Most solar panel installations in England proceed without any planning application. But “most” is not “all,” and the exceptions — listed buildings, conservation areas, Article 4 direction areas, flats — catch projects regularly. Understanding exactly when Permitted Development rights apply, and what to do when they don’t, is the first compliance step for any UK solar installation.
This guide covers the rules for England in detail. Scotland and Wales have separate planning frameworks — see the relevant sections below for the key differences.
England-Specific Rules
The Permitted Development rights described here apply in England under the Town and Country Planning (General Permitted Development) (England) Order 2015 (SI 2015/596), as amended. Scotland operates under the Town and Country Planning (General Permitted Development) (Scotland) Amendment Order 2011. Wales has its own permitted development regime. Northern Ireland is covered by the Planning (General Development) Order (Northern Ireland) 2015.
What Is Permitted Development?
Permitted Development (PD) is a category of planning permission granted automatically by national legislation — not by the local planning authority — for specified types of development that meet defined conditions. If an installation meets all the relevant conditions, no planning application is required and no planning fee is payable.
Solar PV on domestic buildings in England is covered by Schedule 2, Part 14, Class A of the Town and Country Planning (General Permitted Development) (England) Order 2015 (GPDO 2015). Ground-mounted systems at dwellinghouses are covered by Class B.
Part 14 Class A: Roof-Mounted Solar PV
For a roof-mounted solar panel installation at a dwellinghouse to fall within Permitted Development under Class A, it must satisfy all of the following conditions:
| Condition | Requirement |
|---|---|
| Building type | Dwellinghouse only — not a flat, maisonette, or building converted to flats |
| Listed building | Not permitted on any listed building (Grade I, II*, or II) |
| Article 4 direction | PD rights removed if an Article 4 direction applies to the property |
| Roof protrusion | Panels must not project more than 200mm from the roof surface |
| Ridgeline | Panels must not extend beyond the highest point of the roof |
| Flat roof | Panels on a flat roof must not be visible from a highway |
| Conservation area | Prior Approval required if visible from a highway, waterway, or public footpath |
| World Heritage Site / AONB | As for conservation areas — Prior Approval required if visible |
| Appearance | Panels must be removed as soon as reasonably practicable when no longer needed |
The 200mm Rule
The 200mm protrusion limit is measured perpendicular from the roof surface — not vertically. For a standard pitched roof, the physical panel itself (typically 30–40mm thick) plus the mounting rail and bracket system must not exceed 200mm total projection from the tile or slate surface. Standard low-profile mounting systems sit comfortably within this limit.
Measure from the Roof Surface, Not the Rafters
The 200mm is measured from the roof surface (the tile or slate level), not from the structure beneath. A mounting system that sits on the roof batten with 20mm of clearance underneath the rail, then 45mm of rail height, then 35mm of panel frame, totals approximately 100mm of projection from the tile surface — well within the 200mm limit. Document your mounting system specification in the installation file.
The Ridgeline Condition
No part of the solar installation — panels, junction boxes, or any other component — can extend above the highest point of the roof as it existed before the installation. This condition rules out any configuration where panels are mounted vertically or at a steep angle on a shallow-pitch roof and extend above the ridge.
On a flat-roofed extension attached to a pitched-roof house, the relevant “highest point” is the highest point of the main roof — the flat extension is part of the same dwellinghouse.
When Permitted Development Does NOT Apply
Listed Buildings
Permitted Development rights do not apply to any building listed under the Planning (Listed Buildings and Conservation Areas) Act 1990, regardless of listing grade. This covers:
- Grade I — buildings of exceptional interest
- Grade II* (two star) — particularly important buildings
- Grade II — the largest category, covering the majority of listed buildings in England
For a listed building, all external works require Listed Building Consent (LBC). Solar panels are external works. The LBC application is assessed against the heritage significance of the building — applicants must demonstrate that the installation will not cause harm to the special architectural or historic interest of the building.
In practice, most Listed Building Consent applications for solar on listed buildings are refused or require extremely careful siting (e.g., on a non-visible rear elevation only, with no visible wiring or fixings on the historic fabric). Using solar design software to produce accurate visualisations of panel placement can support an LBC application by demonstrating minimal visual impact.
Listed Building Consent Is a Criminal Offence to Ignore
Installing solar panels on a listed building without Listed Building Consent is a criminal offence under section 9 of the Planning (Listed Buildings and Conservation Areas) Act 1990. Conviction can result in an unlimited fine or up to 2 years’ imprisonment. The local planning authority can also require the works to be reversed — at the owner’s expense — regardless of how long ago they were carried out. There is no time limit on enforcement for listed building offences.
Article 4 Direction Areas
A local planning authority can remove Permitted Development rights in specific areas by making an Article 4 Direction under Article 4 of the GPDO 2015. Article 4 directions are used in sensitive areas where the council wants direct control over development — typically conservation areas, areas of high housing density, or areas of special character.
If an Article 4 direction has removed Class A PD rights for solar panels in an area, a full planning application is required for any solar installation, even one that would otherwise meet all PD conditions. Check the local planning authority’s website or contact the planning department to confirm whether any Article 4 directions apply to a specific address.
