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Commercial Solar Panels for UK Businesses: 2026 Costs, Tax Relief, Grants and Funding
Commercial solar panels turn an unused roof into your cheapest source of daytime electricity. This guide covers what a business installation costs in 2026, how capital allowances and the business rates exemption cut the real price, which grants are still open, and how to get quotes from vetted MCS-accredited installers.
Why commercial solar panels make sense for UK businesses in 2026
Businesses pay more for electricity than they did before the energy crisis, and there’s little sign of a return to old prices. Government figures (DESNZ Quarterly Energy Prices) put the average non-domestic electricity price at 24.14p per kWh in the first quarter of 2026, including the Climate Change Levy. That is about 60% above the 2021 average. The smallest business users paid an average of more than 34p. The Climate Change Levy itself rose to 0.801p per kWh on 1 April 2026, a cost households don’t pay.
Solar panels for business work especially well because of when companies use power. Offices, shops, warehouses, factories and schools draw most of their electricity between about 8am and 6pm, exactly when panels generate. A household with solar often uses only 40–60% of what its panels make; a busy commercial building frequently uses 70–90% on site. Every unit you use yourself replaces one you would otherwise buy at 20p–30p, while exported units usually earn only a few pence. That high self-consumption is the main reason business solar panels usually pay back faster than domestic systems.
Why business solar pays: demand and generation line up
There are wider benefits too. On-site generation fixes the cost of a slice of your electricity for 25 years or more, which helps with budgeting when wholesale prices swing. It gives you measurable Scope 2 emissions cuts for ESG reports and tenders, and it prepares your site for electric vans and staff EV charging. And because commercial solar panels UK-wide are far cheaper per kWp than they were a decade ago, the numbers now work on much smaller roofs than they used to.
How much do commercial solar panels cost in the UK?
The fairest way to compare a commercial solar panel price is the installed cost per kilowatt-peak (kWp), not the price per panel. Published 2026 price guides from UK commercial installers fall into three bands by system size, all quoted before VAT:
Commercial solar panel cost per kWp by system size (2026, ex-VAT)
Here’s how those bands translate into the typical cost of commercial solar panels for different buildings, including industrial solar panel prices for large roofs. As a rough rule, each kWp needs about 5–6 square metres of roof and produces around 850–950 kWh a year in most of England. Our own PVGIS modelling for Birmingham, for example, gives about 970 kWh per kWp on a south-facing 35° roof, while flat roofs laid east–west produce a little less.
| System size | Typical building | Roof area needed | Est. yearly output | Typical installed cost (ex-VAT) |
|---|---|---|---|---|
| 30kWp | Small office, shop, workshop | ~150–180 m² | ~27,000 kWh | £27,000–£36,000 |
| 50kWp | Retail unit, surgery, restaurant | ~250–300 m² | ~45,000 kWh | £45,000–£60,000 |
| 100kWp | Warehouse, secondary school, hotel | ~500–600 m² | ~90,000 kWh | £75,000–£95,000 |
| 250kWp | Manufacturing unit, large office | ~1,250–1,500 m² | ~225,000 kWh | £190,000–£240,000 |
| 500kWp+ | Factory, distribution centre | ~2,500–3,000 m² | ~450,000 kWh | £350,000–£425,000 |
Outputs assume about 900 kWh per kWp per year. Costs apply the size bands above; your quote will depend on the roof and the site’s electrical set-up.
What pushes a commercial solar quote up or down
- Roof type and condition. Flat roofs with ballasted frames avoid penetrating the membrane; profiled metal roofs on warehouses are usually quick to fix to. Old asbestos-cement sheets or roofs near the end of their life may need work first, and some fragile roofs need a structural survey.
- Access and safety. Edge protection, scaffolding, cranes and working-at-height controls are a bigger share of the cost on small or awkward roofs.
- Grid connection. Larger systems need your Distribution Network Operator’s approval before they connect. If the local network is constrained, you may face reinforcement costs or an export limit.
- Electrical works. Distance from the array to your main switchboard, three-phase upgrades and any new protection equipment all add cost.
