Solar Panels and Planning Permission: What UK Homeowners Need to Know

Solar photovoltaic (PV) panels are now installed on over 1.3 million UK homes, and the pace of installation is accelerating thanks to falling hardware costs, the Smart Export Guarantee (SEG) tariff, and rising grid electricity prices. For most homeowners, installing solar panels on a standard house is straightforward: it falls within permitted development rights and doesn't require planning permission. But there are important exceptions — and getting the planning position wrong can mean retrospective applications, enforcement action, or complications at the point of sale.

This guide covers when you need (and don't need) planning permission, the DNO connection process, MCS certification, and the planning considerations for batteries and EV chargers installed alongside a solar system.

The Basics: Permitted Development for Solar Panels

Under Class A of Part 14 (Renewable Energy) of the Town and Country Planning (General Permitted Development) Order 2015 (the GPDO), solar panels installed on a house are permitted development — meaning they don't need a planning application — provided the following conditions are met:

Conditions for Roof-Mounted Solar PD

1. The building must be a dwellinghouse — Class A applies to houses (Use Class C3). Flat roofs, commercial buildings, and blocks of flats have different rules.

2. Not on a listed building — permitted development for solar panels does not apply to listed buildings. You need listed building consent (LBC) for any solar installation on a listed property, and approval is very rarely granted because panels affect the building's character and historic fabric.

3. Not in a World Heritage Site — solar panels on houses in World Heritage Sites are not permitted development (though see the section on Article 4 directions below for other designations).

4. The installation must not protrude more than 200mm from the roof surface — this rules out some tilt-frame systems on flat or shallow-pitched roofs, but in-roof systems and most standard on-roof domestic installations comply easily.

5. On the principal elevation, panels must not be visible from the highway — if panels are on the front roof slope and the front of the house faces a public road, permitted development does not apply. Rear-facing panels (by far the most common installation) are unaffected by this condition.

6. The array must be sited to minimise its effect on the external appearance of the building and amenity of the area — this is the "least obtrusive position" condition. In practice, it means choosing the position that achieves your energy goals while minimising visual impact. For most systems, this means the rear or least-visible roof slope.

The "least obtrusive position" condition is sometimes misread as requiring planning permission for any visible installation. It does not — it is a condition on the permitted development right itself, not a trigger requiring you to seek permission. Provided you choose a reasonable position (rear or side slope preferred over front elevation), you comply.

For a full breakdown of how permitted development rights work for homeowners more broadly — including extensions, outbuildings, and what removes PD rights — see our permitted development rights UK 2025 guide.

What About Flat-Roof Systems and Ground-Mounted Arrays?

• Flat roofs: Permitted development applies, but tilt-frame systems that raise panels more than 200mm above the roof surface may not comply with the protrusion limit. Check the system specifications.
• Ground-mounted arrays: Permitted development (Class B of Part 14) applies to free-standing solar arrays in domestic gardens, but with a stricter 9m² total array size limit and a condition that the ground-mounted system is removed when no longer needed. Larger ground-mounted arrays require full planning permission.

When You DO Need Planning Permission for Solar Panels

Listed Buildings

As noted above, planning permission alone is not sufficient for a listed building — you also need LBC. In practice, solar panels on listed buildings are almost never approved because they affect the building's character. Some Grade II listed buildings in less sensitive positions have obtained consent for in-roof systems using low-reflectance panels, but this is the exception. For guidance on listed building consent more broadly, see our listed building consent guide.

Conservation Areas

Solar panels in conservation areas are permitted development for rear roof slopes that are not visible from a public road or public space. However, if the panel would be visible from the street, permitted development does not apply and you need to submit a householder planning application.

Many conservation areas contain largely rear-garden-facing south-facing roofs — if your roof faces the rear and is not visible from the street, you can install under PD without planning permission even in a conservation area. Check your roof orientation carefully.

Article 4 Directions

An Article 4 Direction is a designation made by the local planning authority that removes specific permitted development rights from an area. Some local authorities have used Article 4 Directions to remove Class A Part 14 PD rights in particularly sensitive conservation areas or historic streetscapes.

If an Article 4 Direction removes Part 14 Class A rights in your area, you need planning permission even for a rear-facing system. Article 4 Directions are relatively rare for solar panels — far more common for extensions and outbuildings — but it's worth checking with your local authority if you're in a conservation area.

Roof-Mounted Systems Exceeding the Conditions

If your proposed installation doesn't comply with the PD conditions — for example, because it protrudes more than 200mm on a flat roof, or because you want panels on the front elevation facing the highway — you need to submit a householder planning application.

How to Apply If You Need Planning Permission

If your installation falls outside permitted development, you submit a householder planning application through the Planning Portal (planningportal.co.uk).

• Fee in England: £258 (as of 2024, subject to revision)
• Required documents: Site location plan, existing and proposed roof plan/elevations showing panel positions, Design and Access Statement
• Determination period: 8 weeks

For solar in conservation areas or near listed buildings, a heritage impact assessment may be requested. Discuss the application informally with the local authority planning officer before submission.

