How Much Do Solar Panels Cost in the UK? (2026 Guide)

The headline system size is the biggest factor, but several other things influence what you'll actually pay. Roof type matters — flat roofs require additional mounting frames (adding £500–£1,000), and slate roofs need specialist fixings compared to standard tiles.

Scaffolding is included in most quotes but can add £300–£800 for complex or multi-storey properties. Panel brand also affects price: budget panels (Trina, JA Solar) cost less than premium brands (SunPower, LG), though the efficiency gap has narrowed considerably.

Regional pricing varies too. According to MCS data, the average cost per kW is around £1,590 nationally, but installations in the South East tend to cost 10–15% more than in the North East. Rural properties may also attract higher costs due to installer travel time.

"Cost per kWh" means two different things with solar, and it's worth separating them. The first is the installed cost per kW of capacity — what you pay upfront for each kilowatt of panels. In 2026 this sits at roughly £1,500–£1,700 per kW, so a 4kW system works out at about £6,000–£8,000. Larger systems usually cost slightly less per kW because the fixed costs (scaffolding, inverter, DNO paperwork) are spread across more panels.

The second — and more useful — figure is the lifetime cost per kWh generated. A 4kW system produces around 3,400 kWh a year, or roughly 85,000 kWh over a 25-year life (allowing for gradual output loss). Spread a £7,000 upfront cost across that generation and each unit of solar electricity costs you about 5–8p per kWh. Compare that with the mid-2026 grid price of around 24–25p per kWh and it's clear why solar is one of the cheapest ways to power your home.

These lifetime figures ignore SEG export earnings and any electricity-price rises — both of which push the real cost per kWh lower still. They also assume no battery; adding storage raises the upfront cost but lets you use more of your own generation instead of exporting it cheaply.

Adding a battery storage system lets you use more of your solar electricity rather than exporting it at low SEG rates. A typical 5kWh home battery costs £2,500–£4,000 installed, while larger 10kWh units cost £4,000–£6,500. The most popular option in 2026 is pairing a 4kW solar array with a 5–10kWh battery. For a deeper look at how to size a battery, which chemistry to choose and whether AC- or DC-coupled is right for you, see our full solar battery storage UK guide.

With battery storage, you can increase your self-consumption from roughly 40–50% to 70–80%, significantly improving your savings. However, the payback period for the battery element alone is typically 10–14 years, so the financial case is weaker than for the panels themselves.

Your savings depend on three things: how much electricity you use, when you use it, and your current tariff. At the April 2026 Ofgem price cap of 24.5p/kWh, a 4kW system generating around 3,400 kWh per year saves you roughly £500–£800 annually through a combination of reduced bills and SEG export payments.

Households that are home during the day or can shift consumption (running washing machines, dishwashers, and EV charging while the sun is out) save the most. If you work from home, you could realistically use 50–60% of your solar generation directly.

With an electric vehicle, the savings increase further — charging from solar rather than the grid saves 20–24p per kWh, which adds up to £200–£400 per year for typical driving.

The Smart Export Guarantee replaced the old Feed-in Tariff in 2020. All energy suppliers with over 150,000 customers must offer an export tariff, though rates vary significantly. In 2026, the best fixed-rate SEG tariffs pay 12–15p per kWh, while variable rates track wholesale prices. To register for SEG you'll need a working SMETS2 smart meter so the supplier can record half-hourly export readings — without one, most suppliers won't pay out.

A 4kW system typically exports around 50% of its generation (about 1,700 kWh), earning £100–£250 per year from SEG payments. Octopus Energy's Flux tariff and similar time-of-use export deals can be more lucrative if you have a battery and can export during peak evening hours. To see how those SEG earnings stack alongside visibility, load-shifting and EV-tariff savings, run them through our smart meter savings calculator for a two-minute estimate of the total annual saving.

The payback period is how long it takes for your cumulative savings to equal the upfront cost. For a typical 4kW system at £7,000, saving £650 per year, payback is around 10–11 years. Factor in 0% VAT savings and a competitive SEG tariff, and this drops to 7–9 years.

After payback, a 4kW system generates £650+ in annual savings for the remaining 15–20 years of its life. Over 25 years, the total financial benefit of a £7,000 system is typically £9,000–£14,000 — a solid return on investment.

Payback is shortest for households that use more of their generation directly — being home during the day, running appliances while the sun is out, or charging an EV from solar all shorten it. A poor roof aspect, heavy shading, or exporting most of your generation at low SEG rates pushes it toward the longer end of each range.

Solar PV installations in the UK currently benefit from 0% VAT, which was introduced in April 2022 and is confirmed until 31 March 2027. This saves roughly £1,000–£2,000 on a typical installation — it is effectively a government subsidy.

There is no direct grant for solar panels equivalent to the £7,500 heat pump BUS grant. However, low-income households in England may qualify for free or subsidised solar through the ECO4 scheme or local authority programmes. In Scotland, Home Energy Scotland offers interest-free loans and cashback grants that can cover solar PV.

There are three main types of solar panel available in the UK. Monocrystalline panels are the most popular, offering the best efficiency (20–22%) and a sleek black appearance. They cost slightly more but generate more power per square metre, making them ideal for smaller roofs.

Polycrystalline panels are cheaper but less efficient (15–17%) and have a blue, speckled look. They're becoming less common as monocrystalline prices have dropped. Thin-film panels are the least efficient but work well in partial shade and can be integrated into building materials — though they're rarely used for domestic rooftop installations.

The right system size depends on your electricity usage, available roof space, and budget. The average UK household uses around 3,500 kWh of electricity per year. A 4kW system (10 panels) generates roughly 3,400 kWh annually — close to covering your full usage on paper, though you'll still draw from the grid at night and on cloudy days.

If you have an electric car or heat pump, you'll want a larger system — 5–6kW is sensible for households with high electricity demand. Each standard 400W panel needs about 1.7m² of roof space, so a 4kW system requires around 17m² of south-facing roof.

The ideal roof faces south, has a pitch of 30–40 degrees, and is unshaded. But solar panels still work well on east or west-facing roofs — you'll get around 15–20% less output compared to a perfect south-facing installation. North-facing roofs are generally not recommended.

Shading from trees, chimneys, or neighbouring buildings can reduce output significantly. Modern panels with optimisers or microinverters handle partial shading better than older string inverter systems. Your installer should carry out a shading analysis as part of the quote — be wary of any who skip this step.

Always use an MCS-certified installer — this is a requirement for SEG eligibility and any future government support schemes. Get at least three quotes and check that each includes scaffolding, electrical work, and all DNO (Distribution Network Operator) notification fees.

Look for RECC (Renewable Energy Consumer Code) membership, which provides an additional layer of consumer protection. Check reviews on Trustpilot and Google, and ask for references from recent local installations. Avoid door-to-door sales companies offering "free" panels — these typically involve long-term contracts that limit your savings.

For most homeowners with a suitable roof, yes. The combination of 0% VAT, falling panel prices, high electricity costs, and SEG payments makes the financial case stronger than it has ever been. A 4kW system costing £7,000 will typically return £9,000–£14,000 over its lifetime.

Solar panels also add value to your property. Research from the Department of Energy suggests homes with solar panels sell for 2–4% more. And unlike boiler replacements or new windows, solar panels have virtually zero maintenance costs — an occasional clean and an inverter replacement after 10–15 years (£500–£1,000) is all that's needed.

The biggest risk is that electricity prices fall significantly, reducing your savings. But with the UK's net zero targets and increasing demand from EVs and heat pumps, most analysts expect electricity prices to remain elevated throughout the 2020s and 2030s.