Commercial Solar Panel Costs in the UK
Commercial solar panels cost £750-£1,000 per kWp installed in the UK, or £550-£800 per kWp for larger industrial systems. That works out at £15,000-£20,000 for a small 20 kWp business system and £60,000-£85,000 for a 100 kWp rooftop. This guide breaks down commercial solar installation costs by system size, what drives the price up or down, and how tax relief changes the real cost.
Quick Answer
Commercial solar panels cost £750-£1,000 per kWp installed in the UK. A 50 kWp system costs £34,000-£47,000 and saves £10,000-£15,000 a year on electricity, paying back in 5-7 years. Businesses can write off 100% of the cost against tax through the Annual Investment Allowance, and VAT-registered businesses reclaim the 20% VAT.
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Commercial solar panel costs by system size
The single biggest factor in commercial solar panel cost is system size. Cost per kWp falls as systems get bigger because fixed costs (scaffolding, design, grid application, commissioning) are spread over more panels.
| System Size | Typical Building | Installed Cost (est.) | Cost per kWp | Annual Generation |
|---|---|---|---|---|
| 10 kWp | Small shop or office | £9,000-£12,000 | £900-£1,200 | ~9,500 kWh |
| 20 kWp | Restaurant, surgery, small unit | £15,000-£20,000 | £750-£1,000 | ~19,000 kWh |
| 50 kWp | Mid-size office or workshop | £34,000-£47,000 | £680-£940 | ~47,500 kWh |
| 100 kWp | Warehouse or factory | £60,000-£85,000 | £600-£850 | ~95,000 kWh |
| 200 kWp | Large warehouse, distribution | £110,000-£153,000 | £550-£765 | ~190,000 kWh |
| 500 kWp | Industrial site or farm | £255,000-£340,000 | £510-£680 | ~475,000 kWh |
Estimates based on UK market rates in 2026, excluding VAT. Generation assumes an average UK yield of 950 kWh per kWp. Actual quotes vary with roof type, access and grid connection requirements.
What affects commercial solar installation cost?
Roof type and condition
Trapezoidal metal roofs are the cheapest to fit. Flat roofs need ballasted mounting frames, which add £50-£100 per kWp. Fragile roofs (asbestos cement, old fibre cement) may need replacement first, and slate or tile adds labour time.
Grid connection (G99)
Systems above 16A per phase need a G99 application to your DNO. Most approvals are straightforward, but if local grid capacity is constrained you may face export limits or reinforcement charges that change the project economics.
Access and scaffolding
Single-storey industrial units with good access are cheap to scaffold. Multi-storey buildings, restricted sites and town-centre locations push installation costs up.
Panel and inverter choice
Premium N-type panels from Aiko or Jinko cost more per watt than standard modules but yield more per square metre. String inverters are standard; adding optimisers or microinverters for shaded roofs increases cost.
Battery storage
Adding commercial solar battery storage typically adds £400-£700 per kWh of capacity, but raises self-consumption and can cut peak-rate charges.
Structural surveys
Commercial arrays are heavy (12-20 kg/m² plus wind loading), so most projects need a structural engineer's sign-off. Budget £500-£2,000 depending on building size.
Tax relief and VAT on commercial solar
The headline commercial solar panel cost is not the real cost. Businesses can claim 100% of the installation against taxable profits in year one through the Annual Investment Allowance, worth 25% of the project cost to a company paying the main rate of corporation tax. VAT is charged at 20% but is reclaimable for VAT-registered businesses. A £40,000 (ex-VAT) 50 kWp system can therefore have an effective cost of around £30,000.
For the full breakdown with worked examples, the special rate rules and the business rates exemption, see our guide to capital allowances and tax benefits on commercial solar and our wider solar panels and tax guide.
Commercial solar costs vs savings: typical payback
At commercial electricity rates of 25-30p/kWh, every kWp installed saves roughly £190-£280 a year when most generation is used on site. Typical payback is 5-7 years, with 25-30 years of generation after that. Surplus electricity earns export income through the Smart Export Guarantee, though self-consumption pays 3-5x more than exporting.
| System Size | Installed Cost (est.) | Annual Saving (est.) | Simple Payback |
|---|---|---|---|
| 20 kWp | £15,000-£20,000 | £4,000-£5,500 | 4-5 years |
| 50 kWp | £34,000-£47,000 | £10,000-£15,000 | 3-5 years |
| 100 kWp | £60,000-£85,000 | £20,000-£30,000 | 3-4 years |
Savings assume 70-90% self-consumption at 25-30p/kWh. Businesses with low daytime use (e.g. evening-only hospitality) will see longer paybacks unless they add battery storage.
Commercial solar cost FAQ
How much do commercial solar panels cost in the UK?
Commercial solar panels cost £750-£1,000 per kWp installed in the UK. A 20 kWp system costs £15,000-£20,000, a 50 kWp system £34,000-£47,000, and a 100 kWp system £60,000-£85,000. Larger systems cost less per kWp thanks to economies of scale, and the Annual Investment Allowance lets businesses write off 100% of the cost against tax in year one.
What is included in a commercial solar installation cost?
A quoted commercial solar installation cost normally includes the panels, inverters, mounting system, scaffolding or access equipment, electrical work, the G99 grid connection application, commissioning, and MCS or equivalent certification. Structural surveys, roof repairs, battery storage and monitoring upgrades are usually priced separately.
How much does a 100kW commercial solar system cost?
A 100 kWp commercial solar system costs £60,000-£85,000 installed in the UK. It generates roughly 95,000 kWh a year, which saves £20,000-£30,000 annually for a business paying commercial electricity rates, giving a typical payback of 5-7 years before tax relief is applied.
How long does commercial solar take to pay back its cost?
Commercial solar typically pays back its installation cost in 5-7 years, and as little as 3-4 years for businesses with high daytime electricity use. After payback the panels keep generating for 25-30 years, delivering a 10-15% annual return over the system's life.
Can businesses claim back the VAT on commercial solar panels?
VAT-registered businesses can normally reclaim the 20% VAT charged on a commercial solar installation in full, so the effective cost is the ex-VAT price. Unlike domestic installations, commercial solar is not zero-rated, so non-VAT-registered organisations pay the full 20%.
How much do industrial solar panels cost?
Industrial-scale solar for factories and warehouses costs £550-£800 per kWp for systems above 200 kWp, falling as size increases. A 500 kWp industrial rooftop system costs £255,000-£340,000 installed and generates around 475,000 kWh a year.
Related guides
- Commercial solar panels UK: the complete guide
- How to find a commercial solar installer
- Commercial solar battery storage
- Capital allowances and tax benefits on commercial solar
- Commercial solar panel grants and funding
- 100kW solar system cost UK
- Domestic solar panel costs UK
- Industrial solar panels UK
- Solar panels for farms
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.
Sources
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