Planning permission for solar panels explained

Most domestic solar panel installations in the UK do not require formal planning permission, falling instead under "permitted development" (PD) rights. However, specific conditions apply, and properties in sensitive areas like Conservation Areas or those that are Listed Buildings have stricter rules. Understanding these regulations is crucial for homeowners considering solar energy.

Understanding permitted development rights for solar panels

What are permitted development rights?

Permitted Development (PD) rights are a type of planning permission granted automatically by national legislation, allowing certain types of development to proceed without a formal planning application to the local authority. This system is designed to streamline the process for common home improvements, including many solar panel installations. In England, these rights are set out in The Town and Country Planning (General PD) (England) Order 2015, with similar legislation existing in Wales and Scotland. If an installation meets all the specified conditions, no planning application or fee is required.

General conditions for domestic solar installations

For most homes, solar panels mounted on a roof or wall are considered PD, provided they meet certain conditions:

• Projection: Panels must not protrude more than 200mm from the surface of the roof or wall.
• Height: They must not be installed above the highest part of the roof, excluding the chimney.
• Visual impact: Panels should be sited, as far as practicable, to minimise their effect on the external appearance of the building and the amenity of the area.
• Removal: The equipment must be removed as soon as reasonably practicable when no longer needed.

Specific scenarios: when permission gets complex

While PD rights are generous, certain property types and locations introduce additional complexities.

Solar panels in conservation areas

Living in a conservation area does not automatically mean you need planning permission for solar panels; PD rights often still apply, but with additional restrictions.

• Wall-mounted panels: Solar panels must not be installed on a wall that faces a highway (a public road or path) in a conservation area or World Heritage Site.
• Roof-mounted panels: Panels on a rear or side roof slope not facing a highway often fall under PD. However, panels on a front or highway-facing roof slope in a conservation area usually need planning permission.
• Flat roofs: Changes in December 2023 relaxed requirements for flat roofs in conservation areas, meaning planning permission is no longer required for these installations, provided they meet standard flat roof conditions.
• Article 4 directions: Some conservation areas may have an Article 4 Direction, which can remove PD rights and require full planning permission for solar installations. It is always advisable to check with your local planning authority.

Listed buildings and solar PV

Properties that are Listed Buildings have the strictest rules, almost always requiring Listed Building Consent in addition to or instead of planning permission.

• Consent required: Any installation on a listed building requires Listed Building Consent if it affects the property's special interest, such as roof modifications or visible additions. Installing solar panels on a listed building without consent is a criminal offence.
• Preserving character: The installation must not affect the building's architectural style and original fabric. Applications often require detailed drawings, photos, and a heritage impact assessment to demonstrate how the panels will fit with the existing structure and minimise visual impact.
• Ecclesiastical exemption: Listed churches eligible for ecclesiastical exemption may require permission from the relevant denominational authority instead of Listed Building Consent, though planning permission may still be needed.

Flat roofs and ground-mounted solar

Rules for flat roofs and ground-mounted systems differ from pitched roof installations.

• Flat roofs: For flat roof installations, panels can protrude up to 600mm (0.6 metres) above the roof surface without planning permission, a significant relaxation from previous limits introduced in November/December 2023. They must also be at least 1 metre from any external edge of the roof.
• Ground-mounted solar: Ground-mounted solar panels are generally PD if they meet specific conditions:
  • The array must not exceed 9 square metres in area.
  • No single dimension (length, width, or depth) can exceed 3 metres.
  • The installation must not be higher than 4 metres at any point.
  • It must be positioned at least 5 metres from any property boundary.
  • Only one standalone ground-mounted installation is permitted per property under PD; any additional installations require planning permission.
  • In conservation areas or World Heritage Sites, ground-mounted panels must not be visible from a highway.

Solar panels on agricultural buildings

Installing solar panels on agricultural buildings may fall under PD, but there are size and location restrictions, and prior approval may be needed.

