How Much Does Solar Cost

A standard 4kWp solar system fully installed in the UK typically costs £7,000–£9,000. A 6kWp system runs £9,500–£12,000. Adding a 10kWh battery brings the total to £13,000–£17,000 depending on battery brand and system complexity.

What VAT applies?

Residential solar installations in England, Scotland, and Wales have been zero-rated for VAT since April 2022. This removed the 5% rate that previously applied, saving £350–£600 on a typical installation. Zero-rating also applies to battery storage installed alongside panels.

What drives price variation?

• System size — the main driver; more panels, more cost
• Roof complexity — multiple pitches, limited access, or difficult cable runs add labour time
• Scaffolding — typically £300–£600, should be included in the quote
• Inverter type — hybrid inverters (needed for battery-ready systems) cost more than standard string inverters
• Panel brand — premium panels carry a higher cost per panel; mid-tier panels from established manufacturers offer strong long-term value at lower cost

What a quote should include

A complete quote should itemise panels, inverter, mounting system, cabling, installation labour, scaffolding, DNO application where required, and the MCS certificate. Be cautious of quotes that exclude scaffolding — the cost has to appear somewhere.

Can I get it cheaper?

Probably. There are cheaper installers. Some cut costs on panel quality, skip MCS accreditation (which you need for SEG export payments), or use labour without fully qualified electricians. The system is on your roof for 25 years. The upfront price difference between a properly installed system and a cheap one is typically £500–£1,500. The consequences of a poor installation can cost multiples of that.