The short answer
To put solar on a warehouse you need an installer with a track record on large roofs: MCS-certified, able to run a structural survey and a G99 grid application, and willing to phase the work around your operations. Warehouse systems typically run 100 kWp to over 1 MWp at £700–£1,000 per kWp, with some of the fastest payback in commercial solar — 2–5 years.
Warehouse and distribution roofs are the single biggest piece of untapped solar in the UK — large, simple, unshaded planes above operations that run all day. That makes them an excellent fit, but it also means the install is a different job from a small commercial roof: bigger systems, structural sign-off, a heavier grid application and work at height over a live site. The installer you choose matters more than the panels they fit. We are independent — we don't install anything — so this is a neutral guide to getting it right, and a route to a vetted installer when you want one.
What makes installing solar on a warehouse different?
Most of what separates a good warehouse install from a poor one comes down to scale and the building itself:
- Size — warehouse arrays are typically 100 kWp to 1 MWp+, an order of magnitude larger than a typical commercial roof, with the grid application and project management to match.
- Structure — panels add a distributed load to a steel portal frame and its purlins; this needs a structural survey, not an assumption.
- Roof condition — membrane age, fragile rooflights and any asbestos-cement sheeting drive both safety and cost, and sometimes a re-roof first.
- Grid — a large exporting system needs a G99 application and often a flexible (export-limited) connection where local capacity is tight.
- Operations — the work happens over a live site, so access, crane positions and phasing around shifts have to be planned, not improvised.
What to look for in a warehouse solar installer
The vetting bar is higher than for a small roof. These are the checks that matter most at warehouse scale:
| What to check | Why it matters for a warehouse |
|---|---|
| Large-roof track record (100 kWp–1 MWp+) | A firm that fits domestic and small commercial systems is not the same as one that delivers megawatt-scale roofs |
| In-house or partnered structural survey | Distributed loads on a steel portal frame need professional sign-off before anything is fitted |
| G99 / DNO experience at scale | Large export needs a G99 application and often a flexible connection — experience here protects your timeline |
| Working-at-height and fragile-roof competence | Rooflights and ageing membranes are the main safety and cost risks on a warehouse roof |
| Phased install around operations | Logistics sites can't stop; the installer should plan access and shifts around you |
| Written O&M and monitoring | A 250 kWp+ asset needs real maintenance and performance monitoring, not fit-and-forget |
The same fundamentals apply as for any commercial installer — certification, insurance, references — which we set out in full in our guide to choosing a commercial solar installer.
How much does warehouse solar cost to install?
Warehouse systems benefit from economies of scale, so the cost per kWp is at the lower end of the commercial range — around £700–£1,000 per kWp installed:
| System size | Typical installed cost | Indicative payback |
|---|---|---|
| 100 kWp | £80,000–£95,000 | 2–5 years |
| 250 kWp | £190,000–£230,000 | 2–5 years |
| 500 kWp | £375,000–£425,000 | 2–5 years |
Payback is fast because a warehouse uses most of what it generates during the working day. For the full cost breakdown see our commercial solar cost guide, and for the return on investment by building type our payback and ROI guide.
Getting a warehouse solar quote
A quote you can actually compare must spell out more than a headline price. For a warehouse, make sure it states:
- System size in kWp and the predicted first-year yield (P50, in kWh)
- A structural assessment of the roof, or the cost of one
- Who handles the DNO / G99 application, and the assumed export limit
- Roof access, scaffolding and crane costs, and the phasing plan
- Panel and inverter make, warranties, and ongoing O&M terms
Compare quotes on cost-per-kWp and projected payback, never on the headline figure. Our quote-comparison checklist walks through every line.
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Do you need planning permission for warehouse solar?
Usually not. Since December 2023, permitted development rights cover rooftop solar of any size on commercial buildings in England — the previous 1 MW cap was removed — so even a large warehouse array typically does not need full planning permission. Systems over 50 kW may need prior approval from the local planning authority, and listed buildings or conservation areas remain exceptions. Building regulations always apply. Full detail is on our planning permission guide.
Get matched with a vetted warehouse installer
Frequently asked questions
How do I find a good warehouse solar installer?+
Look for an installer with a real track record on large roofs — systems of 100 kWp up to 1 MWp or more — that is MCS-certified, can run its own structural survey, has handled G99 grid applications at scale, and puts maintenance terms in writing. Ask to visit a comparable site. We match qualifying businesses with a vetted warehouse installer for a free survey.
How much does it cost to install solar on a warehouse?+
At warehouse scale, expect roughly £700–£1,000 per kWp installed — less per unit than a small commercial roof. A 250 kWp array runs about £190,000–£230,000 and a 500 kWp system £375,000–£425,000. Warehouses also see some of the fastest payback in commercial solar, typically 2–5 years, because daytime operations use most of what the roof generates.
How long does warehouse solar installation take?+
The panels themselves go up in a few weeks even on a large roof. The calendar is driven by the grid: a G99 application for a large exporting system takes around 8–12 weeks to approve. End to end — survey, design, DNO approval, install, commissioning — a warehouse project usually runs 5–9 months. Starting the grid application early is the single biggest thing that shortens it.
Will installation disrupt warehouse operations?+
Usually very little. Rooftop work happens above the operating floor, so racking, picking and despatch generally carry on. Good installers phase the work around your shifts and plan roof access and crane positions to avoid yard congestion. For 24/7 logistics sites, agree the access plan and any short isolation windows with the installer before work starts.
Can my warehouse roof structurally take solar panels?+
Most modern steel portal-frame warehouse roofs can carry a solar array, which adds a modest, well-distributed load. A structural survey confirms it for your specific building, checking the frame, purlins and roof covering. Older or lightweight roofs, fragile rooflights, and any asbestos-cement covering need particular care — an asbestos roof usually has to be replaced before panels go on.
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Updated June 2026 · By Taro Schenker, founder of Business Solar Check. We're independent — we don't install solar. Figures are indicative UK averages; your site survey confirms the numbers for your roof.