• Roof-mounted systems: These are generally simpler from a planning perspective. Panels installed on a wall or pitched roof should project no more than 200mm from the surface.
• Capacity limits: If the equipment is on the roof, the capacity for electricity generation across the whole site cannot exceed 1 megawatt.
• Ground-mounted systems: PD rights for ground-mounted solar on agricultural land are more limited. Smaller systems primarily for the farm's own energy use may qualify, but commercial-scale installations almost always require full planning permission.
• Restrictions: Solar panels must not be installed on a listed building or within the grounds of one, or on a site designated as a scheduled monument.

When formal planning permission is required

Exceeding permitted development limits

If your proposed solar panel installation does not meet all the conditions for PD, you will need to apply for formal planning permission. This includes situations where:

• Panels protrude beyond the specified limits from the roof or wall.
• The installation exceeds height restrictions.
• You plan for more than one ground-mounted array.
• The property is a Listed Building or within its curtilage.
• The property is in a conservation area and the panels would be on a highway-facing wall.
• Your PD rights have been removed, for example, by an Article 4 Direction.

Local authority specifics

Local planning authorities have specific policies and guidance that can supplement national PD rights, especially for sensitive areas. It is always best to check with your local council to confirm the current legislation and any local restrictions that may apply to your specific situation.

The planning application process

If planning permission is required, the process involves several steps.

Pre-application advice

Seeking pre-application advice from your local planning authority is highly recommended, especially for complex projects or properties in sensitive areas. This optional service allows you to discuss your proposal with a planning officer and receive early feedback on its feasibility and any potential issues before submitting a full application. It can help you understand relevant planning policies, identify if specialist input is needed, and improve the quality of your application, potentially saving time and reducing costs. While pre-application advice is not legally binding, it can significantly increase the likelihood of a successful outcome. Some local authorities may charge a fee for this service.

Submitting your application

A planning application is typically submitted online via your local council's planning portal. You will need to provide detailed documentation, including site plans, elevations showing the proposed installation, and often a statement justifying the benefits and demonstrating how visual impact will be minimised. For listed buildings, a Heritage Statement is crucial.

What happens after submission?

Once submitted, your application will be validated and then considered by the local planning authority. The statutory determination period for householder applications is typically 8 weeks, though complex cases can take longer. The council will assess the visual impact, compliance with local policies, and any other material considerations.

Planning permission vs building regulations

It's crucial to understand that planning permission and building regulations are distinct legal requirements.

Key differences

• Planning Permission focuses on the visual impact and land use aspects of a development, ensuring it aligns with local and national planning policies.
• Building Regulations are concerned with the structural safety, fire safety, and energy efficiency of the building work itself.

Ensuring compliance

All solar panel installations must comply with Building Regulations. The key areas of concern are:

• Structural safety (part A): Ensuring the roof can support the additional weight of the solar panels. A structural assessment is often required.
• Electrical safety (part P): Covering the electrical installation and connections to the mains supply.
• Fire safety (part B): Addressing any fire risks associated with the installation.

If you use an installer who is a member of an approved Competent Persons Scheme (CPS) and is Microgeneration Certification Scheme (MCS) certified, they can often self-certify that the work complies with Building Regulations, meaning you do not need to make a separate application yourself. However, it's important to note that MCS certification itself does not cover compliance with local building regulations, which are legally mandated to guarantee safety, health, and environmental protection in construction projects.

Navigating solar panel installation with confidence

Understanding the regulatory landscape for solar panels empowers you to make informed decisions and proceed with your installation confidently.

Consulting your local authority

The most reliable way to ensure compliance and avoid potential issues is to consult your local planning authority early in the process. Their guidance will be specific to your property and local context, offering a clear pathway forward.

Expert installation and support

Choosing a reputable, MCS-certified installer is vital. Fuse Energy, for instance, is MCS and TrustMark certified and handles planning approvals, paperwork, installation, and final checks for home solar. They can provide expert advice on both the technical aspects of installation and the regulatory requirements, helping to ensure your project meets all necessary standards and minimises visual impact where required. This clear guidance helps homeowners achieve energy independence without unnecessary hurdles, turning complex regulations into a navigable pathway.