How Much Do Solar Panels Cost in the UK in 2026?

The single most common question we get at Eco First Group is: "How much will solar cost me?" Here's an honest 2026 breakdown for London and the Home Counties.

Typical system prices (fully installed, MCS certified)

• 3 kWp (6–8 panels) — around £5,500–£7,000. Suits small terraces and flats.
• 4 kWp (10 panels) — around £7,000–£8,500. The most popular UK domestic size.
• 6 kWp (14–16 panels) — around £9,500–£11,500. Detached homes and heavy users.
• 10 kWp+ — from £13,500. Larger properties, EV owners, heat pumps.

Battery storage

A 5 kWh battery adds around £3,500–£4,500 installed. A 10 kWh unit is £5,500–£7,500. Batteries transform payback because you use more of your own generation instead of exporting it cheaply.

What actually affects your quote

• Scaffold — height, access and duration.
• Roof type — slate, tile and flat roofs all need different mounting.
• Inverter choice — string, hybrid or micro-inverters.
• DNO application — anything above 3.68 kW single-phase needs approval before install.

Payback in 2026

With current electricity prices, a typical 4 kWp system with a 5 kWh battery pays back in 6–9 years and generates for 25+ years. VAT is still 0% on domestic installations.

Ready for a real number? Get a free no-obligation quote and we'll model your generation, savings and payback in writing.