Permitted Development for Farm Solar Panels 2026: The Complete UK Guide

Most solar panel installations on UK farm buildings do not require planning permission. Under Class A of Part 6 of the Town and Country Planning (General Permitted Development) Order 2015 (GPDO 2015), roof-mounted solar on existing agricultural buildings is permitted development in England — provided all conditions are met. This guide explains exactly what those conditions are, when permitted development rights don’t apply, and how to protect yourself with a Lawful Development Certificate in borderline cases.

What is Permitted Development for Farm Solar?

Permitted development (PD) rights allow certain types of development to proceed without a formal planning application to your Local Planning Authority. For agricultural solar, the key legislation is Part 6 of the GPDO 2015, which grants PD rights for development on agricultural land and buildings.

Class A of Part 6 covers agricultural buildings and covers solar panel installation as a permitted development right under the broader principle of allowing works to agricultural buildings. The critical conditions that must all be met are:

• The solar installation is on an existing agricultural building (not a new structure built for the purpose)

• Panels do not protrude more than 200mm above the roof plane at any point

• The building is not listed (Grade I, II* or II in England)

• The site is not in a conservation area (or conditions are met within one)

• No Article 4 Direction is in place removing PD rights on your farm

• The farm is not in a SSSI without Natural England prior approval

The 200mm Rule Explained

The most commonly misunderstood condition is the 200mm protrusion limit. This means the furthest point of any solar panel — measured perpendicularly from the roof surface — must not exceed 200mm. For a pitched roof, this is the distance from the roof tiles to the underside of the panel frame, not the height above ground or ridge level.

Standard solar panel frames typically sit 30-100mm above the roof surface, so most installations comfortably meet the 200mm limit. Problems arise with certain ballasted systems on flat roofs where panels are tilted at an angle — in this case, the highest edge of the panel may exceed 200mm above the flat roof membrane.

If your proposed installation cannot meet the 200mm limit, you can either redesign to use lower-profile mounting systems, or apply for a full planning application to your LPA.

Ground-Mounted Solar: Class B Part 17

Ground-mounted solar arrays on agricultural land are subject to different PD provisions under Class B of Part 17 of the GPDO 2015 (as amended). This class permits solar PV on land, subject to conditions including maximum ground coverage thresholds and height limits. The specific thresholds have changed over successive amendments to the GPDO — always check the current version before relying on PD rights for ground-mounted systems.

Larger ground arrays — typically over 1MW or exceeding specified coverage areas — will require a full planning application. This will typically involve a Landscape and Visual Impact Assessment (LVIA) and may require an Environmental Impact Assessment for larger installations.

When Permitted Development Does NOT Apply

Permitted development rights are removed in several common agricultural scenarios:

• Listed buildings: Listed Building Consent is always required. PD rights do not apply to listed structures regardless of grade. See our separate guide on solar panels on listed farm buildings.

• Conservation areas: Class A conditions restrict installations in conservation areas. Pre-application advice from your LPA is strongly recommended.

• AONBs and National Parks: Permitted development rights are reduced in designated areas. Ground-mounted systems almost always require full planning permission.

• Article 4 Directions: Some LPAs have made Article 4 Directions removing specified PD rights in their area. Check with your LPA or solicitor if you’re unsure.

• New agricultural buildings: PD applies to works to existing buildings. A new barn built specifically to carry solar panels would be subject to separate agricultural PD provisions or require planning permission.

Lawful Development Certificates

A Lawful Development Certificate (LDC) is a formal decision from your LPA confirming that a proposed development is lawful (i.e., permitted development). You are not legally required to obtain an LDC — but it is strongly advisable in borderline cases, or where you want certainty for financing or sale purposes.

An LDC application costs £206-£600 depending on the authority (2026 fees) and is determined within 8 weeks. If granted, it provides legally binding confirmation that your installation is permitted development. If refused, you have the right of appeal and will know that a full planning application is required before proceeding.

We recommend an LDC application where: the 200mm limit is marginal; the farm is near the boundary of a conservation area; the building’s agricultural status could be questioned; or where the installation is being financed and the lender requires planning certainty.

Scotland and Wales

Scotland has equivalent PD provisions under the Town and Country Planning (General Permitted Development) (Scotland) Order 1992 (as amended). The conditions are broadly similar, with Class 18 covering agricultural solar. Specific local variations apply in Highland Council’s area and in National Scenic Areas.

Wales operates under the Town and Country Planning (General Permitted Development) Order 1995 (Wales). Class A of Part 6 permits solar on agricultural buildings subject to comparable conditions. Planning Policy Wales Edition 12 is explicitly supportive of renewable energy on farms. Pre-application service is available from all Welsh LPAs.

Getting Specialist Advice

If you are unsure whether your proposed installation qualifies as permitted development, the options are:

• Speak to your LPA’s duty planner — most LPAs offer free pre-application advice by telephone or email

• Contact our team — we can advise on PD eligibility based on your specific building and system design

• Apply for an LDC — provides legal certainty for a modest fee

Never rely solely on a general guide like this one for specific planning decisions. Planning law changes frequently and local variations apply. Always verify with your LPA or a planning consultant before proceeding with any borderline installation.

For the broader planning process and hub page, see our Planning Permission for Farm Solar guide.

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