Lawful Development Certificate

Even where your installation is permitted development, it can be worth applying for a Lawful Development Certificate (LDC) to confirm PD status formally. An LDC costs £103 (half the householder application fee in England) and provides documentary evidence that the installation was lawful — useful at the point of sale and for mortgage purposes. It is not mandatory but provides peace of mind.

The DNO Connection Process

Installing solar panels is not just a planning matter — you also need to notify and connect to your Distribution Network Operator (DNO), the company responsible for the electricity distribution network in your area (e.g. Scottish Power Networks, UK Power Networks, Western Power Distribution).

G98 vs G99 Notification

The type of connection notification required depends on the size of your system:

Most domestic solar PV systems (3–5 kWp) on a single-phase supply require G98 notification. Larger systems, and any system that exports above the G98 threshold, require G99 approval.

Your MCS-certified installer will typically handle the DNO notification as part of the installation process. If they don't, ensure you understand which notification applies to your system.

Export Limitation

In some areas, particularly rural networks, the DNO may impose an export limitation — restricting how much electricity you can export to the grid. This doesn't prevent installation but affects the revenue you receive from exporting surplus power. Your installer should check export capacity with the DNO before installation.

MCS Certification and the Smart Export Guarantee (SEG)

What Is MCS?

The Microgeneration Certification Scheme (MCS) is an industry-backed certification scheme for small-scale renewable energy technologies. An MCS-certified solar installation means:

• The installer is accredited under the MCS scheme
• The equipment (panels, inverter) meets MCS product standards
• The installation is carried out to MCS workmanship standards
• A certificate is issued after installation

Why MCS Certification Matters

MCS certification is a requirement for accessing the Smart Export Guarantee (SEG), which is the tariff under which energy suppliers pay you for electricity you export to the grid. Without MCS certification:

• You cannot receive SEG payments
• Some mortgage lenders will not recognise the installation in their mortgage valuations
• Warranty claims against the installer may be more difficult to pursue

Always use an MCS-certified installer. Check accreditation at the MCS Installations Database at mcscertified.com.

The Smart Export Guarantee

The SEG replaced the Feed-in Tariff (which closed to new applications in 2019) and requires licensed electricity suppliers with 150,000+ customers to offer export tariffs to eligible generators. Key points:

• Export tariff rates: vary by supplier, typically 3–15p per kWh (compare carefully — Octopus, E.ON, and EDF have been among the more competitive)
• No generation payment: unlike the old FiT, the SEG pays only for electricity exported, not for all electricity generated
• Smart meter required: most SEG tariffs require a smart meter (or export meter) to measure actual export
• System size limit: currently available for systems up to 50 kW installed capacity

Solar Panel Planning for Batteries and EV Chargers

Many homeowners install a battery storage system alongside solar panels to store surplus generation for use in the evening. The planning position for batteries is:

• Indoor batteries (e.g. inside a garage, utility room, or loft): no planning permission required
• External batteries (mounted on an outside wall or in the garden): these are treated as permitted development under Class E (buildings and structures within the curtilage of a dwellinghouse) provided they don't exceed the size and siting conditions

In practice, most domestic battery systems (Tesla Powerwall, GivEnergy, Solis, etc.) are wall-mounted internally or in a garage and require no planning consent.

EV chargers installed at a domestic property are also generally permitted development under Class G of Part 2 of the GPDO, with the following conditions:

• The unit projects no more than 0.2 metres from the wall surface (for wall-mounted chargers)
• The charger is not installed on a Listed Building, in a World Heritage Site, or in certain other designated locations
• For cable routes crossing a private driveway or street, separate consent may be needed for any highway works

Common Questions

Do I need to tell my mortgage lender?

Strictly speaking, your mortgage terms typically require you to notify your lender of significant alterations to the property. In practice, most lenders have no objection to MCS-certified solar installations — they may increase the property's value and EPC rating. It is good practice to notify in writing.

Will solar panels affect my home insurance?

Yes — inform your insurer before installation. Most home insurance policies automatically extend to cover solar panels as part of the building structure, but you should confirm this and check the sum insured is updated to reflect the installation cost.

Do solar panels affect my EPC?

Yes, significantly. A 3–4 kWp solar PV system typically adds 8–15 SAP points to an EPC rating, and can push a C-rated home to B. See our full EPC guide for buyers and sellers for more on how ratings work and what improvements move the needle most. If your goal is specifically to improve an F or G rating, our EPC improvement guide covers the full SAP roadmap with grant eligibility.

Can I install solar panels on a flat roof?

Yes, subject to the 200mm protrusion limit for PD. Tilt-frame systems that raise panels to the optimal tilt angle (20–30°) often exceed this limit on a flat roof — in which case you need planning permission, which is generally granted for residential flat roofs.

Summary: Planning Permission Decision Tree

For most homeowners on standard residential properties with rear-facing south or south-west roof slopes, solar panels are permitted development. Instructing an MCS-certified installer who handles the DNO notification, building warrant (in Scotland), and MCS certificate will ensure your installation is fully compliant and SEG-eligible.