Solar panels for warehousing, FAQs
Honest answers to the questions our customers actually ask. Last updated for 2026.
How much do solar panels cost for a warehouse in 2026?
Budget roughly £850-£1,100 per kWp for systems around 100 kW, falling to about £700-£850 per kWp at 500 kW and £650-£850 per kWp at 1 MW as economies of scale kick in. In round numbers a 250 kW array is about £190,000-£220,000 and a 1 MW system roughly £700,000-£850,000. Solar qualifies for the £1m Annual Investment Allowance, so a profitable company writes most of it off against tax in year one. These are indicative planning figures, a fixed quote follows a roof and meter survey.
What size solar system can my warehouse take, and how is it sized?
As a planning rule, about 100-140 kWp fits per 1,000 sqm of usable clear-span roof, and only around 40-60% of a gross roof is usable once rooflights, plant and setbacks are removed. But roof area is rarely the real limit, we size from your consumption, not your roof. We pull twelve months of half-hourly meter data and design the array to match your daytime load (usually 60-85% of it), because a roof full of panels on a low-base-load shed just exports power at a loss.
Our daytime base-load is low, does solar still stack up?
Yes, if it's sized properly. Many ambient, single-shift warehouses have a modest daytime base-load, so the answer is a right-sized array (self-consuming 60-75% of generation) rather than a roof-fill. We then show how forklift/MHE charging and EV-van fleets can grow your daytime demand into more of the roof over time. Well-sized, even a low-load shed typically pays back in about 5-6 years.
Can we install solar on a warehouse we lease rather than own?
Yes. Tenant solar is now standard practice, it needs landlord consent, and most institutional landlords work to a standard green-lease addendum. We provide the template aligned with the BBP Green Lease Toolkit and engage the landlord for you. If your lease or contract is short, a Power Purchase Agreement puts a funder on the roof instead, so you get cheaper daytime power with no capex and clean end-of-lease treatment.
Will rooftop solar interfere with our sprinklers or affect our insurance?
No, when it's designed correctly. We work to LPC / RISCAuthority RC62 guidance on clearances from sprinkler heads and firewalls, DC isolation and rapid shutdown, and we obtain your insurer's pre-design sign-off before fabrication. The PV layout is built around your fire-protection and access routes, not the other way round.
What about the DNO and grid capacity for a large warehouse system?
Anything above a few hundred kW needs a G99 application, and we submit it early. We check your agreed import and export capacity first, and where the connection is tight we design for high self-consumption with export limitation (G100), and a battery if it helps, so you're not held up by network reinforcement. On systems over 1 MW we plan around 12-24 month DNO timelines and the post-2026 grid-queue reforms from the outset.
How does solar help our EPC rating and MEES compliance?
On-site solar is modelled through SBEM in the commercial EPC and typically lifts a warehouse one to three bands (indicative, not guaranteed, a fresh EPC must be lodged after install to capture it). The minimum EPC needed to let a commercial building is band E today. The government has confirmed an EPC B requirement for buildings over 1,000 sqm from 2031, but that is pending legislation, not yet law, and the widely-quoted 'EPC C by 2027 / B by 2030' pathway was dropped in June 2026. Solar is usually the biggest single EPC uplift per pound spent.
Are there grants or tax reliefs for warehouse solar?
The main lever is the £1m Annual Investment Allowance, which lets a profitable company deduct the whole capex from taxable profit in year one (note: full expensing does not apply to solar, and there is no 0% VAT for commercial, that's domestic-only; commercial VAT is 20% and reclaimable). On top of that: on-site solar and storage are exempt from business rates in England to 2035, the Smart Export Guarantee pays for surplus export, and units inside a designated Freeport or Investment Zone tax site can claim 100% Enhanced Capital Allowances on new plant. The old Industrial Energy Transformation Fund is closed to new applicants.
What is a Freeport Enhanced Capital Allowance and does our site qualify?
If your unit sits within a designated Freeport or Investment Zone special tax site, and you buy new, unused plant to use primarily there, you can claim 100% first-year Enhanced Capital Allowances. It applies only inside the specific designated sub-areas (not the whole freeport) and only to new equipment. English Freeport tax sites run to 30 September 2031, Scottish/Welsh and Investment Zone sites to 30 September 2034. We check eligibility for every applicable site.
Should we own the system or use a PPA?
Owning it (cash or asset finance) means you claim the tax allowances and keep every kWh of saving, best for owner-occupiers and longer tenures. A PPA needs no capex: a funder owns and maintains the system and you buy the power at a fixed rate below grid, off balance sheet, which suits tenants and 3PL operators on shorter contracts. We model cash, asset finance and PPA side by side with the numbers for each.
Can solar charge our forklifts and EV delivery vans?
Yes, and it's one of the best ways to raise self-consumption. Daytime forklift/MHE charging and opportunity-charging of EV vans absorb solar at close to 100% self-consumption. We design the charging infrastructure alongside the PV with dynamic load management so the combined draw stays within your grid connection, and we use the electrification of your fleet to grow the daytime load your array serves.
How much will network charges (TNUoS) rise, and how does solar help?
Transmission network charges (TNUoS) are set to rise around 60% in April 2026 and keep climbing through the decade, and they apply to every unit you import. Solar cuts your imported units directly, so it hedges not just the wholesale price but the fast-rising network element of your bill. For a high-daytime-use warehouse that's a permanent, compounding saving.
Can you install without shutting down our operation?
Yes. Roof installation happens above your operations, picking, put-away and despatch continue as normal. The only operational impact is the final grid connection (typically a few hours), which we schedule for a weekend or planned shutdown. We've delivered installs through peak season with no disruption to the floor.
What's the payback for a 3PL or short-lease operator specifically?
On a self-funded basis, a well-sized warehouse array pays back in roughly 3-6 years depending on how much of the generation you self-consume. But for 3PL and contract-logistics operators we more often structure a PPA or operating lease so the deal is cash-positive from day one with no capex, and written to fit your customer-contract term rather than a 25-year horizon.
We run a multi-let estate, how does solar work across several tenants?
Across a multi-let estate the question is who pays and who benefits. We design a private-wire or embedded-network arrangement, or a service-charge recovery model, so generation is allocated fairly across demised and shared supplies. Landlords use it to lift EPC ratings and protect lettability under MEES; tenants get cheaper daytime power. The metering and green-lease terms are agreed before install.
Does self-storage suit solar even with low on-site demand?
Self-storage sites have light on-site load but large, clean roofs, so the economics usually lean on export income (a competitive SEG tariff) or a landlord/common-area billing model rather than pure self-supply. It works best as a portfolio rollout across multiple similar sites for scale, and adding EV charging or a small battery improves the on-site use of what you generate.