As of May 2026, a typical solar panel system for a three-bedroom home in the UK usually costs between £6,500 and £9,000 fully installed. The final price will depend on the size of the system, the type of panels you choose, the complexity of your roof and the installer’s pricing. For many homes, that means a standard 4-5kW rooftop system costing roughly £6,500 to £8,000, while larger arrays, premium panels or more complex installations can push the price higher. Adding a solar battery increases the upfront cost, but can also change the long-term value of the system. The Energy Saving Trust puts the cost of a typical 5kWh battery at around £4,600, though prices can vary by brand, capacity and whether the battery is installed at the same time as the panels. A battery allows you to store more of the electricity your panels generate during the day and use it later, reducing how much power you need to buy from the grid.…