Ground-mounted solar panels are a viable alternative to roof-mounted systems for homeowners with garden or land space and a roof that is not suitable — or not optimal — for solar installation. They are more common on rural properties, farms, and larger suburban plots than in urban settings, but the technology and economics are well-understood and the performance can match or exceed a typical roof installation when sited and oriented correctly. The main constraints are planning and cost: ground-mounted systems are more expensive per kWp than roof-mounted and often require planning permission even where a roof system would not.
When Ground-Mount Makes More Sense Than Roof-Mount
Ground-mounted solar is worth considering when the available roof area is insufficient for the system size required; when the roof orientation is predominantly north-facing with no south-facing alternatives; when the roof covering is asbestos cement or another material incompatible with standard mounting systems; when the roof is in poor condition requiring near-term replacement (removing and reinstalling panels adds cost); or when the property has a large south-facing garden or paddock with no shade and permission to install. Ground-mounted panels can be optimised in orientation and pitch precisely — they are not constrained by the roof's existing angle and direction — which can produce higher specific yield per panel than a sub-optimal roof installation.
"A ground-mounted system on an unshaded south-facing plot optimised at 35 degrees pitch will typically generate 5–8% more per kWp than a typical domestic roof installation, which is often at a slightly sub-optimal pitch or orientation. This is not the primary reason to choose ground-mount — the planning flexibility and the independence from roof condition are more compelling arguments for most rural properties — but the generation advantage is real and relevant in a payback calculation."— Planning Portal — Ground-Mounted Solar Panels
Planning Permission for Ground-Mounted Solar
Ground-mounted solar panels within a domestic curtilage (garden) are permitted development in England under Class A of Schedule 2, Part 14 of the GPDO, provided: the system is not on article 2(3) land (Conservation Areas, National Parks, AONBs, World Heritage Sites); the panels do not exceed 9m² in aggregate ground coverage; the height does not exceed 4m; and the installation is not within 5m of the property boundary. Most domestic garden installations stay within these limits. Larger systems or systems on restricted land types require full planning permission.
Foundation Options and Installation
Ground-mounted solar systems use one of three foundation types: ground screws (helical screw piles driven into the soil — fast, reversible, and suitable for most soil types); concrete pad foundations (more permanent, required for heavier structures or poor-bearing ground); or ballasted frames (weighted frames requiring no ground penetration — suitable for hard standing or situations where ground penetration is not permitted). Ground screws are the most common choice for domestic installations — they are installed in a few hours without excavation and can be removed without trace, which is relevant for planning reversibility arguments.
"Ground screw foundations have transformed the economics of small ground-mounted systems. A decade ago, ground-mount necessarily meant concrete foundations and significant groundworks cost. A modern helical ground screw installation can be driven in an afternoon, requires no concrete mixing or excavation, and can be removed completely in a few hours if planning conditions require reversibility. For domestic scales up to around 10kWp, ground screws are almost always the right choice."— MCS — Ground-Mounted Solar PV Standards
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