Panels only, fully installed (3–6kWp)
4kWp system, no battery
Adds ~£3,000–£6,500
kWp, panel quality and storage capacity
How much does solar panels cost in 2026?
Prices below are fully installed and include 0% VAT (in place until 31 March 2027). System size is measured in kWp — roughly the peak output in good sun. A typical 3-bed UK home fits a 4kWp system of about 10 panels on the roof.
| System size | Typical 2026 range | Notes |
|---|---|---|
| 3kWp (~7–8 panels) | £5,000–£6,500 | Suits a small home or low usage |
| 4kWp (~10 panels) | £6,000–£8,000 | Most common size for a 3-bed home |
| 5kWp (~12–13 panels) | £7,000–£9,500 | Larger family home or high usage |
| 6kWp (~15 panels) | £8,000–£11,000 | Big roof, EV or heat pump household |
| Battery add-on (5kWh) | £2,500–£4,500 | Stores daytime power for evening use |
| Battery add-on (10kWh) | £4,500–£7,500 | Larger storage, near-off-grid in summer |
| 4kWp + 5kWh battery | £9,000–£11,500 | Popular complete package |
| 6kWp + 10kWh battery | £12,000–£16,000 | Maximum self-consumption setup |
What affects the cost
Several factors move a solar quote up or down. The biggest is simply how big a system you fit.
- System size (kWp): more panels means more cost but a lower price per panel.
- Battery storage: the single biggest add-on, typically £2,500–£7,500 depending on capacity.
- Panel and inverter quality: premium brands and hybrid inverters cost more but last longer and perform better.
- Roof type and access: slate, flat roofs, scaffolding needs and high or awkward roofs add labour.
- Electrical work: a fuse-board upgrade, bird protection or extra cable runs can push the price up.
Cost breakdown: where the money goes
On a typical £7,000 4kWp install, roughly half the cost is hardware (panels, inverter, mounting) and the rest covers labour, scaffolding, design, certification and the installer's margin.
- Panels: around £1,800–£3,000 for a 4kWp set.
- Inverter: £800–£1,800 (more for a hybrid that supports a battery).
- Mounting and cabling: £500–£1,000.
- Scaffolding and labour: £1,500–£2,500, usually a one- to two-day job.
- Design, paperwork and MCS certification: built into the price but essential for SEG.
0% VAT and the Smart Export Guarantee
Two things make solar more attractive in 2026. First, 0% VAT on solar panels, batteries and the installation labour applies until 31 March 2027, saving roughly £1,000–£3,000 versus the old 5% rate. After that it is due to revert to 5% unless extended.
Second, the Smart Export Guarantee (SEG) pays you for surplus electricity you export to the grid. Rates currently range from about 4p to 15p per kWh, with the best fixed tariffs (such as Octopus Outgoing, OVO and E.ON Next) near 15p. To claim SEG you need a smart meter and an MCS-certified installation — without MCS, no supplier will accept your application.
Is it worth it? Savings and payback
A 4kWp system generates roughly 3,400 kWh a year in the UK. At the 2026 price cap of around 24.5p/kWh, that translates into about £500–£800 a year in combined bill savings and SEG export payments — more if you add a battery and shift more usage to your own power.
Payback is typically 7–11 years for panels alone, stretching to 9–13 years with a battery. Panels are warranted for 25 years, so most homes enjoy a decade or more of near-free electricity after payback. The economics are strongest for homes with high daytime use, an EV or a heat pump.
Do you need a battery?
A battery is not essential, but it raises how much of your own solar you actually use — from around 40–50% up to 70–80%. That means bigger bill savings, especially if you are out during the day.
The trade-off is cost and a longer payback. If your budget is tight, fitting panels now with a hybrid inverter lets you add a battery later as prices fall. If you are home in the day or want resilience during outages, a battery makes more sense from the start.
Common extras and hidden costs
Watch for items that may not be in a headline price.
- Scaffolding on tall or awkward properties.
- Fuse-board (consumer unit) upgrade if yours is old.
- Bird or pigeon mesh to protect panels.
- Roof repairs if tiles are damaged or the roof is near end of life.
- EV charger or hot-water diverter add-ons to soak up surplus power.
Regional price differences (2026)
Prices vary modestly across the UK, driven mainly by labour and scaffolding rates rather than the kit itself. London and the South East sit at the top end.
| Region | Typical 2026 range |
|---|---|
| London | £6,500–£12,000 |
| South East | £6,000–£11,000 |
| Midlands | £5,500–£10,000 |
| North of England | £5,000–£9,500 |
| Scotland & Wales | £5,000–£10,000 |
Cost estimator
Estimate a rough installed cost based on system size, battery choice and roof complexity.