- Equipment choice. Higher-efficiency panels, optimisers and premium inverters cost more per kWp but can raise output from a limited roof.
- Batteries. Adding storage raises the budget but lets you use more of your own generation. See our solar battery cost guide.
For a line-by-line look at where installation money goes, read our solar panel installation cost breakdown and our guide to solar inverter costs, since inverters are the part most likely to need replacing during a system’s life.
Commercial solar payback: three worked examples
So how much do solar panels cost for a business once savings are counted, and does the solar panel business case stack up? The table below models three typical buildings. It assumes 900 kWh per kWp a year, a business that pays the electricity price shown, and export earning 5p per kWh (business export tariffs are usually lower than the best domestic Smart Export Guarantee rates). The “after tax relief” column assumes the full cost is claimed through the Annual Investment Allowance by a company paying the 25% main rate of Corporation Tax.
| Example | Small office or shop | Warehouse or light industrial | Factory or distribution centre |
|---|---|---|---|
| System size | 30kWp | 100kWp | 500kWp |
| Installed cost (ex-VAT) | £33,000 (£1,100/kWp) | £85,000 (£850/kWp) | £375,000 (£750/kWp) |
| Yearly generation | 27,000 kWh | 90,000 kWh | 450,000 kWh |
| Share used on site | 70% | 80% | 85% |
| Electricity price avoided | 27p/kWh | 24.14p/kWh | 22p/kWh |
| Yearly bill saving | £5,103 | £17,381 | £84,150 |
| Yearly export income (5p) | £405 | £900 | £3,375 |
| Total yearly value | £5,508 | £18,281 | £87,525 |
| Simple payback before tax relief | 6.0 years | 4.6 years | 4.3 years |
| Corporation Tax saved via AIA (25%) | £8,250 | £21,250 | £93,750 |
| Payback after tax relief | 4.5 years | 3.5 years | 3.2 years |
Illustrative only. Electricity prices: DESNZ Quarterly Energy Prices, Q1 2026 non-domestic average (24.14p incl. CCL), with 27p used for a small business and 22p for a large negotiated contract. Costs from the 2026 size bands above. At the 19% small profits rate, the after-relief paybacks are 4.9, 3.8 and 3.5 years. Figures ignore panel degradation (about 0.5% a year), maintenance, inverter replacement, finance costs, and the fact that extra profit from lower bills is itself taxable.
Two things change these numbers most. First, how much of the output you use on site: a site that runs seven days a week or through the summer does better than one that closes at weekends. Second, your electricity contract: if you’re on a deemed or out-of-contract rate, each solar unit is worth more. Your installer should model your system from at least a year of half-hourly meter data, not a rule of thumb.
Capital allowances for solar panels: how the tax relief works
Solar panels capital allowances are one of the strongest parts of the business case, and one of the most often misquoted. HMRC classes all solar panels as special rate plant and machinery, and has done since April 2012. In practice, that gives a business three ways to claim.
| Relief | What it gives | Who can use it | Solar eligible? |
|---|---|---|---|
| Annual Investment Allowance (AIA) | 100% of the cost deducted from profits in the year of purchase, up to £1 million a year across all plant and machinery | Companies, sole traders and partnerships | Yes, usually the best option |
| 50% special rate first-year allowance | 50% deducted in year one, with the rest added to the special rate pool | Companies only, new and unused assets | Yes, useful once the AIA is used up |
| Special rate writing down allowance | 6% a year on a reducing balance | All businesses | Yes, the default for anything not claimed above |
| Full expensing | 100% for main rate assets | Companies | No, because solar is special rate |
| 40% first-year allowance (from 1 January 2026) | 40% for main rate assets | Companies and unincorporated businesses | No, main rate assets only |
How capital allowances on solar panels reduce a £100,000 project
Two common claims to be careful of. Relief doesn’t “give you back 25% of the cost” as cash: it reduces the profit you pay tax on, so the saving depends on your tax rate and profits. And the savings and export income that follow aren’t tax-free; lower bills raise your profit, which is taxed in the normal way. Ask your accountant how the AIA interacts with your other spending this year, whether timing the purchase before or after your year-end helps, and how relief works under a lease or hire-purchase agreement.
