to install, including the inverter and scaffolding. With 0% VAT on solar panels (extended until March 2027), that saving alone is around £1,000–£1,600. A typical 3-bed semi using 3,500 kWh annually can expect to generate about 3,400 kWh per year from a south-facing 4kW array, covering roughly 60–70% of its electricity needs.
Annual savings on electricity bills typically range from £300 to £500, depending on how much of the generated power is used directly. The Smart Export Guarantee (SEG) pays households for excess electricity fed back to the grid, at rates typically between 4p and 15p per kWh. Ofgem data from 2023 shows the average SEG rate was 5.5p per kWh, adding around £100–£150 extra income for a typical system.
Who qualifies, and who doesn’t
Solar panels work best on south-facing roofs with a pitch of 20–50 degrees, and minimal shading from trees or chimneys. East or west-facing roofs still generate about 80% of the optimal yield. But not everyone can install: homes with north-facing roofs, listed buildings, or those in conservation areas may face planning restrictions. For these households, solar tiles or in-roof panels are an alternative, though they cost 20–30% more.
Low-income households can access free solar panels through the government’s ECO4 scheme, which targets fuel-poor homes with an EPC rating of D or below. The Home Upgrade Grant (HUG) also covers solar for off-gas-grid homes. Applications are managed by local authorities; Cornwall Council, for instance, ran a similar programme in 2023.
The catch is that ECO4 funding is limited and depends on your energy supplier. The scheme runs until March 2026, but some suppliers have already closed their waiting lists due to high demand.
EPC impact and resale value
Solar panels can lift an EPC rating from band D to band C, or from C to B, according to Energy Saving Trust estimates. This improvement can add 2–5% to a property’s value, according to a 2022 study by the Royal Institution of Chartered Surveyors. For a typical £300,000 home, that’s an extra £6,000–£15,000, more than the installation cost.
Yet the government’s proposed changes to EPC methodology, due in 2025, may give less weight to solar generation if the home lacks battery storage. The Department for Energy Security and Net Zero has not confirmed the final formula, so buyers should check current EPC certificates before relying on solar-driven ratings.
What homeowners should do now
Check your roof orientation and shading using a free online tool like the Energy Saving Trust’s solar calculator. Get at least three quotes from MCS-certified installers (the Microgeneration Certification Scheme is mandatory for SEG eligibility). Apply for a home energy survey through your local council if you think you qualify for ECO4. And if you’re planning a solar install, do it before the 0% VAT deadline ends in March 2027, the rate will revert to 20% unless the government extends it again.
Frequently Asked Questions
Yes, if you meet eligibility criteria under the ECO4 scheme or Home Upgrade Grant. You must have an EPC rating of D or below, live in a low-income household, or receive certain benefits. Contact your local authority or energy supplier to check availability.
Solar panels typically last 25–30 years, with inverters needing replacement after 10–15 years (costing £800–£1,200). Maintenance is minimal, cleaning once a year with rainwater usually suffices, but check that panels are free from debris and shading from overgrown trees.
