solar carport installation in Cardiff

Serving Cardiff and the wider South Glamorgan area, including Penarth, Caerphilly, Barry.

Why a solar carport install suits Cardiff commercial sites

Cardiff runs on car parks. From the retail decks around St David’s to the surface lots serving Cardiff Bay Business Park, Capital Business Park and the Wentloog Industrial Estate, the city has thousands of exposed bays sitting idle in daylight while the buildings behind them pull expensive grid power. A solar carport installation puts that dead space to work. A steel canopy over the bays generates electricity, shelters vehicles, and creates covered points for EV charging, all without costing a single parking space.

For a Cardiff facilities or estates team, the appeal is behind-the-meter generation. A mid-sized commercial site here spends in the region of £38,000 a year on electricity, and much of that load — lighting, chillers, IT, machinery — runs through the working day, exactly when a canopy produces most. Every unit generated on site and used on site is a unit not bought from the grid. Cardiff Council has set a net-zero ambition for 2030 under its One Planet Cardiff programme, well ahead of the UK’s 2050 statutory date, and the Welsh Government has committed the wider public sector to net zero by 2030 as well. For organisations bidding into that supply chain, on-site renewable generation is increasingly a procurement question, not only an energy-cost one.

The sites that suit a solar carport install best are the ones with large, flat, unshaded parking: business-park units off the A48 and A4232, distribution yards around Pengam Green and Hadfield Road, supermarket and retail-park decks, hospital and leisure-centre car parks, and park-and-ride sites feeding the city. If you can see the Principality Stadium floodlights over a sea of tarmac, you are probably looking at a viable canopy.

Planning permission in Cardiff — the Welsh position

This is where Cardiff differs sharply from England, and it is the single most important thing to get right. In England a permitted-development right (Class OA, in force since December 2023) lets many freestanding solar canopies proceed under a lighter prior-approval process. That right does not exist in Wales. In Cardiff, a solar carport installation generally needs full planning permission, decided case by case by Cardiff Council as the local planning authority.

Because full permission is required, budget realistic time. A straightforward Cardiff application often runs eight weeks or more to determination, and longer where it touches a conservation area, a listed setting such as Cardiff Castle, Llandaff or the civic buildings around Cathays Park, or a flood zone near the Taff or the Bay. Surface-water drainage will need to be addressed, and in Wales sustainable drainage (SuDS) approval from the council’s SuDS Approving Body can apply to the groundworks, so treat it as part of the consent package rather than an afterthought.

One more Welsh-specific point on the numbers: the business-rates exemption for eligible solar plant that applies in England until 31 March 2035 does not extend to Wales. A Cardiff scheme should not assume rates relief on that basis. This is a standing planning process, not a closing window — any installer pressing false urgency on a planning technicality is selling, not advising.

The grid connection — National Grid Electricity Distribution and G99

Cardiff sits in the licence area of National Grid Electricity Distribution (South Wales), the regional DNO, and any solar carport install of meaningful size has to be agreed with them before it can energise. This is usually the longest single item in the whole programme.

The rule of thumb: a system up to 3.68 kW per phase can use the G98 “fit and inform” route, where you connect and then notify. Almost every commercial carport is larger than that, so it falls under G99, which requires the DNO to approve the connection before installation. G99 sign-off on a commercial site commonly takes eight to sixteen weeks, and on a constrained part of the South Wales network it can run longer while capacity is assessed or reinforcement is priced. The practical lesson for a Cardiff project is to submit the G99 application as early as possible, in parallel with the planning application, so the grid clock and the planning clock run together rather than end to end.

How a Cardiff solar carport install runs, step by step

A well-run install moves through six stages: survey, design, consents, groundworks, steel, then commissioning.

1. Survey. A site visit records the bay layout, orientation, existing drainage and the incoming supply, backed by trial holes or a geotechnical desk study to understand what sits under the tarmac.
2. Design. Canopy layout, structural calculations, the electrical single-line design and a generation model tuned to Cardiff’s yield.
3. Consents. The full planning application to Cardiff Council, the G99 application to National Grid Electricity Distribution, and any SuDS drainage approval — all run in parallel to save calendar time.
4. Groundworks. Excavation and foundations. This is the messiest and most site-specific phase, and the one ground conditions swing hardest.
5. Steel. The canopy frame is erected, usually over a live-managed car park in phases so bays stay available to the site.
6. Commissioning. Panels, inverters and metering go in, are tested and signed off, and the DNO receives or witnesses the commissioning evidence before the system runs in parallel or exports.

