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Solar Carport Calculator (UK)

Free UK solar carport calculator. Price the steel canopy + PV + EV charger, then see annual SEG income and 25-year savings in seconds.

Solar Carport Calculator

System size
8 kWp
Total panels
20
Annual energy yield
7,600 kWh
Self-consumption
66.8%
Carport structure cost
£4,400
PV system cost
£12,800
EV charger cost
£900
Total project cost
£18,100
Annual savings
£1,623
Payback period
11.2 years
25-year net benefit
£22,465

How to use this calculator

Enter parking bays, panels per bay, panel wattage, and local UK market prices. The tool returns installed cost, annual yield, MCS-compatible savings, and 25-year net benefit. Defaults reflect 2026 UK pricing pulled from Solar Energy UK installer surveys, MCS Installer Directory, Checkatrade, and Energy Saving Trust.

Inputs that matter most:

  1. Parking bays — a typical 2-car residential carport is 6 m × 6 m and accommodates 18 to 20 panels. A single-bay carport (3 m × 6 m) holds 8 to 10 panels.
  2. Panels per bay — at 400 W per panel, 10 panels per bay gives 4 kWp per bay. UK Permitted Development de facto caps most residential carports at 4 kWp per bay before the homeowner needs full planning consent.
  3. Panel wattage — 400 W is mainstream 2026 (JA Solar JAM54S30, Trina Vertex S, REC Alpha Pure-R). High-efficiency panels (Aiko ABC, Maxeon 3 DC) reach 440 to 460 W at a 25 to 40% premium.
  4. Carport per bay — £1,800 to £3,500 covers prefab steel kits from Solar Carports UK, ESE Carports, or SunPort. Bespoke timber-and-steel hybrids run £3,500 to £5,500 per bay.
  5. PV cost per kWp — £1,400 to £1,900 per kWp installed at 0% VAT for the residential domestic scheme. The figure includes panels, inverter, DC and AC wiring, in-roof or on-roof racking, MCS certification, and DNO G98 notification.
  6. EV charger — £900 covers a hardwired 7 kW Mode 3 unit installed to BS 7671 18th Edition Amendment 2 and Section 722.

How the math works

panels_total       = bays × panels_per_bay
system_kWp         = panels_total × panel_W / 1000
carport_cost       = bays × carport_per_bay
pv_cost            = system_kWp × pv_cost_per_kWp
ev_cost            = ev_count × ev_charger_cost
total_cost         = carport_cost + pv_cost + ev_cost
annual_yield_kWh   = system_kWp × kWh_per_kWp_yr
self_consumption%  = base + ev_share × 100   (capped at 95%)
annual_savings     = self_consumed_kWh × import_rate + exported_kWh × SEG_rate
payback_yrs        = total_cost / annual_savings
25_yr_net          = annual_savings × 25 - total_cost

Worked example for a Manchester homeowner with one EV: 2 bays × 10 panels × 400 W = 8 kWp system. Steel canopy £2,200/bay = £4,400. PV at £1,600/kWp = £12,800. One Zappi 2 untethered = £900. Total: £18,100. Annual yield at 950 kWh/kWp = 7,600 kWh. With one EV at 2,800 kWh/yr, self-consumption rises from 30% to ~67%, so 5,090 kWh offsets retail at £0.245 = £1,247 saved; the 2,510 kWh export earns SEG at £0.15 = £377. Annual savings: £1,624. Payback: 11.1 years. 25-year net benefit: +£22,500.

UK solar carport cost benchmarks (2026)

Solar Energy UK Installer Survey 2024 + Checkatrade carport job database:

ItemLowMedianHigh
Steel structure (prefab)£1,800/bay£2,200/bay£3,500/bay
Concrete piers (4 per bay)£900£1,400£2,400
PV equipment + racking£900/kWp£1,100/kWp£1,300/kWp
PV install labour£300/kWp£400/kWp£600/kWp
Inverter (string with optimisers)£900£1,300£2,200
MCS + DNO + Building Control£300£600£1,200
EV charger (7 kW Mode 3)£600£900£1,400
Turnkey 8 kWp, 2-bay total£14,000£18,100£24,500

Source: Solar Energy UK Cost of Solar Report 2024, MCS Installer Database, Checkatrade tradesperson quote data.

Why carport economics differ from rooftop in the UK

UK roofs cost £1,300 to £1,600 per kWp because labour is the main cost. A carport adds £500 to £900 per kWp for the structural envelope, but recovers some of that through better azimuth and tilt (carports designed for solar use a 30 to 35 degree south-facing pitch versus typical UK roof pitches that vary widely). With the 0% VAT scheme on domestic PV running through 31 March 2027 covering the entire installation including the structural mounting, carports timed within that window get an effective 20% discount versus post-2027 pricing.

