Costs
How Much Do Solar Panels Save Per Year in the UK? Real Numbers
The short answer is £400 to £1,000 per year for most UK homes — but the range is wide. Your…
October 7, 2026
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Solar panel prices in the UK have dropped by more than 70% over the past fifteen years, and 2026 is a genuinely good time to buy. But “how much does it cost?” still depends enormously on your roof, your electricity habits, and whether you want a battery alongside the panels. This guide gives you real 2026 figures — not vague ranges — so you can walk into any installer conversation knowing what a fair quote looks like.
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Key Takeaways
- A typical 4kW system costs £6,000–£9,000 fully installed in 2026.
- Adding a 5–10kWh battery adds roughly £3,500–£6,000 to the total.
- System size matters: 3kW suits smaller homes; 6kW makes sense for high energy users or those with EVs.
- Labour typically accounts for 15–25% of the total quote.
- Ongoing costs are low — expect annual maintenance of around £100–£200.
- No VAT on residential solar installations in the UK (0% until at least 2027).
Solar Panel Cost by System Size: 2026 Price Table
The biggest factor in your quote is how many kilowatts of peak capacity you’re installing. Below are realistic 2026 installed costs across the most common residential system sizes. These figures include panels, inverter, mounting hardware, cabling, and labour — everything to the point of switch-on.
| System Size | Typical Panels | Annual Output (UK avg) | Installed Cost (panels only) | With 5–10kWh Battery |
|---|---|---|---|---|
| 3 kW | 7–8 x 400W panels | 2,550–2,700 kWh | £4,500–£6,500 | £8,000–£12,000 |
| 4 kW | 9–10 x 400W panels | 3,400–3,600 kWh | £6,000–£9,000 | £9,500–£15,000 |
| 5 kW | 11–13 x 400W panels | 4,250–4,500 kWh | £7,500–£11,000 | £11,000–£17,000 |
| 6 kW | 14–15 x 400W panels | 5,100–5,400 kWh | £9,000–£13,000 | £12,500–£19,000 |
Output estimates assume a south-facing roof with no shading and UK average solar irradiance of approximately 1,100 kWh/m²/year. East or west-facing roofs will produce around 80% of these figures. Read our east/west facing guide if your roof isn’t south-facing.
What’s Actually Included in a Solar Quote?
When an installer gives you a price, it should cover several distinct components. Understanding what each costs helps you spot a suspiciously cheap quote — or an inflated one.
Solar panels
Panels themselves typically cost £200–£400 each at trade prices. For a 10-panel 4kW system, that’s £2,000–£4,000 in hardware alone. Tier 1 manufacturers (Jinko, Longi, REC, SunPower) sit at the higher end but offer stronger performance guarantees. Budget brands may look tempting at £150/panel but often come with weaker warranties and faster degradation.
Inverter
The inverter converts DC electricity from your panels into AC power for your home. String inverters cost £500–£1,500 and are the standard choice. Microinverters (one per panel) cost more — typically £1,500–£3,000 for a 4kW system — but give per-panel monitoring and perform better on shaded or complex roofs. Hybrid inverters, which also manage battery charging, cost £1,000–£2,500 and are increasingly common in new installations.
Mounting and installation labour
Scaffold, roof mounting rails, clamps, DC cabling, AC isolators, and generation meter typically add £1,000–£2,500 to a quote. Labour for a standard 4kW installation on a straightforward pitched roof usually takes one or two days for a two-person team and is priced at £500–£1,500. Roof complexity — multiple planes, slate tiles, flat roofs — can push labour costs significantly higher.
DNO application and grid connection
For systems up to 3.68kW (16A per phase), your installer simply notifies your Distribution Network Operator (DNO) under G98 rules. Larger systems require a G99 application, which involves an engineering assessment and can take 30–90 days. Most installers handle this for you. There’s usually no extra charge for G98 notification, while G99 may add £150–£500 to the quote.
Battery Storage: The Cost-Benefit Calculation
Battery storage lets you use solar electricity you’d otherwise export to the grid — typically shifting self-consumption from around 30–40% to 60–80% of your annual generation. Whether that’s worth paying for depends on how much you export, what your export tariff pays, and what you pay for grid electricity.
