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Last updated October 2026.
Why industrial roofs suit solar
Large, unshaded industrial roofs and steady daytime loads make many warehouses and factories strong candidates. The deciding questions are whether the roof structure can take the extra load, how much life the covering has left, what the grid connection allows and, for tenants, whether the landlord will agree. Sizing to daytime demand matters most.
A distribution shed or factory has what solar needs: a large, unshaded, lightly used roof and a daytime electrical load underneath it. Lighting, conveyors, compressors, refrigeration and chargers run while the sun is up, so a well-sized system is consumed on site rather than exported. That combination is why industrial buildings are often stronger candidates for solar than offices or shops.
The constraints are equally specific. Many portal-frame roofs were designed to the minimum structural load and need checking before panels go on. Industrial estates often sit on network infrastructure with limited spare export capacity. And a large share of sheds are leased, which means the landlord’s consent and a workable arrangement for who owns the system and who benefits.
The checks that decide it
| Check | What matters | Typical outcome |
|---|---|---|
| Structure | Roof purlin and frame capacity for an extra 12–20 kg/m²; condition and remaining life of the roof covering | Many post-1990 sheds can take a system; older or lightweight roofs may need strengthening or a lighter mounting |
| Roof life | A roof with less than 15 years left will need replacing with the panels in place | Replace the roof first, or use a system designed to be lifted off |
| Grid connection | Export capacity available at the site’s connection; cost and timescale of any upgrade | Often the binding constraint on size; a battery or export limiter can avoid an upgrade |
| Load profile | Half-hourly consumption through the day, week and year | Sets the size at which self-consumption stays high |
| Tenure | Lease length, landlord consent, alterations clause, who owns the system at lease end | Owner-occupiers can proceed directly. Tenants need the landlord’s agreement whoever owns the system |
Talk it through with us
Send us a recent bill or a quick description of your sites and we will tell you plainly what applies to you and what it would involve. No obligation.
Sizing to the building
The instinct is to fill the roof. The economics usually say otherwise. A 1,000 kWp system on a shed with a 300 kW daytime load exports most of what it makes at a fraction of its value; a 400 kWp system on the same shed is consumed almost entirely and pays back years faster. The right size is the one that keeps self-consumption high through the working week, with the roof’s spare area left for a later phase if load grows.
Cold stores and sites with electric vehicle charging change the calculation, because their daytime load is higher and steadier, and sites that run shifts or weekends can carry larger systems. The ROI and payback page has the arithmetic; battery storage covers how storage lets a site carry a bigger system without the export penalty.
Frequently asked questions
Can any warehouse roof take solar panels?
Most post-1990 portal-frame sheds can, but the structure must be checked for the additional load and the roof covering must have enough life left. Older or lightweight roofs may need strengthening.
How big a solar system should a warehouse install?
One sized to keep self-consumption high through the working week, not one that fills the roof. The site’s half-hourly load profile sets the answer.
Can a tenant put solar on a leased warehouse?
With the landlord’s consent and an agreement covering ownership and what happens at lease end, or through a PPA structure where a provider owns the system.
What is the grid connection problem with industrial solar?
Many estates have limited spare export capacity. A large system may need a connection upgrade, which costs money and time; a battery or export limiter can avoid it.
How long does commercial solar take to pay back on a warehouse?
Often around five to seven years for a well-sized system on a site with steady daytime load, though it depends on unit rates and how much is exported. Capital allowances mainly help cash flow.
Does Clearsight Energy install solar?
No. We introduce vetted installer partners and help you compare their quotes, then set up your export tariff and fit your electricity contract around the panels. Installation is carried out by the installer.
Need help? Get in touch
Call us on 020 8036 5715, or email us, and we will take it from there.