Commercial Solar Cost UK — What Businesses Actually Pay
Real 2026 installed prices from £650 to £1,100 per kWp, broken down by system size, sector and funding route. Fixed-price quotes modelled from your half-hourly meter data.
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Commercial solar cost in the UK: the honest 2026 picture
Commercial solar cost UK searches return a mess of outdated figures, so here is the current position. In 2026, a fully installed commercial rooftop system costs between £650 and £1,100 per kWp depending on size, roof type and grid connection. That means a 30kW array for a small workshop lands at roughly £27,000–£33,000, while a 500kW system across a distribution centre roof comes in between £325,000 and £400,000. Per-kWp pricing falls steadily as systems grow, because the fixed costs of a project — design, scaffolding, the DNO application, site mobilisation — get spread across more generating capacity.
Those bands assume a straightforward trapezoidal steel roof in reasonable condition. Flat membrane roofs, standing seam, fragile sheeting, restricted access or a constrained grid connection can each push a project up by 5–20%. We cover every one of those variables, with numbers, in the price factors guide.
Two more things the listicle sites rarely tell you. First, commercial installations are standard-rated for VAT at 20% — the widely advertised 0% rate is domestic-only and runs until March 2027. Second, the tax relief is generous: the Annual Investment Allowance lets most businesses deduct the full system cost from taxable profits in year one, and companies past the £1 million AIA cap can use the 50% first-year allowance for special-rate assets such as solar. The net effective cost after tax relief is often 19–25% lower than the invoice price.
2026 installed prices by system size
Fully installed, including scaffolding, G99 application and commissioning. Click any size for the full breakdown.
| System size | Installed cost | £ per kWp | Annual output* | Typical payback |
|---|---|---|---|---|
| 30kW | £27,000–£33,000 | £900–£1,100 | 25,500–28,500 kWh | 5–7 years |
| 50kW | £44,000–£53,000 | £880–£1,060 | 42,500–47,500 kWh | 5–7 years |
| 100kW | £80,000–£95,000 | £800–£950 | 85,000–95,000 kWh | 4–6 years |
| 250kW | £175,000–£215,000 | £700–£860 | 212,500–237,500 kWh | 4–6 years |
| 500kW | £325,000–£400,000 | £650–£800 | 425,000–475,000 kWh | 4–5 years |
*Based on 850–950 kWh per kWp per year for a south-to-east/west facing UK rooftop. Yield varies with orientation, pitch and shading.
Why 2026 pricing favours the buyer
What a quoted price should include
The single biggest cause of disappointing projects is quotes that are not comparing the same scope. A complete commercial solar price includes panels and inverters, the mounting system matched to your roof construction, DC stringing and AC connection work, scaffolding or powered access, the G99 application to your district network operator, structural engineer sign-off, commissioning, an MCS certificate where applicable, and a monitoring platform you can actually use.
Items that commonly appear as exclusions — and quietly add £5,000–£40,000 to real project cost — are DNO reinforcement charges, roof repairs discovered at survey, export limitation devices, LV panel upgrades, and out-of-hours working where a site cannot host installers during production. A fixed-price proposal built from a proper survey shifts that risk to the installer, which is exactly where it belongs.
Cost by sector is a different question
A hotel, a cold-store and an office block with the same roof area justify very different systems, because what matters is the load profile under the roof. Our cost-by-sector guide covers typical sizing and spend for manufacturing, warehousing, offices, hospitality, agriculture and retail. If you would rather start from budget instead of building type, the finance vs purchase comparison shows what £0-capex routes really cost over a contract term.
From meter data to a fixed price in four steps
No sales visit, no pressure — a desk-built price first, then a survey only if the numbers work for you.
- 01Day 1
Share half-hourly data
You send your half-hourly meter data (or recent bills) and roof drawings or address. That is enough to model consumption against generation properly.
- 02Day 2–7
Desk feasibility
We model system size, yield, self-consumption and payback, and return an indicative price band built from current 2026 rates — not last year’s.
