Solar Carports UK: What the Structure Has to Do

A solar carport is an engineered steel structure built above a car park, fitted with solar PV panels on its roof. It turns previously unproductive tarmac into a high-yield commercial solar asset while providing shelter for vehicles below. Solar carports suit commercial sites with large car parks and limited or unsuitable roof space.

Solar carport sizing follows a simple rule: ~1.5 kWp per parking bay for a single-deck flat carport with bifacial Tier-1 panels. A 200-bay car park therefore supports ~300 kWp. At a 10° canopy pitch in Birmingham (875 kWh/kWp/yr on PVGIS v5.3) that is about 262,000 kWh/yr. At 47p/kWh and 75% self-consumption it displaces roughly £92,000 of imported electricity a year, with the balance exported at a much lower rate — see solar carport cost for the full model.

Solar Carport Cost UK 2026: Price per Bay, kWp and Payback

UK commercial solar carports typically cost around £950–£1,300 per kWp installed, all-in. Because a single-deck canopy generates roughly 1.5 kWp per parking bay, you can size and budget a scheme straight from your space count. The table below shows typical turnkey figures across common scheme sizes. Figures are indicative ex-VAT bands; a fixed price needs an installer's site survey and written quote.

Savings assume self-consumption displacing grid electricity at around 40–50p/kWh; payback shortens once the Annual Investment Allowance (100% first-year tax relief, currently up to £1m per company group) is applied. Bifacial panels can lift yield by around 5–12%, and EV-ready DC stubs added at build avoid costly retrofits later. Tell us about the car park. We reply by email.

Solar Carport vs Rooftop vs Ground-Mount Solar

A carport is not the cheapest way to mount panels per kWp, but it is often the best commercial choice because it monetises land you already own, shelters vehicles and integrates EV charging in one structure. Here is how the three mounting routes typically compare for a UK commercial site.

For organisations with a large surface car park and an EV transition ahead, the carport's higher £/kWp is offset by zero land cost, the bifacial bonus and a single planning and grid-connection process covering both solar and charging.

A Solar Carport Is a Commercial Energy Asset, Not Just a Canopy

Treated correctly, a solar carport is a balance-sheet asset that hedges energy cost and supports compliance:

• MEES and EPC: on-site generation reduces a building's energy intensity and can support its EPC rating under the Minimum Energy Efficiency Standards, helping protect lettable value (the government has also consulted on tightening commercial MEES thresholds later this decade).
• Scope 2 reduction: self-consumed solar directly cuts purchased-electricity (Scope 2) emissions — a measurable, auditable line in corporate reporting and net-zero plans.
• Business case: with capex of roughly £290k–£345k on a 200-bay (~300 kWp) scheme, typical savings near £112k–£125k a year and AIA giving 100% first-year tax relief, the asset typically pays back in around 4–7 years (3–4 after AIA) and then generates net positive cashflow across the remaining 20-plus year design life.

Any organisation with workplace parking can also claim the OZEV Workplace Charging Scheme (currently £500 per socket since 1 April 2026, up to 40 sockets) towards EV charge points. Tell us about the car park. We reply by email.

Planning permission: most car-park canopies in England are permitted development

The claim that a commercial solar carport “almost always needs full planning permission” has been out of date since 21 December 2023. Class OA of Part 14, Schedule 2 of the GPDO (inserted by S.I. 2023/1279) permits the installation, alteration or replacement of a solar canopy within an area lawfully used as off-street parking, other than parking for a dwellinghouse or a block of flats. It is a lighter consent route, not an absence of consent: prior approval is always required.

Class OA does not cover:

• any part of the canopy more than 4 m above ground level;
• a car park inside, or within 10 m of, the curtilage of a dwellinghouse or block of flats;
• land on or within the curtilage of a scheduled monument, or within the curtilage of a listed building;
• a canopy used to display advertisements, or a car park in temporary use under Part 4 Class B.

Prior approval under OA.2(3) is judged on siting, design and external appearance — and specifically the impact of glare, which is named in the legislation. On article 2(3) land (conservation areas, National Landscapes, National Parks, the Broads and World Heritage Sites) the effect on that land is assessed as well; those areas are not excluded from Class OA, because the 2023 proposal to exclude them was dropped. The Class J procedure then applies: determination is deemed after 56 days, a site notice runs for at least 21 days or adjoining owners are notified, the work must be completed within three years, and run-off must discharge to a permeable area where the canopy sits over a permeable surface.

