How much do solar panels cost in the UK in 2026?

A typical 4kW solar panel system costs £6,500–£8,000 fully installed. A 3kW system runs £5,000–£6,500, while a larger 6kW system costs £9,000–£11,500. All prices include panels, inverter, mounting, wiring, scaffolding, and MCS-certified installation. 0% VAT applies until 31 March 2027.

How much does solar cost with a battery?

A 4kW solar system with a battery storage unit typically costs £10,000–£14,000 installed. The battery alone adds £4,000–£8,000 depending on capacity (5kWh to 13kWh). A battery increases self-consumption from around 40% to 70–80%, which improves annual savings.

What is the payback period for solar panels in the UK?

Solar-only systems typically pay back in 9–14 years. Systems with battery storage take 10–16 years. Payback depends on roof orientation, regional solar yield, your electricity usage, and your SEG export rate. South-facing roofs in southern England see the fastest payback.

Is there VAT on solar panels in 2026?

No — 0% VAT applies to residential solar panel installations until 31 March 2027. This saves roughly £1,200–£2,200 on a typical system. After that date, unless extended, the standard 20% rate returns.

◐ SOLAR · 10 MIN READ · OCTOBER 2026

Solar panel costs UK 2026

What you'll actually pay for a 3kW to 6kW system, with and without battery storage. Real installed prices, what's included, and how to reduce the bill.

The short version: a typical 4kW solar system costs £6,500–£8,000 fully installed in 2026. Add a battery and you're looking at £10,000–£14,000. 0% VAT applies until March 2027, saving roughly £1,200–£2,200. A south-facing system pays back in 9–14 years and generates £15,000–£25,000 over its 25-year warranty.

Solar panel prices by system size

These are fully installed prices — panels, inverter, mounting hardware, wiring, scaffolding, and labour from an MCS-certified installer. All figures include the current 0% VAT rate.

System size	Panels	Installed cost	Annual saving	Payback
3 kW	7–8	£5,000–£6,500	£350–£400	13–15 yrs
4 kW ★	9–10	£6,500–£8,000	£465–£585	10–13 yrs
5 kW	11–13	£8,000–£10,000	£600–£750	11–14 yrs
6 kW	14–16	£9,000–£11,500	£700–£900	10–13 yrs
4 kW + battery	9–10	£10,000–£14,000	£585–£850	12–16 yrs

★ Most common size for a 3-bedroom UK home. Annual savings assume south-facing roof, average UK electricity usage (2,900 kWh/yr), Ofgem cap rates (~24.5p/kWh import), and standard SEG export rates.

What's included in the price

A reputable MCS-certified installer's quote should cover everything you need for a working system:

Solar panels — typically monocrystalline, 400–430W each. Premium panels (e.g. SunPower, LG) cost more per watt but offer better efficiency and longer warranties.
Inverter — either a string inverter (one unit, £500–£1,000) or microinverters (one per panel, £800–£1,500 total). Microinverters handle partial shading better.
Mounting system — roof hooks, rails, and clamps. Cost varies by roof type — flat roofs need angled frames.
Wiring and electrical work — AC/DC cabling, consumer unit connection, generation meter.
Scaffolding — typically £300–£500. Some installers include it; others quote it separately.
MCS certification and DNO notification — your installer registers the system and notifies your local Distribution Network Operator.

Battery storage costs

Adding a battery lets you store daytime solar generation for evening use, raising self-consumption from roughly 40% to 70–80%. Here's what batteries cost in 2026:

Battery capacity	Installed cost	Best for
5–7 kWh	£4,000–£6,000	1–2 bed homes, lower usage
8–10 kWh	£6,000–£8,000	3-bed home, average usage
10–13 kWh	£8,000–£10,000+	4+ bed homes, EV charging, high usage

Ordering solar and battery together is usually cheaper than retrofitting a battery later, because the installer only needs to scaffold and wire once. Expect to save £500–£1,000 by bundling.

What affects the price

Two identically-sized systems can cost very different amounts. The main variables:

Panel brand and efficiency — budget panels (Trina, JA Solar) cost less per watt than premium panels (SunPower, REC Alpha). Premium panels generate slightly more per square metre, which matters on a small roof.
Roof complexity — a simple south-facing pitched roof is the easiest and cheapest install. Flat roofs, multiple roof faces, dormers, or slate tiles all add cost. Complex roof installs can add £1,000–£3,000.
Inverter choice — microinverters cost more upfront but handle partial shading and monitoring better. String inverters are cheaper but the whole array drops if one panel is shaded.
Location — installers in London and the South East typically charge more due to higher labour and travel costs.
Access — difficult access (narrow lanes, high roofs, conservation area requirements) increases scaffolding and installation time.

How to reduce the cost

There are several legitimate ways to bring down the price:

0% VAT — applies to all residential solar installations until 31 March 2027. This alone saves £1,200–£2,200 on a typical system. After that, unless extended, the standard 20% rate returns.
ECO4 grants — if your household is on a qualifying benefit and your home has an EPC rating of D–G, you may qualify for free or heavily subsidised solar. The scheme closes 31 December 2026, so check now. Use our eligibility checker.
Warm Homes Local Grant (England) — covers solar within wider energy improvement packages for low-income households.
Home Energy Scotland loans — interest-free loans of up to £7,500 for solar installations in Scotland.
Consumer Loan Scheme — launches April 2027 with 0% interest loans for solar and energy efficiency measures.
Get three quotes — always. Prices vary significantly between installers. Verify MCS certification at mcscertified.com.

Annual savings and payback

Your savings come from two sources: reducing your electricity bill (self-consumption) and earning from exported electricity (Smart Export Guarantee).

For a typical 4kW system on a south-facing roof:

Without battery: ~40% self-consumption. Annual saving of £465–£585. Payback in 10–13 years.
With battery: ~70–80% self-consumption. Annual saving of £585–£850. Payback in 12–16 years.

Over a 25-year panel warranty, a 4kW system generates roughly £15,000–£25,000 in total value — well above the install cost. The system continues generating after 25 years too, just at slightly reduced efficiency (panels typically degrade at 0.5% per year).

Model your own numbers — our solar calculator accounts for your postcode, roof orientation, pitch, shading, usage pattern, and current tariff. It gives a personalised payback estimate, not a generic UK average. Run the calculator →

Is it cheaper to wait?

Solar panel prices have fallen roughly 80% over the past decade, but the rate of decline has slowed significantly. In 2026, prices are broadly flat compared to 2025. There are two reasons not to wait:

0% VAT ends March 2027 — that alone adds £1,200–£2,200 to a typical install if not extended.
Every month you wait is a month of savings you miss — a 4kW system saves roughly £40–£50/month. Waiting a year for a potential 5% price drop costs more in lost savings than you'd gain.

The best time to install was five years ago. The second-best time is before the VAT window closes.

Updated October 2026. Prices based on MCS installer surveys, industry pricing data, and Ofgem Q4 2026 cap rates. Savings estimates use PVGIS yield data for central England. This article is general information, not financial or installation advice.