Flats and Maisonettes
Class A Permitted Development rights for solar PV apply only to dwellinghouses. They do not apply to:
- Flats
- Maisonettes
- Buildings converted to flats
- HMOs (Houses in Multiple Occupation) — where the unit is not a single dwellinghouse
For solar on a flat or maisonette, a planning application to the local planning authority is required, assessing the installation against the local development plan. The freeholder’s permission will also typically be required under the terms of the lease.
Flat Roof Visibility
Class A, Part 14 states that solar panels on a flat roof must not be visible from a highway. This condition applies to the roof as a whole — if any panel on the flat roof is visible from any highway adjoining or near the property, PD rights do not apply and Prior Approval or a planning application is required.
“Visible from a highway” means visible under normal conditions to a person standing on the highway — it does not require the panels to be obviously prominent.
Conservation Areas and Prior Approval
Properties in conservation areas, World Heritage Sites, and Areas of Outstanding Natural Beauty (AONBs) are not automatically excluded from Permitted Development for solar — but an additional step called Prior Approval is required if the panels would be visible from a highway, waterway, or public footpath.
What Is Prior Approval?
Prior Approval is a lighter-touch process than a full planning application. The local planning authority (LPA) assesses only the siting and appearance of the installation — not the principle of the development. You submit:
- A description of the proposed installation
- Site location plan
- Roof plan showing panel positions
- Details of panel dimensions and colour
The LPA has 42 days from receipt of a valid application to respond. If no decision is issued within 42 days, the installation may proceed. LPAs approve the majority of Prior Approval applications for solar in conservation areas where the installation is on a rear slope not visible from a public highway.
Rear Slope First
In conservation areas, the simplest route to Prior Approval is to design the installation on the rear slope of the roof, away from the primary public highway. Many LPAs approve rear-slope installations in conservation areas without conditions. A front-slope installation visible from the street is more likely to require Prior Approval and may face conditions on panel colour or type.
Part 14 Class B: Ground-Mounted Systems
Ground-mounted solar PV at a dwellinghouse falls under Class B, Part 14, Schedule 2 of the GPDO 2015. PD rights for ground-mounted systems are more restrictive than for roof-mounted:
| Condition | Requirement |
|---|---|
| Panel area | Maximum 9 m² (or the area of the largest roof slope, whichever is smaller) |
| Height | Maximum 4 metres |
| Boundary setback | Must not be installed within 5 metres of a boundary |
| Number | Only one standalone installation per property |
| Listed buildings | Not permitted |
| Conservation areas | Requires Prior Approval |
| Proximity to original house | Must not be installed nearer to a highway than the principal elevation of the original house |
Ground-mounted systems larger than 9 m² require a full planning application. For commercial-scale ground-mounted systems, separate planning categories apply — including Environmental Impact Assessment requirements for larger arrays.
Scotland: Separate Planning Rules
Scotland has its own permitted development regime under the Town and Country Planning (General Permitted Development) (Scotland) Amendment Order 2011. The Scottish rules for domestic solar PV broadly follow the same principles as England — most domestic roof-mounted installations are permitted development — but there are differences in detail:
- Scotland has no directly equivalent “Prior Approval” process; instead, some installations in conservation areas may require a full planning application
- The Scottish Government’s planning guidance encourages solar installations but leaves detail to local planning authorities
- Listed buildings in Scotland are protected under the Planning (Listed Buildings and Conservation Areas) (Scotland) Act 1997
Contact the relevant Scottish local planning authority for site-specific advice.
Wales: Separate Planning Rules
Wales operates under the Town and Country Planning (General Permitted Development) Order 1995 (as amended for Wales), and Welsh Government planning policy. Solar PV on domestic buildings is generally permitted development in Wales under broadly similar conditions to England, but Welsh local planning authorities have developed their own supplementary guidance on installation standards in conservation areas and on listed buildings.
Part P Building Regulations: Electrical Safety
Regardless of whether planning permission is required, all fixed electrical installations in dwellings — including the AC electrical works for a solar PV system — are subject to Part P of the Building Regulations (England and Wales).
Part P requires that electrical installation work in dwellings:
- Is designed and installed to protect persons from fire and electrical injury
- Is notifiable to a Building Control Body
Competent Person Scheme
The most common route to Part P compliance for solar PV is through a Competent Person Scheme (CPS). A CPS-registered electrical installer can self-certify their work and notify Building Control on behalf of the homeowner, removing the need for a separate Building Regulations application.
The major CPS schemes for solar PV electrical work are:
| Scheme | Operator |
|---|---|
| NICEIC | Certsure LLP |
| NAPIT | National Association of Professional Inspectors and Testers |
| ELECSA | Certsure LLP |
| Stroma CERTASS | Stroma Certification |
An MCS-certified solar installer is typically also registered with one of these CPS schemes, covering both the PV installation standard (MCS 012) and the electrical self-certification (Part P) in a single certification.
Non-CPS Route
If the electrical contractor is not registered with a CPS, the homeowner must submit a Building Regulations application to the local authority Building Control (LABC) or an Approved Inspector before the electrical work begins. Building Control will inspect the completed work, issue a completion certificate, and confirm compliance with Part P.