Two distinctions worth keeping straight, because canopy pages routinely blur them. Class K — stand-alone solar next to a non-domestic building, capped at 9 m² and 4 m and set 5 m from the boundary — is a different class; copy quoting “9 m²” or “5 m from a highway” for a multi-bay canopy is applying the wrong one. In Scotland, canopies sit under Class 9M rather than the rooftop Class 6J. Where a scheme falls outside Class OA — taller than 4 m, beside housing, or in a listed building’s curtilage — a full application follows, and that is where the wider planning balance and the current NPPF policies matter.

What to specify — and what a retail carport kit will not give you

Search results for solar carports mix three different products: retail carport kits sold by the unit, solar installers who buy in frames, and turnkey suppliers carrying structure, solar, electrical and charging under one contract. On a capital project the difference shows up in who is liable when something does not line up on site, so specify the structure rather than the panel wattage:

• Fabrication to BS EN 1090 with the execution class stated, and CE or UKCA marking on the steelwork.
• Wind and snow loading calculated for your postcode to BS EN 1991-1-4 and BS EN 1991-1-3 — not a generic datasheet. An open-sided canopy roof is usually governed by uplift rather than by downward load.
• Corrosion protection: hot-dip galvanising to BS EN ISO 1461, with the coating thickness stated.
• Clearance height fixed against the vehicles that actually use the car park, and kept under 4 m if the scheme is relying on Class OA.
• Grid route: G98 covers only 16 A per phase (about 3.68 kW per phase), so a commercial canopy is a G99 application, and the DNO timeline usually sets the programme rather than planning.
• EV-ready DC stubs run at build, so charge points can be added later without lifting the surface twice.
• Building control: the Building Regulations exemption for a carport is a ground-level structure up to 30 m² open on at least two sides, so for a multi-bay canopy confirm the position with your building control body rather than assuming exemption.

Solar carports and retail carport kits are not the same product

Search “solar carports” and the results mix two completely different things: commercial canopies over 100+ bay car parks, and single-car kits sold on marketplaces for a few thousand pounds. They share a name and almost nothing else, and the confusion costs real money when a facilities team benchmarks one against the other.

A commercial solar carport is a structure first. The frame is fabricated to BS EN 1090 with a declared execution class, galvanised to BS EN ISO 1461, and designed to Eurocode wind and snow loading for the actual site — a canopy in Glasgow carries a different snow load from one in Portsmouth. It needs foundations designed against a ground investigation, a drainage strategy because it creates a new impermeable area, and a CDM 2015 appointment chain with a principal designer, because work over an operational car park is construction work.

A retail kit has none of that: no site-specific loading calculation, no execution class, no CDM chain, and no G99 connection. It is the right product for a driveway and the wrong one for a car park, and no amount of unit-price comparison closes the gap. Current UK pricing per kWp, and what moves it, sits on solar carport cost.

The approvals a solar carport needs, in the order they bite

Four approvals run on different clocks, and the order matters more than the list.

1. Grid, first. A car park array is a G99 connection — G98 stops at 16 A per phase, about 3.68 kW per phase. The DNO response can carry a connection cost, a curtailment condition or a queue position, and it is the one answer that can end a scheme outright, so it should be in flight before design is finalised rather than after planning.

2. Planning. In England a canopy over an existing off-street car park is permitted development subject to prior approval under Class OA, 4 metre height limit, 56 days to determine. Wales has no equivalent right and needs a full application. Article 4 directions and conservation-area status can remove the right.

3. Building regulations and structures. Foundations against a ground investigation, Eurocode loading for the site, and the structural calculations an approver will ask to see.

4. CDM 2015. Building over a car park that stays partly in use is construction work with live traffic, so the appointments, the traffic management plan and the phasing are part of the design, not an afterthought at mobilisation.

Schemes slip when these are run in sequence. Run the G99 application and the prior-approval submission in parallel and the 56-day clock becomes the critical path rather than the grid. The sizing arithmetic behind the array itself is on car park solar panels.

Tilt, orientation and the 4 metre limit

Output depends on tilt and orientation as much as on panel count. Across four UK sites, PVGIS shows each 5° of tilt between 5° and 20° adding roughly 3–4% a year, and an east-west layout giving up about 8–9% against south-facing at 10°. In England the permitted-development route stops at 4 metres, so tilt, span and the clearance under the low edge have to be chosen together; solar carport design: tilt, orientation and height limits has the tables. Why most car parks still have no canopy is covered in why don't more UK car parks have solar panels, and if the same car park needs lighting, solar car park lighting shows how to size standalone solar lights for December.