In short: A typical 4kW solar panel system (about 10 panels, suiting many 3-bed homes) costs roughly £6,000–£8,000 fully installed in the UK in 2026, with quotes across sources ranging from about £5,500 to £9,000. Prices include 0% VAT, which is scheduled to end on 31 March 2027, when the rate returns to 5%. Adding a battery typically adds several thousand pounds.
Time-sensitive. Last verified: 30 September 2026. The 0% VAT rate on residential solar panels and batteries ends on 31 March 2027, and the government hasn’t said it will extend it. On a typical system that’s roughly £300–£450 extra from April 2027. See the deadlines table.
Solar prices vary by installer, roof and region, and you’ll find very different figures online. This guide gives you realistic UK ranges by system size, explains what’s included, shows a worked payback example and tells you what to check in a quote. For a general way to compare offers, read How to Compare Solar Quotes and Spot Red Flags.
How much do solar panels cost in the UK in 2026?
Most UK sources put a 4kW system at £6,000–£8,000 installed. Some report lower figures (from about £5,500) and others higher (up to about £9,000), depending on the installer, the equipment, the roof and scaffolding needs. Government data cited by one source shows that, across MCS-registered domestic installations in 2025/26, solar cost an average of about £1,955 per kW for systems up to 4kW and about £1,645 per kW for 4–10kW systems. Because it’s second-hand, check DESNZ’s solar PV cost data before quoting it as exact.
Solar panel cost by system size
| System size | Panels (about 400–450W) | Typical installed cost (0% VAT) | Typical home |
|---|---|---|---|
| 3kW | 7–8 | about £5,000–£7,000 | Small home, 1–2 bedrooms |
| 4kW | 9–10 | about £6,000–£8,000 | 3-bed semi, the most common size |
| 6kW | 13–15 | about £8,000–£11,000 | Larger family home, high use or EV |
| 8kW | 18–20 | about £11,000–£14,500 (estimated from per-kW figures) | Large home with a big roof |
Smaller systems cost more per kW because fixed costs (scaffolding, electrical work, certification) are spread over fewer panels. Work out your own size with How Many Solar Panels Do I Need?
What’s included in the price?
- Solar panels: for ten 400W panels, roughly £1,400–£2,400 according to one cost breakdown.
- Inverter: string, hybrid or microinverters. See String vs Microinverters.
- Mounting system: roughly £300–£600.
- Installation labour: often in the £1,000–£2,200 range for one to two days’ work.
- Scaffolding: a significant line item on many UK homes.
- Electrical work, commissioning and certification: including MCS certification and notifying your network operator.
- Monitoring hardware and app.
Ask for an itemised quote, and check what isn’t included (for example, consumer unit upgrades or roof repairs).
What does a battery add?
A battery typically adds about £3,000–£6,500, depending on size and brand. Sources put a 4kW system with a 5kWh battery at roughly £8,000–£12,500 fully installed, and a 5–6kW system with a 10kWh battery at roughly £11,000–£14,000. The range is wide, so compare several quotes. Whether a battery pays back depends on your tariff and export rate: see Solar Battery Cost in the UK, Do You Need a Solar Battery? and Smart Tariffs With Solar and Battery.
The 0% VAT deadline: 31 March 2027
Since April 2022, the installation of energy-saving materials, including solar panels and, since 2024, batteries, in homes has been zero-rated for VAT (HMRC VAT Notice 708/6). It’s now legislated to end on 31 March 2027. From 1 April 2027 the reduced rate of 5% applies. A House of Commons Library briefing published in September 2026 says the government hasn’t indicated it intends to extend the zero rate.
- What it’s worth: the change is from 0% to 5%, not to 20%. On a £6,000–£9,000 installation, that’s about £300–£450 more.
- Which date counts: VAT rules on the time of supply depend on things like when the work is completed, invoiced or paid, and the details can be technical. Ask your installer in writing which rate will apply to your contract, and check HMRC’s guidance.
- Northern Ireland has had the same zero rate since 1 May 2023, ending on the same date.
- Policy could change, for example at a Budget, so check the latest position before you sign.
Don’t let the deadline rush you. Some installers use it as a sales pressure tool. A rushed purchase from the wrong installer costs far more than £300–£450. Compare quotes and check credentials: How to Choose a Solar Installer and MCS Certification Explained.