This estimate is a budgeting tool, not a quote. Real prices vary — get local quotes for an accurate figure.
Get real quotesHow to save money
- Get at least three MCS-certified quotes and compare like-for-like on panel and inverter brand.
- Make sure 0% VAT is applied — it runs until 31 March 2027 and saves £1,000–£3,000.
- Right-size the system to your usage; oversizing without a battery just exports cheap power.
- Fit a hybrid inverter now so you can add a battery later without replacing it.
- Shop around for the best SEG export tariff once installed — rates range from 4p to 15p per kWh.
- Avoid high-pressure 'today only' sales offers; reputable installers don't need them.
- Use a hot-water diverter or schedule appliances for daytime to use more of your own power.
- Check for any local council or energy-company grants before you buy.
How long it takes
- Survey and quote: a home or remote roof assessment, usually within a week or two.
- Design and paperwork: system design, DNO notification and scheduling — 2–4 weeks.
- Installation: most home systems are fitted in 1–2 days.
- Commissioning and MCS certificate: same day or shortly after, needed for SEG.
- SEG registration: apply to a supplier once you have your MCS certificate and smart meter.
What's usually included
- Solar panels, mounting system and inverter
- Installation labour and basic scaffolding
- DNO (grid) notification and electrical connection
- MCS certificate and system handover documents
- Manufacturer and workmanship warranties
What's usually extra
- Battery storage (priced separately as an add-on)
- Consumer unit / fuse-board upgrades if required
- Roof repairs or reinforcement
- EV charger or hot-water diverter
- Smart meter installation (arranged via your energy supplier)
How to choose the right solar installers
Choose an installer certified under the Microgeneration Certification Scheme (MCS) — it is essential, because you cannot register for SEG export payments without an MCS-certified install. Look for RECC or HIES membership too for added consumer protection.
- Are you MCS-certified, and will I receive an MCS certificate? (Required for SEG.)
- Are you a member of RECC or HIES for consumer protection?
- Can you provide local references or recent installs I can see?
- Is the quote itemised, with panel and inverter make and model named?
- Is 0% VAT applied to the whole job?
- What warranties cover the panels, inverter and your workmanship?
- Will you handle the DNO notification and all paperwork?
- Is scaffolding and any fuse-board upgrade included or extra?
Solar panels cost FAQs
How much do solar panels cost in the UK in 2026?
A typical home system costs £5,000–£11,000 fully installed (3–6kWp), with 0% VAT applied. Adding a battery brings most complete packages to £9,000–£16,000.
How much does a 4kW solar system cost?
Around £6,000–£8,000 installed for panels only. With a 5kWh battery, expect roughly £9,000–£11,500. A 4kWp setup of about 10 panels suits most three-bed homes.
Do I pay VAT on solar panels?
No. Solar panels, batteries and the installation labour carry 0% VAT until 31 March 2027, saving roughly £1,000–£3,000. After that it is due to revert to 5% unless extended.
What is the Smart Export Guarantee (SEG)?
SEG pays you for surplus electricity you export to the grid, currently 4p–15p per kWh. You need a smart meter and an MCS-certified installation to qualify, and you choose which supplier's tariff to use.
Why does MCS certification matter?
Only an MCS-certified installation can be registered for SEG payments — no supplier will accept an application without it. It also proves the install meets recognised quality standards, so always use an MCS-certified installer.
What is the payback period on solar panels?
Typically 7–11 years for panels alone and 9–13 years with a battery. As panels are warranted for 25 years, most homes get a decade or more of near-free electricity afterwards.
How much can I save a year with solar?
A 4kWp system saves roughly £500–£800 a year through lower bills and SEG payments. Adding a battery and using more of your own power increases that further.
Do I need a battery with my solar panels?
No, but a battery raises self-use from around 40–50% to 70–80%, boosting savings — useful if you are out during the day. You can fit a hybrid inverter now and add a battery later.
Do solar panels need planning permission?
Usually not — most roof installs are permitted development. Listed buildings, conservation areas and flat-roof or ground-mounted systems may need permission, so check with your council.
How long does installation take?
Most home systems are fitted in one to two days. From quote to commissioning, allow a few weeks for design, DNO notification and scheduling.