Solar Panel Installation Cost — August 2026 (UK)
Solar panel installation costs roughly £1,400–£1,800 per kWp in August 2026. That puts a typical 4kWp system (about 10 panels) at £5,500–£7,500 fitted, and a larger 6kWp system at £8,500–£11,500. Domestic solar still benefits from 0% VAT until 31 March 2027, and adding a battery costs another £2,000–£5,000. Prices have held broadly steady through 2026 as panel costs stay low and installer demand stays high. Here's the current snapshot and what moves your number.
Solar installation cost by system size — August 2026
Installed prices including scaffolding and inverter, August 2026. Source: BestBuilders 2026 quote data across 519 UK towns. Battery is an optional add-on shown for reference.
Solar panel installation cost by system size (2026)
System size is the biggest single factor in what you pay, and larger systems are cheaper per kWp because the fixed costs — scaffolding, inverter, labour, paperwork — are spread across more panels. The table shows typical fully-installed prices in August 2026 for a standard pitched roof.
| System size | Panels (approx) | Typical installed cost | Cost per kWp |
|---|---|---|---|
| 3 kWp | 8 | £4,500–£6,000 | £1,500–£2,000 |
| 4 kWp (typical) | 10 | £5,500–£7,500 | £1,400–£1,850 |
| 5 kWp | 13 | £7,000–£9,500 | £1,400–£1,900 |
| 6 kWp | 16 | £8,500–£11,500 | £1,400–£1,900 |
Prices include panels, inverter, mounting, scaffolding, DC/AC works and commissioning, at 0% VAT. A battery, bird-proofing or a roof in poor condition sit on top.
What drives the price
Two identical-looking roofs can attract very different quotes. These are the factors that move the number the most:
- System size and panel count — the single biggest driver, though the price per kWp falls as the system grows.
- Panel and inverter brand — premium mono panels and hybrid or micro-inverters add a few hundred pounds but improve output and future battery-readiness.
- Roof type and height — slate, a steep pitch or a three-storey house needs more scaffolding and labour than a simple two-storey tiled roof.
- Scaffolding — typically £600–£1,200 and almost always required; awkward access pushes it higher.
- Electrical works — a consumer-unit upgrade or a long cable run to the inverter adds cost.
- Battery and extras — storage, bird-proofing and a solar diverter for hot water all add to the base install.
Panel types and regional variation
Almost all new domestic installs in 2026 use monocrystalline panels — they are more efficient than older polycrystalline panels and prices have converged, so there is little reason to choose anything else for a home roof. Where you might pay more is for all-black panels for looks, or high-efficiency panels where roof space is tight.
| Panel choice | Best for | Cost effect |
|---|---|---|
| Standard monocrystalline | Most roofs — the default | Baseline |
| All-black monocrystalline | Front-facing roofs where looks matter | +5–10% |
| High-efficiency / N-type | Small roofs needing maximum output | +10–20% |
| Solar roof tiles (BIPV) | New roofs or conservation areas | 2–3x panels |
Regional variation is smaller for solar than for building work because so much of the cost is the hardware, but labour and scaffolding still make London and the South-East around 10% dearer than the North and Scotland. Compare our detailed solar panels cost page for a full national picture.
VAT and grants in 2026
Domestic solar panel installations in Great Britain carry 0% VAT until 31 March 2027, which is already reflected in the quoted prices above — there is no VAT to add. Beyond that, there is no universal solar grant in 2026, but low-income and lower-EPC households may qualify for help through the Warm Homes Plan and related local schemes. Check eligibility before you assume you have to pay full price.
The main ongoing income is the Smart Export Guarantee (SEG), which pays you for the electricity you export to the grid. To qualify, your system must be installed by an MCS-certified installer and you apply through an energy supplier — so ask any installer to confirm their current MCS certification before you book. See how to get a solar panel grant in 2026.
Adding a battery
A home battery stores daytime generation for use in the evening, lifting the share of your own solar you actually use from around 30–50% to 70% or more. In August 2026 a battery adds roughly £2,000–£5,000 depending on capacity, fitted alongside the panels.
| Battery capacity | Suits | Typical added cost |
|---|---|---|
| 3–4 kWh | Smaller homes, topping up evenings | £2,000–£3,000 |
| 5–6 kWh | Typical family home | £3,000–£4,500 |
| 8–10 kWh | High evening use or EV charging | £4,500–£6,500 |
Fitting the battery at the same time as the panels is cheaper than retrofitting later, because the scaffolding, electrician and paperwork are shared.
Payback and savings
At August 2026 energy prices, a typical 4kWp system saves a household roughly £600–£1,000 a year through a mix of lower bills and SEG export payments, which puts payback at around 7–10 years. The panels then keep generating for another 15–20 years, so most of the lifetime output is effectively free once the system has paid for itself.
You improve payback by using more of your generation during the day — running the dishwasher, washing machine or an EV charger while the sun is out — and by pairing the system with a battery and a good export tariff. Panels themselves last 25–30 years, though the inverter usually needs replacing once at around year 12–15, budget £800–£1,500 for that.
Planning permission and building regulations
Most domestic roof-mounted solar is permitted development, so no planning application is needed, provided the panels sit close to the roof slope and do not project above the highest part of the roof. The main exceptions are listed buildings, conservation areas and flat roofs where panels stand proud — check with your local planning authority if any of those apply.
The electrical work must comply with Building Regulations Part P and be certified, and the installation should be notified to your Distribution Network Operator (DNO). An MCS-certified installer handles the certification and DNO notification as part of the job.
What is in the price — and what isn't
A standard solar quote covers the full working system on a sound roof. Watch for these items, which can sit outside the headline figure:
Usually included
- Panels, mounting rails and roof fixings
- Inverter and cabling to your consumer unit
- Scaffolding, installation labour and commissioning
- MCS certification, DNO notification and handover paperwork
Sometimes extra
- Battery storage — £2,000–£5,000 as above.
- Consumer-unit upgrade — £300–£800 if your board is old or full.
- Bird-proofing mesh — £300–£600, worth it in urban areas.
- Roof repairs — a tired roof may need work before panels go on.
- Solar diverter — £200–£500 to send surplus to your hot-water cylinder.
A standard 4kWp install takes one to two days on site once scaffolding is up, and the system is generating the day it is commissioned.
What to check before you book
Use these checks yourself before signing — they protect your SEG income and your roof:
- Ask to see current MCS certification — you need an MCS install to claim SEG export payments.
- Check the installer's public liability insurance yourself and confirm it is in date.
- Get the panel and inverter make and model in writing, plus their product and performance warranties.
- Confirm the quote includes scaffolding, DNO notification and the MCS certificate — not as later extras.
- Ask for a realistic annual generation estimate for your roof orientation, not a best-case figure.
- Get three quotes on the same system size and spec so the numbers are comparable.
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FAQs
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Related guides
- Solar panels cost (full UK guide)
- How much does a solar battery cost in 2026?
- How to choose a solar installer
- How to get a solar panel grant in 2026
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