Business rates: rooftop solar is exempt in England until 2035
Before 2022, adding solar panels could raise a building’s rateable value. The Valuation for Rating (Plant and Machinery) (England) (Amendment) Regulations 2022 changed that: from 1 April 2022 to 31 March 2035, plant and machinery used for on-site renewable generation and storage, including rooftop solar and batteries, is exempt from business rates in England. On a large warehouse system that can be worth thousands of pounds a year. Wales, Scotland and Northern Ireland set their own rating rules, so check locally if your premises are there. If you think your solar has been wrongly added to your rateable value, you can ask the Valuation Office Agency to check your assessment.
VAT on solar panel installation for businesses
The 0% VAT rate you may have seen advertised applies to energy-saving materials in residential accommodation and in buildings used solely for a relevant charitable purpose, until 31 March 2027. Ordinary commercial premises pay the standard 20% rate. If your business is VAT-registered, you can normally reclaim that VAT in the usual way, so the ex-VAT figures on this page are the ones that matter. Businesses that can’t reclaim VAT, such as some financial services firms and charities whose buildings fall outside the relief, should budget for the full VAT-inclusive price.
Solar panel grants for businesses in 2026
This is the question we’re asked most, so here’s the straight answer: there is no open national grant that pays for solar panels on private commercial buildings in England. Business solar panel grants UK-wide now come from narrow, local or sector-specific schemes that open and close quickly. The main routes, and where they stand as of September 2026, are:
| Scheme | Who it’s for | Status (Sept 2026) |
|---|---|---|
| UK Shared Prosperity Fund (UKSPF) business decarbonisation grants | SMEs, via councils and growth hubs | Closed to new applications on 31 March 2026. This was the main source of commercial solar panel grants in 2024 and 2025. |
| Local Growth Fund | Businesses in mayoral combined authority areas in the North and Midlands | A £1.5bn three-year programme from April 2026. Whether solar is funded depends on each authority’s schemes, so check your combined authority or growth hub. |
| Great British Energy solar programme | State schools, NHS sites and military sites | Up to £255m, supporting around 250 schools, more than 270 NHS sites and about 15 military sites. Sites are chosen through the programme rather than by open application. |
| Public Sector Decarbonisation Scheme and Salix finance | Public bodies, including schools, councils and NHS trusts | Grants and interest-free loans for public buildings, running to 2027/28. |
| Industrial Energy Transformation Fund | Large, energy-intensive industry | No longer taking applications; the government has said it doesn’t plan a successor fund. |
| Business Energy Scotland SME Loan | Scottish SMEs | Interest-free loans up to £100,000, but not currently accepting new solar PV applications. |
| Farming grants (Defra / Rural Payments Agency) | Farms and rural businesses | Open in short rounds; recent equipment rounds have closed. Watch for the next window. |
Scheme status changes often. Confirm on GOV.UK “Find a grant”, with your local council or growth hub, or with the scheme operator before you include any grant in a budget.
In practice, tax relief is worth more to most profitable businesses than any business grants for solar panels they’re likely to get. A company buying a £100,000 system saves up to £25,000 in Corporation Tax through the AIA, and it doesn’t need to wait for a funding round or match a grant condition. Solar panel grants for commercial buildings are worth checking, but don’t let waiting for one hold up a project that already stacks up. For the household side of the picture, see our guides to solar panel government grants in the UK and solar panel grants and free solar panels.