Part P Applies to the Electrical Work, Not Just the Panels
The solar panels themselves are not Part P notifiable — the electrical installation (inverter wiring, consumer unit connection, isolator switches, generation meter wiring) is. A common compliance gap is where a solar company installs the panels and mounting but subcontracts the electrical connection to a contractor not registered with a CPS, without ensuring a Building Regulations application has been submitted.
Using Solar Design Software for Compliance Documentation
Solar software that generates accurate roof plans, electrical single-line diagrams, and equipment specifications simplifies planning and building regulations submissions. When a Prior Approval application is needed, having a precisely dimensioned roof plan showing panel positions and protrusion distances makes the application stronger and reduces requests for further information from the LPA.
For listed building applications, a solar design software tool that can produce rendered visualisations — showing how the installation will appear on the building — supports the heritage assessment that accompanies the Listed Building Consent application.
Produce Planning-Ready Roof Plans in SurgePV
SurgePV generates dimensioned roof plans and electrical diagrams formatted for UK planning submissions — including Prior Approval applications and Building Regulations packages.
Book a DemoNo commitment required · 20 minutes · Live project walkthrough
How to Check Before You Install
Before any UK solar installation, confirm the following:
Confirm the Building Type
Verify the property is a dwellinghouse — not a flat, maisonette, or HMO. Check the Land Registry title if in doubt. PD rights for solar under Class A, Part 14 apply only to dwellinghouses.
Check the Listing Status
Search Historic England’s National Heritage List for England (NHLE) at historicengland.org.uk using the property address. If the building is listed, Listed Building Consent is required before any work proceeds.
Check for Conservation Area and Article 4 Designations
Check the local planning authority’s online map or planning constraints database for the property address. Confirm whether any Article 4 direction removes PD rights for solar. If the property is in a conservation area, confirm whether the proposed installation would be visible from a highway — if so, Prior Approval is required.
Verify the Installation Meets PD Conditions
Confirm the panel mounting system will not protrude more than 200mm from the roof surface and no panel will extend above the ridge. Document the mounting system specification (total height from tile surface to panel top face) in the installation file.
Common Compliance Mistakes
| Mistake | Result |
|---|---|
| Assuming PD applies to flats | Planning breach — full application required |
| Missing Prior Approval in a conservation area | Potential enforcement notice and requirement to remove panels |
| Installing on a listed building without LBC | Criminal offence — unlimited fine, possible imprisonment |
| Contractor not on CPS and no Building Regs application | Part P non-compliance — affects building insurance and mortgage |
| Panels protrude more than 200mm | PD rights do not apply — retrospective planning application needed |
| Ground-mounted system over 9 m² without planning | Planning breach |
Related UK Compliance Guides
For the grid connection requirements that apply after planning, see the UK solar compliance hub covering G98 vs G99 and G99 application process. For installer certification requirements, see the MCS certification guide.
Frequently Asked Questions
Do I need planning permission to install solar panels in the UK?
Most domestic roof-mounted solar panel installations in England fall under Permitted Development rights and do not require a planning application, provided they meet the conditions in Schedule 2 Part 14 of the GPDO 2015. Key conditions are: panels must not protrude more than 200mm from the roof surface, panels must not extend above the highest point of the roof, and the installation must not be on a listed building or in an Article 4 direction area. If any condition cannot be met, a full planning application is required.
Can I install solar panels on a listed building?
No solar panel installation on a listed building in England is permitted under PD rights. All works to listed buildings require Listed Building Consent and, depending on the work, may also require planning permission. Listed Building Consent is required even for internal works that affect the character of the listed structure. The application is assessed against the heritage significance of the building, and the local planning authority must consult Historic England for Grade I and Grade II* listed buildings.
Do solar panels in a conservation area need planning permission?
Solar panels in a conservation area may require Prior Approval from the local planning authority before installation, even if the installation would otherwise meet PD criteria. The Prior Approval process assesses the siting and appearance of the installation. If the panels would be visible from a highway, public footpath, or waterway, Prior Approval is likely required. Check with the local planning authority before installing in a conservation area — rules vary between councils.
What are the size limits for ground-mounted solar under Permitted Development?
Ground-mounted solar PV systems at domestic properties fall under Class B of Part 14, Schedule 2 of the GPDO 2015. PD rights permit a standalone solar installation with a maximum panel area of 9 square metres, a maximum height of 4 metres, and a minimum 5-metre setback from any boundary. Only one standalone installation is permitted per property under PD rights. Larger systems require a full planning application.
What is the Part P building regulation requirement for solar PV?
Part P of the Building Regulations requires that fixed electrical installations in dwellings are designed and installed to protect persons from fire and electrical hazards. All new solar PV installations in dwellings are notifiable to a Building Control Body unless the installer is registered with a Competent Person Scheme such as NICEIC, NAPIT, or ELECSA. A CPS-registered installer self-certifies the work and notifies Building Control on the homeowner’s behalf. If the installer is not CPS-registered, the homeowner must separately notify the local authority Building Control before work begins.
