Ground-Mounted Solar Panels for UK Factories — 2026 Guide
Ground-mounted solar PV for UK factory sites with adjacent land. System sizes, planning, capex per kW, payback — vs rooftop comparison.
When ground-mounted beats rooftop
Ground-mounted solar PV makes sense for UK factory sites with three characteristics: (1) adjacent owned or leasable land — typically rural manufacturing, food production, or distribution sites with paddocks, undeveloped land or under-used yard space; (2) roof unsuitable for retrofit — asbestos cement, listed building, or structurally compromised; (3) scale ambition above ~2 MW — ground-mount systems can scale to 5 MW+ with land area, where rooftops are usually capped by available area.
For 80% of UK factories on industrial estates, rooftop wins on planning, land use, and capex efficiency. Ground-mount becomes interesting at the edges — we model both routes for any client whose site has > 0.25 acres of land per 200 kW of intended PV.
Ground-mount vs rooftop — side-by-side
| Factor | Rooftop | Ground-mount |
|---|---|---|
| Capex per kW (turnkey) | £700–£900 | £800–£1,100 |
| Land use | Existing roof | ~3 acres per 1 MW |
| Planning route | Permitted Development | Full planning + landscape impact |
| Annual yield | ~950 kWh/kWp | ~1,050 kWh/kWp (optimal tilt) |
| G99 connection | Often via existing connection | Often new G99 connection required |
| Best for | 80% of UK factories | Land-rich rural sites, > 1 MW scale |
Real example: 1.8 MW ground-mount on a Norfolk food production site
A frozen vegetable processor in Norfolk has 9 acres of unused land adjacent to the main factory building. Demand profile: 24/7 refrigeration baseload, 6,800 MWh/year. We modelled both routes:
- Rooftop only: 850 kW maximum on the available 4,200 sqm of clear roof. Covers 32% of annual demand.
- Ground-mount only: 1.8 MW on 5.5 acres. Covers 64% of annual demand. Capex £1.6m.
- Combined: 850 kW roof + 1.5 MW ground = 2.35 MW. Covers 78% of annual demand. Capex £1.95m.
Client chose the combined route. Payback 4.2 years on capital purchase, 100% AIA on the first £1m + 50% FYA on the balance.
Ground-Mounted Solar Panels for UK Factories — FAQs
How much does this cost in the UK?
Mainstream Tier-1 commercial solar installs cost £700–£900 per kWp installed. See our cost guide for system-size breakdowns.
How long does the install take?
8–14 weeks from contract to commissioned system for systems up to 500 kW. The longest item is G99 grid connection (6–18 months DNO timeline) which we initiate before contract.
How is the system financed?
Four routes: capital purchase + AIA (best NPV), asset finance / lease-to-own (positive cash flow from month 1), PPA (zero capex), green business loan. See our financing guide.
How do I get a quote for my factory?
Submit a quote request with annual electricity spend and roof type. Free desk-based feasibility within 7 working days.
Get a free factory solar feasibility
Reply within one working day. Modelled against your real meter data, not industry averages.
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