Paying for commercial solar: buy, finance, lease or PPA
Not every business wants to tie up capital, and not every business pays enough tax to benefit from capital allowances. Solar Panels Funded works with installers that offer four main routes:
| Option | Upfront cost | Who owns the panels | Tax relief | Best for |
|---|---|---|---|---|
| Cash purchase | Full cost | You | You claim capital allowances | Profitable businesses with cash to invest and the highest long-term return |
| Asset finance or hire purchase | Low or none | You (at the end of the agreement) | Usually yours to claim; check with your accountant | Businesses that want ownership but prefer to spread the cost; can be cash-positive if monthly savings exceed repayments |
| Operating lease | None | The leasing company | Lease payments are generally a deductible expense | Businesses that want predictable monthly costs without owning the asset |
| Power Purchase Agreement (PPA) | None | A third-party funder | Not yours to claim | Larger roofs, public bodies and firms that won’t use capital; you buy the power produced at an agreed rate below grid prices |
A rooftop PPA is what people usually mean by “free commercial solar”. The funder designs, installs, owns and maintains the system, and you pay only for the electricity it generates, typically for 15–25 years. Funders generally look for larger roofs, a secure lease or freehold, and a creditworthy business, so smaller sites may find finance or leasing a better fit. Read more in our guide to solar panel funding in the UK.
Solar panels for commercial buildings: sector by sector
The best design depends on the building. Here’s how solar panels for commercial buildings typically work in the sectors we see most often.
Warehouses and logistics
Solar panels for warehouses are often the most cost-effective installation there is: big, unshaded, low-pitched roofs where a large array brings the price per kWp down. Refrigerated and automated sites use a lot of daytime power. Check roof loading and lease terms first, and whether landlord consent is needed.
Factories and industrial sites
Industrial solar panels suit sites with continuous daytime loads from motors, compressors and machinery. Many run shifts that absorb almost everything the panels produce. On large sites the industrial solar panel cost falls to the lowest per-kWp band. Industrial solar panel installation usually needs a G99 grid application and, on bigger sites, careful coordination with production to avoid downtime.
Schools and colleges
Solar panels for schools cut bills and give pupils a live lesson in energy. State schools can’t use Corporation Tax relief, so Great British Energy’s programme, Salix funding or a PPA are the usual routes. Holidays reduce summer self-use, so batteries or export arrangements matter more here.
Offices and retail
Lighting, IT, lifts and air conditioning create a steady weekday load that suits solar well. Multi-tenant buildings need an agreement on who owns the system and how tenants are charged for the power.
Farms and rural businesses
Barns, dairies and cold stores often have large roofs and high daytime use from milking, grain drying and refrigeration. Where roof space runs out, ground-mounted arrays are possible but need planning permission beyond small sizes.
Hospitality and leisure
Hotels, gyms and leisure centres have long opening hours and year-round demand for hot water, ventilation and lighting. Pairing solar with a battery helps shift midday output into the busy evening period.
The commercial solar panel installation process
A commercial solar panel installation takes longer than a domestic one, mainly because of design checks and grid approval rather than time on the roof. Most commercial solar panel installations follow the same seven stages:
- Energy review and feasibility1–2 weeks
The installer looks at your half-hourly consumption data, roof plans and current tariff, then sizes a system around how much you’ll use on site. - Site survey and structural assessment1–3 weeks
An engineer checks roof condition, loading, access and the route to your main switchboard. Older or fragile roofs may need a structural engineer’s sign-off. - Design, proposal and funding choice1–2 weeks
You receive a layout, a generation forecast, a financial model and the terms for cash, finance, lease or PPA. - Planning check0–8 weeks
In England, most non-domestic rooftop solar is permitted development under Class J, and the old 1MW cap was removed in December 2023. On flat roofs, equipment can now stand up to 0.6m above the roof. You may still need to ask the council whether prior approval of the design is needed, and listed buildings or conservation areas can need consent. - Grid connection (G99)Weeks to several months
Most commercial systems need your Distribution Network Operator’s approval before they connect. This is often the longest step, and a constrained network can mean an export limit or reinforcement costs. - Installation and commissioningDays to a few weeks
Mounting, panels, inverters, cabling and protection equipment go in, usually with little disruption to trading. The system is tested and commissioned once DNO approval is in place. - Handover, monitoring and maintenanceOngoing
You get monitoring access, certificates and warranties. Plan for periodic solar panel cleaning, annual electrical checks and eventual inverter replacement.
