Commercial Solar Panels in the UK
UK businesses can now install solar PV systems up to 1MWp and claim 100% tax relief through the Annual Investment Allowance (AIA), significantly reducing the net cost.
With electricity prices remaining high, business solar panels deliver a typical payback of 5–7 years and a 10–15% annual ROI. From small offices to warehouses and farms, solar panels for business in the UK are now the fastest way to cut energy costs.
Last updated March 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Quick Answer
Commercial solar panels in the UK cost £12,000–£210,000 depending on system size, with 100% tax relief available through the Annual Investment Allowance (AIA). A typical 50 kWp business system costs £34,000–£47,000, saves £10,000–£15,000/year on electricity, and pays for itself in 5–7 years with a 10–15% annual ROI.
What are commercial solar panels?
Commercial solar panels are larger-scale solar PV systems designed for businesses, farms, schools, community buildings, and public sector organisations. While residential systems are typically 3–6 kWp (8–14 panels), commercial systems range from 10 kWp to 1,000 kWp (1 MWp), covering significantly more roof or ground space and generating far more electricity.
The technology is identical to residential solar PV: photovoltaic cells convert sunlight into DC electricity, an inverter converts it to AC, and the business uses it on-site. Surplus can be exported to the grid for income. The key difference is scale: a 50 kWp system on a warehouse roof generates approximately 43,000–48,000 kWh per year, enough to offset a significant portion of a business’s electricity consumption.
Small Business
10–30 kWp systems for offices, shops, and small workshops. 25–70 panels on an existing roof.
Medium Business
30–200 kWp for warehouses, factories, hotels, and large retail. Flat roofs are ideal for ballasted mounting.
Large / Agricultural
200–1,000 kWp for large farms, data centres, and industrial sites. May include ground-mounted arrays. See our farm solar guide for Farming Equipment and Technology Fund (FETF) grants and farm-specific sizing.
What tax relief is available for commercial solar?
UK businesses can claim significant tax relief on commercial solar PV installations. The Annual Investment Allowance (AIA) allows 100% of the cost to be deducted from taxable profits in the year of purchase, up to £1,000,000. This effectively reduces the net cost by your marginal corporation tax rate.
| Tax Relief | Benefit | Details |
|---|---|---|
| Annual Investment Allowance (AIA) | 100% first-year deduction | Up to £1,000,000 per year on qualifying plant & machinery |
| Enhanced Capital Allowances | 100% first-year deduction | Available for energy-saving technologies including solar PV |
| Corporation tax saving | 25% of system cost | At the main 25% corporation tax rate |
| VAT recovery | 20% of system cost | VAT-registered businesses can reclaim the 20% VAT |
| Smart Export Guarantee (SEG) | Export income | Earn 3–15p/kWh for surplus electricity exported to the grid |
Who can claim tax relief?
- Businesses and commercial operations
- Agricultural operations and farms
- Public sector bodies
- Schools and community buildings
- Non-profit organisations
Solar PV qualifies as plant and machinery for capital allowance purposes. Speak with your accountant to confirm eligibility for AIA or Enhanced Capital Allowances.
MCS certification
To qualify for the Smart Export Guarantee (SEG) and ensure compliance, your installation must be carried out by an MCS-certified installer. MCS certification is also often required for finance and insurance purposes.
How much do commercial solar panels cost in the UK?
Commercial solar panels in the UK cost £750–£1,000 per kWp installed, or £15,000 to £340,000 depending on system size. A 50 kWp system costs £34,000–£47,000 before tax relief, and significantly less after AIA deductions. Larger systems benefit from lower costs per kWp due to economies of scale.
