System Types
Mono-Pitch (Single-Slope) Solar Canopy
Mono-pitch single-slope canopies are the most widely installed commercial solar canopy design in the UK. A mono pitch canopy mounts every panel on one south-facing slope at the optimum UK angle, giving the lowest cost per kWp and the simplest structural and planning route. Below: full spec, cost-by-size, worked payback, UK tax relief and EV-ready options.
Get a structural assessmentWhat Is a Mono-Pitch Solar Canopy?
A mono-pitch canopy has a single sloping surface — like a lean-to roof. Panels are fixed to the slope at a consistent angle (typically 8-12 degrees in the UK for optimal yield). The slope faces south or south-west for maximum solar generation.
The structure sits on galvanised steel columns, typically one column per 2-4 car bays depending on the span and load requirements. The result is a clean, simple structure that provides covered parking while mounting solar panels at the optimal angle.
Structural Specification
Our standard mono-pitch canopy design:
| Element | Specification |
|---|---|
| Columns | 150x150 CHS or 200x200 SHS hot-dip galvanised to BS EN ISO 1461 |
| Rafters | IPE or RHS sections, structural grade S355 |
| Cladding rails | Aluminium or galvanised steel Z/C purlins at 900mm centres |
| Foundation | In-situ concrete pile or ground screw (site-specific) |
| Design life | 40 years (galvanising + paint finish) |
| Wind loading | Eurocode 1 (EN 1991-1-4), for site-specific wind zone |
| Snow loading | Eurocode 1 (EN 1991-1-3), for site latitude |
| Panel attachment | Aluminium mid/end clamp system, stainless fasteners |
Dimensions
Standard module dimensions for car park applications:
- Bay depth: 5.0m (standard car) to 6.0m (large vehicle)
- Bay width: 2.5m (standard) to 3.0m (accessible)
- Eaves height: 2.4m minimum (standard), 3.8m+ for HGV access
- Ridge height: 4.0-5.5m depending on span and pitch
- Column spacing: 5.0-6.0m along bay length
Yield vs Other Canopy Types
At optimal orientation (south-facing, 10-degree pitch):
| Canopy type | Relative yield vs mono-pitch |
|---|---|
| Mono-pitch (south) | 100% (baseline) |
| T-frame (dual pitch, E-W) | 92-95% |
| Cantilever | 98-102% (bifacial benefit) |
| Flat canopy (0 deg) | 88-93% |
The mono-pitch trades some flexibility (column spacing, access) for straightforward structural design and slightly superior south-facing yield versus T-frame.
Mono-Pitch Solar Canopy Cost
Mono-pitch single-slope canopies are the most cost-effective canopy type because the structure carries the least steel per kWp. Indicative UK installed cost is £900–£1,200 per kWp (roughly £9,000–£12,000 per fully covered parking bay, including ground works, DNO application and commissioning):
| System size | Approx. bays covered | Indicative installed cost | Annual generation |
|---|---|---|---|
| 30 kWp | 8–10 bays | £30,000–£40,000 | ~28,500 kWh |
| 50 kWp | 14–16 bays | £48,000–£62,000 | ~47,500 kWh |
| 100 kWp | 28–32 bays | £95,000–£125,000 | ~95,000 kWh |
| 250 kWp | 70–80 bays | £230,000–£300,000 | ~237,500 kWh |
| 500 kWp | 140–160 bays | £450,000–£580,000 | ~475,000 kWh |
Generation figures assume ~950 kWh per kWp/yr at south-facing UK irradiance and a 10° pitch. See the full commercial solar canopy cost guide. Cost varies with ground conditions, column spacing and access.
Worked Payback Example — 100 kWp Mono-Pitch Canopy
| System size | 100 kWp (~30 bays) |
| Installed cost | ~£110,000 |
| Annual generation | ~95,000 kWh |
| Self-consumed (~70%) | ~66,500 kWh @ 28p = £18,620/yr |
| Exported under SEG (~30%) | ~28,500 kWh @ 5p = £1,425/yr |
| Combined year-1 benefit | ~£20,045/yr |
| Simple payback | ~5.5 years |
| 25-year net benefit | £390,000+ |
The saving is dominated by self-consumption (offsetting daytime grid import at ~28p), not export — daytime car-park generation aligns well with commercial demand. Apply the tax relief below and the effective payback shortens further.
Tax Relief & Finance
A mono-pitch solar canopy is plant & machinery, so it qualifies for generous UK commercial tax relief:
- Annual Investment Allowance (AIA) — companies can deduct the full cost of qualifying new solar plant against profits in year one, cutting the net cost by up to 25% (corporation tax at 25%).
- Annual Investment Allowance (AIA) — 100% relief on up to £1m of qualifying expenditure for unincorporated businesses.
- Smart Export Guarantee (SEG) — paid for surplus generation exported to the grid (on-site self-consumption is the real saving).
- Business rates — eligible on-site renewable generation plant is exempt from business rates in England until 2035.
We model the post-tax position in the free feasibility study. Finance routes include outright purchase, lease and PPA (zero-capex) — see finance options.
EV-Ready Mono-Pitch Canopies
A single-slope canopy is the ideal host structure for car-park EV charging: the same columns that carry the solar slope route power and data down to chargepoints, and solar generation offsets charging load to avoid (or defer) an expensive DNO grid upgrade.
- 7kW–22kW destination chargers for staff, visitor and customer bays under the canopy.
- Load management / smart charging to keep total demand within the existing supply where possible.
- Battery storage pairing to store midday canopy generation for evening fleet or peak-rate charging.
- DNO / G99 connection handled in-house as part of the scheme design.
Pairing solar canopy generation with EV charging is the strongest commercial case for a mono-pitch structure — most generic canopy manufacturers omit it entirely.
When Mono-Pitch Is the Right Choice
Choose mono-pitch when:
- Your car park has a clear south or south-west orientation
- You want the lowest cost-per-kWp installation
- The site does not need HGV or ambulance access under the structure (standard eaves height sufficient)
- You want the simplest planning presentation (single-slope appearance is less visually intrusive)
Consider T-frame or cantilever when:
- Your car park runs east-west with no south-facing option
- You need 4m+ clear access height throughout (cantilever works better)
- You want bifacial panel benefit maximised (cantilever)
- The site has limited column spacing options
Permitting and Planning
Mono-pitch canopies up to 9m ridge height generally satisfy Class J Permitted Development criteria. The single-slope profile creates minimal visual impact from adjacent highway. Most mono-pitch commercial canopy projects proceed under PD without requiring a full planning application.
Get a Mono-Pitch Feasibility Study
We provide a free feasibility study for mono-pitch canopy projects, including structural scheme design (pre-detailed), yield modelling (PVSyst), financial model (25-year DCF), and planning assessment. Response within 5 working days.
Free canopy feasibility study
Get your site-specific canopy figures — within 5 working days
Tell us your car park size and we return a desk-based feasibility study: indicative system size in kWp, a PVSyst-modelled annual generation figure, turnkey capital cost band, first-year Annual Investment Allowance saving, projected payback, and any planning or DNO issues we can see from the outset. No site visit needed to start.