Plenty of Irish homes have the budget for solar but not the roof. North-facing, split into small pitches, shaded by a line of ash trees, or covered in a slate no installer wants to drill. If that’s you, look at the ground instead.
Ground-mounted solar panels suit your property if you have a clear, unshaded patch of ground to the side or rear of the house and a roof that can’t do the job. Up to 25 square metres of panels can usually go in without planning permission, the SEAI grant still applies, and you’ll get the panels at the exact tilt and direction a roof rarely allows.
Where they don’t suit is a tight suburban garden, a plot that floods, or a site where the panels would end up 60 metres from the house. The cable run and the digging are what push the price up, and that’s the trade-off this guide walks through.
When Does a Ground-Mounted System Beat the Roof?
Most of the time, the roof wins. It’s already there and it costs less to mount on. A ground array earns its place in a handful of situations.
- Your roof faces north, or it’s split east and west into pitches too small for a decent string of panels.
- Trees, a neighbouring extension or a chimney stack shade the best pitch for a chunk of the day.
- The roof is slate, asbestos cement or in poor repair, and you’d be paying for roofing work before a single panel goes up.
- You want more panels than the roof can hold, common on farms and any home running a heat pump and an EV.
If you’re unsure, read up on how to tell whether your roof suits solar PV before you write it off, because a roof that looks awkward often still outperforms a compromised ground site.
Across SPV Energy’s 3,000-plus installs, ground mounts are the minority. They’re the right tool for the wrong roof rather than a default.
Do Ground-Mounted Solar Panels Need Planning Permission in Ireland?
Usually not for a house, within limits. The 2022 exemptions that freed up rooftop solar also cover free-standing arrays, but the ground rules are tighter.
Houses
For a dwelling, a free-standing array is exempt from planning if the total panel area, counting any ground panels already on the site, is no more than 25 square metres. It has to stand less than 2 metres above ground level, and it can’t eat into the private open space to the rear or side of the house so much that under 25 square metres is left. Go over any of those and it’s a planning application.
One more catch. Inside a Solar Safeguarding Zone, the mapped areas around airports and hospital helipads, the thresholds differ and you need to check your county’s maps. The full detail is in SPV’s guide to planning permission for solar panels in Ireland, which covers the rooftop and ground rules side by side.
Farms and Businesses
Farm, industrial and commercial premises have their own exemption classes with separate area caps, and they’re smaller than people expect. A dairy farm wanting 30kW on the ground will almost always be making a planning application, so build that time in.
How Much Ground Do You Actually Need?
Less than most people imagine. A modern residential panel is around 2 square metres, so the 25 square metre cap works out at roughly 12 panels, or about 5kWp with today’s 430W-class modules. That’s a full-size domestic system in a footprint of about 7 metres by 4 metres.
Tilted panels throw a shadow behind them, so two rows need a gap between them or the back row loses output on winter mornings and evenings. Ireland’s low winter sun makes that gap wider than it would be in Spain.
A hedge to the south that’s 3 metres tall today will be 5 metres in a few years, and you can’t tilt your way out of that. The same thinking SPV applies to trees and shading on solar panels applies at ground level, only more so, because you’re lower down and closer to whatever’s casting the shadow.
What Does a Ground-Mounted Install Involve?
A rooftop job for a typical house is done in a day. A ground mount usually takes two, because there’s civil work before the electrical work.
The frame comes first, either driven ground screws or concrete footings for soft or uneven ground. Heavy drumlin clay around Cavan, Monaghan and Meath holds water, which often decides which one. The panels bolt on at a fixed tilt, typically 30 to 35 degrees facing south. That’s close to ideal for Irish latitudes and the main reason ground arrays often out-produce a similar-sized roof system over a year.
Next is the cable run. Armoured cable goes back to the house in a trench, and the longer the run, the heavier the cable needed to avoid losing power on the way. Eighty metres across a yard with a concrete apron to cut through is where quotes start climbing. Digging the trench yourself is a fair way to trim the cost.
The inverter sits in the house or an outbuilding as normal, the installer applies to ESB Networks for the grid connection as they would for a roof system, and the handover and aftercare are no different.
Can You Still Get the SEAI Grant and Export Credits?
Yes to both. SEAI’s residential solar PV grant is tied to the home and the installer rather than to where the panels sit. The property has to have been built and occupied before 2025, the installer has to be SEAI-registered, and a post-works BER assessment is required. The grant pays €700 per kWp for the first 2kWp and €200 for each kWp after that up to 4kWp, capped at €1,800, as published on SEAI’s solar electricity grant page at the time of writing. Confirm the figures when you apply, as they do get revised.
Export credits work the same way. Once the system is registered with ESB Networks, your supplier pays you for surplus units sent to the grid under the microgeneration scheme. For a business or a farm the grant route is different, and SPV’s overview of solar grants in Ireland sets out which scheme applies to which type of site. SPV handles the paperwork either way.
What Are the Downsides Nobody Mentions?
Cost is the obvious one. Between the frame, the footings and the trenching, a ground-mounted system costs more than the same panels on a roof, and how much more depends on your site. Treat any figure you see online as a guess until someone has walked the ground.
Space is the second. A 7 by 4 metre frame alters how a garden gets used, it needs a fence if there’s livestock or dogs about, and the grass underneath still has to be cut.
Then there’s the quiet upside. Cleaning is a hose and a soft brush at ground level rather than a call-out, and any fault gets diagnosed standing on grass rather than a ladder. For an older homeowner, that alone can swing the decision.
If your roof can’t carry a decent system and you’ve a clear, south-facing patch to the side or rear, ground-mounted panels are a sound option rather than a compromise. The only way to know for sure is a site visit. SPV Energy’s team will walk the ground, check the shading and the cable route, and tell you plainly whether a ground mount, a roof mount or neither is the right call. Request a free quote through the contact page or ring 049 489 1207, and you’ll have an answer within 24 hours.
FAQs
Do ground-mounted solar panels need planning permission in Ireland?
Not for most houses, provided the total panel area is 25 square metres or less, the array stands under 2 metres high and at least 25 square metres of private open space is left at the side or rear. Larger arrays, Solar Safeguarding Zones and most farm or business installs need an application.
Can I get the SEAI grant for a ground-mounted system?
Yes, the grant conditions are about the home and the installer rather than where the panels sit. Your house must have been built and occupied before 2025, your installer must be SEAI-registered and you’ll need a post-works BER assessment. Check seai.ie for the current amounts before you apply.
How much space do I need for a ground-mounted solar array?
Around 12 panels, or roughly 5kWp, fits in a footprint of about 7 metres by 4 metres. Allow extra room behind the panels for the shadow they cast and keep well clear of hedges or trees to the south.
Are ground-mounted panels more expensive than rooftop panels?
Yes, because of the frame, the foundations and the cable trench back to the house. How much more depends on your soil, the distance to the house and whether there’s concrete to cut through, so a site visit is the only reliable way to price it.
Do ground-mounted panels produce more electricity than roof panels?
Often, yes. They can be set at the ideal tilt and pointed due south, which a roof rarely allows. The gain over a year depends on how poor the roof alternative was.
How long does a ground-mounted solar installation take?
Usually two days for a typical domestic system, sometimes three if the digging and trenching are done on a separate visit. The ESB Networks connection and grant paperwork run the same as for a roof install.