Solar Carport Cost UK 2026: Per Bay, Per kWp & Payback

A solar carport turns a car park you already own into a generating asset. But because you are paying for a substantial steel structure as well as the panels, the maths works differently from a rooftop array — and the honest numbers matter if you are going to budget properly. This guide lays out the full cost picture for the UK in 2026: what you pay per kWp, what you pay per bay, what actually drives the price, worked examples by car-park size, and how tax relief and PPAs change the return.

What a solar carport costs: £/kWp and £/bay

There are two ways installers price a solar canopy, and you need both to sense-check a quote.

Per kWp of installed capacity. At commercial scale, elevated solar canopies and carports run £900-£1,400/kWp. Smaller or more complex structures — tight sites, awkward groundworks, low bay counts — sit higher, at £1,200-£3,000/kWp. For comparison, a straightforward rooftop array is £700-£1,050/kWp. The gap is the structure: you are buying steel and foundations that a roof already provides for free.

Per parking bay. As a rule of thumb, a solar carport costs roughly £6,000-£12,000 per bay installed. A standard bay carries about 2 kWp (four to six 450W panels across roughly 12 sqm of canopy), so the per-bay and per-kWp figures line up.

The single most important thing to understand is that cost per kWp falls as the car park gets bigger. That is not a volume discount gimmick — it is structural. Read on.

What drives the price (structure is ~45%)

On a rooftop system, the panels and inverter dominate the bill. On a carport, the mounting system is the roof, and it has to stand up to wind and snow with cars and people underneath it. That changes the cost breakdown completely.

The steel structure and foundations make up around 45% of the total cost of a solar carport. The rest is split between the PV modules, inverters, cabling, the electrical works, and the DNO grid connection. Because that 45% is a largely fixed engineering job — you are erecting frames and sinking foundations whether the site is small or large — spreading it across more bays is what brings the per-kWp figure down toward the £900 end of the range.

Foundations are the part most sites underestimate. In practice, around 90% of sites use ground-screw foundations; the alternatives are ballasted bases (useful where you cannot dig) or driven piles. The structure is engineered to Eurocode 1 (BS EN 1991) for wind and snow loading — this is not optional, and it is why a credible carport costs what it does. Commercial construction also falls under CDM 2015, and all electrical work must meet BS 7671.

The takeaway: if a quote looks suspiciously cheap, ask what standard the frame is engineered to and how the foundations are specified. A bargain canopy that skimps on the 45% is a false economy.

Worked examples by bay count

Numbers land better with real sizing. These examples use ~2 kWp per standard bay and UK yields of roughly 900-950 kWh per kWp (ranging from about 750 in northern Scotland to 1,050 on the south coast). Bifacial panels — which capture reflected light off the ground and cars — add roughly 5-12%.

A small workplace car park (~20 bays, ~40 kWp). At this scale you are toward the higher end of the per-kWp range because the fixed structural cost is spread thinly. Expect roughly £1,200-£1,600/kWp. This size suits topping up a building’s own daytime demand.

A mid-size site (~50 bays, ~90-100 kWp). Now the structure cost is amortised across more capacity, pulling you toward £1,000-£1,300/kWp. A double-sided, back-to-back canopy layout can lift generation to as much as ~4 kWp per bay, improving the return on the same footprint.

A large car park (~100 bays). A hundred bays typically supports 180-270 kWp of solar. At this scale you reach the efficient end — around £900-£1,200/kWp — because the structure is being spread across the most capacity. This is where the economics are strongest.

For a sense of what generation is worth: DESNZ modelling from May 2025 found an 80-space car park could save around £28,000 a year on electricity through self-consumption. And there is a live public-sector example — the Princess Royal Hospital in Telford is building a 200 kW solar car-park canopy backed by £445,000 of Great British Energy funding, projected to save around £35,000 a year, with works from early 2026.

See our full cost breakdown for how these figures translate into a quote for your site.

Payback: 8-12 years (7-11 with EV)

Here is where we are deliberately honest, because a lot of marketing is not. A solar carport does not pay back as fast as a rooftop system, and you should budget on that basis.

• Solar-only payback: 8-12 years. You are paying for the structure as well as the panels, so the break-even is longer than a roof’s.
• With EV charging: 7-11 years. Adding charge points shortens payback because you convert cheap on-site solar into a service — see below.
• Rooftop, for reference: 4-6 years.

We will not quote a five-year solar-only payback for a carport, because it is not realistic. Anyone who does is either ignoring the structural cost or hoping you will not check. The upside is that a well-built canopy is a 25-year-plus asset engineered to Eurocode standards, so the years after payback are close to free electricity — and the structure adds shade, weather protection and EV-ready infrastructure that a bare roof does not.

