500kW Solar Carport Cost UK (2026)

Cost item	Typical range (500 kWp / ~250 bays)	What is included
Steel structure and foundations	£200,000-£315,000 (~45% of total)	Galvanised steel frame engineered to Eurocode 1 (BS EN 1991) for wind and snow, plus ground-screw, ballasted or driven-pile foundations. The single biggest line, and the reason bigger car parks cost less per kWp.
PV modules and mounting	£110,000-£170,000	~1,100 x 450W panels (mono or bifacial), rails and clamps. Bifacial adds 5-12% generation for a modest uplift.
Inverters, cabling and electrical	£70,000-£120,000	String or central inverters, AC/DC cabling, isolation, metering and protection, all to BS 7671.
DNO grid connection (G99)	£15,000-£60,000+	G99 pre-approval and connection works for a scheme this size. Cost and lead time (typically 4-8 weeks) vary by network and available capacity.
Design, planning and site works	£25,000-£55,000	Structural design, glare/glint study, SuDS drainage strategy, Class OA prior-approval, CDM 2015 management, groundworks and reinstatement.
Optional: EV charging and battery	£20,000-£90,000+	7-22kW AC charge points, lighting and (optionally) battery storage. Shortens payback and lifts self-consumption. Not standalone 50kW+ DC rapids.
Total installed (turnkey)	£450,000-£700,000	Structure, PV, electrical and DNO connection under one contract at ~£900-£1,400/kWp, or roughly £6,000-£12,000 per bay depending on layout and site.

A 500kW solar carport is a large-scale commercial scheme — roughly 250 parking bays turned into a generating asset. At this size you are in the most efficient part of the cost curve, but you are still buying a substantial engineered steel structure as well as the panels, so the maths works differently from a rooftop array. This page gives you the honest numbers for the UK in 2026: total price, cost per kWp, cost per bay, what it generates, a worked payback, and how tax relief and planning change the return.

What a 500kW solar carport costs

At commercial scale, elevated solar canopies run £900-£1,400 per kWp installed. A 500 kWp scheme therefore costs roughly £450,000-£700,000 as a turnkey install. Because a 500kW system is large, it tends to sit toward the lower half of that band — the fixed engineering cost is spread across a lot of capacity — but ground conditions, structure type and grid works decide exactly where you land.

Per bay, expect roughly £6,000-£12,000 installed. A standard bay carries about 2 kWp (four to six 450W panels over roughly 12 m²), so ~250 bays gives you ~500 kWp. For comparison, a rooftop array of the same capacity would cost £700-£1,050/kWp — the difference is the structure you are paying for, which a roof provides free.

The reason a 500kW canopy is better value per kWp than a small one is structural, not a volume discount. The steel frame and foundations make up around 45% of the total cost, and that engineering job — sinking foundations, erecting frames to Eurocode wind and snow loading — is largely fixed. Spread it across 500 kWp instead of 50 kWp and the per-kWp figure falls toward the £900 end. See our full cost breakdown for how the ranges apply to other sizes.

Per-bay breakdown and structure choices

For a 250-bay car park, two structural decisions move the price:

• Steel vs timber. Galvanised steel is the default: it spans wide, carries the loads, and gives the lowest £/kWp at scale. Timber or glulam is a premium, architectural choice for heritage or high-visibility settings, and costs more.
• Cantilever vs multi-bay. A single-post cantilever gives column-free bays that are easiest to park under, but costs more per kWp. Multi-bay, back-to-back continuous canopies put columns between rows and are the cheapest per kWp at scale — usually the right call for a 250-bay commercial site. A double-sided, back-to-back layout can also lift generation to as much as ~4 kWp per bay.

Foundations are the part sites underestimate. Around 90% of sites use ground screws; ballasted bases suit ground you cannot dig, and driven piles suit others. If a quote looks unusually cheap, ask what standard the frame is engineered to — a bargain that skimps on the 45% is a false economy.

What a 500kW carport generates

At the UK average yield of 900-950 kWh per kWp, a 500 kWp canopy produces roughly 450,000-475,000 kWh a year (more on the south coast, less in northern Scotland). Bifacial panels — capturing light reflected off the ground and cars — add roughly 5-12% on top.

