Do Solar Canopies Need Planning Permission? Class OA Explained

Planning is the question that stalls most solar canopy projects before they start. The good news for English commercial sites is that the rules changed decisively in your favour on 21 December 2023, when a new permitted development right — Class OA — came into force. It means the large majority of car-park canopies no longer need a full planning application. This guide explains exactly what Class OA covers, the conditions attached, how domestic canopies are treated, and why Wales, Scotland and Northern Ireland are a different story.

What Class OA actually is

Class OA is a permitted development right in England covering solar canopies built over non-domestic, off-street parking. In plain terms, that means the car park at a factory, office, retail park, hospital, school or leisure centre. Instead of a full planning application — with its months of committee dates, consultation cycles and uncertainty — Class OA lets you go through a lighter prior-approval route.

Prior approval is not a rubber stamp, and it is not “no planning at all”. It is a defined application to your local planning authority focused on three things: the siting of the canopy, its design and external appearance, and any glare it might cause to nearby road users, aircraft or neighbours. The council reviews those specific points and either approves them, requests changes, or (rarely, if a condition is breached) refuses. What it does not do is reopen the principle of whether solar canopies are acceptable — Parliament has already decided they are. That single shift removes most of the risk and delay that used to make canopy projects hard to justify.

The Class OA conditions, in order

The right comes with clear limits. Get any of these wrong and you fall outside Class OA and back into full planning, so they are worth reading carefully:

• Height: no part of the canopy may be more than 4 metres high. That is generous for a car park — enough for vans and most light commercial vehicles — but HGV yards may need design attention.
• Distance from homes: the canopy must be more than 10 metres from any dwelling. This protects residential neighbours from an imposing structure right on the boundary.
• Glare: the prior-approval application must address glare. Modern anti-reflective panels make this manageable, but sites near airfields, flight paths or busy junctions should expect scrutiny here.
• Heritage exclusions: Class OA does not apply to listed buildings or scheduled monuments. If your car park sits within the curtilage of a listed building, or on or beside a scheduled monument, you need a standard planning application (and likely listed building consent) instead.
• Drainage (SuDS): where the canopy is built over a permeable surface, a sustainable drainage condition applies — you must manage the run-off that the new hard cover creates, rather than simply shedding it onto the ground.
• Time limit: once prior approval is granted, development must start within 3 years.

None of these are onerous for a well-designed commercial canopy, but they are absolute. A turnkey installer should be sizing the structure and preparing the glare and drainage evidence with Class OA in mind from day one — not discovering a 4-metre clearance problem after the steel is ordered.

Why this matters commercially

Removing the full-planning hurdle changes the economics as well as the timeline. Canopies are not cheap to build — elevated structures run roughly £900–£1,400/kWp at commercial scale, rising to £1,200–£3,000/kWp for smaller or more complex builds, because the steel and foundations account for around 45% of the cost. That is more than rooftop solar (£700–£1,050/kWp), which is exactly why a payback of 8–12 years solar-only (or 7–11 with EV charging bundled in) needs a predictable, low-friction consent process to stack up. Every month shaved off the planning stage is a month sooner the system starts paying you back. You can see the full breakdown on our cost page, and model your own numbers before committing.

The direction of travel is also worth understanding. In May–June 2025 the government ran a call for evidence on making solar canopies mandatory on larger new car parks. It is important to be honest about status here: that is a call for evidence, not law. There is no requirement today. But it signals where policy is heading, and it is a sound reason to future-proof now rather than retrofit under compulsion later.

Real-world proof it works

This is not theoretical. The Princess Royal Hospital in Telford installed a 200 kW solar car-park canopy backed by £445,000 of Great British Energy funding, expected to save around £35,000 a year, with works from early 2026. Separately, DESNZ modelling in May 2025 estimated that an 80-space car park could save roughly £28,000 a year on electricity through self-consumption. Those are the kinds of figures that make a canopy sensible — provided the planning route is the streamlined one Class OA now offers. Public-sector and NHS sites in particular should look at our grants and funding guide for the schemes still open, and note which have closed.

Domestic canopies: a different set of rules

If you are covering a home driveway rather than a commercial car park, Class OA does not apply — but you are usually still fine. A domestic solar canopy or carport is generally treated as an outbuilding under householder permitted development, provided it meets the standard outbuilding tests:

• Maximum 4 metres high (reduced to 3 metres if it is within 2 metres of a boundary);
• Positioned behind the principal elevation of the house (i.e. not forward of the main front wall);
• Covering less than 50% of the curtilage — the land around your home — when combined with other outbuildings.

The important exceptions: listed buildings, conservation areas and National Parks need a planning application even for a modest domestic canopy. If your home falls into any of those, budget for the application and the extra time. For most standard houses, though, a driveway canopy is permitted development and can proceed without a full application. Our residential solar carports work covers this end of the market alongside larger schemes.

Wales, Scotland and Northern Ireland

Here is the single most important caveat in this guide: Class OA is an England-only right. It was made under the English planning system and has no effect elsewhere.

If your car park is in Wales, Scotland or Northern Ireland, a commercial solar canopy still needs standard planning permission. There is no equivalent prior-approval shortcut in place across those nations at the time of writing. That does not mean permission will be refused — canopies are viewed favourably almost everywhere — but it does mean a full application, with the associated timeline and consultation, rather than the lighter Class OA route. Factor that into your programme if you operate on either side of a border, because a project that is permitted development in Carlisle may need a full application a few miles away in Gretna.

The structural and grid boxes to tick

Planning is only one of the approvals a canopy needs, and it helps to see the whole picture. On the structural side, canopies are engineered to Eurocode 1 (BS EN 1991) for wind and snow loading, and foundations are typically ground screws (around 90% of sites), ballasted bases, or driven piles depending on ground conditions. Commercial construction is governed by CDM 2015, and the electrical work by BS 7671.

On the grid side, small systems up to 3.68 kW per phase use the G98 “fit and inform” process, but most commercial canopies exceed that and need G99 pre-approval from the network operator — allow roughly 4–8 weeks, sometimes 8–12. And if you want to claim the Smart Export Guarantee for the electricity you export, the installation must be MCS certified. A genuine turnkey installer handles all of this — structure, panels, electrical and the DNO connection — under a single contract, rather than leaving you to coordinate a bare frame supplier, an electrician and a planning consultant separately.

The honest summary

For an English commercial car park, the planning answer is now genuinely reassuring: Class OA permitted development means prior approval, not full planning, as long as you stay under 4 metres, keep 10 metres from homes, address glare and drainage, and avoid listed buildings and scheduled monuments. Domestic canopies are usually permitted development as outbuildings, with heritage and protected-landscape exceptions. Wales, Scotland and Northern Ireland still need standard planning permission — plan accordingly.

The best way to know exactly which route your specific site falls under is to have someone assess it properly: the surface type, the distance to the nearest dwelling, any heritage designations, and the grid connection. We are an MCS-certified, NICEIC and TrustMark-accredited installer and we handle the planning route, the structure and the connection as one project. Request a free quote or call +44 7707 970661 and we will tell you honestly which consent path applies to your car park — before you spend a penny on steel.