How Much Does Commercial Solar PV Cost in 2026?

The short answer on commercial solar panels cost

Commercial solar panels cost between £600 and £1,300 per kilowatt-peak (kWp) installed in the UK in 2026, and where your project lands in that range depends almost entirely on system size. Small systems carry more fixed cost per unit of capacity. Large systems spread scaffolding, design, grid application and mobilisation across far more panels, so the per-kWp rate drops sharply.

That is the headline. The rest of this guide breaks down what those numbers mean in real money, what sits inside the price, how tax relief and export income change the picture, and how the three funding routes compare. Every figure here is a genuine UK market range, not a sales number. If you want a modelled quote for your own building, our cost guide and free desk feasibility work from your half-hourly meter data.

What commercial solar PV actually costs per kWp

Price per kWp falls as system size rises. Here is the 2026 UK picture across the sizes we quote most often.

System size	Cost per kWp	Typical total install	Rough building type
Under 100 kW	£900 to £1,300	£45,000 to £120,000	Office, small retail, showroom
100 to 250 kW	£750 to £950	£85,000 to £240,000	Warehouse, mid-size industrial unit
250 to 500 kW	£700 to £850	£190,000 to £425,000	Large warehouse, distribution centre
Above 500 kW	£600 to £800	£350,000 to £1.5m	Factory, manufacturing plant

Put in plain money: a 50 kW rooftop system for an office is roughly £45,000 to £60,000. A 250 kW warehouse array is around £190,000 to £240,000. A 1 MW factory system lands near £600,000 to £750,000. These are fully installed, commissioned figures, not the cost of panels alone.

Do not size a system from roof area. As a rule of thumb, 1 kWp of PV needs about 5 to 6 sqm of unshaded roof and generates roughly 900 to 1,000 kWh a year in the UK. But the right size is set by your consumption shape, not your roof. We aim for annual generation equal to 60 to 85% of your current use, which maximises the power you consume on site and avoids dumping cheap surplus onto the grid.

What is included in the price

A per-kWp figure is only useful if you know what it covers. A properly scoped commercial proposal includes the panels, mounting system, inverters, DC and AC cabling, isolators and protection, the labour and access equipment, commissioning, and the G99 grid application. It should also include the design work: a PVSyst yield model built from your meter data and roof drawings, not a per-square-metre guess.

What sits outside the base price varies by building. A structural survey is usually needed on roofs over about 1,000 sqm to check the added dead load and wind uplift. Pre-2000 roofs need an asbestos survey. Battery storage, if you choose it, is a separate line. And older or short-warranty roofs may need remedial work before any array goes on top. An honest quote flags these before you sign rather than after. Our FAQs page covers the common scoping questions in more detail.

Payback: the number that actually matters

Most UK commercial solar installations pay back in 5 to 8 years. The panels carry a 25-year performance warranty, so once the system has paid for itself it delivers 15 to 20 years of near-free power.

Where you land in that 5 to 8 year band comes down to self-consumption, meaning how much of the generated power you use on site rather than export. The more you use directly, the more you save, because every self-consumed unit offsets a 25 to 45p grid unit rather than earning a 4 to 15p export payment.

Building type	Typical self-consumption	Typical payback	Why
Manufacturing and factories	80%+	5 years	High, steady daytime process load
Warehouses and industrial	65 to 80%	6 years	Forklift charging, refrigeration, MHE baseload
Retail and showrooms	60 to 75%	6 years	Long daytime trading, lighting and HVAC
Offices	60 to 80%	7 years	Daytime occupancy, lighter weekend use
Hospitality and leisure	55 to 75%	7 years	Evening-weighted load suits a battery
Public sector and education	55 to 75%	7 years	Term-time and opening-hours demand

A daytime-occupied building consumes 55 to 75% of its solar directly with no battery at all. That is why a factory running a steady process line beats an office with quiet weekends. You can compare your own figures on our savings calculator.

Tax relief and export income cut the real cost

The headline install price is not what a profitable business actually pays. Two levers change the economics.

