For many UK businesses, the car park is the largest open space on site. It’s also one of the least productive. It holds cars for part of the day, costs money to maintain, and otherwise does very little.
Solar carports change that. By building a canopy of solar panels over parking bays, a business can generate electricity from space it already owns, without touching the roof or giving up a single parking space. They’ve become a common sight at supermarkets, hospitals, business parks and distribution centres, and they’re increasingly being considered by smaller sites too.
They’re not the right answer for everyone, and they come with more design and construction decisions than a typical rooftop system. Here’s what’s involved.
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Why businesses choose carports over rooftop solar
The most common reason is simple: the roof won’t work. It might be too small, too shaded, structurally unable to take the load, or due for replacement. Some buildings are leased, and the landlord won’t allow panels on the roof. Others have roofs already covered in plant equipment, rooflights or ventilation.
In these cases, the car park offers a way to go ahead with solar without the roof becoming a barrier. For sites with a large car park and a modest roof, a carport can also generate considerably more power than the building alone could.
There are other benefits that are easier to overlook. Vehicles parked underneath stay cooler in summer and free of frost and snow in winter. Staff and visitors get shelter walking to and from their cars. And a solar canopy is highly visible, which matters to businesses keen to show customers, staff and investors that they’re taking sustainability seriously.
The natural partner for EV charging
The biggest shift in the case for solar carports has come from electric vehicles. Businesses installing charge points for staff, fleets or customers are adding a significant new electricity demand, often concentrated in the car park itself.
A carport puts generation right where that demand sits. Cabling for charge points can be routed through the canopy structure, which is usually far simpler and cheaper than trenching across the car park. During the day, the panels can supply chargers directly, reducing how much power you need to draw from the grid.
Adding a battery can help smooth out the mismatch between when the sun shines and when vehicles plug in, and it can reduce the strain on your grid connection when several chargers run at once. For sites where the existing connection is already close to its limit, that can make the difference between installing a handful of chargers and installing enough to meet demand.
If EV charging is part of your plans, even a few years from now, it’s worth designing the carport with that in mind from the outset. Adding ducting and cable routes during construction costs far less than retrofitting them later.
What makes carports more complex than rooftop solar
A rooftop system uses a structure that already exists. A carport means building a new one. That’s the main reason carports typically cost more per kilowatt than rooftop solar, and it’s why the design stage deserves proper attention.
Ground conditions and foundations. Every canopy needs foundations, and the right type depends on the soil and what lies beneath the surface. A ground investigation is usually needed, and it’s important to locate underground services such as drainage, water mains and power cables before any digging starts. An unexpected cable run can force a redesign or add significant cost.
Headroom. Standard car parking needs enough clearance for cars and taller SUVs, but if vans, minibuses, delivery vehicles or emergency vehicles use the space, the canopy needs to be higher. Taller structures cost more and face stronger wind loads, so it’s worth thinking carefully about which bays genuinely need extra height.
Layout and design. Carports come in several forms. Single-pitch canopies tilt in one direction and suit single rows of bays, while dual-pitch or butterfly designs cover two rows back to back. The right choice depends on your car park layout, the orientation of the bays and how much generation you’re aiming for. The column positions also need to work with parking bays, door opening space and vehicle movements.
Drainage. A large canopy collects a lot of rain. That water needs to go somewhere, and it shouldn’t pour onto people getting into their cars. Well-designed carports include guttering and downpipes that connect to the site’s existing drainage, or to rainwater harvesting where that makes sense.
Lighting and safety. Canopies change how light falls across a car park, and areas underneath can feel darker in the evening. Integrated LED lighting is common and worth including in the design. Columns near traffic routes should also be protected against vehicle impact.
Planning permission
Planning rules for solar carports have been changing. In England, some car park solar canopies can now go ahead under permitted development, but there are conditions on height, siting and proximity to homes, among other things. Many larger or more prominent schemes still need a full planning application, and the rules differ in Scotland, Wales and Northern Ireland.
It’s sensible to raise planning at the first meeting with any installer and to check with your local planning authority before committing to a design. Sites near residential properties, in conservation areas or with listed buildings nearby will generally need more careful handling.
Managing disruption during construction
A carport project takes part of your car park out of use while work is underway. For a busy site, that needs planning.
Most installers will phase the work so that only a section of the car park is closed at any one time. It helps to agree the phasing, working hours and any alternative parking arrangements before work starts, and to let staff and visitors know well in advance. Sites that operate around the clock, such as hospitals and distribution centres, often need particularly careful scheduling.
Costs, tax and funding
Because of the steelwork and foundations, carports cost more than rooftop systems of the same size. Against that, they can unlock generation that wouldn’t otherwise be possible, they add value through shelter and EV integration, and they have a long working life.
The tax position is worth checking with your accountant before you commit. The electrical equipment and the canopy structure may be treated differently for capital allowances, which can affect the first-year figures more than many businesses expect.
Asset finance, leasing and Power Purchase Agreements can all be used for carport projects. A PPA, where a third party funds and owns the system and you buy the electricity it produces, can suit businesses that want the benefits without a large upfront outlay.
Getting the design right from the start
The carport projects that deliver the best results tend to have one thing in common: everything was considered together from day one. Parking layout, EV charging plans, battery storage, lighting, drainage and grid capacity all interact, and changing one later can mean costly rework on the others.
When speaking to installers, look for experience with structural and civil works as well as solar. Ask to see completed commercial solar carports and how they handled ground investigations, planning and phased construction. A good proposal should show clearly how the canopy fits your site, your vehicles and your plans for the next ten to twenty years, not just how many panels it can hold.
