Rooftop solar panels: when a house needs permission
Solar on an ordinary house rarely needs an application. The exceptions are listed buildings, Article 4 areas, front elevations and anything on a flat.
Most rooftop solar on an ordinary house in England goes ahead without a planning application, because Part 14 of the General Permitted Development Order 2015 grants permitted development rights for microgeneration equipment. Solar panel planning permission becomes necessary when the installation breaks one of the limits in Class A, or when the building or its location takes the rights away altogether.
The limits are short. The exceptions are where the money gets spent.
The permitted development route for domestic solar
Class A of Part 14 covers solar photovoltaic and solar thermal equipment installed on a dwellinghouse or on a building within its curtilage, such as a garage or a garden building. Class B covers stand-alone solar within the curtilage, which is the route for a ground-mounted array in a garden.
Two conditions apply throughout. The equipment has to be sited, so far as practicable, to minimise its effect on the external appearance of the building and on the amenity of the area. And it has to be removed as soon as reasonably practicable when it is no longer needed for microgeneration.
That first condition is more than decoration. It is why an installer who puts panels across a front elevation when the rear roof faces almost as favourably can create a problem that did not need to exist.
The projection and siting limits that matter
Class A sets limits on how far the equipment may project beyond the plane of the wall or the roof slope, measured perpendicular to that surface, and prevents the highest part of the installation sitting above the highest part of the roof, excluding any chimney.
Part 14 has been amended more than once, most recently to reflect changes in panel and mounting design, so take the current projection figure from the text of Class A on legislation.gov.uk rather than from an installer's brochure or an older article. Flush-mounted panels on a pitched roof are almost never a problem. Tilted frames on a flat roof frequently are, because the frame lifts the highest point and increases the projection at the same time.
Ground-mounted arrays under Class B carry their own limits on height and area, and only one stand-alone installation is permitted within the curtilage.
Measure before you order. Where a roof has already been re-covered with a thicker insulation build-up, or where the mounting system sits on rails above battens rather than on hooks through them, the projection can creep past the limit without anyone intending it.
Listed buildings and why consent is separate
Permitted development rights do not extend to installing solar equipment on a listed building or within the curtilage of one, and they do not apply to a scheduled monument.
Listed building consent is a separate regime under the Planning (Listed Buildings and Conservation Areas) Act 1990, and it is needed for works affecting the character of the building as a building of special interest whether or not planning permission is also required. Carrying out those works without consent is a criminal offence. Read that sentence again before you agree an installation date.
Curtilage matters as well as the building itself. An unlisted barn or garage in the grounds of a listed house can be treated as curtilage listed if it predates 1948 and was in the same ownership, which surprises owners who assumed only the house was protected.
Consent is not impossible. Applications succeed where panels sit on a rear or inner roof slope invisible from public view, on an outbuilding, or on a modern extension. The case is made through a Heritage Statement that identifies what makes the building special and explains why the proposed position causes little or no harm to it.
Conservation areas, Article 4 directions and front roof slopes
In a conservation area or a World Heritage Site, Class A does not permit installation on a wall that fronts a highway. Panels on a rear roof slope or on a side elevation set away from the street generally remain permitted development, subject to the other limits.
An Article 4 direction can remove the rights entirely for a defined area, and many councils have made them for conservation areas and for particular streets. Check the council's Article 4 register before ordering anything, and read the published conservation area appraisal if you need to make a case for a visible position.
Where an application is needed in a conservation area, it is a householder application judged against the statutory duty to pay special attention to preserving or enhancing the character or appearance of the area.
Flats, maisonettes and shared roofs
Householder permitted development rights under Part 1 do not apply to flats, and the position for solar equipment on a block of flats depends on the current wording of Part 14, so check it rather than assuming.
Even where planning is not an obstacle, ownership usually is. The roof of a block is almost always retained by the freeholder, and installing on it requires their consent and a licence to alter, which is a private law matter the council will not resolve. Start with the lease.
Heat pumps and batteries alongside panels
Households increasingly install solar with a battery and a heat pump at the same time. Each has its own route.
| Equipment | Usual planning route |
|---|---|
| Roof-mounted solar panels | Part 14 Class A, subject to the limits |
| Ground-mounted array in a garden | Part 14 Class B, one only, with height and area limits |
| Air source heat pump | Part 14 Class G, subject to a noise standard and siting limits |
| Battery storage inside the house or garage | Normally no planning issue, but building regulations apply |
An outdoor battery enclosure in a garden may fall under householder rights for outbuildings, depending on its size and position. Where several items go in together, it is worth checking each one against its own class rather than treating the package as a single project.
Recording that your installation was lawful
Permitted development is a right, not a document, and nothing arrives to prove you used it correctly. Conveyancing solicitors ask.
A Lawful Development Certificate for proposed or existing development under sections 191 and 192 of the Town and Country Planning Act 1990 is the only formal way to confirm that works are lawful. It costs a fee and takes eight weeks, and on a straightforward flush installation on a rear roof slope most people do not bother. On a marginal case, a listed building, or a house you expect to sell soon, it is money well spent.
Keep the installer's drawings, the panel and mounting specification, dated photographs and the electrical certification in one file either way. The same discipline pays off on other householder projects where permitted development limits decide the answer, including a swimming pool, indoors or outdoors.
If your installation does need an application, a Planning Statement explaining the design choices helps a case officer say yes, and you can check what else the application may need first. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
Do I need planning permission for solar panels on my house?
Usually not. Class A of Part 14 of the General Permitted Development Order 2015 permits solar equipment on a dwellinghouse subject to limits on projection beyond the roof plane and on height relative to the ridge. Permission is needed if you exceed those limits, or if the building is listed or covered by an Article 4 direction.
Can I put solar panels on a listed building?
Permitted development rights do not apply, so you need listed building consent and usually planning permission too. Consent is granted where panels sit on a rear or inner roof slope out of public view, on an outbuilding or on a modern extension. Carrying out the works without consent is a criminal offence.
What are the rules in a conservation area?
Class A does not permit installation on a wall fronting a highway in a conservation area or World Heritage Site. Rear roof slopes and side elevations set back from the street normally remain permitted development. An Article 4 direction can remove the rights entirely, so check the council's register before ordering equipment.
Does the flat roof of a garage change anything?
It often does. A tilted mounting frame lifts the highest part of the installation and increases the projection beyond the roof plane at the same time, which is how flat roof arrays break the Class A limits. Flush installations on pitched roofs rarely cause difficulty. Check the current projection figure in Class A.
How do I prove my installation was lawful?
Apply for a Lawful Development Certificate under section 191 or 192 of the Town and Country Planning Act 1990, which is the only formal way to confirm works are lawful. It costs a fee and takes about eight weeks. Otherwise keep the installer's drawings, panel specification, dated photographs and electrical certification together.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.