100% Annual Investment Allowance (AIA). Solar PV qualifies as plant and machinery, so a company paying corporation tax can deduct the full capital cost from taxable profit in the year of purchase, up to the £1m AIA cap. For a profitable limited company that is an effective saving of roughly 25% of the capex. Most commercial installs sit well below the cap and are fully expensed in year one. A 250 kW system with a £220,000 headline cost has an effective net cost closer to £165,000 once the tax relief is applied.

VAT is reclaimable. This is where many buyers get confused. The 0% VAT rate is a domestic-only relief. Commercial solar is charged at standard-rate VAT, but a VAT-registered business reclaims it in the normal way, so it is not a real cost. Do not let anyone quote you a “0% VAT” commercial deal, that is not how it works.

Smart Export Guarantee (SEG). Surplus power exported to the grid earns roughly 4 to 15p per kWh depending on the tariff and supplier. Buildings without round-the-clock demand, such as offices, retail and schools, export 25 to 45% of what they generate, so a competitive SEG tariff is a meaningful part of the return rather than an afterthought.

Beyond these, sector grants exist: the Industrial Energy Transformation Fund for energy-intensive manufacturers, Salix and the Public Sector Decarbonisation Scheme for public bodies, and periodic regional business grants. Our grants and funding guide covers what applies to your sector and how to apply.

Cash, asset finance or PPA: how the funding routes compare

Most commercial installs do not need upfront capital. There are three routes and the right one depends on your balance sheet, your tax position and how long you expect to hold the building.

Route	Upfront cost	Who owns the system	Best for
Cash purchase	Full capex	You, from day one	Cash-rich, profitable companies wanting maximum lifetime return and full AIA benefit
Asset finance	None	You (after the term)	Businesses wanting ownership without tying up capital; usually cash-flow positive from month one
Power Purchase Agreement (PPA)	None	The funder	Zero-capex sites, tenants, or where solar sits off the balance sheet

With cash purchase you capture the full AIA relief and the strongest long-term IRR, because you keep every unit of saving for 25 years.

With asset finance the cost spreads over 5 to 7 years. The monthly finance payment is typically less than the bill saving it replaces, so the project is cash-flow positive from the start, and you own the system outright at the end.

With a PPA, a funder installs and owns the system, and you simply buy the power it generates at a fixed rate below grid. No capex, no maintenance liability, and the agreement can transfer with the building if you sell. The trade-off is a lower lifetime return than owning, because the funder keeps a share.

We model all three side by side on every quote, with the IRR for each, so the decision is made on numbers rather than on which route an installer prefers to push.

Rooftop, ground-mount or solar carport

Most commercial PV goes on the roof, because that space is already yours and rooftop is the cheapest route per kWp. Where roof area falls short of demand, or a roof cannot take the load, two alternatives come into play.

Ground-mount suits sites with spare land, common in agriculture and on larger manufacturing sites. It costs more per kWp than rooftop because of groundworks and framing, and above permitted-development thresholds it needs full planning permission.

Solar carports turn a car park into generation while providing shade and a natural home for EV charging. They carry the highest per-kWp cost of the three because of the steel structure, but they add value where roof and land are both limited.

For most warehouses and industrial units, a large unshaded steel-portal roof is the single best canvas for commercial PV in the UK, and rooftop alone will meet most or all of demand.

Should you add a battery?

Battery storage lifts self-consumption from 55 to 75% up to 80 to 95%, and typically adds 25 to 40% to annual savings. It also lengthens payback, because the battery is a significant extra cost that earns its return more slowly than the panels.

Storage makes the strongest case where a meaningful share of your demand falls outside generation hours: evenings, weekends or overnight. A hotel with an evening-weighted load, or a warehouse with round-the-clock refrigeration, will get more from a battery than a nine-to-five office that already consumes most of its solar in real time.

We model PV-only and PV-plus-battery side by side, and design every system to be battery-ready even if you add storage later, so the decision is never locked in on day one.

What to do next

Commercial solar is an engineering and finance exercise, not a wiring job, and the numbers turn on your building’s specific load profile. The per-kWp ranges above will get you to a realistic budget, but the payback, the funding route and the right size all need modelling from your actual consumption.

Start with your half-hourly meter data and a set of roof drawings. From there we build a PVSyst yield model, run the three funding routes, and return a fixed-price proposal within 7 working days. Request a free no-obligation quote, read the full real-world UK pricing breakdown, or check what funding applies to your sector.