France didn’t ask its car park owners nicely. It passed a law. Since 2023, under the loi APER (Accélération de la Production d’Énergies Renouvelables), any outdoor car park of 1,500m² or more has to be at least 50% covered by solar canopies — or face fines running to €40,000 a year for the biggest sites. The first compliance deadline, for lots over 10,000m², lands on 1 July 2026. The UK, by contrast, spent a year drafting the same idea and then quietly binned it.
That’s not a throwaway line — it’s the story. In May 2025, the Department for Energy Security and Net Zero (DESNZ) opened a call for evidence on solar canopies for new car parks, floating a mandate that echoed France’s. By May 2026, Bloomberg was reporting the plan had been shelved over cost concerns, with DESNZ concluding the mooted rule risked landing badly on car parks of wildly different sizes, grid connections and ownership structures. Ed Miliband’s “car parks into solar car ports” soundbite from 2025 quietly became a policy that isn’t happening — at least not by regulation.
For the trade, that’s worth sitting with. It means the UK solar carport opportunity is now a commercial-economics story, not a compliance story. Nobody has to build one. Which means every one that gets built from here has to make its own financial case — and understanding that case, project by project, is where the next few years of specialist installer and EPC work sits.
What France actually mandated — and why it worked as a market-maker
The French law isn’t subtle. Outdoor car parks of 1,500m² and above (roughly 80+ spaces, depending on layout) must fit solar canopies over at least half the parking area, generating power either for on-site use, export, or EV charging infrastructure. Non-compliance carries penalties of up to €20,000/year for parks up to 10,000m², rising to €40,000/year above that, applied annually until the site complies. Existing car parks get until 2028; new-build car parks over 10,000m² face a 2026 deadline that’s already concentrating minds among French retailers, logistics operators and public-sector estates.
What that mandate did — deliberately or not — was force a supply chain into existence almost overnight. Canopy fabricators, structural engineers used to designing for wind and snow load over asphalt, EV-integration specialists and O&M contractors all had to scale in a compressed window, because the alternative was a repeating annual fine. The UK never got that forcing function. DESNZ’s partial response to the consultation addressed EV charging infrastructure but left the core solar canopy mandate unresolved, and by spring 2026 it had been dropped altogether. The upshot: UK installers chasing this market are selling a discretionary capital project against payback and resilience, not a compliance deadline with a fine attached. Harder sell, but arguably a more durable one — nobody rips out a canopy that’s saving them £20,000+ a year once the mandate pressure (real or feared) has gone.
The size of the prize, mandate or no mandate
The underlying resource hasn’t gone anywhere. A widely cited industry study put the UK’s addressable business-owned car park estate at roughly 629,000 bays capable of hosting solar carports — good for around 1.57GW of new capacity and 1.4TWh of generation a year. Separately, Energy Systems Catapult modelling has suggested up to 24GW of theoretical capacity across publicly controlled car parks alone, and DESNZ’s own figures floated a conservative 11GW unlocked under a France-style regime — a meaningful slice of the UK’s 45–47GW solar-by-2030 target on its own.
Retail and service-station forecourts illustrate the scale at the smaller end: analysis of 151 UK service stations found roughly 46,000 suitable parking spaces capable of generating around 124GWh a year between them. At the site level, DESNZ’s own worked example — an 80-space car park — put potential savings at up to £28,000 a year where the generated power is consumed on-site rather than exported. That’s the number worth remembering when a client asks “why would I bother without the government making me?” The answer was never really about the government.
The £/kWp premium — and why it’s not the whole story
Solar carports cost more per kWp than a comparable rooftop or ground-mount array, and it’s worth being upfront about that with clients rather than letting a competing quote on a warehouse roof look cheap by comparison. A carport needs a free-standing steel or aluminium structure engineered to hold panels 2.5–3m clear of vehicles, rated for UK wind and snow loading, plus (usually) new cabling runs, structural foundations set into or bored through the existing car park surface, and — increasingly — EV charge point integration and sometimes battery storage bolted on to smooth demand spikes. Ground-mount commercial solar in the UK is typically running around £900–£1,200/kWp installed; carports carry a premium on top of that for the structural steel alone, before EV hardware and any grid reinforcement is added, which is exactly the “astronomically expensive” cost profile DESNZ’s own consultation flagged as the mandate’s fatal flaw.
