Solar carport installation cost in 2026: per space and per kW

If you run an estate, a car park or a distribution site and you have been quoted for a solar canopy, the first question is always the same: what does it actually cost to install. The honest answer is a range, because a solar carport is a structure first and a power station second. You are buying steel, foundations and civil works as much as you are buying panels. This guide breaks solar carport installation cost in 2026 down to line items, gives you the two rate metrics that matter — per parking space and per kWp — and works through an illustrative 100-space scheme so you can sense-check any quote that lands on your desk.

The two numbers that matter: per space and per kWp

There are two ways installers price solar carport work, and they measure different things.

Per parking space typically lands at £6,000–£12,000 ex VAT. This is an all-in delivered figure covering the canopy structure, foundations, panels, electrics and often EV provision per bay. It is the more honest number for budgeting because it captures the civils and steel that dominate a carport, not just the generating kit.

Per kWp runs at roughly £1,100–£1,600 ex VAT on larger schemes, rising to £1,200–£3,000 per kWp on smaller ones where fixed costs are spread over fewer panels. This is the rate for the generating array itself and it is the number people quote when comparing against rooftop.

The two do not cleanly multiply. A bay carries around 2 kWp of panels, so a naive per-kWp calculation would suggest £2,200–£3,200 per space — well under the per-space figure. The gap is the structure: the frame, foundations and cabling per bay cost roughly the same whether you fit premium panels or budget ones, and they do not scale down with wattage. That is why per-space is the metric to trust for a whole-car-park budget, and per-kWp is the metric to trust when you are comparing generating value. Our cost guide sets out both in more detail.

What you are actually paying for: the line items

A solar carport installation quote should break down roughly as follows. Proportions vary by site, but the shape is consistent.

Groundworks and foundations

Every canopy needs foundations, and ground conditions drive this line more than any other. On clean, well-compacted ground with known services, concrete pad or screw-pile foundations are quick. On made ground, contaminated land, high water tables or sites laced with buried services, you may need piled foundations, ground investigation surveys and drainage design. Expect groundworks and civils to run 15–25% of a scheme, and much more where conditions are poor.

The steel frame (40–50% of the cost)

The single biggest line is the canopy steelwork. On a solar carport the frame typically accounts for 40–50% of total installed cost — the exact inversion of a rooftop system, where the roof already exists and the mounting is trivial. Steel price, span (single-bay versus double-bay cantilever), snow and wind loading, and the finish specification all move this number. Longer clear spans that avoid mid-bay columns look better and park better, but they cost more in steel.

Panels, inverters and electrical

The panels themselves are a smaller share than most people expect — often 15–25%. Add string or central inverters, DC and AC cabling, isolators, metering, labelling and the connection into your distribution board. Running cable across or under a live car park adds trenching and reinstatement cost that a rooftop job never sees.

DNO and grid connection

Anything beyond a very small system needs your Distribution Network Operator’s sign-off. Under G98 you can fit-and-inform only up to 3.68kW per phase; above that — which is almost every commercial carport — you need G99 pre-approval before you energise. G99 assessments commonly take 8–16 weeks and are usually the longest item on the programme, so start early. If the network in your area is constrained, the DNO may require reinforcement works, and that can be the single biggest swing factor in a quote. Always price against your own DNO’s connection offer, not a generic figure.

Planning, design and professional fees

In England, most freestanding solar canopies now fall under Class OA permitted development (in force since 21 December 2023), which means prior approval rather than a full planning application. The council considers siting, design and glare, with SuDS surface-water run-off attached as a mandatory condition. The right applies to canopies up to 4m high, more than 10m from a dwelling, excluding listed and scheduled sites, with a 56-day determination and a requirement to complete within three years. It is a standing right, not a limited window — there is no reason to rush a decision. In Wales, Cardiff schemes still generally need full planning permission on a case-by-case basis; Scotland has its own permitted-development route. Budget for structural and electrical design, a glare assessment where relevant, and the prior-approval or planning fee. Our planning permission guide covers this by nation.

Labour and preliminaries

Site setup, traffic management, welfare, craneage for steel erection, scaffolding where needed, and the labour to assemble it all. Working around a car park that has to stay partly operational — phased closures, out-of-hours working — pushes preliminaries up. Our walkthrough of how solar carports are installed shows where these costs sit in the programme.

What pushes the cost up

Four things move a quote most:

• Ground conditions. Contamination, made ground or unknown services can double the foundations line.
• Span and design. Long clear spans and architectural finishes cost more steel.
• DNO reinforcement. A constrained network can add a five- or six-figure connection cost, or a long wait.
• EV charging. Adding chargepoints brings cabling, groundworks and switchgear — but also the Workplace Charging Scheme grant of £500 per socket (up to £2,000 per socket for state-funded education), covering up to 75% of cost across up to 40 sockets, available until 31 March 2027. See our grants and funding page.

VAT, capital allowances and business rates

Quote and budget ex VAT for a commercial scheme. The 20% VAT is recoverable by a VAT-registered business, so it is a cash-flow timing point, not a true cost. The 0% VAT rate you may have read about is residential only, running to 31 March 2027 and then reverting to 5% — it does not apply to a commercial carport.

On capital allowances, solar PV is a special-rate asset. It does not qualify for full expensing. It does qualify for the Annual Investment Allowance at 100% up to the £1m cap, and companies can claim the 50% First Year Allowance on special-rate expenditure above that. In England, business rates on eligible on-site renewable generation are exempt until 31 March 2035, though that relief does not extend to Wales or Scotland. These reliefs are genuinely valuable, but the detail depends on your accounts — take your own tax advice before you rely on any of it.

Worked example: a 100-space scheme (illustrative)

This scenario is illustrative and no substitute for a site survey. Take a 100-space car park fitted at roughly 2 kWp per bay, giving a system of around 200 kWp.

• Generation: at the UK national yield of roughly 900–950 kWh/kWp, that is about 180,000–190,000 kWh a year. Per bay, around 1,700–2,000 kWh — not a single guaranteed figure, because orientation, shading and weather all move it.
• Installed cost, solar only: at £1,100–£1,600 per kWp, the array comes in around £220,000–£320,000 ex VAT.
• All-in per space: with the canopy structure, foundations, extensive civils and electrical works, a delivered scheme sits toward £6,000–£9,000 per space, so roughly £600,000–£900,000 ex VAT for the 100 bays. Of that, the steel frame alone is perhaps £280,000–£400,000.
• Payback: around 8–10 years on solar alone, and shorter where you add EV charging and consume most of the generation on site rather than exporting it.

The numbers reconcile once you see that the per-space figure carries the whole structure per bay, while the per-kWp figure prices only the array within it.

How it compares to rooftop solar

Rooftop commercial solar runs at roughly £700–£1,050 per kWp because the mounting structure already exists. A carport at £1,100–£1,600 per kWp is therefore two to three times the rate — you are paying for a building, not a bracket. What you get back is generation on land you already own, weather protection and EV-ready infrastructure over the same footprint, which is why carports make sense where roof space is scarce or already committed. If you are weighing a canopy against other renewable options for your site, our verticals pages set out where each fits.

Getting an accurate number for your site

Every figure here is a planning range. The only cost that means anything is one built on your ground conditions, your DNO’s connection offer and your bay layout. If you would like an itemised estimate rather than a headline rate, request a quote and we will scope it against your actual site.