Solar Panel Cost

Solar panel costs in the UK have fallen by around 40% since 2020, making 2026 one of the most financially attractive years yet to install. Prices have now largely stabilised, which means the steep year-on-year drops of the past are unlikely to continue — and with 0% VAT on residential solar confirmed until March 2027, there’s a strong case for getting your system in sooner rather than later.

The exact cost of a solar panel system depends on several factors: system size, panel brand, inverter type, roof complexity, and regional labour rates. Here’s a straightforward breakdown of what most UK homeowners are paying in 2026:

A 3kW solar system — ideal for a 1–2 bedroom home or a small flat — typically costs between £5,000 and £6,500 fully installed. It generates around 2,700 kWh per year and saves roughly £450–£600 annually on electricity bills. A good starting point for smaller properties with more modest energy needs.

A 4kW solar system is the most popular size for a 3-bedroom semi-detached in the UK, costing around £6,500–£8,500 installed. With an annual output of 3,400–3,800 kWh, homeowners typically save £550–£900 per year. This size also pairs particularly well with home battery storage for evening use.

A 6kW solar system suits larger four- or five-bedroom properties with higher energy consumption, running £8,000–£11,000 installed. Annual savings can reach £900–£1,200 or more, especially when combined with a battery and a time-of-use electricity tariff.

All prices above include 0% VAT, saving every UK homeowner roughly £1,000–£2,000 on a typical install compared to the standard 20% rate. Payback periods range from 6 to 10 years depending on usage, export rates, and battery inclusion. After payback, you generate essentially free electricity for the remaining lifespan of your system.

At SolarBriton, we help you compare quotes from MCS-certified installers so you get genuine value for your investment.