The money comes from self-consumption. Grid electricity for a business runs 25-47p/kWh depending on size and contract, while self-generated solar costs about 10p/kWh over its life — and self-consumed solar is worth roughly twice what you earn exporting it. A large car park with strong daytime demand can self-consume most of what it makes, with the surplus sold under the Smart Export Guarantee (~1-15p/kWh).

For a real-world anchor: DESNZ modelling from May 2025 found an 80-space car park could save around £28,000 a year through self-consumption. Scaled up, a well-utilised 500kW scheme with high self-consumption can save well into six figures a year, though your exact figure depends on how much of that 450,000+ kWh you use on site versus export.

Worked payback example

Take a mid-case 250-bay scheme at £550,000 installed. If self-consumption and export together deliver a net annual saving in the region of £55,000-£70,000, the raw payback lands at roughly 8-11 years — squarely in the honest range.

• Solar-only payback: 8-12 years. You are paying for the structure as well as the panels, so break-even is longer than a roof’s 4-6 years.
• With EV charging: 7-11 years. Adding 7-22kW AC charge points converts cheap ~10p/kWh solar into a service, capturing the full spread against 25-47p grid power.

We will not quote a five-year solar-only payback on a canopy, because it is not realistic — anyone who does is ignoring the structure cost. The upside: a canopy engineered to Eurocode standards is a 25-year-plus asset, so the years after payback are close to free electricity, plus you gain shade, weather protection and EV-ready infrastructure. A live public-sector example is the Princess Royal Hospital in Telford — a 200 kW solar car-park canopy backed by £445,000 of Great British Energy funding, projected to save about £35,000 a year, working from early 2026.

Funding and tax relief

For a business buying outright, capital allowances are the biggest lever. You can use the £1m Annual Investment Allowance (100% relief — the practical route for almost every single-site canopy) plus the 50% First-Year Allowance on any balance above the cap. One correction that matters at this spend: solar is a special-rate asset and is excluded from 100% full expensing. If anyone tells you a 500kW carport qualifies for full expensing, they are wrong.

Other live support:

• Business rates: on-site renewable generation is exempt in England to 31 March 2035.
• Workplace Charging Scheme: to 31 March 2027 — up to £500 per socket (£2,000 for state-funded education), 75% of cost, up to 40 sockets.
• Great British Energy capital for the NHS and schools; Salix 0% loans for schools.
• VAT: 0% on domestic solar to 31 March 2027 (a standalone canopy in a domestic curtilage is not confirmed by HMRC).

Do not let anyone present closed schemes as live: the Public Sector Decarbonisation Scheme (PSDS) closed in November 2024, and the staff-and-fleets EV infrastructure grant closed on 31 March 2026. The much-discussed car-park solar mandate is only a call for evidence, not law.

If capital is the barrier, a Power Purchase Agreement (PPA) lets a funder design, pay for, install and own the canopy while you buy the power at a fixed rate below grid over 10-25 years — zero upfront, off balance sheet. You forgo the allowances and export income, but get cheaper electricity and an EV-ready car park from day one. See our grants and funding guide for the current picture.

Planning and grid

In England, the Class OA permitted development right (in force since 21 December 2023) covers solar canopies over non-domestic, off-street parking. That means a prior-approval application on siting, design and glare — not full planning. The limits: no part over 4m high, more than 10m from any dwelling, excluding listed buildings and scheduled monuments, with a SuDS run-off condition, and you must start within three years. This is England only — Wales, Scotland and Northern Ireland still require standard planning.

On the grid, a 500 kWp scheme is well beyond the G98 threshold (3.68kW per phase), so it needs G99 pre-approval from your DNO — typically 4-8 weeks, sometimes longer where capacity is constrained. MCS certification is required to claim the Smart Export Guarantee.

Get a costed proposal

The only way to know your number is to model it against your actual half-hourly consumption. We are a turnkey, MCS-certified installer — structure, PV, electrical and DNO connection under one contract, not a bare frame — accredited with MCS, NICEIC, RECC and TrustMark and backed by an IWA workmanship warranty. To size a 500kW canopy to your site, see our solar carports and car parks page, request a free quote, or call +44 7707 970661.