☀️ Can I install solar panels without authorisation?

With conditions

Quick answer

Not without a formality in most cases. Installing solar panels (photovoltaic or thermal) on a house roof changes the external appearance: this generally requires a prior declaration of works at the town hall. In a protected area (near a historic monument, classified site), the Architecte des Bâtiments de France (ABF)'s opinion is required and may condition the project. Ground-mounted or high-power installations follow specific thresholds (declaration or building permit by surface and power). Also plan the grid connection (Enedis) if you sell the electricity.

📋 The rules

Roof panels: prior declaration of works in general
Protected area: ABF opinion required
Ground-mounted installations: rules by surface and power
High power / large surface: building permit possible
Plan the connection (Enedis) if you sell

🔓 Exceptions

Very small installations sometimes exempt (by town)
The PLU can ban or frame appearance/siting
Co-ownership must be consulted for installation on common parts

⚠️ Penalties & fines

Installing panels without the required prior declaration, or against the ABF's opinion in a protected area, is a planning offence: the town hall can require compliance, even removal, and fines can apply. An undeclared installation can also cause problems at a sale or for insurance. Better to file the declaration (review usually a month) before works.

📎 Official sources

Last verified: 2026-06-20

❓ Frequently asked

Do solar panels need authorisation?

Generally yes: a prior declaration of works at the town hall is needed for roof installation, as it changes the external appearance. In a protected area, the Architecte des Bâtiments de France's opinion is also required.

When is a building permit needed?

For large or high-power ground-mounted installations, and in some configurations. Roof panels on a house generally need only the prior declaration, unless specific local rules apply.

What happens in a protected area?

Near a historic monument or in a classified site, the Architecte des Bâtiments de France gives an opinion, which may impose constraints (colour, siting, integration) or refuse the project. Check with the town hall before buying equipment.

What's the risk without a declaration?

A planning offence: the town hall can require compliance, even removal, plus fines. An undeclared installation can also complicate a sale or cause an insurance issue.

And to sell the electricity?

You must plan the grid connection via Enedis and a contract (self-consumption with surplus sale, or full sale). These steps add to the planning authorisation and determine the pay for your output.

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