Cost of Solar Panels for a 3-Bedroom House
The short answer
A typical 3-bedroom UK house needs a 4kW system (~10 panels) costing £6,000–£8,000 installed at 0% VAT (June 2026), generating ~3,400 kWh a year and saving £500–£800 annually — more with a battery.
The 3-bed semi is Britain's default solar install, which makes its numbers the best-benchmarked in the market.
What you actually get for the money
The £6,000–£8,000 band covers the standard 3-bed job end-to-end: ~10 mid-tier panels (430–450W each), a hybrid or string inverter, mounting, scaffolding, an MCS-certified installation and the paperwork that unlocks Smart Export Guarantee payments (0% VAT applies until 31 March 2027). Where a quote lands within the band comes down to scaffolding complexity, panel tier and your region — the same drivers explained in our full guide to the cost of solar panels in the UK.
The three configurations worth pricing
| Setup | Installed cost | Output | Typical saving |
|---|---|---|---|
| 4kW panels only (typical) | £6,000–£8,000 | ~3,400 kWh/yr | £500–£800/yr |
| 4kW + 10kWh battery | £10,000–£13,000 | ~3,400 kWh/yr | £800–£1,100/yr |
| 5kW (larger roof/usage) | £7,500–£9,800 | ~4,250 kWh/yr | £600–£950/yr |
Savings and payback, honestly
A 3-bed household using 2,700–3,500 kWh a year typically consumes 40–60% of its solar generation directly. At ~25–26p/kWh import prices that self-use, plus export income on the surplus, is where the £500–£800 annual saving comes from — a 7–10 year payback against a 25–30 year system life. A battery lifts the saving into the £800–£1,100 range but adds £4,000–£5,000; whether that trade works for your usage is exactly what the free battery payback calculator and solar cost calculator are for. For the equivalent numbers on other house sizes, see cost by property type and the full 4kW system guide. For quotes, MCS-certified regional installers such as a South Coast solar installer or a Midlands installer price against these ranges; buying a new-build instead? See solar on new-build homes.
Frequently asked questions
How much do solar panels cost for a 3-bedroom house in the UK?
Typically £6,000–£8,000 installed at 0% VAT (June 2026) for the 4kW, ~10-panel system most 3-bed houses need. Adding a battery takes the total to roughly £10,000–£13,000.
How many solar panels does a 3-bedroom house need?
Usually about 10 panels (a 4kW system) — enough to generate ~3,400 kWh a year, close to the typical 3-bed household consumption of 2,700–3,500 kWh. Bigger roofs and higher usage can justify 12–14 panels.
How much will solar save on a 3-bed house electricity bill?
Typically £500–£800 a year without a battery (using roughly half the generation directly and exporting the rest via the SEG), or £800–£1,100 with a battery and a time-of-use tariff. Payback usually lands in 7–10 years without a battery.
Is a battery worth it for a 3-bedroom house?
If evenings are your peak usage and you can access a cheap overnight tariff, usually yes over the long term — but it adds £4,000–£5,000, so run the payback maths first rather than defaulting to it.