Is solar worth the cost? An illustrative payback
Illustrative example only: a 4kW system costing £7,000 that generates about 3,400kWh a year (about 850kWh per kW). Suppose you pay roughly 25p per kWh for electricity (the Ofgem price cap changes every quarter, so check the current figure), you use 50% of the solar power yourself and export the rest.
| Export at 15p per kWh | Export at 5p per kWh | |
|---|---|---|
| Value of self-used power | 1,700 × £0.25 = £425 | £425 |
| Export income | 1,700 × £0.15 = £255 | 1,700 × £0.05 = £85 |
| Annual savings | £680 | £510 |
| Simple payback | about 10.3 years | about 13.7 years |
Sources typically quote annual savings of about £500–£850 for a 4kW system and payback of roughly 8–14 years, in line with this example. Your result depends on your usage, roof direction, tariff and export deal. See Smart Export Guarantee: Best Tariffs Compared and Solar Panel Payback Period in the UK, or calculate your own with How to Calculate Your Solar Payback Period.
What affects the cost of solar in the UK?
- System size: bigger systems cost less per kW.
- Equipment quality and brand. See Best Solar Panels for UK Homes.
- Roof type and access: tile, slate, flat, or a difficult roof can add cost. See Solar Panels on Flat, Metal, Tile and Slate Roofs.
- Scaffolding: particularly for taller or awkward houses.
- Electrical upgrades: such as a new consumer unit.
- Battery or EV charger add-ons.
- Location and installer overheads.
- Sales channel: aggressive door-to-door or telephone sales models often mean higher prices.
How much electricity will it generate?
A 4kW system in southern England typically generates about 3,200–4,000kWh a year, with lower output further north (one source puts Scotland at roughly 2,400–3,000kWh for 4kW). Output depends on roof direction, tilt and shading. See Do Solar Panels Work in the UK Climate? and Best Roof Direction and Angle.
Grants and financing
Government grants for ordinary homeowners have been limited, so most people pay themselves or finance the system. Check whether you qualify for any scheme in Solar Grants and Funding Schemes in the UK: What’s Actually Available. Compare cash, loans and leases carefully: Solar Loans vs Cash vs Lease.
Deadlines and things that change
Last verified 30 September 2026. Confirm with official sources before you rely on any of these.
| What | Date | What to do |
|---|---|---|
| 0% VAT on residential solar and batteries | 31 March 2027 | Returns to 5% from 1 April 2027 unless extended. Ask your installer which rate applies to your contract. |
| Electricity price cap (Ofgem) | Changes every quarter | Your savings depend on the price you pay, so recalculate with the current cap. |
| Smart Export Guarantee tariffs | Change often | Rates vary by supplier and change regularly. Compare before you install and again each year. |
| Quotes | Usually valid for a limited period | Check the expiry date, and be sceptical of "today only" discounts. |
How to get a fair price
- Get at least three itemised quotes from MCS-certified installers.
- Compare price per kW, expected annual generation and warranties. See How to Compare Solar Quotes and Spot Red Flags.
- Ask what’s included: scaffolding, consumer unit, monitoring, network notification.
- Check that the price reflects the right VAT rate and get it in writing.
- Check credentials and consumer protection: MCS certification, and membership of a consumer code such as RECC or HIES. See How to Choose a Solar Installer.
- Model your savings with your real tariff and export rate.
- Take your time. Don’t sign on a doorstep or under time pressure.
Common mistakes
- Believing a single average price as if it were your quote.
- Rushing to beat the VAT deadline and skipping comparisons.
- Assuming the price cap or export rates will stay the same.
- Not checking that the installer is MCS-certified, which is needed for export payments.
- Ignoring scaffolding and electrical costs that aren’t in the quote.
- Paying a large deposit up front.
Next steps
- Work out your system size and usage.
- Get itemised quotes and compare them.
- Check export tariffs: Smart Export Guarantee: Best Tariffs Compared.
- Calculate your payback: Solar Panel Payback Period in the UK.
Where to next:
Frequently asked questions
How much do solar panels cost in the UK in 2026?
A typical 4kW system costs roughly £6,000–£8,000 fully installed, though quotes range from about £5,500 to £9,000. Larger systems cost more in total but less per kW.
Is there VAT on solar panels in the UK?
Residential solar panel installations are currently zero-rated for VAT until 31 March 2027. From 1 April 2027 the reduced rate of 5% is scheduled to apply, unless the government extends the relief.
How much does a 4kW solar system cost?
About £6,000–£8,000 installed, including scaffolding, certification and 0% VAT. Prices vary by installer, equipment and roof.
How much do solar panels and a battery cost in the UK?
A 4kW system with a 5kWh battery typically costs somewhere between about £8,000 and £12,500, depending on brand and installer. A battery usually adds around £3,000–£6,500.
How long do solar panels take to pay for themselves in the UK?
Many estimates fall between roughly 8 and 14 years, depending on cost, how much power you use yourself and your export deal. Calculate yours with your own figures.
Will solar panel prices go up after March 2027?
VAT is scheduled to rise from 0% to 5% on 1 April 2027, which would add roughly 5% to the cost of a typical installation unless the government extends the relief. Equipment prices and installer costs may also change.