The economics work anyway, for the right site, for three reasons specialists should be leading with:
- Dual land use. The car park was already paying for itself as a car park. Every kWp installed above it is incremental generation on land the business would be paying business rates and maintaining regardless — no competing land-use cost the way a greenfield ground-mount sometimes carries.
- Load-matching with EV charging. Fleet depots, retail parks and workplace car parks increasingly need EV charging infrastructure anyway. Pairing the canopy with charge points means the most expensive part of the electricity bill — daytime EV charging — gets offset directly by daytime generation, which is the single strongest ROI lever in this category. For businesses weighing that pairing seriously, Commercial Solar EV is a useful specialist reference point on how the two technologies are increasingly specified together.
- Shading and asset protection as a secondary benefit. Covered parking is itself a saleable amenity — reduced vehicle heat damage, weather protection for staff and customers, EV charging under cover. On a pure kWh-generated basis a carport rarely beats a warehouse roof; once the parking amenity and EV synergy are priced in, the comparison changes.
For a UK-wide breakdown of what commercial solar costs by building type and roof versus ground-mount versus carport structures, Commercial Solar Cost UK is a good starting reference for clients sense-checking quotes, and Solar Panels for Commercial Property covers the landlord/multi-let angle that often applies to retail park and business park car parks specifically.
Who’s actually building these in the UK right now
Absent a mandate, the sites that pencil out first are the ones where the car park was always going to need capital spend anyway — a resurfacing project, an EV charging rollout, a new-build retail or logistics development — and the canopy gets bolted on to an already-justified structural budget rather than standing alone as a discretionary solar project. That’s the pattern worth watching for the rest of 2026: fewer standalone “let’s solar our car park” instructions, more “we’re doing the car park anyway, spec the canopy into it.”
Solar Car Parks is tracking this specifically as a UK niche — worth a look for anyone benchmarking canopy specifications, structural approaches or the EV-integration detail that separates a good carport quote from a generic ground-mount one repackaged with taller legs. For businesses further along and weighing canopy structures specifically against other commercial formats, Commercial Solar Canopy and Solar Panels for Car Parks both go deeper into structural specification and site suitability than most general commercial solar content does — useful reading before a first site survey.
On the installer side, this is squarely commercial/C&I territory rather than domestic, so it tends to sit with firms already doing larger rooftop and ground-mount work rather than residential specialists. EC Eco Energy in Essex has commercial solar and battery experience that extends naturally into car park and forecourt projects across East Anglia, while D&R Energy in Bristol works the commercial end of the South West market where retail parks and logistics sites are increasingly asking the carport question. Both are the kind of installer profile — comfortable with structural engineering sign-off, DNO applications and larger contract values — that a carport project actually needs, as distinct from a residential-scale team bolting panels to a bungalow roof.
What happens next
Don’t expect DESNZ to let this go entirely quiet. The consultation response left the door open to revisiting canopy requirements once EV chargepoint rollout — the bit that did survive — is further along, and France’s 2028 deadline for smaller car parks will keep providing a visible before-and-after case study that UK campaigners can point to. If French retail chains with UK operations start reporting real savings data from their mandated canopies over the next 18 months, that’s the kind of hard number that tends to resurface stalled UK policy.
In the meantime, the market that does exist is smaller than a mandate would have created, but arguably healthier — every UK carport going up now is doing so because the numbers stack up on their own, not because a compliance deadline forced the spend. For installers building a specialism here, that’s a better sales conversation to be having than the one France’s operators are having with their regulator. Understanding the underlying cost breakdown properly — before quoting — still starts with the basics; Cost of Solar Panels UK and Commercial Solar Panel Costs are useful baselines for scoping the standard commercial installation before layering carport-specific structural costs on top, and Solar Panels for Warehouses is worth cross-referencing for sites weighing roof-mount against canopy where both are physically viable.
The UK didn’t get France’s stick. It still has the same car park estate, the same EV-charging tailwind and, for the sites where the numbers work, largely the same economics. That’s a market to build carefully rather than wait for regulation to build for you.