How much do solar panels cost in 2026?
Answer first: a typical UK solar panel system costs between £5,000 and £11,000 fully installed in 2026. A 4kW system, the common choice for a 3-bedroom home, is usually around £6,000–£8,000. Battery storage commonly adds £3,000–£6,500, depending on capacity and inverter setup.
Solar cost calculator
Use this quick estimator to choose a sensible starting system size. It is a guide only; roof pitch, shading, scaffolding, inverter choice and local installer pricing can move quotes up or down.
Here are the main 2026 price bands to compare before requesting quotes:
| System size | Panels | Installed cost | Typical fit |
|---|---|---|---|
| 3kW | 8–10 | £5,000–£6,500 | Flat, terrace or low use |
| 4kW | 10–13 | £6,000–£8,000 | Typical 3-bed home |
| 5kW | 13–16 | £7,000–£9,500 | Larger family home |
| 6kW | 16–19 | £8,000–£11,000 | High use, EV or heat pump |
These prices include panels, inverter, mounting hardware, wiring, scaffolding and installation by MCS-certified engineers. Solar panels are currently VAT-free in the UK (0% VAT), which can save a meaningful amount compared with the standard 20% VAT rate.
Best next step: compare a paid quote with the grant route first. Check solar panel grants, solar panels for EV charging and the eligibility checker before you commit.
Solar panel cost by home type
Home type is not the only sizing factor, but it is a useful shortcut when you are planning a first budget.
| Home type | Likely system | Solar-only budget | With common battery |
|---|---|---|---|
| Flat or small terrace | 2–3kW | £3,500–£6,500 | £6,500–£10,000 |
| Terraced house | 3kW | £5,000–£6,500 | £8,000–£11,000 |
| Semi-detached / 3-bed | 4kW | £6,000–£8,000 | £9,000–£12,500 |
| Detached / high-use home | 5–6kW | £7,000–£11,000 | £11,500–£17,500 |
Solar panel cost by number of panels
Many homeowners search by number of panels rather than system size. Here's how cost breaks down both ways in 2026:
| No. of Panels | Approx System Size | Installed Cost | Annual Generation |
|---|---|---|---|
| 6 panels | 2kW | £3,500–£5,000 | ~1,700 kWh |
| 8–10 panels | 3kW | £5,000–£6,500 | ~2,600 kWh |
| 10–13 panels | 4kW | £6,000–£8,000 | ~3,400 kWh |
| 13–16 panels | 5kW | £7,000–£9,500 | ~4,200 kWh |
| 16–19 panels | 6kW | £8,000–£11,000 | ~5,100 kWh |
| 20+ panels | 7–8kW | £10,000–£14,000 | ~6,000+ kWh |
A 10-panel system typically costs £6,000–£8,000 installed and covers the electricity needs of an average 3-bedroom UK home. A 16-panel system (around 5kW) costs £7,000–£9,500 and is well-suited to larger households or homes with an EV charger. A 20-panel system costs £10,000–£13,000 and generates enough electricity to run a large home plus charge an electric vehicle year-round.
Which size is right for you? As a rule of thumb, multiply your annual electricity usage (kWh) by 0.25 to get the minimum system size in kW. The average UK home uses 3,500 kWh/year, so a 4kW (10–13 panel) system is the most popular choice.
What affects solar panel cost?
Panel quality and brand
Premium panels (e.g., SunPower, LG, REC) cost 20-30% more than budget options but offer higher efficiency (21-23% vs 18-20%), longer warranties (25 years vs 15), and better performance in low light. For most homeowners, mid-range panels from established brands like JA Solar, Trina, or Canadian Solar offer the best value.
Roof type and access
Standard pitched roofs are cheapest to install on. Flat roofs need additional mounting frames (add £500-£1,000). Complex roofs with dormers, skylights, or multiple levels increase scaffolding costs. Slate or tile roofs are standard; if you have a thatched roof, solar may not be suitable.
Inverter choice
String inverters (£500-£1,000) are the standard choice. Micro-inverters (£800-£1,500) cost more but optimise each panel individually — worth it if your roof has partial shading. Hybrid inverters (£1,000-£2,000) are required if you want to add battery storage.