If you want to export surplus power, the Smart Export Guarantee applies to installations up to 5MW. Systems up to 50kW need MCS certification to qualify, and larger ones need to be accredited through Ofgem’s process. For the domestic equivalent, see our solar panel installation guide.
How to choose commercial solar panel installers
Commercial solar panel companies range from national EPC contractors to local electrical firms that also do business work. Whether you’re searching for commercial solar panel installers near you or comparing commercial solar panel installers across the UK, the same checks apply to every commercial solar panel company, from sole-trader electricians to large commercial solar panel installation companies:
- MCS certification for systems up to 50kW, plus membership of NICEIC or NAPIT for electrical work. Check the number on the MCS installer listings yourself.
- Commercial track record: ask for three comparable projects by size and sector, with contacts you can call.
- G99 experience with your Distribution Network Operator, and a realistic connection timeline in writing.
- Roof competence: method statements, working-at-height plans and a warranty that covers any roof penetrations.
- An honest generation model based on your meter data, showing self-consumption, export and degradation assumptions.
- Insurance and warranties: product, performance and workmanship cover, and what happens if the installer stops trading.
- An operations and maintenance offer with monitoring, fault response times and pricing after year one.
What are the best commercial solar panels in the UK?
There isn’t one best brand for every roof. The best solar panels for business, and the best solar panels for commercial use, are the ones that suit your roof, budget and warranty needs. For most business roofs in 2026, look for modules of about 21% efficiency or more, low annual degradation (around 0.4–0.5%), 25–30 year product and performance warranties, and a manufacturer with a solid financial record so the warranty is worth something. On large flat roofs, check the fire classification of the full mounting system as well as the panel. Where roof space is tight, higher-efficiency panels earn their premium; on a huge warehouse roof, value per kWp often matters more. Our guides to buying solar panels in the UK and the best solar panel prices compare manufacturers in more detail, and our installer vetting guide covers red flags to watch for.
If you’d like to see who works near you, our local guides compare verified MCS installers area by area, including many that take on business solar panel installation work, for example in Birmingham, Coventry, Nottingham, Leicester and Warrington. You can also search our solar panel installers near me guide.
Batteries and EV charging: getting more from your panels
A battery stores midday surplus for use later in the day, lifting the share of generation you use on site and cutting how much you import during expensive peak periods. It adds cost, so it tends to pay when a site exports a lot at midday or runs into the evening. Batteries installed with solar are also covered by the business rates exemption in England.
Solar also pairs well with workplace EV charging. Charging company vans or staff cars from your own roof is cheaper than buying the same power from the grid, and offering free or low-cost charging can help with staff retention and recruitment. Businesses can claim a 100% first-year allowance on new electric vehicle charge points, which the Autumn Budget 2025 extended to 31 March 2027 for companies, so it’s worth timing a charger installation alongside your solar project.
Get commercial solar quotes through Solar Panels Funded
Solar Panels Funded is a Birmingham-based solar intermediary at Digbeth Court Business Centre, 162–164 High Street, Birmingham, B12 0LD. We don’t install panels ourselves. We match businesses with vetted, MCS-accredited installers from our network, so one enquiry brings back competitive quotes for your site, whether you’re a single shop or a multi-site manufacturer.
We can help you compare cash purchase, finance, leasing and PPA options side by side, and flag any local funding that applies to your area. Our advice is free and there’s no obligation to go ahead.
Request a free commercial solar consultationCall 0121 340 3350
Commercial solar FAQs
How much do commercial solar panels cost in the UK?
In 2026, commercial solar typically costs £900–£1,200 per kWp for systems under 100kWp, £750–£950 per kWp for 100–500kWp, and £700–£850 per kWp above 500kWp, all before VAT. That puts a 50kWp system at roughly £45,000–£60,000 and a 100kWp system at about £75,000–£95,000. Roof condition, access and grid connection costs cause most of the variation.
Can I claim capital allowances on solar panels?
Yes. HMRC treats solar panels as special rate plant and machinery. Most businesses claim the full cost against taxable profits in year one through the Annual Investment Allowance, which covers up to £1 million of qualifying spending a year. Companies that have used their AIA can claim a 50% first-year allowance on new systems, with the rest written down at 6% a year. Solar doesn’t qualify for full expensing or the new 40% first-year allowance, as both apply to main rate assets only.
