Solar Panel Planning Permission UK

In our experience installing solar panels across Wiltshire, the planning picture divides fairly cleanly into three groups. Understanding which group you fall into will save time and manage expectations before you book your survey.

Group one: standard properties with no complications. The majority of homeowners in Wiltshire — detached, semi-detached, or terraced homes in places like Chippenham, Trowbridge, Devizes, Swindon, and Salisbury's newer suburbs — face no planning hurdles at all. Permitted development covers the installation in full. We carry out a quick check at survey to confirm the panels will not exceed the 200mm protrusion or roofline height limits, note it on your file, and proceed to installation. No paperwork is submitted to the council.

Group two: conservation area properties. Wiltshire has an unusually high density of conservation areas — from Bradford-on-Avon's historic wool town centre to Marlborough High Street, Corsham town centre, and dozens of smaller village conservation areas across the county. In a conservation area, permitted development still applies in most cases. The critical rule is that panels cannot be installed on a roof slope or wall that faces a highway. In practice, this means rear-facing roof slopes — which typically face south and therefore make excellent solar candidates — are almost always permitted without application. Front-facing panels on a highway-facing slope would require planning permission, but this is rarely the configuration we recommend anyway for both planning and performance reasons. If you are unsure whether your property is in a conservation area, the Wiltshire Council online map is the definitive source, or we can check for you during your free survey.

Group three: listed buildings. If your property is listed — Grade I, Grade II*, or Grade II — you will need Listed Building Consent regardless of where you want to install the panels. This applies even for panels on outbuildings or garden structures within the curtilage. Wiltshire has the highest concentration of listed buildings of any county in England by land area, so this affects a meaningful share of our customers. The process is more involved but not prohibitive — we have completed successful installations on numerous Grade II listed properties across the county. See our listed buildings guide for the full approach and what to expect.

A source of confusion for many homeowners is the difference between permitted development (no application required), prior approval (a lighter-touch process), and full planning permission (a formal application). For solar panels, the distinction matters most in conservation areas and for commercial properties.

Prior approval is a procedural step sometimes required for certain permitted development works where the council wants to check specific details — typically appearance, materials, or siting. For domestic solar in conservation areas, prior approval is not generally required under current rules: you either fall within permitted development (rear-facing) or you need full planning permission (front-facing on a highway elevation). There is no middle-ground prior approval process for domestic solar in England as of 2026.

Full planning permission through a householder application is required where permitted development does not apply. The application is submitted through the Planning Portal, includes drawings and a site plan, and costs £258 for a householder application. Conservation officers at Wiltshire Council assess solar applications sympathetically in most cases, particularly for rear-facing installations that are not visible from public viewpoints. The key to a successful application is demonstrating that the panels are sited to minimise visual impact and that the installation is reversible — both of which are straightforward to evidence.

For commercial properties, the rules differ substantially. Roof-mounted solar on commercial and industrial buildings may qualify for permitted development under Schedule 2, Part 14 of the GPDO, subject to size limits and restrictions near aerodromes or in certain protected areas. Commercial installations above 50kW also require prior approval rather than full planning permission, which is a less onerous process but still requires submission to the local planning authority.

If you are in any doubt about which category applies to your property, the safest approach is to request a Lawful Development Certificate (LDC) from your local planning authority. This provides formal confirmation that your installation is lawful as permitted development. It is not required, but it gives certainty and can be helpful when selling the property.