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City planning: how long is an authorisation valid?

Verified 30 mai 2022 - Legal and Administrative Information Directorate (Prime Minister)

General case

The building permit, to, demolish or prior declaration of work have validity period of 3 years.

The authorisation is out of date if you have not started the work within 3 years or if, after this period, you interrupt it for more than 1 year.

This period of 3 years shall start from notification of the decision of the town hall. It is sent to you by registered mail (or by e-mail if you have accepted it on the permit application form).

Depending on how the notification is sent, the period of validity of your authorisation begins on the following date:

  • 1re email overview
  • The day after the date of sending the notification by electronic means

Without a written reply from the City Council, the period of validity is calculated from the date of the initial submission of the application. These provisions apply to non-opposition to a prior declaration when it concerns work.

You can request extension if you cannot start the work within 3 years. Authorisation may be extended 2 times for 1 year.

  Please note : the request for an extension only concerns city planning authorisations valid. It is granted only if the city planning rules and administrative duties remain the same.

The request must be made by mail in 2 copies.

It must be sent at least 2 months before the end of the period of validity (or before the end of your 1re request for extension).

Mail must be sent by registered letter with notice of receipt or deposited in the town hall.

Who shall I contact

The city hall has 2 months to respond. If your request for an extension has not been answered within 2 months, it is accepted.

Production of renewable energy (wind, solar panels...)

The validity period of a city planning authorisation is 3 years for energy production works using one of the renewable energy sources.

The city planning authorisation shall lapse if the work has not been put into service within 3 years except in cases of force majeure.

Based on the transmission mode of notification, the period of validity of your authorisation begins on the following date:

  • 1re email overview
  • The day after the date of sending the notification by electronic means

Without a written reply from the City Council, the period of validity is calculated from the date of the initial submission of the application. These provisions apply to the advance declaration when it concerns work.

You can request an extension of your authorisation which can be renewed annually, within 10 years of the issue of the authorisation (including the initial period of 3 years).

  Please note : The request for an extension is for city planning permissions only valid. It is granted only if the city planning rules and administrative duties remain the same.

The request must be made by mail in 2 copies.

It must be transmitted at least 2 months before the end of the period of validity (or before the end of your 1re request for extension).

In your mail, you must show that you cannot put your installation into service within 3 years for reasons beyond your control.

Mail must be sent by registered letter with notice of receipt or deposited in the town hall.

Who shall I contact

The city hall has 2 months to respond. If your request for an extension has not been answered within 2 months, it is accepted.