What Drives the Cost of a Solar Carport in the UK
What does a UK solar carport actually cost in 2026? Here's the full answer, with line-item budgets for projects from 75 kWp to 2 MWp, plus AIA and grant treatment.
Headline range: £950-£1,300/kWp
Modern UK commercial solar carports typically cost between £950 and £1,300 per kWp installed (a general UK market range), when the price includes design, planning, structural steel, foundations, panels, inverters, AC commissioning and MCS certification. The range reflects: panel and inverter brand selection (Tier-1 premium adds £40-£80/kWp); steel-frame complexity (heritage finishes, multi-bay clearance, structural complexity); ground conditions (rock vs clay); and DNO connection complexity.
Indicative breakdown of a 300 kWp project's £290k capex
An indicative split only; quotes for the specific site will differ. Panels (~518 × 580W bifacial): £60k-£70k (21% of total). Inverters (3 × 100 kW string): £18k-£24k (7%). Carport structure (steel + foundations): £105k-£125k (40%). Electrical (DC, AC, switchgear): £30k-£40k (12%). Design, planning, project management: £25k-£35k (10%). Site prep, mobilisation, commissioning: £20k-£30k (8%). Contingency: £8k-£12k (3%).
AIA changes the maths
Annual Investment Allowance lets UK businesses write 100% of solar plant against year-one corporation tax. On £290k capex at 25% corporation tax, AIA saves £72,500 in year-one tax. Effective post-tax capex: £217,500. AIA is permanent at £1m per company group.
VAT considerations
Commercial solar carports attract standard 20% VAT, recoverable for VAT-registered buyers. Domestic carports (rare in commercial scope) are zero-rated under VAT Notice 708/6 until 31 March 2027.
Where to spend more (and where not to)
Spend more on: Tier-1 bifacial panels (+£40-£60/kWp, 18-24 month payback); module-level power optimisers on partially-shaded sites (typically +£50-£70/kWp, limiting the string-level losses that shading causes); 25-year inverter warranty extensions (+£10-£15/kWp). Don't overspend on: aesthetic finishes beyond planning requirements; oversized inverters (DC:AC ratio of 0.85-0.95 is optimal); battery storage unless you have TOU tariffs with peak/off-peak differential >10p/kWh.
EV charger budget on top
Add £1,200-£3,200 per 7-22 kW socket; £4,500-£12,000 per 50 kW DC rapid. OZEV WCS grant covers £500/socket × 40 sockets = £20k recovery.
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