Not every property has a suitable roof for solar panels. Ground-mounted garden solar systems offer an alternative that can actually outperform rooftop installations — you choose the exact angle, orientation, and position for maximum generation. Garden solar costs £1,500-£2,000 per kWp installed (15-20% more than rooftop due to mounting frames and groundwork), but the ability to optimise positioning can offset the extra cost through higher output.
| System Type | Size | Cost | Annual Output |
|---|---|---|---|
| Plug-in balcony/patio panels | 400-800W | £300-£600 | 350-700 kWh |
| Garden room / shed solar | 1-3 kWp | £2,000-£5,000 | 900-2,700 kWh |
| Ground-mounted array | 3-6 kWp | £5,500-£12,000 | 2,700-5,400 kWh |
| Solar pergola / carport | 2-4 kWp | £6,000-£15,000 | 1,800-3,600 kWh |
Ground-mounted systems over 9m² and higher than 4m may need planning permission. Systems within permitted development limits (no higher than 4m, no closer than 5m to the boundary, not in a conservation area front garden) do not require planning approval. Always check with your local planning authority before installing.
North-facing roof — If your roof faces north, ground-mounted panels in a south-facing garden position will generate 40-50% more than rooftop panels.
Shaded roof — Trees, chimneys, or neighbouring buildings shading your roof? Garden panels can be positioned in unshaded spots.
Listed building — If planning won't permit rooftop panels, garden systems are often acceptable as they don't alter the building's appearance.
Garden office / home office — With more people working from home, powering a garden office with its own solar system makes the workspace energy-independent.
Ground-mounted panels under 9m² and below 4m height are usually permitted development. Larger arrays or those in conservation areas may require planning permission. Check with your local authority.
Ground-mounted systems cost £1,500-£2,000 per kWp — about 15-20% more than rooftop due to mounting frames and groundwork. A typical 4 kWp system costs £6,000-£8,000.
Plug-in panels (400-800W) cost £300-£600 and save £80-£150 per year. They pay for themselves in 3-5 years. They don't require an electrician or MCS certification but won't qualify for SEG payments.
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