| System Size | Gross Cost (est.) | AIA Tax Relief (25%) | Effective Cost (est.) | Annual Generation |
|---|---|---|---|---|
| 20 kWp | £15,000–£20,000 | £3,750–£5,000 | £11,250–£15,000 | ~19,000 kWh |
| 50 kWp | £34,000–£47,000 | £8,500–£11,750 | £25,500–£35,250 | ~47,500 kWh |
| 100 kWp | £60,000–£85,000 | £15,000–£21,250 | £45,000–£63,750 | ~95,000 kWh |
| 200 kWp | £110,000–£153,000 | £27,500–£38,250 | £82,500–£114,750 | ~190,000 kWh |
| 500 kWp | £255,000–£340,000 | £63,750–£85,000 | £191,250–£255,000 | ~475,000 kWh |
Costs are estimates based on UK market rates in 2026. Actual costs vary by installer, roof type, and project complexity. VAT at 20% applies to commercial installations (reclaimable for VAT-registered businesses). Generation estimates assume average UK solar yield of 950 kWh/kWp.
What is the ROI on commercial solar in the UK?
Commercial solar in the UK delivers a typical annual ROI of 10–15% with a payback period of 5–7 years. A system can reduce electricity bills by 30–50%, and surplus electricity earns 3–15p/kWh through the Smart Export Guarantee (SEG). Businesses with high daytime electricity use see the best returns.
| Metric | Typical Range |
|---|---|
| Payback period | 5–7 years |
| Annual ROI | 10–15% |
| System lifespan | 25–30 years |
| Electricity cost savings | 30–50% of electricity bill |
| Export income (surplus) | 3–15p/kWh (Smart Export Guarantee) |
| Carbon reduction | ~0.3 tonnes CO2 per MWh generated |
Tax benefits
Commercial solar qualifies for the Annual Investment Allowance (AIA) and Enhanced Capital Allowances, allowing businesses to write off 100% of the cost against corporation tax in the first year. Combined with VAT recovery, the effective cost is significantly reduced.
Battery storage
Battery storage systems can be paired with commercial solar to store excess generation for use during peak-rate hours. This increases self-consumption and reduces reliance on grid electricity, further improving ROI. Battery costs also qualify for capital allowances.
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Get a Quote ↓What size solar system does my business need?
Most UK businesses install commercial solar systems between 20 and 200 kWp. A small office or shop typically needs 10–20 kWp (25–50 panels), a warehouse or factory needs 50–200 kWp, and large industrial sites can go up to 1,000 kWp. System size depends on electricity consumption, roof area, and budget.
| Business Type | Typical System | Panels | Roof Area |
|---|---|---|---|
| Small office / shop | 10–20 kWp | 25–50 | 50–100 m² |
| Restaurant / hotel | 20–50 kWp | 50–125 | 100–250 m² |
| Warehouse / factory | 50–200 kWp | 125–500 | 250–1,000 m² |
| Farm (dairy / tillage) | 30–100 kWp | 75–250 | 150–500 m² |
| School / community | 20–50 kWp | 50–125 | 100–250 m² |
| Large industrial / data centre | 200–1,000 kWp | 500–2,500 | 1,000–5,000 m² |
Rule of thumb: 1 kWp requires approximately 4–5 m² of roof space and generates ~950 kWh/year in the UK.
Do commercial solar panels need planning permission?
Roof-mounted commercial solar panels in the UK are generally permitted development for non-domestic buildings, provided panels do not protrude more than 200mm from the roof surface and do not extend above the ridgeline. Ground-mounted systems and installations on listed buildings always require planning permission.
| Installation Type | Planning Required? | Conditions |
|---|---|---|
| Roof-mounted (industrial) | Permitted development | Must not protrude more than 200mm from roof or extend above ridgeline |
| Roof-mounted (business park) | Permitted development | Same conditions as industrial |
| Ground-mounted | Yes, typically required | Some agricultural exemptions for small arrays |
| Listed buildings | Yes, always required | Listed building consent also needed |
Large systems
If your system falls outside permitted development rights, your installer should handle the planning application as part of the project. Commercial planning applications typically take 8–12 weeks. Check with your local planning authority for specific requirements in your area.
How do you get commercial solar installed?
