Commercial Solar PV Installation

Commercial solar PV installation across every UK property type — design, planning, DNO, install, commissioning, monitoring.

Commercial Solar PV Installation — overview

Commercial solar PV installation across every UK property type — design, planning, DNO, install, commissioning, monitoring. Commercial Solar PV Installation is one of the most common requests across the UK commercial solar market, and the guides cover every UK property type — factories, warehouses, schools, hotels, hospitals, churches, farms, data centres, retail parks, offices, and SME businesses.

What a well-run project looks like

A well-run commercial solar PV installation follows a structured five-phase approach. Phase 1 is a desk-based feasibility from your half-hourly meter data and roof drawings, returning an indicative system size, generation forecast, payback model and recommended finance route — installers typically turn this round within a week. Phase 2, if the numbers work, is a 1-day on-site structural and electrical survey leading to a fixed-price proposal. Phase 3 covers permits, DNO connection application, structural sign-off, and grant paperwork. Phase 4 is on-site installation — 2 to 10 weeks depending on scale. Phase 5 is commissioning, monitoring activation, and the start of the 25-year output warranty.

Typical scope and economics

UK commercial projects in this category range from 30 kW systems on small office or retail sites through to 5 MW+ installations on warehouse, manufacturing, or multi-building campus sites. Capital cost per kW is £900–£1,200 for sub-100 kW, £750–£950 for 100–500 kW, and £700–£850 for systems above 500 kW. Most projects pay back in 4–9 years on capital purchase, with shorter paybacks for continuous-shift sites with high self-consumption and longer paybacks for weekday-only sites.

For a typical commercial site with 100,000 kWh annual demand at 22p/kWh grid retail, a 60–80 kW solar PV system offsets approximately 50% of daytime imports, generates around 60,000 kWh per year, saves £13,000–£15,000 per year on energy plus modest SEG export income, and pays back on capital purchase in 4–6 years.

Compliance and regulation

Every commercial solar project must hit the full UK regulatory stack: MCS contractor certification (with MCS-registered design sign-off), G99 grid connection agreement from the local DNO, BS 7671 18th Edition electrical compliance, full structural calculations to BS EN 1991 (where applicable), CDM 2015 principal designer and principal contractor coverage, and Building Regulations sign-off where required. Insist on a single accountable principal contract, so you carry no design or compliance risk.

Financing options

Three primary financing routes apply: capital purchase plus 100% Annual Investment Allowance (effectively 19–25% tax relief in year one); asset finance over 5–10 years (typically EBITDA-positive from month one); or Power Purchase Agreement (PPA) where the installer funds and owns the system and sells energy back at a fixed rate below grid retail. For public sector estates, the Public Sector Decarbonisation Scheme historically covered up to 100% of project cost, but it has had no open window since November 2024 — capital budgets, PWLB borrowing and PPAs are the live routes.

Sectors

The guides cover every UK commercial property type. Each sub-vertical has its own specialist site within the SEO Dons portfolio:

• Factories
• Warehouses
• Schools
• Hotels
• Hospitals
• Churches
• Farms
• Data centres
• SME businesses
• Offices
• Retail parks

Locations served

The guides cover every major UK city and county. See London, Birmingham, Manchester, and Leeds for some of the most active markets. Full county coverage at the technical guides hub.

Typical project timeline

From signed contract to commissioned, energised system, most UK commercial solar projects run 6–9 months: design and DNO application (4–6 weeks), procurement (4–6 weeks), on-site install (2–4 weeks for 100–300 kW systems), G99 connection (variable), and final commissioning (1 week). Larger projects above 500 kW or those requiring full planning permission can take 4–6 months end-to-end.