Solar panels have dropped in price considerably over the past decade, but they are still a significant investment. Before you start getting quotes, it helps to know what a realistic number looks like and what drives the price up or down.
This guide gives you honest 2026 prices for solar panel installation in the UK, covering system sizes, labour, batteries, and what you will actually save on your electricity bill.
A 4 kWp solar panel system installed on a UK home costs £6,000 to £8,000 in 2026. Adding battery storage brings the total to £10,000 to £14,000. Most systems pay back in 8 to 12 years through lower bills and Smart Export Guarantee payments.
Solar Panel Costs by System Size
| System Size | Number of Panels | Installed Cost | Annual Generation |
|---|---|---|---|
| 2 kWp | 5 to 6 panels | £3,500 to £5,000 | 1,700 kWh |
| 3 kWp | 7 to 8 panels | £5,000 to £7,000 | 2,550 kWh |
| 4 kWp (most common) | 9 to 10 panels | £6,000 to £8,000 | 3,400 kWh |
| 5 kWp | 11 to 13 panels | £7,500 to £9,500 | 4,250 kWh |
| 6 kWp | 13 to 15 panels | £8,500 to £11,000 | 5,100 kWh |
Generation figures are UK averages based on south-facing panels at a 35-degree pitch. East or west-facing systems generate around 15% to 20% less. North-facing panels are not recommended.
Solar Panel Cost with Battery Storage
| System | Solar Only | With Battery | Battery Capacity |
|---|---|---|---|
| 3 kWp + battery | £5,000 to £7,000 | £8,000 to £11,500 | 5 to 10 kWh |
| 4 kWp + battery | £6,000 to £8,000 | £10,000 to £14,000 | 5 to 15 kWh |
| 5 kWp + battery | £7,500 to £9,500 | £11,500 to £16,000 | 10 to 15 kWh |
A battery stores electricity generated during the day so you can use it in the evening when solar output drops. Without a battery, surplus generation gets exported to the grid. Batteries make more financial sense if you are home during the day or have an electric vehicle to charge overnight.
Labour and Installation Costs
Labour for a standard roof-mounted solar installation runs £500 to £1,500 depending on complexity. Installers typically quote a single all-in price that bundles panels, inverter, mounting hardware, and labour together, so it is difficult to separate components in most quotes. If an installer gives you a quote that breaks out every component, compare the totals not the line items.
| Installation Type | Additional Cost | Notes |
|---|---|---|
| Standard pitched roof (south facing) | Included | The base case |
| Flat roof installation | £200 to £600 extra | Requires specialist mounting frames |
| Scaffolding (most jobs) | £400 to £800 | Usually included in the quote |
| Consumer unit upgrade | £500 to £900 | Only needed if existing unit is outdated |
| Tricky roof access | £300 to £600 extra | Steep pitch, limited access |
What Affects the Price
- Panel brand and quality: Budget panels from lesser known manufacturers are cheaper, but premium brands like SunPower, LG, and Panasonic offer higher efficiency and longer warranties. The difference between budget and premium panels can be £500 to £1,500 on a 4 kWp system.
- Inverter type: String inverters are the most common and cheapest. Microinverters cost more per panel but perform better in partial shade. Hybrid inverters that work with batteries cost £600 to £1,200 more than standard string inverters.
- Roof type: Standard interlocking tiles are the easiest to work with. Slate, flat roofs, and unusual roof pitches add cost and complexity.
- Location: London and the South East typically attract higher installation labour rates. However, the South also gets more sun, so the system generates more.
- Installer experience: MCS (Microgeneration Certification Scheme) accredited installers may quote slightly higher but are required for SEG payments and some warranty claims.
How Much Do Solar Panels Save?
Savings come from two sources: the electricity you do not have to buy from the grid, and the payments you receive for exporting surplus electricity through the Smart Export Guarantee (SEG).
| System Size | Annual Generation | Estimated Annual Saving | SEG Export Payment |
|---|---|---|---|
| 3 kWp | 2,550 kWh | £550 to £700 | £50 to £130/year |
| 4 kWp | 3,400 kWh | £750 to £950 | £70 to £170/year |
| 5 kWp | 4,250 kWh | £900 to £1,150 | £85 to £210/year |
These are estimates based on electricity at 25p per kWh and assuming around 40% of generated electricity is used on site. The more electricity you use during daylight hours, the higher your savings. Working from home, using a dishwasher and washing machine during the day, and charging an electric vehicle from solar all improve the economics.
Payback Period
Divide the installation cost by the annual savings and export income to estimate payback. A £7,000 system saving £850 per year takes around 8 years to pay back. Add a battery and the payback extends to 12 to 15 years, though you gain more energy independence and protection from future electricity price rises.