How EV charging improves the maths

The reason EV charging tightens payback is simple. Self-consumed solar is worth roughly twice what you get for exporting it. Solar delivered under your own canopy costs around 10p/kWh, against grid electricity at 30-47p/kWh. Charging vehicles with your own generation captures that full spread instead of exporting surplus for a few pence.

One honest limit you should know before you plan: a solar canopy comfortably powers 7kW and 22kW AC charging plus site lighting. It does not power standalone 50kW+ DC rapid chargers on its own — those need a grid connection plus battery storage. Any installer who implies a canopy alone will run rapid DC charging is overselling it. For the workplace and destination charging most car parks actually need, a canopy is an excellent fit — and our EV-charging solar canopies page covers that pairing in detail.

Planning and grid: what affects the timeline (and cost)

Two things can add time and cost, so factor them in.

Planning. In England, the Class OA permitted development right (in force since 21 December 2023) covers solar canopies over non-domestic, off-street parking. That means a prior-approval application on siting, design and glare — not a full planning application. The limits: no part over 4m high, more than 10m from any dwelling, excluding listed buildings and scheduled monuments, with a SuDS run-off condition over permeable surfaces, and you must start within three years. Crucially, this is England only — Wales, Scotland and Northern Ireland still require standard planning permission, which takes longer. Domestic carports follow householder permitted development as an outbuilding (max 4m high, 3m within 2m of a boundary, behind the principal elevation, under 50% of the curtilage), with applications needed for listed buildings, conservation areas and National Parks.

Grid connection. Small systems up to 3.68kW per phase use the simple G98 “fit and inform” route. Most commercial canopies exceed that and need G99 pre-approval from the DNO, typically 4-8 weeks (up to 8-12 in some cases). To claim the Smart Export Guarantee you also need MCS certification on the system.

How tax relief and PPAs change the maths

This is the part that quietly transforms a carport’s return for a business — and where a lot of incorrect advice circulates.

Capital allowances. A business can use the £1m Annual Investment Allowance (AIA) and the 50% First-Year Allowance (FYA) on the spend. One important correction: solar is a special-rate asset and is excluded from 100% full expensing. If anyone tells you a solar carport qualifies for full expensing, they are wrong — it does not. The 50% FYA is still a meaningful first-year deduction, and the AIA can cover qualifying spend up to £1m.

Business rates. In England, on-site renewable generation is exempt from business rates to 31 March 2035 — a real, ongoing saving.

VAT. Domestic solar carries 0% VAT to 31 March 2027. Whether that zero rate extends to a standalone canopy in a domestic curtilage is not confirmed by HMRC, so check your specific case before assuming it applies.

Export income. The Smart Export Guarantee is open, paying roughly 1-15p/kWh for exported power — though, as above, self-consumption is worth far more.

Grants that are actually open. The Workplace Charging Scheme runs to 31 March 2027 (up to £500 per socket, £2,000 for state-funded education, 75% of cost, up to 40 sockets, via an OZEV-authorised installer). Great British Energy capital is available for the NHS and schools, and Salix offers 0% loans to schools. See grants and funding for the current picture.

What has closed — do not let anyone present these as live: the Public Sector Decarbonisation Scheme (PSDS) closed to new applicants in November 2024, and the staff-and-fleets EV infrastructure grant closed on 31 March 2026. And to be clear on the much-discussed car-park solar mandate: it is only a call for evidence (May-June 2025), not law. Building now future-proofs you before any such requirement lands — it is not yet a legal obligation.

PPAs (Power Purchase Agreements). If the capital cost is the barrier, a PPA lets a third party fund, own and maintain the canopy while you simply buy the solar power it generates — usually below grid price — with no upfront outlay. You forgo the capital allowances and export income (the asset owner takes those), but you get the cheaper electricity and the shaded, EV-ready car park from day one. It changes the maths from a capital decision to an operating one.

The bottom line

Budget £900-£1,400/kWp at commercial scale (more for small or complex sites), or about £6,000-£12,000 per bay, remembering that the ~45% structural cost means bigger car parks are cheaper per kWp. Plan for 8-12 years payback solar-only, 7-11 with EV charging, and use AIA and the 50% FYA — not full expensing — to improve the after-tax return.

We are a turnkey, MCS-certified installer: structure, PV, electrical and DNO connection under one contract — not a bare frame. We hold MCS, NICEIC, RECC and TrustMark accreditation with an IWA-backed workmanship warranty. For a costed proposal for your specific car park, request a free quote or call +44 7707 970661.