Solar Canopies: Generation Over the Bays It Charges
When the roof is shaded, leased, fragile or full, the car park is the site's second solar resource — and putting the array directly above the charging bays has an engineering elegance the numbers increasingly support.
When a canopy beats a rooftop
Rooftop solar is cheaper per kWp and stays cheaper — a canopy is the right call in specific situations rather than by default. The recurring cases: the building roof is structurally marginal, asbestos-clad or already crowded with plant; the building is leased while the car park sits inside the demise (or vice versa, with a cleaner consent path over the parking); charging demand is concentrated in the car park and the canopy serves generation, weather protection and charger mounting in one structure; or the estate simply needs more generation than the roof can carry. Where the roof is viable, we usually recommend filling it first and treating the canopy as expansion capacity — the combined business case maths favours cheap kWp before elegant kWp.
The structures and the numbers
Commercial canopies are galvanised steel portal structures spanning two parking rows (a double-row module covers 4–6 bays), with monopitch PV at 5–10 degrees. Each covered bay hosts roughly 2–2.5kWp of generation. Installed pricing in 2026 runs £1,400–£2,000 per kWp all-in — structure, foundations, PV, DC/AC electrical — with ground conditions the biggest swing: clean foundations in firm ground price at the low end, while poor ground, buried services or extensive drainage diversion push the top. A 40-bay scheme (~90kWp) typically lands between £135,000 and £175,000 before charger hardware, generating 75,000–85,000kWh a year directly above the vehicles consuming it.
Planning and consents: the honest picture
Canopies are new structures; expect a planning application rather than permitted development in most cases. The good news is that applications combining EV infrastructure and renewables on existing hardstanding are policy-aligned almost everywhere, and refusals are rare when neighbour amenity (overshadowing, lighting) is handled in the design. Programme 8–13 weeks for determination, run the electrical design and DNO engagement in parallel, and the planning clock stops being the critical path. Listed settings and conservation areas need earlier conversations — same as any structure.
Integration with charging: where the design earns its fee
The canopy project done well is one electrical system: PV strings overhead feeding inverters on the structure, chargepoints mounted on canopy legs metres from the load, one DC/AC architecture, one metering layer, one load-managed connection back to the site distribution. Trenching shrinks to a single spine run; charger foundations vanish into the canopy bases; and solar-following charging operates at its theoretical best because generation and load share a postcode measured in metres. Specify OCPP chargers and dynamic load management exactly as for any charging project — the canopy changes the geometry, not the logic.
The amenity dividend
Unusually for energy infrastructure, canopies are popular with the people under them: covered parking in British weather, marked-out charging bays, better lighting integrated into the structure. Retail and hospitality sites report the covered bays become the most-used in the car park, charging or not. It is not a line for the payback model — but it is one more reason canopy schemes clear boards that flat economics alone might not.
Solar canopy questions
What does a solar canopy cost compared to rooftop solar?
Roughly £1,400–£2,000 per kWp installed in 2026, versus £650–£1,100 for rooftop — the premium buys steel structure and foundations. Per parking bay (two bays per structural module is typical) think £8,000–£14,000 including the PV. The canopy makes sense where the roof can't host the array, where charging is concentrated in the car park anyway, or where the asset doubles as covered parking with real amenity value.
Do solar canopies need planning permission?
Usually yes — unlike most rooftop solar, a canopy is new structure and typically falls outside permitted development. Applications are generally well received: councils see EV infrastructure plus renewables on already-developed land. Allow 8–13 weeks for determination and engage early where the car park borders residential property. Ground conditions and drainage feature in the application alongside the structure itself.
How many bays do we need to cover to make it worthwhile?
Viability usually starts around 10–12 covered bays (roughly 40–50kWp). Below that, fixed costs — design, foundations mobilisation, DNO work — dominate and a rooftop or ground-mount alternative deserves a look first. The sweet spot for SME sites is 20–60 bays; retail and logistics sites scale into the hundreds, where canopy pricing approaches mid-range rooftop per-kWp rates.
Can chargers mount directly on the canopy structure?
Yes, and they should — charger integration is one of the canopy's quiet wins. Mounting chargepoints on canopy legs eliminates separate charger foundations and shortens cable runs to a few metres; DC cabling from panels to inverters stays overhead. The result is a tidier site, less trenching, and a car park that visibly explains itself to staff and visitors.