Solar panels typically carry a 25-year performance warranty and last well beyond that. The payback period sits comfortably within the expected lifespan of the system, making it a reasonable long-term investment for homeowners who plan to stay in their property.
Grants and Financial Support
- Smart Export Guarantee (SEG): Energy suppliers must pay you for every unit of electricity you export to the grid. Rates vary by supplier, from around 2p to 20p per kWh. Octopus Agile and similar tariffs can significantly increase export income.
- Zero VAT: Solar panel installations are subject to 0% VAT, which saves around 20% compared to the pre-2022 rate. This applies to panels, batteries, and associated electrical work.
- ECO4 scheme: Low income households in certain property types may qualify for free solar panels through the Energy Company Obligation (ECO4) scheme. Contact your energy supplier or local council to check eligibility.
- Great British Insulation Scheme: A complementary scheme that may fund energy improvements alongside solar.
How Many Solar Panels Do You Need?
| Property Type | Annual Usage | Recommended System | Panels Needed |
|---|---|---|---|
| 1 bed flat | 1,500 kWh/year | 2 to 3 kWp | 5 to 7 |
| 2 to 3 bed house | 2,500 to 3,500 kWh/year | 3 to 4 kWp | 7 to 10 |
| 4 bed family home | 4,000 to 5,000 kWh/year | 4 to 5 kWp | 10 to 13 |
| Large home with EV | 6,000+ kWh/year | 6 kWp+ | 13 to 16+ |
Red Flags When Getting Solar Quotes
- Not MCS accredited: You must use an MCS accredited installer to qualify for SEG payments. Check the MCS installer database before signing anything.
- Unrealistic generation claims: If an installer claims a 4 kWp system will generate 6,000 kWh per year in the UK, walk away. Typical generation is 850 kWh per kWp installed.
- No site survey: A reputable installer will visit your property to check roof orientation, pitch, shading from trees or chimneys, and structural suitability before quoting.
- Pressure to sign quickly: Solar is not an impulse purchase. Get at least three quotes. Any installer applying high pressure tactics is a red flag.
- Unusually cheap quote: Budget panels with short warranties on a roof that will last 25 years creates a mismatch. Ask about panel brand, warranty, and inverter specifications before comparing prices.
Solar panel installation costs £6,000 to £8,000 for a typical 4 kWp system in 2026. Savings of £750 to £950 per year mean most systems pay back in 8 to 12 years. Get quotes from at least three MCS accredited installers, check the SEG rate before signing, and do not let anyone rush you into a decision. Also see our guide on boiler replacement costs if you are looking at wider home energy upgrades.
Frequently Asked Questions
How much does solar panel installation cost in the UK?
A typical 4 kWp solar panel system for a UK home costs £6,000 to £8,000 fully installed in 2026. A smaller 3 kWp system runs £5,000 to £7,000. A larger 6 kWp system with battery storage costs £10,000 to £14,000. Prices vary by panel brand, roof type, and installer.
How long does it take solar panels to pay for themselves in the UK?
Most UK solar panel systems pay back their cost in 8 to 12 years through reduced electricity bills and Smart Export Guarantee payments. Adding a battery can extend payback to 12 to 15 years but increases energy independence significantly.
How much do solar panels save on electricity bills?
A 4 kWp solar system generates around 3,400 kWh of electricity per year in the UK. At current electricity rates of around 25p per kWh, that represents a potential saving of £850 per year on bills, plus income from selling surplus electricity back to the grid through the SEG scheme.
Do I need planning permission to install solar panels?
Most domestic solar panel installations in England and Wales are permitted development and do not require planning permission, provided they do not protrude more than 200mm from the roof surface. Listed buildings, conservation areas, and some flat roofs may require permission.
Is there a government grant for solar panels in the UK?
There is no universal solar panel grant in the UK in 2026, but the Smart Export Guarantee pays you for surplus electricity exported to the grid. Low income households may qualify for free solar panels under ECO4. VAT on solar installations is 0%.
How many solar panels do I need for a 3 bed house?
A three bedroom house with average energy usage needs a 3 to 4 kWp solar system, which typically means 8 to 12 panels depending on the wattage of each panel. Standard residential panels are now 400W to 450W each, so a 4 kWp system needs roughly 9 to 10 panels.
How much does a solar battery cost in the UK?
A solar battery storage system costs £3,000 to £6,000 installed in the UK in 2026. Popular options include Tesla Powerwall, Givenergy, and Pylontech. Battery installation is VAT free at 0%.