Solar panel canopies · checked 14 October 2026
Solar canopies for UK car parks: size, yield, cost and consent
A solar panel canopy is a free-standing steel structure carrying solar modules above a car park or hardstanding. It generates into a load you already pay for, on land you already own, and leaves the parking underneath in use. This page gives you the arithmetic to size one from your own bay count, the modelled yield for your city, the one published UK cost illustration we found, and the consent and grid routes — with the assumptions shown so you can substitute your own figures.
In short
- Capacity: about four modules per standard bay after allowances — roughly 1.7 kWp per space, so 100 bays is around 170 kWp.
- Yield at canopy pitch: 946 kWh/kWp in Cardiff down to 772 in Glasgow. Use your own city.
- Cost: one published UK figure — DESNZ's 80-space illustration at about £140,000, implying ~£1,000/kWp. Treat tighter bands with suspicion.
- Grid: always G99. G98 stops at 16 A per phase, so no commercial canopy falls inside it.
- Consent: Class OA prior approval in England, Class 9M in Scotland, a full application in Wales.
Solar canopy, solar panel canopy, solar PV canopy — the same thing
The terminology in UK tendering is loose, and it matters mainly because a quotation can mean a structure with no generation at all. What the terms actually denote:
| Term | What it means |
|---|---|
| Solar canopy | The general term for a free-standing structure carrying solar modules over an open area. Used for car parks, walkways, service yards and entrances alike. |
| Solar panel canopy | The same structure, named after what it carries. No technical distinction — the two are used interchangeably in UK tendering. |
| Solar PV canopy | Identical again, with "PV" distinguishing photovoltaic generation from solar thermal. Thermal canopies are effectively never used over parking. |
| Solar carport | Conventionally the smaller single-row installations, typically over a handful of bays. Same engineering, same consent route — see our solar carport page. |
| Car park canopy | Often used for shelters with no generation at all. Worth checking what a quotation means by it, because shelter suppliers and solar suppliers both use the phrase. |
The practical consequence: when comparing quotations, confirm whether each one includes generation, and at what capacity. A cheaper "car park canopy" that is a shelter is not a cheaper solar canopy. Our solar carport page covers the smaller single-row format in detail, and car park solar canopies covers large multi-row layouts.
Sizing from your bay count
You can reach a usable capacity figure before any survey, from geometry you already know:
- A standard UK parking bay is 2.4 m by 4.8 m — about 11.5 m².
- A current 430 W module measures roughly 1.13 m by 1.76 m — about 2 m².
- Six modules fit over a bay on area alone; allow for beams, gutters, edge setback and maintenance access and four per bay is realistic.
- Four 430 W modules is about 1.7 kWp per space.
So a 50-bay car park is in the order of 86 kWp and 100 bays around 170 kWp. These are planning-stage numbers, not a design: a real layout loses bays to columns, aisles, turning circles and shading, and gains nothing back. The figure is useful precisely because it lets you sanity-check a supplier — a proposal claiming 3 kWp or more per bay implies roughly eight modules over 11.5 m², which does not physically fit.
What it will generate, by location
A canopy sits at a shallow pitch — typically around 10 degrees, because a steeper deck over parking needs more height and more steel. Modelled annual output per kilowatt installed at that tilt:
| City | kWh per kWp per year (10° tilt) |
|---|---|
| Cardiff | 946 |
| Newport | 938 |
| Swansea | 921 |
| London | 920 |
| Birmingham | 875 |
| Manchester | 807 |
| Edinburgh | 805 |
| Aberdeen | 791 |
| Glasgow | 772 |
| Inverness | 734 |
Modelled in PVGIS for crystalline silicon at a 10° tilt with 14% system loss. Multiply by your own capacity to get annual kWh, then by the import tariff you avoid and a realistic self-consumption share to get a saving. We deliberately do not publish a saving table: the two variables that decide it — your tariff and your load profile — are specific to your site, and a table that assumes them is guessing on your behalf.
One consequence of the shallow pitch worth planning for: rain clears a 10° deck less effectively than a steep roof, so soiling losses run slightly higher and the cleaning interval matters more than on a building. Our solar canopy maintenance page covers the O&M terms to ask for.
Cost: the one published UK figure
When DESNZ consulted on requiring solar canopies on new car parks, it published an illustrative appraisal for an 80-space car park: approximately £140,000 to install, about £28,000 a year of energy savings, about £22,000 a year of EV charging revenue, about £1,400 a year of maintenance — and, assuming a three-and-a-half-month closure, about £180,000 of foregone parking revenue.
Two things to take from it. The derived unit cost: 80 bays at roughly 1.7 kWp is about 136 kWp, so £140,000 is in the order of £1,000 per kWp — a single government illustration with visible workings, which is more than any commercial per-kWp band offers. And the larger point: the foregone parking was the biggest number in the appraisal. A cost model that stops at the capital figure has left out the largest line. The proposal to mandate canopies was not taken forward, confirmed on 21 May 2026, but the appraisal stands. The full cost hierarchy is on our solar carport page and bands by size on our solar canopy cost page.
