Planning Permission for Solar Panels in Lancashire: Rules You Need to Know
The vast majority of residential solar panel installations in Lancashire do not require planning permission. Permitted development rights allow homeowners to install panels on their roof without applying to the council, provided certain conditions are met. However, if your home is in a conservation area, is a listed building, or you want a ground-mounted system, the rules are more restrictive. Here is exactly what you need to know before commissioning your installation.
Standard Permitted Development Rules for Solar Panels
Under Part 14 of the General Permitted Development Order, you can install solar panels on a residential property without planning permission if: the panels do not project more than 200mm from the roof surface, the panels do not extend above the highest part of the roof (excluding chimneys), the panels are not installed on a wall facing a highway (for stand-alone systems), and the installation is not on a listed building or its curtilage.
For most Lancashire homes – terraces in Blackburn, semis in Preston, detached homes in the Ribble Valley – these conditions are easily met. Modern solar panels are typically 30mm to 40mm thick, and when mounted on a standard rail system, the total projection is around 80mm to 120mm, well within the 200mm limit. The panels sit below the ridge line on any normal pitched roof installation.
Conservation Areas in Lancashire
Lancashire has over 100 conservation areas across its boroughs, from the historic centres of Lancaster, Clitheroe and Whalley to Victorian terraces in parts of Blackburn and residential areas in Penwortham and Fulwood. In conservation areas, additional restrictions apply: solar panels must not be installed on a roof slope that faces a highway, and wall-mounted panels facing a highway are not permitted.
In practice, this means rear-facing panels are fine in conservation areas but front-facing panels visible from the road require planning permission. Since south-facing is optimal and the front of many Lancashire terraces faces north or east, this restriction often does not affect the best installation position. For homes where the south-facing roof is also the street-facing elevation, a planning application is needed.
Planning applications for solar panels in conservation areas are generally approved, as most councils recognise the environmental benefits. The application fee is £206, and the process takes approximately eight weeks. Including high-quality mockup images showing how the panels will look from the street strengthens your application.
Listed Buildings
Listed buildings always require listed building consent for solar panel installation, regardless of position. Lancashire has thousands of listed buildings, from grand houses in the Ribble Valley to mill workers’ cottages in Pendle and Victorian villas in Lancaster. The consent process assesses whether the panels will harm the character or appearance of the listed building.
Approval rates vary by council and by the specifics of the proposal. Panels on a hidden rear roof slope are more likely to be approved than on a prominent front elevation. The use of in-roof (integrated) panels rather than on-roof (mounted) panels can also improve the chances, as they sit flush with the roof surface and look less obtrusive.
Ground-mounted panels in the garden of a listed building may be an alternative if roof mounting is refused. These avoid any alteration to the building fabric and may be acceptable to the conservation officer. However, ground-mounted systems require their own planning considerations (see below).
Ground-Mounted Solar Panels
Ground-mounted solar systems are permitted development if: the installation is no more than 4 metres high, the array is no more than 9 square metres (approximately 4 to 5 panels), it is not within 5 metres of the property boundary, no part is within the curtilage of a listed building, and it is not closer to a highway than the nearest part of the building.
For larger ground-mounted arrays (which most Lancashire homeowners wanting a meaningful system will need), planning permission is required. Typical residential ground-mounted systems of 3kW to 4kW need 16 to 24 square metres, which exceeds the 9-square-metre permitted development limit. The planning application is straightforward, and approval rates are high for residential garden installations that do not create significant visual impact or neighbour amenity issues.
Ground-mounted systems are most common in rural Lancashire – farms, smallholdings and larger properties in the Ribble Valley, Forest of Bowland and Fylde where garden space is plentiful and roof orientation may not be ideal. They cost slightly more to install (£500 to £1,000 extra for mounting frames and groundwork) but can be optimally angled and oriented regardless of roof direction.
Flat Roof Installations
Flat roofs on houses, extensions and garages are common across Lancashire. Solar panels on flat roofs are permitted development under the same rules as pitched roofs, but they require angled mounting frames to achieve efficient generation. These frames tilt the panels to approximately 30 to 35 degrees, which can increase the total height above the roof surface.
The 200mm projection limit is measured from the plane of the roof to the highest point of the panel. With an angled frame on a flat roof, this limit can be challenging to meet. In practice, lower-angle mounting (15 to 20 degrees rather than 30 to 35) may be needed to comply, which slightly reduces output but avoids the need for planning permission.
Building Regulations for Solar Panels
Separate from planning permission, solar panel installations must comply with Building Regulations. This is handled by your installer through the relevant certification process. The key requirements are structural adequacy of the roof (it must support the weight of the panels, typically 15 to 20 kg per square metre), electrical safety (all wiring must comply with BS 7671 and be signed off by a qualified electrician), and fire safety (panels must not impede escape routes and must comply with fire spread requirements).
qualified installers self-certify compliance with Building Regulations and notify the local authority through an approved competent person scheme. You do not need to apply for Building Regulations separately – your installer handles everything. This is one of the key reasons to use a qualified installer rather than a general electrician.
Neighbour Considerations
Solar panels do not require neighbour consent, and neighbours cannot object to a permitted development installation. However, there are occasional concerns about glare from panels reflecting sunlight into neighbouring windows. Modern solar panels have anti-reflective coatings that minimise glare, and in practice, complaints are very rare. On the few occasions Lancashire councils have received glare complaints, they have generally been dismissed as unfounded.
If your panels are on a shared wall or party wall (possible with in-roof systems on terraced properties), the Party Wall Act may apply. In practice, standard on-roof mounted panels that do not involve structural work to the roof are not covered by the Act, but in-roof systems that involve modifications to the roof structure might be. Check with your installer if this applies to your property.
Do I need planning permission for solar panels in Lancashire?
Usually not. Most residential roof-mounted installations qualify as permitted development and need no planning application. Exceptions include listed buildings (which always need consent), conservation areas (if panels face a highway), and ground-mounted systems larger than 9 square metres. Your qualified installer will confirm permitted development compliance as part of the installation process.
Can I install solar panels in a conservation area?
Yes. In Lancashire conservation areas, solar panels are permitted development on roof slopes that do not face a highway. Panels on rear or side roof slopes facing away from the road can be installed without planning permission. If your best roof orientation faces the street, you will need a planning application (£206, eight-week process), which is generally approved given the environmental benefits.
How close to the boundary can I put ground-mounted solar panels?
Under permitted development, ground-mounted panels must be at least 5 metres from the property boundary and the array must not exceed 9 square metres. For larger systems or installations closer to the boundary, planning permission is required. In practice, most residential garden installations need planning permission because the 9-square-metre limit only accommodates 4 to 5 panels, which is too small for a meaningful system.