Location
Installation costs vary by region. London and the South East tend to be 10-15% more expensive than the North of England. However, southern locations also generate more solar electricity (around 10% more than Scotland), so the payback period is similar across the UK.
Battery storage costs
| Battery Size | Cost (installed) | Stores | Added Savings/Year |
|---|---|---|---|
| 3.6kWh | £2,500–£3,500 | Half a day's electricity | £200–£300 |
| 5kWh | £3,000–£4,500 | Most of a day's electricity | £300–£400 |
| 9.5kWh | £4,500–£6,500 | Full day's electricity | £400–£550 |
| 13.5kWh (Tesla Powerwall) | £6,000–£8,500 | More than a day | £500–£650 |
Without a battery, you'll use about 40% of the solar electricity you generate and export the rest to the grid. With a battery, self-consumption rises to 70-80%, significantly increasing your savings. Batteries also let you charge overnight on cheap off-peak tariffs and use that electricity during peak hours.
Typical payback period for a 5kW solar system with battery: many UK homes should model around 7-11 years in 2026. A 5kW system is often £7,000-£9,500 without a battery, while a 5-10kWh battery can add roughly £3,000-£6,500. Payback improves when you use more electricity in the evening, charge an EV at home, or use off-peak tariffs intelligently.
Are solar panels worth it in 2026?
For many UK homeowners, solar is still worth considering in 2026 because 0% VAT reduces upfront cost, electricity prices remain high by historic standards, and SEG export tariffs add a second return stream. Payback is strongest when you use more electricity during the day, have an unshaded roof, or can shift usage to solar hours.
Solar panel savings and payback period
| System | Bill saving guide | SEG guide | Payback guide | Best fit |
|---|---|---|---|---|
| 3kW (no battery) | £500–£700/yr | £80–£180/yr | 7–9 years | Lower-use homes |
| 4kW (no battery) | £650–£900/yr | £100–£240/yr | 6–8 years | Typical 3-bed homes |
| 4kW + 5kWh battery | £850–£1,150/yr | Usually lower | 7–10 years | Evening electricity use |
| 5kW + 5-10kWh battery | £950–£1,350/yr | Tariff dependent | 7–11 years | Family homes, EV-ready homes |
| 6kW + 9.5kWh battery | £1,100–£1,600/yr | Tariff dependent | 7–11 years | EV, heat pump or high use |
These figures are planning ranges, not guarantees. Your result depends on your import tariff, export tariff, daytime usage, roof orientation, shading, system cost and whether a battery is charged from solar or cheap off-peak electricity.
Smart Export Guarantee (SEG)
The Smart Export Guarantee requires energy suppliers with 150,000+ customers to offer a tariff for exported solar electricity. Current rates vary from 4p to 15p per kWh:
- Octopus Energy — up to 15p/kWh (fixed export)
- British Gas — 5.6p/kWh
- E.ON Next — 4.1p/kWh
- EDF — 5.5p/kWh
- Agile Export (Octopus) — variable, 1-35p/kWh
Choosing the right SEG tariff can make a significant difference to your returns. Octopus Agile Export is particularly attractive if you have a battery and can export during peak-price evening hours.
Solar panels and electric vehicles
If you have or plan to get an electric vehicle, solar panels can become more valuable because you have a useful place to send daytime generation. The best result usually comes from pairing panels with a smart charger, sensible charge scheduling and, for some homes, a battery. Read the full solar panels and EV charging guide before sizing a system around a car.
Do solar panels need planning permission?
In most cases, no. Solar panels on domestic roofs are classified as permitted development provided they don't protrude more than 200mm from the roof surface and aren't higher than the highest part of the roof. Exceptions include listed buildings, conservation areas, and some flats. Your installer will advise on any permissions needed.
How to get the best price
- Get 3+ quotes — Prices vary significantly between installers. We can match you with MCS-certified installers in your area.
- Compare like for like — Ensure all quotes use similar panel brands and include the same equipment.
- Check MCS certification — Required for SEG eligibility and warranty protection.
- Time your purchase — Spring installations can be 5-10% cheaper as it's the quiet season for installers.
- Consider financing — Many installers offer 0% finance over 3-5 years, spreading the cost with no interest.
Before you pay for solar: If you receive qualifying benefits — or your home has a poor EPC — ECO4 may cover solar panels or insulation first, and 0% VAT still applies to paid installs.