What Are Solar Carports? A UK Commercial Guide

What is a solar carport? A plain definition

A solar carport is a freestanding, engineered steel structure erected over a car park, with solar photovoltaic (PV) panels mounted on its canopy roof. It does two jobs at once: it shelters parked vehicles from rain, hail and sun, and it generates clean electricity from the panels overhead. Unlike a domestic carport, a commercial solar carport is a substantial structure spanning dozens or hundreds of bays, engineered to wind and snow loads under UK building regulations. The key idea is that the car park is the generating asset, so no rooftop or greenfield land is needed. As a rough rule of thumb, each parking bay supports around 1.5 kWp of solar capacity, so a 200-bay car park can host roughly 300 kWp. That makes solar carports one of the most space-efficient ways for a business to add on-site renewable generation while keeping the land working as parking.

How a solar carport works

The principle is the same as any solar PV system, just mounted overhead. Sunlight hits the panels on the canopy, which convert it into direct-current (DC) electricity. An inverter converts that DC into alternating current (AC) that matches your building's supply, and the power flows first to on-site demand, such as lighting, refrigeration, machinery or EV chargers. Any surplus is exported to the grid, typically earning income through a Smart Export Guarantee (SEG) tariff. Because most commercial sites consume power during daylight working hours, a high share of carport generation is used on site, where it displaces grid electricity at commercial rates of around 45 to 50p/kWh, far more valuable than the export price. Bifacial panels, which also capture light reflected off the tarmac and surroundings beneath them, can add roughly 5 to 12% extra yield, a meaningful uplift over a 25-year-plus asset life.

The main components of a solar carport

A commercial solar carport is made up of a handful of core elements. The steel substructure (columns and beams) carries the canopy and is foundation-fixed, usually on concrete pads or, on some sites, ground screws that avoid large excavations. The canopy roof holds the solar panels at a fixed tilt, doubling as weather protection and, often, integrated guttering and lighting. The PV panels themselves, increasingly bifacial, generate the power. Inverters convert DC to usable AC, and the balance of system (cabling, isolators, mounting, monitoring) ties it together and connects to your distribution board. Crucially, modern installs include EV-ready DC stubs run in at build stage, so chargers can be added later without digging the car park up again. The whole system is metered and monitored so you can track generation, consumption and export in real time.

Carport vs canopy vs rooftop vs ground-mount: the differences

These terms get used loosely, so it helps to separate them. A solar carport and a solar canopy are essentially the same thing, a panel-topped structure over a car park, though "canopy" is sometimes used for shade structures over walkways or seating as well as vehicles. The bigger distinction is against the alternatives. Rooftop solar uses your existing building roof, which is cheapest per kWp but limited by roof size, age, orientation and structural capacity. Ground-mount solar sits in a field and is land-hungry, often a non-starter on commercial sites. A solar carport costs more per kWp than rooftop because you are also buying a steel structure, but it unlocks generation where you have no spare roof, adds genuine value (weather protection and EV charging) and uses space you already own. For many car-park-heavy sites, retail parks, hospitals, offices and logistics depots, it is often the only viable way to deploy solar at scale.

Costs and payback at a glance

Commercial solar carports typically cost around £950 to £1,300 per kWp installed, with the exact figure depending on bay layout, ground conditions, foundation type and grid connection. Because each bay supports around 1.5 kWp, you can size a project quickly from the parking count. A representative 200-bay scheme of roughly 300 kWp works out at around £290k to £390k turnkey. At commercial electricity prices of around 45 to 50p/kWh, a project of that scale can save on the order of £110k to £125k per year, giving a typical simple payback of around 4 to 7 years, potentially falling to roughly 3 to 4 years once the Annual Investment Allowance (100% first-year tax relief) is applied. The table below shows typical figures; treat them as estimates to be confirmed by a site survey.

Planning, grants and grid connection

In the UK, a commercial solar carport almost always needs full planning permission under the Town and Country Planning Act 1990, determined by the local council, usually within 8 to 12 weeks. A well-prepared application, with structural, drainage and visual-impact detail, gives the best chance of a smooth approval. Several funding routes can improve the numbers further. The Public Sector Decarbonisation Scheme (PSDS) can fund eligible GB public-sector bodies, with Salix loans and grants supporting the sector too. The Annual Investment Allowance gives businesses 100% first-year tax relief on up to £1m of qualifying spend. For EV charging, the OZEV Workplace Charging Scheme contributes a grant per socket (typically up to £350) on a capped number of sockets. Government policy is also pointing in this direction: in 2025 ministers proposed and consulted on requiring solar canopies over larger new car parks, though this is a proposal rather than enacted law. On the grid side, larger projects need a connection agreement with your Distribution Network Operator (DNO), which is worth scoping early as it can affect timelines.

Who solar carports suit, and how to get started

Solar carports make most sense for organisations with large car parks and high daytime electricity use: retail and business parks, supermarkets, hospitals and NHS sites, universities and colleges, logistics and distribution centres, manufacturing plants, hotels and local authority estates. They are especially compelling where the roof is unsuitable or already full, where EV charging is on the roadmap, or where parking is a visible, customer-facing asset that benefits from shade and a green statement. They also help with compliance pressures such as MEES (Minimum Energy Efficiency Standards) and corporate net-zero targets. As MCS Certified and NICEIC Approved specialists, we handle the full journey, feasibility, design, planning, DNO and installation, with EV-ready provision built in from day one. The best first step is a free feasibility assessment based on your bay count, energy bills and site layout. Request a quote to get a tailored estimate of cost, savings and payback for your car park.