Specifying the PV side, not just the steel
Most canopy conversations are about the structure, and most canopy quotations treat the modules as a commodity line. But a canopy puts photovoltaics in a place a roof does not: directly above people and vehicles, at low level, outdoors, on a deck where wind acts upwards. Four specification points follow from that, and they are worth settling before a frame is ordered. A photovoltaic (PV) canopy is the same structure described by its generation technology. How the whole system works, from modules to inverter and grid connection, is in how a solar canopy works.
Module construction. A conventional module is glass on the front and a polymer backsheet behind. A glass-glass (dual-glass) laminate puts glass on both faces. Over occupied space the dual-glass construction is the more robust choice, because the rear face is a structural sheet rather than a film, and it is also the construction used where any light transmission is wanted. It is heavier, which is precisely why the glazing decision has to precede the structural calculation rather than follow it. Whatever is specified, ask for the module's IEC 61215 design qualification and IEC 61730 safety qualification — these are the standard module certifications, and a supplier who cannot produce them for the exact model being supplied is not supplying a known product.
Fixing against uplift. On a shallow, exposed deck, wind uplift rather than gravity usually governs the design, and that applies to the module fixings as much as to the frame. Clamp type, clamp spacing and the permitted clamping zones are set by the module manufacturer, and fixings outside those zones can void the product warranty regardless of whether the structure stands. Ask for the mounting detail against the manufacturer's installation manual, not just the frame drawing.
Inverters and DC runs. A canopy is long, low and often remote from the plant room, so DC cable runs are longer than on a comparable roof array, and voltage drop and cable sizing matter more. Where buildings, trees or neighbouring canopy rows shade part of the deck for part of the day, module-level electronics or a greater number of smaller strings will recover more than a single large string will. Inverter siting is also an amenity question on a canopy in a way it is not on a roof — they are audible, and a car park is at head height rather than three storeys up.
Protection and isolation. DC cabling on a canopy is reachable. It needs mechanical protection against vehicle strike and interference, in proper containment rather than tray at head height, and the DC isolation arrangements and labelling need to be accessible and legible for maintenance and for the fire service. The electrical installation is certified to BS 7671, and the certificate should cover the DC and AC elements at handover; where the canopy carries chargepoints, their circuits are part of the same picture.
None of this is exotic, and a competent installer will have answers. The reason to ask is that the structural and the electrical scopes are frequently priced by different parties, and these four items fall in the gap between them.
Consent and grid connection
England. Class OA of Part 14 has covered canopies above off-street non-domestic parking since December 2023, introduced by S.I. 2023/1279. It is a prior approval route: 56 days to determine, glare assessed in every case, 4 m maximum height and 10 m from the curtilage of a dwellinghouse. Conditions in full on our solar carport planning permission page.
Scotland. Class 9M, with its own limits and a straight exclusion for conservation areas — see the Scotland canopy guide. Wales. No canopy right exists; the Welsh stand-alone non-domestic solar right caps at 9 m² of panels, so a Welsh scheme is a planning application from the outset — see solar canopies in Wales.
Grid. Always G99. The Energy Networks Association's connection guides cap G98 at 16 A per phase — about 3.68 kW single-phase and 11.04 kW three-phase — so no commercial canopy falls inside the connect-and-notify route, regardless of what size threshold a supplier quotes. The application costs nothing to submit and is usually the critical path, which is the argument for lodging it as soon as an indicative capacity exists. The full sequence is on our solar panel canopies installation page.
Tax and rates
Capital allowances. Solar panels are special rate expenditure by statute — Capital Allowances Act 2001 s.104A(1)(g), with effect from April 2012 — so full expensing, which is for main-rate plant, does not apply. The Annual Investment Allowance gives 100% relief on the first £1 million of qualifying expenditure in the chargeable period; above that a 50% first-year allowance applies, with the balance in the special rate pool. Whether a canopy's steel frame is plant or a structure is genuinely unsettled, and it matters, because a structure may fall to the Structures and Buildings Allowance at 3% a year instead — our capital allowances explainer sets out why.
Business rates. Qualifying on-site renewable generation plant is excepted from rating valuations until 31 March 2035, but the land and settings remain rateable, above about 50 kW the supports and settings are valued, and no published guidance addresses a canopy's frame — detail on our solar canopy business rates page.
EV charging. Where the canopy carries chargepoints, the Workplace Charging Scheme contributes £500 per socket, up to 40 sockets per applicant, to 31 March 2027, with the education strand at £2,000 per socket; chargepoint plant also attracts a 100% first-year allowance to the same date. Doing it in the same project shares the groundworks and switchgear — see EV charging under a solar canopy.