Are there government grants for solar panels for business in the UK?
Not a general one. The UK Shared Prosperity Fund, which funded many council business decarbonisation grants, closed to new applications on 31 March 2026. What remains is narrower: the Local Growth Fund in some mayoral combined authority areas, Great British Energy’s programme for schools, NHS and military sites, Salix and the Public Sector Decarbonisation Scheme for public bodies, and occasional farming or local schemes. For most private businesses, tax relief is the bigger saving.
Do I pay VAT on a commercial solar panel installation?
Yes, commercial installations are charged at the standard 20% rate. The 0% rate applies only to residential accommodation and buildings used solely for a relevant charitable purpose, until 31 March 2027. VAT-registered businesses can normally reclaim the VAT, so the ex-VAT price is their real cost.
Do commercial solar panels increase my business rates?
Not in England before 2035. Plant and machinery used for on-site renewable generation and storage, including rooftop solar and batteries, is exempt from business rates from 1 April 2022 to 31 March 2035. Rules differ in Wales, Scotland and Northern Ireland.
Do I need planning permission for solar panels on a commercial building?
Usually not in England. Rooftop solar on non-domestic buildings is permitted development under Class J, and there has been no capacity cap since December 2023. You may need to apply to the council to check whether prior approval of the design is needed, and listed buildings, conservation areas and some Article 4 areas can need consent. Ground-mounted arrays beyond small sizes need planning permission.
How long does a commercial solar installation take?
Work on the roof often takes only days for a small system and a few weeks for a large one. The whole project, from first survey to switch-on, usually takes two to six months, and the grid connection approval (G99) from your Distribution Network Operator is normally the longest step.
Can my business get solar panels with no upfront cost?
Yes, through a Power Purchase Agreement or an operating lease. Under a PPA, a funder installs and owns the system and you buy the electricity it produces at an agreed rate, usually below what you pay the grid. Funders generally prefer larger roofs and a secure lease or freehold. Asset finance is another option if you want to own the system while spreading the cost.
Related reading on Solar Panels Funded
Sources: DESNZ Quarterly Energy Prices (non-domestic electricity, Q1 2026); HMRC Capital Allowances Manual CA22335 and HS252 helpsheet; HM Treasury Autumn Budget 2025 capital allowances measures; The Valuation for Rating (Plant and Machinery) (England) (Amendment) Regulations 2022; GOV.UK and Great British Energy announcements (March and September 2025); Town and Country Planning (General Permitted Development) (England) Order 2015, Part 14, as amended by SI 2023/1279; UK installer price guides published in 2026; PVGIS 5.3 (SARAH-3). Figures checked September 2026. This page is general information, not tax or financial advice; speak to an accountant about your own position.
Average Payback Time
Most businesses recover the cost in roughly 4 to 6 years, or about 3 to 5 years after tax relief. The Annual Investment Allowance lets you deduct the full cost (up to £1 million a year) from taxable profits, saving up to 25p in Corporation Tax for every £1 invested.
An Investment, Not Just Savings
Installing solar panels is more than a cost-saving measure; it’s a strategic investment. After the payback period, your system doesn’t just reduce expenses—it generates profit, cutting your running costs for the rest of the system’s 25-plus-year life.
Preparing for Electric Vehicles, Could You Boost Your Staff Morale?
With the UK’s shift towards electric cars, investing in solar now positions your business ahead of the curve. Offering free car charging to employees can offset future costs and boost staff morale, enhancing your reputation as a forward-thinking employer.
Want to go solar, but not sure how to pay for it?
At Solar Panels Funded, we offer a range of payment options to suit your business’s unique needs. Our team is committed to providing transparent information to help you make a confident decision.
Whether you choose cash, a Power Purchase Agreement (PPA), or a lease, we’ll deliver a top-quality solar solution that maximises your savings and environmental impact. Contact us to learn more and take the first step toward your business’s clean energy future.