Do you need planning permission for solar panels? Usually not

The short answer

Usually not. Solar panels on a house in England are permitted development, meaning no planning application is needed, as long as the installation stays within a specific set of limits. Those limits were updated by statutory instrument on 27 August 2026, which kept the roof rules largely as they were and added new, more detailed conditions for wall-mounted and ground-mounted solar. Below is what actually applies now, not the version that was true before that date.

Roof-mounted panels: the limits

From UK Statutory Instrument 2026 No. 896, checked directly against the legislation on 3 September 2026. These roof figures did not change in the 2026 amendment; they carry forward from the 2015 order.

Wall-mounted panels: a new, separate route

The 2026 amendment added specific permitted development conditions for solar panels or solar thermal equipment fixed flat to a wall rather than a roof. The protrusion limit depends on the wall's position: no more than 0.2 metres if the wall abuts a highway, and no more than 0.4 metres otherwise, measured perpendicular to the wall surface. This is a genuinely new provision rather than a restatement of the roof rules, so a wall-mounted system, sometimes chosen for a flat or a building with limited roof space, should be checked against these figures specifically rather than assumed to follow the roof limits.

Ground-mounted, stand-alone solar: height and area

A free-standing array in a garden, on a frame rather than fixed to the building, is covered separately as stand-alone solar equipment. Two things are capped: how tall it can be, which depends on where in the garden it sits, and how much total panel area it can cover.

From UK Statutory Instrument 2026 No. 896. The total surface area of the panels forming a stand-alone array must not exceed 9 square metres, regardless of height band.

Blocks of flats: tighter than houses

The 2026 amendment treats blocks of flats separately from houses, and more restrictively. Solar installation on a block of flats, or on a building within its curtilage, is not permitted development in the general case, with only limited exceptions written into the order. Anyone considering solar for a block of flats should treat planning permission as the default requirement and check the specific exceptions with a professional, rather than assume the house rules apply.

Plug-in solar: a fire-safety condition, not a ban

The same 2026 amendment addresses plug-in solar devices, the small socket-connected kits legalised for use in Great Britain from the same date, 27 August 2026, under separate safety regulations. The planning condition is specific and about fire risk rather than the device itself: a plug-in solar unit must not be installed on a wooden wall, balcony or enclosure, or on any wooden part of a building's exterior, and a ground-mounted plug-in unit must not be fixed to a wooden fence, gate, wall or other means of enclosure. Everything else about how these devices work, including the separate electrical safety rules, is covered in our plug-in solar guide.

The transitional rule, if your project was already under way

Where a solar project was designed or agreed against the rules as they stood before 27 August 2026, the 2026 amendment includes a transitional provision allowing it to proceed under the pre-amendment permitted development limits until 26 August 2027. This mainly matters for larger or more unusual installations that were designed around the previous rule set; a standard pitched-roof domestic array is unaffected either way, since the roof-mounted figures did not change between the two versions.

How to actually check your own installation

1. Confirm which category your installation falls into: roof-mounted on a pitched or flat roof, wall-mounted, or stand-alone in the garden. Each has its own limit.
2. Measure or ask your design team to confirm the protrusion or height figure against the relevant table above.
3. If it is a stand-alone array, add up the total panel area and check it against the 9 square metre cap, not just the height.
4. Check whether the property is listed, in a conservation area, or within the curtilage of a scheduled monument, since any of those changes the position regardless of the physical limits.
5. If the property is a flat, treat planning permission as the default requirement rather than the exception, and confirm the position before ordering anything.

When you do need permission

• Listed buildings. Permitted development does not apply. You need planning permission and listed building consent, assessed on the specific proposal.
• Scheduled monuments. Solar on or within the curtilage of a scheduled monument needs permission.
• Conservation areas and World Heritage Sites. The installation must not go on a wall or roof fronting a highway, and must not sit nearer to a highway bounding the property than the building itself.
• Exceeding any of the limits above. Go past the protrusion, height or area figures for your installation type, and the project needs a planning application regardless of building type.
• Most blocks of flats. Treated as needing permission by default under the 2026 amendment, subject to limited named exceptions.

What this actually means for most houses

For the overwhelming majority of pitched-roof houses in England, roof-mounted solar was already inside the permitted development limits before the 2026 amendment, and remains so afterwards: the protrusion and ridge-height figures did not change. What the update mainly does is give wall-mounted and ground-mounted solar their own clear rules for the first time, rather than leaving installers to interpret the roof rules by analogy, and it tightens the position for blocks of flats. If you are having panels fitted on a standard pitched roof and none of the exceptions above applies to your property, planning permission is very unlikely to be part of the conversation at all. Our guide to how many panels fit your roof covers the geometry that actually decides your panel count, which for most homes matters far more than the planning position.

Scotland, Wales and Northern Ireland run their own permitted development systems, which do not automatically mirror the England figures above. If your property is outside England, check the position for your nation specifically rather than relying on this page.

Once the planning position is settled, the two questions that actually decide what you get are how many panels your roof can hold and what they generate for your postcode, which is what the solar calculator models directly rather than leaving to a national average.