Are Solar Panels Worth It in the UK? (2026 Data)

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

Solar panel prices have dropped dramatically. According to the Energy Saving Trust, a 4kW system - enough for a typical 3-bed house - now costs £5,000–£7,000 fully installed, including scaffolding, mounting, inverter, and connection. That's roughly half what it cost in 2020.

A larger 6kW system costs £7,000–£9,000. If you have the roof space and budget, bigger is usually better - the cost per kilowatt drops with larger systems, and any excess generation earns you money through the Smart Export Guarantee (SEG).

Battery storage adds £2,500–£5,000 on top. We'll cover whether that's worth it further down.

Solar panel savings per year in the UK

A 4kW system in southern England generates roughly 3,800–4,200 kWh of electricity per year. At the current electricity rate of about 24.5p/kWh, that's £930–£1,030 worth of electricity.

But you won't use all of it. Without a battery, a typical household uses about 40–50% of what the panels generate (the rest goes back to the grid during the day when you're out). That means your actual saving is more like £370–£515 per year from avoided electricity bills.

You also get paid for exporting excess electricity to the grid through the Smart Export Guarantee. Rates vary by supplier, but Octopus Energy currently pays around 15p/kWh for exports. That adds roughly £280–£380 per year for the electricity you don't use.

Total annual benefit without a battery: £650–£895. That puts the payback period at roughly 6–11 years for a 4kW system.

Solar panel output by UK region

The UK isn't exactly the Sahara, but some parts get significantly more sunshine than others. Here's how a 4kW system performs across the country.

Based on south-facing roof at 30–40 degree pitch, no shading, 2026 energy prices. East or west-facing roofs reduce output by roughly 15–20%.

Is battery storage worth the extra cost?

A battery lets you store the electricity your panels generate during the day and use it in the evening. Without one, that daytime electricity goes back to the grid at 15p/kWh when you could be using it instead of buying at 24.5p/kWh.

A typical home battery (5–10 kWh capacity) costs £2,500–£5,000 installed. It increases the proportion of solar electricity you use yourself from around 40–50% to 70–80%.

The maths: a battery saves you an extra £200–£350 per year in avoided electricity costs. At that rate, the battery alone takes 8–15 years to pay back. Since batteries have a warranty of 10 years and a lifespan of 10–15 years, the financial case is tight.

Batteries make more sense if you're on a time-of-use tariff (like Octopus Go), where you can charge the battery at 7.5p/kWh overnight and use that cheap electricity during peak hours. That changes the economics significantly.

When solar panels are not worth it in the UK

Solar isn't the right choice for every home. Be honest about these factors:

• North-facing roof. A north-facing roof generates 40–50% less than south-facing. The payback period doubles, and the financial case weakens significantly.
• Heavy shading. Trees, neighbouring buildings, or chimneys casting shade on your panels will dramatically reduce output. Even partial shading on one panel can affect the whole string.
• You're planning to move within 5 years. While solar panels do add value to a property, you're unlikely to recoup the full cost if you sell before the payback period.
• Your roof needs replacing soon. Don't install panels on a roof that needs work within 10 years. You'll have to pay to remove and reinstall them when the roof is done.
• You use very little electricity. If you're out all day and your annual electricity bill is under £500, the savings from solar may not justify the upfront cost.

Solar panels and heat pumps: the dream combo

If you have or are considering a heat pump, solar panels become even more attractive. A heat pump runs on electricity, and during spring and autumn - when the heat pump is doing moderate work and the panels are generating well - you're essentially heating your home for free.

The combination of solar panels, a battery, and a heat pump can reduce your energy bills by 60–80%. The upfront cost is significant (£15,000–£25,000 after grants), but the running cost savings are substantial and you're insulated against energy price rises.

What about the Smart Export Guarantee?

The SEG replaced the old Feed-in Tariff in 2020. As Ofgem explains, it requires electricity suppliers with 150,000+ customers to offer a tariff for exported solar electricity, but there's no minimum price.

Current rates range from 3p/kWh (the minimum offerings from some big suppliers) to 15p/kWh (Octopus Energy's agile export tariff). The difference is huge: on a 4kW system exporting 2,000 kWh per year, that's £60 vs £300.

Always shop around for the best SEG tariff. You don't have to export to the same company you buy from.

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