Commercial solar canopy — FAQs
Honest answers to the questions UK businesses ask about car park canopies. Last updated for 2026.
What is a commercial solar canopy?
A commercial solar canopy is an engineered free-standing steel structure — typically over a car park, walkway, or open paved area — that carries solar PV modules as its roof. Unlike rooftop PV, a canopy doesn't depend on the host building's structure or roof condition. Canopies range from 30 kW single-bay carports through to multi-megawatt installations spanning hundreds of bays at supermarkets, retail parks, and hospitals.
How much does a commercial solar canopy cost?
Installed cost is typically £900–£1,400 per kWp depending on scale, ground conditions, and EV charging integration. A 100 kWp canopy (about 22 bays) is £100,000–£140,000; a 500 kWp canopy is £450,000–£650,000; a 2 MW double-cantilever array is £1.8m–£2.6m. Foundations, ground conditions, and architectural finishes are the main cost drivers.
Do I need planning permission for a solar canopy?
Often yes in England, but not automatically. A canopy over off-street non-domestic parking can use permitted development Class OA of Part 14 of the GPDO (in force since 21 December 2023), which always needs prior approval from the local planning authority and caps the height at 4 m above ground; taller structures, listed-building curtilage and some other sites need a full planning application. Scotland (Class 9M) and Wales (a 9 square metre limit for stand-alone non-domestic solar) differ.
Can I integrate EV charging into a solar canopy?
Yes — EV-integrated canopies are now a common configuration. Typical choices are 7 kW AC, 22 kW AC, or 50–150 kW DC chargers under the canopy, wired through the same private network, with OCPP back-office providers like Monta, Pod Point, Mer, or Allego run the chargepoint network. The OZEV Workplace Charging Scheme grant (£500 per socket since 1 April 2026, up to 40 sockets, scheme ends 31 March 2027) covers part of the EV cost.
How long does a solar canopy installation take?
Typical project timelines: 4–6 weeks for design and planning approval; 6–8 weeks for procurement and DNO consent; 4–14 weeks on site depending on size. For a 100 kWp canopy that's 4–5 months end-to-end; for a 1 MW double-cantilever array, 7–9 months. Work is usually phased in rows so the car park stays operational.
What is the payback on a commercial solar canopy?
Capital purchase paybacks are typically 7–9 years for canopies, versus 4–6 years for rooftop PV. The longer payback reflects the higher £/kWp from steel structure and foundations. EV-integrated canopies typically pay back faster due to chargepoint revenue. PPA structures deliver day-one positive cash with no capital outlay.
Can a solar canopy be combined with rainwater harvesting?
Yes. Integrated downpipes and gutter systems are a standard option. Harvested rainwater can feed irrigation, vehicle wash, or non-potable site uses. Rain harvesting sometimes contributes to BREEAM credits and SuDS planning compliance.
How does a solar canopy connect to the grid?
Through a G99 grid connection agreement with the local DNO. G98 covers only up to 16 A per phase (about 3.68 kW single-phase, 11 kW three-phase), so every commercial canopy is a G99 connection. The application, the technical study and the metering installation are normally handled by the installer. The DNO timeline is 11–24 weeks at the moment, so apply early and run consents in parallel with construction.
Four common objections, answered
“A canopy costs more per kWp than putting panels on the roof.”
Correct — roughly £900–£1,400/kWp against £700–£900 on a sound roof. A canopy is the right answer when the roof is unusable (asbestos, weight limits, lease, end-of-life) or already full, when you need EV charging anyway, or when the car park is simply bigger than the roof. If your roof is sound and spacious we will tell you to use it first.
“We will lose parking spaces during the build.”
Works are phased row by row, so a minority of bays are out of use at any one time rather than the whole car park. Foundations are the disruptive stage; ground screws avoid concrete curing entirely where ground conditions allow. The programme is sequenced around your operational calendar.
“Planning will kill it.”
Most commercial car-park canopies proceed under Permitted Development. Conservation areas, listed-building curtilage and highway-facing frontages are the genuine exceptions, and an installer assesses which applies before any design spend — so you find out early, not after paying for drawings.
“The savings figures never survive contact with reality.”
The figures on this site are stated as ranges, not single hero numbers, and we publish the assumptions behind every one (yield per kWp, self-consumption share, tariff) so you can challenge them. Ask any installer to model savings from your own half-hourly consumption data and to size the system to what the site will actually use.