More than 200,000 UK homes have installed solar panels in the first nine months of 2024, a 60% jump on the same period last year. The surge, as reported by Transport + Energy, is not a slow drift, it is a stampede.
The driving force is simple. A typical 4kW solar photovoltaic (PV) system now costs between £5,000 and £8,000 fully installed, according to the Energy Saving Trust. For a semi-detached home using 3,500 kWh of electricity a year, that system can cut the annual bill by £300 to £600, and that is before selling surplus power back to the grid via the Smart Export Guarantee (SEG), which pays around 5p–15p per kWh exported.
Who qualifies, and who doesn’t
Most homes with a south-, east-, or west-facing roof that is unshaded between 10am and 4pm are suitable. The system itself typically covers 15–20 m² of roof area. But the catch is roof condition: if your roof needs replacing within the next 10 years, you should do that first. Panels last 25–30 years, so a dodgy roof underneath undermines the investment.
Households in conservation areas or listed buildings face extra planning hurdles. And renters, about 4.5 million UK households, are largely locked out unless their landlord opts in. That is a policy gap the government has yet to address.
What it costs a typical 3-bed semi
The upfront cost remains the biggest barrier. A 4kW system with battery storage pushes the total to £8,000–£12,000. However, the 0% VAT on solar installations, introduced in April 2023, saves about £1,000 on a typical system. Payback time is 10–15 years, but if you are on a standard variable tariff and plan to stay put for a decade, the maths works.
Solar also lifts your EPC rating. A D-rated home can gain 8–10 points from a well-sized array, moving it to a C or even a B. That matters if you are selling, a C-rated home typically sells for 2–5% more than a D-rated equivalent, per Rightmove data cited by the Energy Saving Trust.
But the grid is not ready
Yet the boom brings a problem. National Grid’s distribution networks are struggling to handle the influx of solar exports on sunny afternoons. In some regions, new solar installations now face connection delays of up to six months. Ofgem acknowledged the bottleneck in its September 2024 electricity distribution report, promising reforms to speed up approvals.
The other risk is that SEG rates may fall as more homes export power. Currently the best SEG tariffs pay around 15p/kWh, but some suppliers offer as little as 4p. Shopping around for the best export deal is as important as choosing the right installer.
What to do and by when
If you are considering solar, start with a roof survey and an EPC assessment. The Energy Saving Trust’s solar calculator gives a rough payback estimate. Apply for quotes from at least three MCS-certified installers (check the MCS database). The 0% VAT is permanent, so no rush there, but if you want panels installed before next summer’s higher generation months, begin the process now. Connection applications to your Distribution Network Operator can take 8–12 weeks.
For renters and flat-dwellers, community solar schemes, where you buy a share in a local array, are an alternative. The government’s Solar Together group-buying scheme operates in many council areas and can cut installation costs by 15–20%.
Frequently Asked Questions
A typical 3-bed semi with a 4kW system can save £300–£600 per year on electricity bills, plus earn 5p–15p per kWh exported via the Smart Export Guarantee. Savings depend on your energy usage, roof orientation, and whether you have battery storage.
Yes. A well-sized solar PV system can boost an EPC rating by 8–10 points, potentially moving a D-rated home to a C or B. This can increase property value by 2–5% according to estate agent data.