- 03Week 2–4
Survey and fixed price
If the indicative numbers work, a structural and electrical survey converts the band into a single fixed price with a named exclusions list.
- 04Week 4
Decision-ready proposal
You get the yield model, the fixed price, funding comparisons and the DNO position in one document your board or lender can interrogate.
Commercial solar cost — quick answers
Longer answers, with worked examples, live on the FAQs page.
How much does commercial solar cost in the UK in 2026?
Between £650 and £1,100 per kWp installed, depending almost entirely on system size. A 30kW system for a small commercial unit costs roughly £27,000–£33,000; a 500kW system for a distribution centre costs £325,000–£400,000. The per-kWp rate falls as systems get larger because scaffolding, design, DNO applications and mobilisation are spread over more panels.
What is included in a typical commercial solar quote?
A properly built fixed-price quote covers panels, inverters, mounting, DC and AC cabling, scaffolding or access equipment, the G99 grid application, structural sign-off, commissioning, monitoring, and handover documentation. If any of those items are listed as exclusions, the headline price is not comparable with one that includes them — always check the exclusions list first.
Do businesses pay VAT on commercial solar?
Yes — commercial installations are standard-rated at 20%. The 0% VAT rate that runs until March 2027 applies to domestic installations only. For VAT-registered businesses this is usually neutral, because the VAT is recoverable as input tax in the normal way.
How fast does a commercial solar system pay for itself?
Most UK commercial systems sized against daytime load reach simple payback in 4–7 years. The two biggest drivers are your unit rate for grid electricity and your self-consumption percentage — a site using 80%+ of generation on-site paybacks far faster than one exporting half of it at SEG or PPA export rates.
Can the cost be written off against tax?
Largely, yes. Most businesses can claim the Annual Investment Allowance, which gives a 100% first-year deduction on qualifying plant and machinery spend up to £1 million — enough to cover the full cost of most commercial rooftop systems. Companies that have used up their AIA can claim the 50% first-year allowance on special-rate assets, which includes solar panels.
Is it cheaper to wait for panel prices to fall further?
Panel prices have already fallen a long way and hardware is now only around a third of project cost. Labour, scaffolding, electrical work and grid fees are not falling. Meanwhile every year of waiting is a year of full-price grid electricity — for a 100kW system displacing power at 25p/kWh, that is roughly £20,000 of savings forgone per year.
Regional notes: does location change the price?
Less than buyers expect. Hardware, design and grid fees are national; what varies regionally is labour, access logistics and — at the margins — yield. London and the South East carry a 5–15% delivery premium driven by access costs and congestion, partially offset by the highest commercial electricity rates in the country. Northern industrial cities price at or slightly below the national bands quoted here, with excellent installer availability around the big-shed corridors. Scotland sees marginally lower yields (typically 800–880 kWh per kWp) balanced by competitive labour rates; the South West gets the best irradiance in Britain at standard pricing. In every region, the £/kWp curve by system size dominates the postcode effect — a 250kW system in Glasgow beats a 50kW system in Cornwall on unit economics every time.
Timing matters more than geography. Installer order books fill from spring; winter programmes carry weather contingency that estimators price in. Projects that complete desk feasibility in Q1 and contract by early summer routinely commission the same year — and start their payback clock at the year's best generation months. The 2026 pricing in this guide is maintained against live tender data, so the bands above are the ones to negotiate from regardless of where your roof sits.
How to use this site
Start with the page that matches your roof. The 30kW and 50kW guides suit small industrial units, garages, farm shops and village-scale commercial premises. The 100kW guide covers the most common mid-size commercial install in the UK. The 250kW and 500kW guides deal with manufacturing plants and big-shed logistics, where DNO engineering starts to shape the price as much as the hardware does.
Then sanity-check against the nine factors that move commercial solar pricing, and decide how to pay for it using the funding comparison. When you want a number you can take to a board meeting, the quote form takes about two minutes — and the first pass needs no site visit at all. The cost of commercial solar in the UK has never been easier to pin down before speaking to a single salesperson.