Permitted development rules, conservation area restrictions, listed buildings and ground-mount limits for UK businesses — explained plainly, so you know before you commit to a design.
Usually not. Most commercial buildings in England can install roof-mounted solar panels under permitted development rights, meaning no planning application is needed, provided the panels don’t protrude more than 200mm from the roof or wall, don’t exceed the highest part of the roof, and the building isn’t listed. A change in November 2023 removed the previous 1MW generation cap for non-domestic rooftop solar, so even large commercial arrays can often proceed without permission. Ground-mounted systems, conservation areas, listed buildings and very large installations are where the rules get stricter — those are covered in detail below.
Planning permission is one of the first questions business owners ask when they start pricing up commercial solar — understandably, since a lengthy application can add months to a project. The good news is that most commercial rooftop installations in England are covered by permitted development rights and don’t need one at all.
This guide walks through what permitted development actually allows for non-domestic buildings, where the limits sit for roof-mounted and ground-mounted systems, and the situations — listed buildings, conservation areas, very large arrays — where you’ll need to apply. We’ll also cover what happens if you do need permission, so you know what to expect.
Until November 2023, non-domestic rooftop solar under permitted development was capped at 1 megawatt of generation. That cap has been removed, so large commercial and industrial roofs can now carry much bigger arrays without a planning application — provided the other conditions on protrusion, height and listed status are still met.
Permitted development rights are a standing planning consent, set out in the Town and Country Planning (General Permitted Development) (England) Order 2015, that allow certain categories of work to go ahead without an individual application to the Local Planning Authority. Part 14 of that order covers renewable energy equipment, including solar PV and solar thermal panels on non-domestic buildings and land — which for these purposes includes ordinary businesses as well as community buildings.
Provided your installation meets the relevant conditions, you can proceed without submitting a planning application at all. That said, it’s worth checking with your Local Planning Authority whether all the conditions are met for your specific site, since permitted development rights can be removed for individual properties or entire areas — more on that below.
Permitted development rights apply UK-wide with local variations — this guide focuses on the rules for England. Wales operates a similar but separately administered regime, so always confirm the position with your Local Planning Authority if your site is in Wales.
Roof-mounted solar on non-domestic buildings is the scenario permitted development covers most generously. As long as your installation satisfies the following conditions, no planning application is required.
Panels must not protrude more than 200mm beyond the plane of the roof slope or wall they’re mounted on, and the highest part of the installation must not exceed the highest part of the roof — excluding chimneys, flues and aerials. The equipment should, so far as practicable, be sited to minimise its effect on the building’s appearance and the amenity of the surrounding area, and removed as soon as reasonably possible once it’s no longer needed for generating electricity.
Flat-roof installations follow slightly different limits, since there’s no roof plane to measure protrusion against. Panels on angled mounting frames must not protrude more than one metre above the plane of the roof, and must sit at least one metre back from the external edge of the roof — a margin that also helps with maintenance access and fall protection.
- Roof structural load capacity for the panel and ballast weight
- Wind loading and ballast design for the mounting frames
- Safe maintenance and fire access routes are preserved
For the practical side of fitting panels on a commercial roof — mounting systems, ballast and access — see our dedicated complete guide to commercial solar installation.
Where roof space is unsuitable, shaded or too small, some businesses look at ground-mounted arrays on adjoining land instead. Permitted development rights for stand-alone solar within the grounds of a non-domestic building are considerably tighter than for rooftop systems, and are only really intended for smaller, self-consumption-scale installations.
The 9m² limit is designed for small, supplementary installations, not commercial-scale ground-mount solar. Any ground-mounted array intended to meaningfully offset a business’s electricity use — typically hundreds or thousands of square metres — will exceed these limits and require a full planning application.
Since December 2023, specific permitted development rights also cover solar canopies over non-domestic car parks — sometimes called solar carports. To qualify, the canopy must sit at least 10 metres from any boundary with residential property, meet height restrictions, and not function as the principal means of enclosing the land. Prior approval from the Local Planning Authority may still be required in some circumstances, so it’s worth discussing a car park canopy scheme with your council before committing to a design.
Permitted development rights don’t apply uniformly everywhere. Certain categories of site are treated more cautiously, regardless of how modest the installation is.
If your commercial building is listed — Grade I, II* or II — or falls within the curtilage of a listed building, permitted development rights for solar simply don’t apply. You’ll need listed building consent, and potentially full planning permission as well, regardless of how small or discreet the installation would otherwise be. You can check a building’s listed status on the Historic England National Heritage List for England before committing to a design.
In a conservation area or similar designated land, solar panels on a roof slope or wall that fronts a highway, or is otherwise visible from a public highway, fall outside permitted development and need a planning application. Panels on rear elevations or roof slopes that aren’t visible from a public road or footpath generally remain permitted development, but visibility is ultimately a judgement the Local Planning Authority makes based on the specific site.
Some Local Planning Authorities use Article 4 Directions to withdraw specific permitted development rights across a designated area, or attach conditions to an individual property’s planning history that remove them. This is uncommon for solar specifically, but it’s worth checking your council’s planning register, since it isn’t something you’d necessarily discover just by reading the national rules.
Pulling the conditions above together, here’s how the common scenarios compare.
| Scenario | Planning permission? | Notes |
|---|---|---|
| Standard roof-mount, non-listed building | Not usually needed | Meet the 200mm protrusion and roof-height conditions |
| Flat-roof commercial array | Not usually needed | Within 1m height and 1m edge setback limits |
| Small ground-mount, under 9m² | Not usually needed | Height, size and boundary limits apply |
| Commercial-scale ground-mount | Almost always required | Exceeds stand-alone permitted development limits |
| Listed building, any installation | Always required | Listed building consent, plus possibly planning permission |
| Conservation area, highway-facing | Required | Rear-facing installations often remain permitted development |
Very large, non-microgeneration installations may also trigger a lighter-touch “prior approval” process even where full planning permission isn’t otherwise required — the Local Planning Authority assesses design, external appearance and potential glare impact on neighbouring properties, typically within a 56-day determination period.
If your installation falls outside permitted development, the process is still relatively standard for most commercial solar proposals.
Building regulations approval applies to commercial solar installations regardless of whether planning permission is needed. A certified installer can usually self-certify compliance as part of the standard installation process.
Planning is rarely the only gatekeeper for larger commercial systems — grid connection capacity with your Distribution Network Operator can be a bigger constraint than planning permission in some areas, particularly where local networks are already heavily loaded. It’s worth investigating DNO capacity in parallel with, not after, your planning check.
- Not a listed building, and not within the curtilage of one
- Not in a conservation area, or the array faces away from any highway
- No Article 4 Direction removing permitted development rights locally
- Roof-mounted panels stay within 200mm protrusion (pitched) or 1m height/1m edge setback (flat)
- Installation doesn’t exceed the highest part of the roof
- Any ground-mount stays within the 4m height, 9m² area and 5m boundary limits
- Building regulations compliance confirmed with your installer
- DNO grid connection capacity checked for larger systems
- Local Planning Authority contacted to confirm the position for your site
- Most roof-mounted commercial solar in England is permitted development, with no planning application needed.
- The 1MW generation cap was removed in November 2023, opening the door to larger rooftop arrays without permission.
- Ground-mounted commercial arrays are far more restricted and almost always need a full application.
- Listed buildings always need consent; conservation areas restrict highway-facing installations.
- Always confirm the position with your Local Planning Authority before finalising a design — local conditions and Article 4 Directions can vary the national rules.
Not sure if your site needs permission?
We’ll assess your building, check the planning position and design a system that stays within permitted development wherever possible — with a clear plan if it doesn’t.