To get commercial solar installed: choose an MCS-certified installer, arrange a site survey, apply to your DNO (Distribution Network Operator) for grid connection under G98/G99, then proceed with installation. The full process takes 2–4 months from first enquiry to generating electricity.
Choose an MCS-certified commercial installer
Select a company from the MCS certified installer register at mcscertified.com. Get at least 2–3 quotes. The installer will conduct a site survey, review your electricity bills, and recommend a system size.
DNO application (G98/G99)
Your installer applies to your DNO (Distribution Network Operator) for grid connection approval. Systems up to 16A per phase use the simpler G98 notification; larger systems require a G99 application which takes 4–10 weeks.
Installation
Once DNO approval is received, installation proceeds. A 50 kWp system typically takes 3–5 days. Larger systems may take 1–3 weeks.
Commissioning and MCS certificate
Your installer commissions the system, installs monitoring, and issues your MCS certificate. This certificate is required to register for the Smart Export Guarantee (SEG).
Register for Smart Export Guarantee
Sign up with a SEG-licensed energy supplier to receive payment for surplus electricity exported to the grid. Your MCS certificate is required for registration.
Important: use an MCS-certified installer
Only installations by MCS-certified installers qualify for the Smart Export Guarantee. MCS certification also provides consumer protection and is often required by insurers and lenders.
Commercial Solar Panels FAQ
How much can a business save with solar panels in the UK?
A typical commercial solar installation saves 30–50% on electricity bills. A 50 kWp system generating ~47,500 kWh/year can save £10,000–£15,000 annually at current commercial electricity rates (28p/kWh+). Additional income comes from exporting surplus at 3–15p/kWh through the Smart Export Guarantee (SEG).
What tax relief is available for commercial solar in the UK?
UK businesses can claim 100% tax relief on solar PV through the Annual Investment Allowance (AIA), up to £1,000,000 per year. Enhanced Capital Allowances are also available for energy-saving technologies. At the 25% corporation tax rate, this effectively reduces the system cost by 25%. Farms may also access the Farming Equipment and Technology Fund (FETF) — see our dedicated farm solar guide for full details.
Is there VAT on commercial solar panels in the UK?
Yes, commercial solar installations are subject to 20% VAT (residential installations qualify for 0% VAT). However, VAT-registered businesses can reclaim the VAT through their normal VAT returns, making it effectively cost-neutral.
Can I install solar on a leased building?
Yes, but you need written consent from your landlord. The business occupying the building and benefiting from the electricity generation typically arranges the installation. Ensure the lease terms cover the expected lifespan of the system.
How long does a commercial solar installation take in the UK?
The installation itself takes 3–5 days for a typical 50 kWp system, or 1–3 weeks for larger systems. The full process, from initial enquiry to generating electricity, takes 2–4 months including DNO (Distribution Network Operator) grid connection approval under G98/G99.
Do commercial solar panels work on flat roofs?
Yes. Flat roofs are actually ideal for commercial solar. Panels are mounted on ballasted frames at an optimal angle (30–35 degrees) without needing to drill into the roof membrane. This is the most common setup for warehouses, factories, and retail buildings in the UK.
What is the Annual Investment Allowance for solar?
The Annual Investment Allowance (AIA) allows businesses to deduct 100% of the cost of qualifying plant and machinery, including solar PV, from taxable profits in the year of purchase, up to £1,000,000. This significantly improves the first-year ROI compared to claiming capital allowances over multiple years.
Can I sell excess electricity from commercial solar?
Yes. Under the Smart Export Guarantee (SEG), businesses can sell surplus electricity to the grid at approximately 3–15p/kWh depending on your energy supplier and tariff. You need a smart meter, an MCS-certified installation, and a grid connection via your DNO. However, maximising self-consumption gives the best financial return.
Related Guides
Sources
- GOV.UK — Annual Investment Allowance (AIA)
- GOV.UK — Enhanced Capital Allowances for Energy-Saving Technologies
- Ofgem — Smart Export Guarantee (SEG)
- MCS — Certified Installer Register
Last updated: March 2026
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
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