In 2026, a 5kWh battery typically costs £3,500–£5,000 installed. A 10kWh unit runs to £5,000–£7,000. The most popular residential batteries are the Tesla Powerwall 3, Givenergy AIO, and Solis RHI range. See our full battery storage review for a detailed comparison of the leading options.
The financial case for battery storage strengthens considerably if you’re on a time-of-use tariff like Octopus Flux or Intelligent Octopus, because you can also charge the battery from cheap overnight grid electricity and discharge it during expensive peak periods. This makes the battery earn money even on cloudy days.
For a full analysis of whether battery storage justifies its upfront cost, see our solar battery payback guide.
What Drives the Price Up (or Down)?
Two quotes for the same system size can differ by £2,000–£3,000 and both be legitimate. Here are the main variables that affect your final price:
- Roof type: Concrete tile is cheap to work on; natural slate, clay pantile, or flat roofs cost more in time and specialist fixings.
- Roof pitch and height: Steeper or higher roofs need more scaffold time. A two-storey house with a steep pitch can add £300–£600 versus a bungalow.
- Shading: Trees, chimneys, or neighbouring buildings may require microinverters or power optimisers, which add cost but recover lost output.
- Panel quality: Tier 1 panels with strong performance warranties cost more upfront but lose output more slowly over 25 years.
- Installer overhead: Large national installers often quote higher due to marketing costs. MCS-certified local installers frequently offer better value. Always get three quotes.
- Location: London and the South East tend to command 10–15% higher labour costs than the Midlands or North.
Ongoing Costs: What to Budget After Installation
One of solar’s underrated advantages is that its running costs are genuinely low. Here’s what you should realistically budget for:
Annual maintenance
Solar panels have no moving parts and require little maintenance. An annual check — clearing any debris from panel edges, verifying the inverter is reporting correctly, and checking mounting bolts — costs £100–£150 if done by a professional, or nothing if you’re comfortable doing a visual inspection yourself. The Energy Saving Trust recommends a professional service every three to five years.
Inverter replacement
String inverters typically last 10–15 years. Budget £500–£1,500 for a replacement mid-system-life. Many manufacturers now offer extended warranties (up to 20 years) for an upfront fee, which can be worth purchasing at installation. Microinverters generally last the full panel lifespan (25+ years), which is one argument for their higher upfront cost.
Insurance
Most home insurers cover solar panels as a standard building fixture once you notify them. Premiums rarely increase significantly — expect an extra £0–£50/year. Always inform your insurer when panels are installed; failing to do so could invalidate a buildings claim. Check that your sum insured still covers the rebuild cost with the additional panel installation value.
VAT, Grants and Reducing Your Upfront Cost
Solar panels and battery storage installed on residential properties in Great Britain currently attract 0% VAT, a relief introduced in April 2022 and extended through at least 2027. On a £8,000 system, that’s a saving of £1,600 compared to the standard 20% rate. This applies to both the materials and the installation labour.
There is no universal grant for solar panels in England in 2026, but there are ways to reduce costs. The ECO4 scheme can fund solar as part of a whole-home retrofit for households on qualifying benefits — check eligibility via gov.uk. The Great British Insulation Scheme doesn’t cover solar directly but can fund insulation work that improves the overall economics. Some local councils run their own solar grant schemes — worth checking your council’s website.
Once installed, the Smart Export Guarantee (SEG) pays you for every unit of surplus electricity you export to the grid. Rates in 2026 range from 4p/kWh (standard offers) up to 15p/kWh on the best variable tariffs. Over a year, a 4kW system might export 1,000–1,500 kWh, earning £40–£225 depending on your tariff. See our SEG best rates guide for the current top payers.
For a full assessment of whether solar makes financial sense for your home, our solar panels worth it guide walks through the complete calculation, and our grants guide covers every current funding route in detail.
Conclusion
A 4kW solar system in 2026 costs £6,000–£9,000 installed, before battery storage. The 0% VAT rate helps, there are no grants to navigate for most homeowners, and the Smart Export Guarantee ensures you’re paid for what you don’t use. Get three quotes from MCS-certified installers — the MCS certification is your main quality assurance — and compare them against the figures in this guide. The market is competitive enough that a well-informed buyer gets a significantly better deal than one who accepts the first quote.