The UK solar market is experiencing its strongest sustained growth period since the Feed-in Tariff era. Residential installations hit record levels throughout 2025, driven by persistently high electricity prices, falling panel costs, and the 0% VAT incentive. But the commercial sector is where the real acceleration is happening.

Market Size and Installation Volumes

MCS-certified solar installations in the UK exceeded 170,000 in 2025, up from approximately 140,000 in 2024. The first quarter of 2026 shows no signs of slowing — January alone recorded over 15,000 installations, a 22% increase year-on-year.

The commercial sector is growing even faster. Business installations above 10 kWp increased by approximately 35% in 2025 as organisations accelerated net zero commitments and took advantage of capital allowances. Sectors showing the strongest growth include warehousing and logistics, education, and hospitality.

Price Trends

Panel hardware costs fell approximately 16% between 2023 and 2026, with the average cost of a 4 kWp residential system dropping from roughly £8,000 to £6,500-£7,500. However, labour costs have risen 8-10% over the same period due to installer demand outstripping supply. The net effect is a modest overall price reduction of 5-8%. For the latest detailed pricing, see The Cost of Solar.

Policy Landscape

Several policy developments are shaping the market in 2026:

  • 0% VAT extension — Confirmed until April 2027. This saves homeowners £1,000-£2,500 per installation. No confirmation yet of a further extension beyond April 2027, creating urgency for installations this year.
  • ECO4 closure — The scheme closes 31 March 2026, ending fully-funded installations for qualifying low-income households. ECO4 applications must be submitted before the deadline.
  • Warm Homes Plan — The government's flagship energy efficiency programme is rolling out 0% interest loans for solar and heat pump installations. This could significantly expand the addressable market.
  • ESOS Phase 4 — Qualification date of 31 December 2026. Large businesses subject to ESOS are increasingly choosing solar as a tangible action on their energy audit recommendations.

Supply Chain and Technology

Panel efficiency continues to improve. The mainstream residential panel now produces 400-430W, up from 350-380W two years ago. This means fewer panels per installation, reducing labour time and mounting costs. N-type TOPCon cells are replacing P-type PERC as the standard, offering 1-2% higher efficiency and better low-light performance.

Battery storage attachment rates are climbing sharply — approximately 40% of new residential installations now include a battery, up from 25% in 2024. GivEnergy and Tesla dominate the UK market, with Fox ESS and Sunsynk gaining share at the budget end.

Installer Market

The UK has approximately 3,500 MCS-certified solar installers, up from 2,800 in 2023. However, lead generation costs have risen significantly as competition intensifies. Solar installers increasingly rely on organic search and content marketing rather than paid advertising — a trend driven by the higher lifetime value of SEO-generated leads compared to PPC.

The most successful installers are those specialising in specific sectors: industrial solar, education, or commercial installations. Generalist installers face margin pressure from both ends — price competition from national chains and quality competition from specialists.