How much do solar panels cost for a 3-bed house UK?

Around £5,000–£8,000 for a typical 3.5kWp system installed, before finance. A battery adds roughly £2,000–£4,000.

Do solar panels work in the UK winter?

Yes, though output is lower. Annual generation still makes them worthwhile; a battery and high daytime usage improve winter self-sufficiency.

Can I get a loan for solar panels?

From September 2026 the Warm Homes Loan Scheme offers government-backed loans up to £15,000 for solar PV at reduced rates, via approved lenders.

Solar Panels for Your Home

Solar panels are one of the most accessible ways for a UK household to cut energy bills and carbon. Falling hardware costs, the Smart Export Guarantee (SEG) and new low-cost finance (the Warm Homes Loan Scheme) have made them more attractive than ever. This guide covers what a system costs, what it saves, the export tariff, and how to avoid rogue installers.

Last reviewed: August 2026Sources: Energy Saving Trust · GOV.UK — Smart Export Guarantee · MCS

What it costs in 2026

A typical 3.5kWp system (around 10 panels) costs roughly £5,000–£8,000 fully installed, before any finance or grant. Adding a battery (e.g. 5kWh) typically adds £2,000–£4,000. Costs vary with roof complexity, inverter choice and region. See our open benchmark dataset for current UK install-cost ranges.

What you save

Savings come from using your own generation (offsetting grid import) plus exporting surplus via the Smart Export Guarantee. A household with daytime occupancy or a battery keeps more of its generation, improving payback. High users and south-facing roofs do best; east/west splits are common and still effective. Bill savings are strongest when you shift load (dishwasher, EV charging, laundry) to daylight hours.

Smart Export Guarantee (SEG)

Under the SEG, licensed electricity suppliers pay you for surplus electricity exported to the grid. Rates vary by supplier (often 1p–15p/kWh); you need a smart meter and an MCS certificate to register. Shop around — the highest SEG rate materially improves payback.

Is it worth it — payback

For a typical home, simple payback is often around 8–12 years, shorter with high daytime usage, a battery, or a strong SEG rate. The Warm Homes Loan Scheme (from September 2026) offers loans up to £15,000 for solar PV and £15,000 for batteries at reduced rates, letting you spread the cost and repay from savings.

Choosing an installer

Use an MCS-certified installer — required for the SEG and for any government-backed finance. Check accreditation, guarantees (panel and workmanship), and whether they handle the DNO notification. Our guide to finding a trusted installer and the vetted installer directory can help you shortlist. Get at least three quotes and beware deposits far above industry norms.

FAQs

How much do solar panels cost for a 3-bed house UK?: Around £5,000–£8,000 for a typical 3.5kWp system installed, before finance. A battery adds roughly £2,000–£4,000.
Do solar panels work in the UK winter?: Yes, though output is lower. Annual generation still makes them worthwhile; a battery and high daytime usage improve winter self-sufficiency.
Can I get a loan for solar panels?: From September 2026 the Warm Homes Loan Scheme offers government-backed loans up to £15,000 for solar PV at reduced rates, via approved lenders.