Solar panels for a 3-bedroom house
A 3-bedroom UK house typically needs a 4 kWp solar system of around 10 panels, costing £6,000 to £8,000 fully installed in 2026. It generates roughly 3,000 to 3,800 kWh a year and saves about £350 to £700 on electricity, or £500 to £800 with a battery, giving a payback of around 8 to 10 years.
A 3-bedroom home uses about 3,500 kWh of electricity a year on average, which a 4 kWp system covers a large share of during daylight. Here is the typical cost, generation and saving.
Cost and savings at a glance
| Measure | Figure |
|---|---|
| System size | 4 kWp (about 10 panels) |
| Installed cost | £6,000 to £8,000 |
| Battery (optional) | £2,500 to £4,000 |
| Annual generation | ~3,000 to 3,800 kWh |
| Annual saving | £350 to £700 (more with a battery) |
| Payback | About 8 to 10 years |
What affects the figure for your home
- Roof direction: south is best, east and west still work well.
- Shading from trees, chimneys or neighbouring buildings.
- Your actual usage, which can be higher with an EV or heat pump.
- Whether you add a battery to store daytime generation for the evening.
Is it worth it for a 3-bed home?
For most owner-occupied 3-bedroom homes with a reasonable roof, solar is worth it. The payback sits comfortably inside the system's 25 year-plus life, and savings grow if electricity prices rise. The case is strongest if someone is home during the day or you add a battery.
Get your 3-bed estimate
Enter your postcode and bill in the SunSum calculator to see the exact system size, cost and saving for your 3-bedroom home.
Frequently asked questions
- How many solar panels for a 3-bedroom house?
- About 10 panels (a 4 kWp system) suit a typical 3-bedroom UK house, though higher usage may justify 13.
- How much do solar panels cost for a 3-bed house?
- Roughly £6,000 to £8,000 installed for the panels, plus £2,500 to £4,000 if you add a battery.
Related questions
Indicative estimates based on UK average data. Last updated 26 May 2026.