Foundations and ground conditions across Cardiff

Ground conditions decide a large part of the cost, and Cardiff’s are varied. Much of Cardiff Bay and the areas around the former docks (CF10, CF24) sit on reclaimed and made ground, where fill, old wharf structures and a high water table can push you towards deeper piled foundations rather than simple concrete pads. The Wentloog levels east of the city (CF3) are low-lying reclaimed marshland with soft alluvial soils and drainage constraints. By contrast, sites on the higher ground to the north around CF14 and CF23 tend to sit on firmer bearing strata.

This matters because carport foundations carry not just dead weight but wind uplift on a large canopy. On good ground, pad footings may be enough. On made or soft ground, screw piles or bored piles are common, and they add cost. A geotechnical survey taken early — before the design is fixed — is the cheapest way to avoid a nasty surprise once the excavators arrive. Any installer quoting a firm foundation price for a Cardiff Bay site without ground data is guessing.

What a solar carport install costs in Cardiff

Carports cost more than rooftop solar because you are buying a building as well as a power system. As a planning guide, expect the steel structure alone to account for roughly 40 to 50 per cent of the total. At scale, a Cardiff solar carport install typically lands around £1,100 to £1,600 per kWp; smaller schemes sit higher, around £1,200 to £3,000 per kWp. Per parking space, a useful budgeting figure is roughly £6,000 to £12,000 ex VAT. For comparison, rooftop commercial solar runs about £700 to £1,050 per kWp, so a carport is broadly two to three times the cost of the equivalent roof array, with covered parking and an EV-ready structure as the offset.

Quote commercial carports ex VAT. The 20 per cent VAT is generally recoverable for a VAT-registered business, so it is not a true cost, and the 0 per cent VAT rate you may have read about is a residential measure only (running to 31 March 2027, then 5 per cent) that does not apply to commercial installs. On capital allowances, solar PV is special-rate plant: a company can typically use the £1m Annual Investment Allowance for 100 per cent first-year relief, or the 50 per cent first-year allowance on qualifying spend above that. Solar does not qualify for full expensing. And, as above, the England business-rates exemption for solar does not apply in Wales. Tax treatment depends on your circumstances, so take your own tax advice.

Generation and payback should be modelled, never guaranteed. UK yield sits around 900 to 950 kWh per kWp a year, so a canopy of roughly 2 kWp per bay produces on the order of 1,700 to 2,000 kWh per bay annually, with the real figure driven by orientation, shading and the specific design. Solar-only payback commonly lands around eight to ten years, and shortens where you self-consume most of the output or pair the canopy with EV charging. If you are adding chargers, the Workplace Charging Scheme can contribute £500 per socket (up to £2,000 per socket for state-funded education), capped at 75 per cent of cost and 40 sockets, and running to 31 March 2027. For current export tariffs and worked savings figures, see our national cost page rather than any headline rate quoted here.

Cardiff postcodes and areas we cover

We install solar carports across the Cardiff postcode districts: CF10 and CF11 in the centre and the Bay, CF24 around Adamsdown and Roath, CF14 to the north through Llanishen and Heath, CF23 to the north-east around Cyncoed and Pontprennau, CF3 out to Rumney, St Mellons and the Wentloog estates, and CF5 to the west through Canton, Ely and Culverhouse Cross. Named candidates we look at regularly include Cardiff Bay Business Park, Capital Business Park, the Hadfield Road retail and trade area, Pengam Green, and the Wentloog Industrial Estate.

We also cover the wider travel-to-work area — Penarth, Barry, Caerphilly, Pontypridd and Newport — plus neighbouring cities including Newport and Swansea, where the same Welsh planning position applies, and Bristol across the Severn in England, where the English Class OA prior-approval route is available instead.

Get a quote for your Cardiff solar carport

If you manage a car park anywhere in Cardiff and want to know whether a solar carport install stacks up, request a quote. Send us the bay count, a site postcode and a rough idea of your daytime electricity use, and we will come back with an indicative canopy size, a generation estimate modelled on Cardiff’s yield, and a per-space cost — ex VAT, with the G99 and planning timeline built in. If a site does not suit a canopy, we will say so plainly rather than sell you one. Start your no-obligation quote and we will take it from there.