One of the first questions people ask when they’re thinking about solar panels is whether they need planning permission. The answer — for most houses in England — is no, and you can proceed straight to getting quotes from MCS-accredited installers. But there are genuine exceptions, and getting caught out on planning rules after installation is an expensive problem to fix. Here’s what actually applies to your situation.
Permitted Development: The Default Position
Solar panels on houses in England fall under Class A of Schedule 2 to the Town and Country Planning (General Permitted Development) Order 2015, which means they’re treated as permitted development and don’t require a formal planning application. The conditions that apply are straightforward but specific.
On a pitched roof, panels must not protrude more than 200 millimetres from the roof plane when installed. They can’t be higher than the highest part of the roof, excluding the chimney. On a flat roof, the 200mm rule still applies measured from the surface. If you’re adding panels to a wall rather than a roof, they mustn’t protrude more than 200mm from the wall face, and there are height restrictions depending on the wall facing.
These dimensions cover the overwhelming majority of standard domestic installations. A typical 350-watt panel is around 100mm deep when mounted on standard L-foot fixings, well within the 200mm limit. Your installer will be familiar with these constraints and should flag any issues during the survey.
Listed Buildings: A Different Situation Entirely
If your home is listed, the permitted development exemptions don’t apply. You’ll need both listed building consent and, in most cases, full planning permission before installing solar panels. This isn’t a technicality — it’s consistently enforced and the penalties for unauthorised works to a listed building are significant.
The good news is that listed building consent applications for solar panels are sometimes approved, particularly for rear-facing installations that aren’t visible from the street. The key is working with a planning consultant who has experience with historic environment cases and engaging with your local planning authority early. The Historic England guidance on renewable energy at historic buildings is worth reading before you start.
To be honest, if you’re in a listed building, the planning process adds cost and time, and there’s genuine uncertainty about the outcome. It’s worth getting a pre-application consultation with the planning authority before commissioning a survey.
Conservation Areas: Mostly Fine, With One Key Exception
Being in a conservation area doesn’t automatically remove your permitted development rights for solar panels, which surprises a lot of people. The main restriction is that panels can’t be installed on a wall or roof slope that is visible from a highway if that part of the building faces the road.
In practice, this means south-facing roof panels on a house where the south face is also the front (street-facing) elevation could be restricted in a conservation area. North-facing front elevations with south-facing rear slopes — very common in UK terraced streets — are typically fine.
If you’re in a conservation area, talk to your local planning authority’s duty planner before booking an installer. They can give you informal guidance on whether your specific installation would fall within permitted development, and it costs nothing to ask.
Ground-Mounted Solar: Stricter Rules
Panels on the ground rather than the roof have their own permitted development classification and the conditions are tighter. A ground-mounted system can have a maximum panel area of 9 square metres (roughly 18-20 standard panels, so around 6-7kW), must be no more than 4 metres high, must be more than 5 metres from any property boundary, and there can only be one such system per property.
Beyond those limits, you need planning permission. Given that most home battery-solar setups these days are pushing into larger capacities, plenty of ground-mounted systems do require an application. A well-presented application for residential ground-mounted solar is often approved, but it adds weeks to the timeline.
Also worth knowing: ground-mounted systems still need to meet the 200mm protrusion rule in some interpretations, though this is more relevant for wall-mounted situations.
Scotland, Wales, and Northern Ireland
Planning rules are devolved, so the GPDO doesn’t apply outside England. Scotland has similar but not identical permitted development rules through the Town and Country Planning (General Permitted Development) (Scotland) Amendment Order 2012. Wales has its own class schedule under the Town and Country Planning (General Permitted Development) Order 1995 (as amended for Wales). Northern Ireland operates under a separate planning framework.
If you’re not in England, the broad principles are similar — domestic rooftop solar is generally permitted development with conditions — but the specific measurements and exceptions differ. Check with your local planning authority or a planning consultant familiar with your jurisdiction.
Flats and Apartments
Permitted development rights for solar panels generally don’t apply to flats or apartments. If you own a flat and want solar panels, you’ll typically need planning permission plus agreement from the freeholder and potentially other leaseholders, depending on your lease terms. Purpose-built flats in blocks are particularly constrained. This is one area where shared ownership of a building-wide installation, potentially arranged through the building management, makes more sense than an individual flat owner pursuing their own system.
Practical Steps Before You Book an Installer
Before signing anything, check your local planning authority’s online mapping tool to confirm whether your property is listed or in a conservation area. Most council websites have this. If there’s any doubt, call the planning department’s duty line — they’re generally helpful with quick queries of this kind.
Your MCS-accredited installer should be familiar with these rules and should flag any potential issues during the site survey. If an installer isn’t asking about your property’s planning status, that’s worth noting. The MCS accreditation process includes training on planning requirements, so it’s part of what you’re paying for when you use an accredited company.
If you do need planning permission, your installer may handle the application or refer you to a planning consultant. Either way, don’t start installation until any required permissions are in place — the enforcement headache if something goes wrong is not worth the time saved.