Commercial solar planning permission in the UK — 2026 rules
Since the December 2023 GPDO amendment, most UK commercial rooftop solar sails through without planning permission. Here's the plain-English version of what needs consent, what's covered by permitted development, and what to do if your building is listed or in a conservation area.
Short answer
Non-domestic rooftop solar up to 1 MW does not need planning permission in England — it's permitted development. Between 1 MW and the design limit, a prior approval application covers appearance only. Listed buildings and Article 4 areas always need a full application.
The rules by scenario
Rooftop, non-domestic, under 1 MW
Covered by permitted development (Class J, Part 14, Schedule 2 GPDO). No planning permission needed if all conditions are met.
Rooftop, non-domestic, over 1 MW
Prior approval required — the local planning authority (LPA) assesses design and external appearance only. Typically decided within 56 days.
Listed buildings
Listed Building Consent is required regardless of size — even a small rooftop system. Practical to achieve on Grade II with sympathetic design; harder on Grade I / II*.
Conservation areas
Permitted development still applies on non-domestic roofs, but panels must not be on a wall facing a highway. Prior consultation with the LPA is recommended.
Article 4 directions
Some LPAs (parts of London, historic city centres) have Article 4 directions removing PD rights. A full planning application is then needed.
Ground-mount solar
Ground-mount over 50 kWp always needs a full planning application. Allow 3–6 months plus screening for landscape, ecology and heritage.
Rules here cover England. Scotland, Wales and Northern Ireland have similar but not identical GPDO equivalents — get local advice for those jurisdictions.
Permitted development conditions in detail
- Panels must not project more than 200 mm above the roof plane.
- Not fitted above the highest part of the roof.
- Not on a listed building or on a scheduled monument.
- In a conservation area, not on a wall facing a highway.
- Removed as soon as reasonably practicable when no longer used.
Prior approval — the 1 MW+ process
For arrays over 1 MW, prior approval is a lighter-touch consent focused only on design and external appearance. Submit drawings, elevations and a short design and access statement; the LPA has 56 days to determine. Approval fees are modest — a few hundred pounds — and refusal is rare when a competent designer is involved.
Listed buildings and heritage sites
Listed Building Consent is required and needs a heritage statement. Options that regularly get approved: rear-slope-only installs on Grade II farms and mills, integrated in-roof systems on new outbuildings, and ground-mount arrays screened by existing hedging or trees. Talk to the LPA conservation officer before you spend money on a design.
Related reading
FAQ
Do commercial solar panels need planning permission in the UK?
Usually no. Rooftop solar on non-domestic buildings up to 1 MW is covered by permitted development rights and does not need planning permission, provided a few conditions are met — panels not projecting more than 200 mm from the roof, not on a listed building, and not on a wall facing a highway in a conservation area.
What is the 1 MW threshold for commercial solar planning?
Since December 2023, rooftop commercial solar arrays up to 1 MW no longer need planning permission and go through permitted development. Arrays above 1 MW require prior approval from the local planning authority — a lighter-touch process than full planning.
Do listed buildings need planning permission for solar panels?
Yes. Listed Building Consent is always required, regardless of array size. It's often achievable on Grade II buildings with sympathetic design (matching colours, non-visible roof slopes) and much harder on Grade I or Grade II*.
Can I put solar on a warehouse in a conservation area?
Yes in most cases. Non-domestic permitted development still applies inside conservation areas, but the panels must not be on a wall that fronts a highway, and it's worth a pre-application chat with the LPA.
Do ground-mount commercial solar farms need planning?
Yes. Ground-mount systems above 50 kWp require full planning permission. Above 50 MW they become a Nationally Significant Infrastructure Project (NSIP) and go through the Development Consent Order route.
How long does prior approval take for a large rooftop array?
The LPA has 56 days to determine a prior approval application. Most decisions come back inside 6–8 weeks with no changes required, provided the design is sympathetic and the roof isn't listed.
Check the planning route for your site
We handle prior approval and any planning submission as part of the design service, at no extra cost on standard rooftop projects.