Six claims to be wary of
| Claim you will see | What the source says |
|---|---|
| "Solar panel canopies cost £900–£1,400 per kWp." | No published UK dataset supports a band that tight. The one transparent figure is DESNZ's illustrative 80-space appraisal at about £140,000, which on a derived ~136 kWp implies roughly £1,000 per kWp — one illustration at one size with the government's own assumptions, not a market rate. |
| "Payback in 3.5 to 6 years." | Payback depends on the tariff you avoid, your self-consumption share, the foundation type and any parking revenue lost during construction. In the same DESNZ appraisal, foregone parking over a three-and-a-half-month closure was about £180,000 — larger than the £140,000 build. A single national payback figure cannot survive those variables. |
| "G99 applies above 50 kWp, so smaller canopies just notify." | G98 caps at 16 A per phase — about 3.68 kW single-phase and 11.04 kW three-phase. Every commercial canopy, at any size, is a G99 application needing the network operator's approval before installation. |
| "A canopy is permitted development." | In England, Class OA covers a canopy over off-street non-domestic parking but requires prior approval, with 56 days to determine, a glare assessment and a 4 m height cap. Scotland has Class 9M, which excludes conservation areas. Wales has no canopy right at all — its stand-alone right caps at 9 m² of panels. |
| "The canopy is exempt from business rates." | The generation plant is excepted from rating valuations until 31 March 2035, but the land and settings stay rateable, above about 50 kW the supports and settings are valued, and no published guidance addresses a canopy's steel frame. |
| "100% first-year tax relief." | Solar panels are special rate expenditure by statute — Capital Allowances Act 2001 s.104A(1)(g), from April 2012 — so full expensing does not apply. AIA covers the first £1 million of qualifying spend, then a 50% first-year allowance. |
Why no trustworthy per-kWp band exists for the UK at all, and how to normalise three quotations without one, is set out in why there is no reliable price list.
Several of those numbers were on this page until October 2026. They came from no source we could trace, so they are gone — and the claims table is here partly as a record of what was corrected.
Solar panel canopies: questions
What is a solar panel canopy?
A free-standing steel structure carrying solar modules above an open area — most often a car park, but also service yards, walkways and entrances. The vehicles or pedestrians keep using the space underneath while the deck above generates. Because the frame is yours to orientate, you set the pitch and azimuth rather than accepting whatever a roof happens to have, which is the one genuine performance advantage a canopy has over rooftop solar. The trade is that you are buying a structure and its foundations, which a roof gives you free.
How many solar panels fit on a car park canopy?
Work from the bay count. A standard UK parking bay is 2.4 m by 4.8 m, about 11.5 m²; a current 430 W module is roughly 1.13 m by 1.76 m, about 2 m². Six modules fit on area alone, but once you allow for beams, gutter lines, edge setback and maintenance access, about four modules per bay is the realistic planning figure — roughly 1.7 kWp per space. So 100 bays is in the order of 170 kWp. Any supplier quoting 3 kWp or more per bay is implying around eight modules over an 11.5 m² bay, which does not fit.
How much electricity will a solar canopy generate in the UK?
At the shallow 10-degree pitch a deck over parking bays needs, PVGIS models roughly 946 kWh per kWp a year in Cardiff, 920 in London, 875 in Birmingham, 807 in Manchester and 772 in Glasgow. A 170 kWp canopy over 100 bays therefore models at about 156,000 kWh a year in London and about 131,000 in Glasgow. The spread is close to 29%, so use the figure for your actual location rather than a national average.
Does a solar panel canopy need planning permission?
It depends on the nation. In England a canopy above off-street parking at a non-domestic site can proceed under Class OA of Part 14, introduced in December 2023 — but that is a prior approval route: the authority has 56 days, glare is assessed in every case, and the limits include 4 m maximum height and 10 m from the curtilage of a dwellinghouse. Scotland has its own right, Class 9M, which excludes conservation areas. Wales has no canopy right, because its stand-alone non-domestic solar right is capped at 9 m² of panels, so a Welsh canopy is a full planning application.
What does a solar canopy cost?
There is no reliable published price list for the UK, and a narrow per-kWp band presented as a market rate is an estimate wearing a suit. The one transparent figure comes from DESNZ, which costed an illustrative 80-space canopy at about £140,000 — roughly £1,000 per kWp on a derived 136 kWp. What moves a real quotation, in order: the foundations (decided by ground investigation, and the largest variable), the structural format and height, the grid connection and any reinforcement, the phasing, and surface reinstatement. The modules are the commodity line.
Is a canopy better than putting solar on the roof?
Per kilowatt installed, no — a roof is a mounting structure you have already paid for. A canopy earns its place when the roof route is unavailable or insufficient: a roof too small for the load you need to cover, too weak, with a shorter remaining life than the array, leased or listed, or already full. It also delivers covered parking and a ready platform for EV charging as part of the same capital project. If the roof is sound, spacious and yours, start there and use a canopy for the capacity the roof cannot carry.
Sources
All checked on 14 October 2026.
- European Commission PVGIS — yields at 10° tilt, crystalline silicon, 14% system loss
- DESNZ — solar canopies on new car parks consultation (illustrative 80-space appraisal)
- Energy Networks Association — G98 and G99 connection guides
- S.I. 2023/1279 (Class OA) and GPDO Schedule 2 Part 14
- Welsh Government — stand-alone non-domestic solar permitted development
- Capital Allowances Act 2001 s.104A — solar panels as special rate expenditure
- S.I. 2022/405 — renewables plant excepted from rating valuations
- OZEV — Workplace Charging Scheme
This is general information, not engineering, planning or tax advice. This site is published by SEO Dons Ltd; we are not an installer.
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