How much do solar panels cost?
Solar panel cost depends on the system size (kWp) and whether you add battery storage. Get an indicative installed figure below.
What affects solar cost
- 1System size
Sized in kWp to your roof space and usage. A ~4 kWp system suits a typical family home.
- 2Battery or not
A battery stores daytime generation for evening use, improving self-consumption — but adds several thousand pounds.
- 3Roof and export
Roof orientation, shading and condition matter, and the network operator (DNO) may cap export — factor into the payback.
Solar is increasingly relevant as energy costs and EPC standards climb. If the roof needs work anyway, sequence the re-roof before the panels — retrofitting a roof under an existing array is expensive and avoidable.
Solar panel costs by system (indicative, fitted)
| System | Roughly | Indicative cost |
|---|---|---|
| Small (~3 kWp) | 8–10 panels | £4,500 – £7,000 |
| Standard (~4 kWp) | 10–12 panels | £5,000 – £8,500 |
| Large (~6 kWp) | 14–16 panels | £7,500 – £12,000 |
| Add battery storage | 5–10 kWh | +£3,000 – £6,000 |
Domestic solar currently benefits from 0% VAT. Scaffolding, DNO limits and roof condition affect the price.
Frequently asked questions
How much do solar panels cost to install?+
A standard ~4 kWp domestic system typically costs £5,000–£8,500 fitted (currently at 0% VAT). Adding battery storage adds roughly £3,000–£6,000. Larger systems cost more.
Are solar panels worth it?+
Payback typically runs around 8–12 years depending on usage, export rates and whether you add a battery — after which the electricity is largely free. They also improve the EPC, which matters for lettings.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.