Regulatory framework

  • Wiring: BS 7671:2018+A2:2022 18th Edition Section 722 (PV systems), Section 712 (electric vehicle supply equipment)
  • MCS certification: MIS 3002 (PV installations under 50 kWp), MIS 3007 (battery storage)
  • DNO notification: G98 for single-phase installs under 3.68 kW, G99 for everything above (most carport-scale systems)
  • Export tariff: SEG under Ofgem rules — must hold MCS certificate and a SMETS2 smart meter
  • Building Control: Building Act 1984 Part A (structure) and Part P (notifiable electrical work)
  • Planning: Permitted Development Class E (GPDO 2015) for accessory buildings under 4 m ridge

When a carport beats roof solar in the UK

  • Roof faces east or west and roof pitch is steep (over 45 degrees)
  • Roof has more than 15% chimney or dormer shading
  • Property is a flat conservation-area roof where rooftop panels are restricted
  • Driveway or rear parking has clear south-facing exposure with no overhanging trees
  • Household has one or more EVs to charge during daytime
  • HMO landlord or letting agent wants tenant-visible green credentials without altering the let property

Regional yield reference (kWh/kWp/yr)

PVGIS 5.2 + Solar Energy UK Performance Report 2024:

RegionAnnual yield
Cornwall, Devon, S. Wales1,000-1,050
London, Sussex, Hampshire950-1,000
Midlands, Yorkshire900-950
Lancashire, Cumbria850-900
NE England, S. Scotland820-880
N. Scotland750-820
N. Ireland850-900

Pair this carport analysis with our cost of solar panels calculator for a rooftop alternative, our solar panel payback calculator, our solar panel ROI calculator, and our EV charging cost calculator.

Sources

Frequently asked questions

How much does a solar carport cost in the UK in 2026?
A 2-bay residential solar carport with an 8 kWp PV system runs £15,000 to £22,000 turnkey at 0% VAT (the zero-rated VAT scheme on residential domestic PV runs through 31 March 2027). Steel canopy alone is £1,800 to £3,500 per bay (cantilever designs cost more than post-and-beam). The 8 kWp PV portion runs £1,400 to £1,900 per kWp installed because carport mounting is cheaper than scaffolding a roof but the structural calcs add cost. Add £800 to £1,400 for a tethered or untethered Mode 3 EV charger including the OZEV-approved installation.
Is a solar carport worth it versus rooftop PV in the UK?
Rooftop PV is 25 to 35% cheaper per kWp because you do not pay for the structure. A carport makes sense when the roof is shaded by trees or chimneys, faces east-west, is too old (Class F or worse on the EPC), or where the homeowner wants integrated EV shelter. With UK self-consumption rates near 30% and SEG export at 10 to 15p/kWh, a well-sited carport typically pays back in 12 to 15 years on the Octopus Outgoing Fixed or E.ON Next Export Exclusive tariffs.
Do solar carports need MCS certification in the UK?
Yes for any installation under 50 kWp that wants SEG payments. MCS MIS 3002 (PV) covers the panels, inverter, and balance-of-system; the installer must hold MCS Contractor certification. The structural steel needs Building Control sign-off under the Building Act 1984; in England this is typically Part A (structure) and Part P (electrical). Planning permission is needed if the carport is forward of the front elevation of the house or in a conservation area; Permitted Development under Class E of the GPDO covers most rear-garden carports under 4 m ridge height.
What SEG export rates apply to solar carport exports in 2026?
The Smart Export Guarantee mandates that licensed suppliers offer at least one export tariff to MCS-certified systems under 5 MW. Best 2026 rates (April refresh): Octopus Outgoing Agile (variable, half-hourly), Octopus Outgoing Fixed at 15.0p/kWh, E.ON Next Export Exclusive at 16.5p (for E.ON Next Drive customers), British Gas Export at 6.4p, EDF Export Variable Value at 5.6p. The 16.5p E.ON rate requires a smart meter (SMETS2) and is restricted to customers also on an import tariff with that supplier.
Can a UK solar carport include EV charging?
Yes, and the synergy is strong. UK households drive 12,000 to 14,000 km/yr on average, consuming roughly 2,400 to 2,800 kWh in an EV. Pairing the carport with a solar-aware charger like Zappi 2, Wallbox Pulsar Plus, or Andersen A2 lets you set charge schedules to midday solar export windows. The OZEV EV chargepoint grant ended for homeowners in 2022 but the £350 OZEV grant remains for renters and flat-dwellers. WIRA-S Mode 3 7 kW chargers cost £700 to £1,200 installed.

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