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Do you need a city planning permit to build attic?

Verified 27 January 2023 - Directorate for Legal and Administrative Information (Prime Minister)

Are you going to set up your attic? Several criteria will determine which city planning authorization you will need to request. We're presenting the regulations.

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Existing Slab

There is a slab in your attic with a ceiling height of more than 1 m 80 which constitutes floor area existing. And it can bear the burden of human activity? In this situation, you don't have to ask for permission.

Warning  

If you settle a roof window, you must file a Advance Work Statement (AD).

Creating Slabs

You build attic by creating a slab. You create floor area as soon as the ceiling height exceeds 1 m 80.

A prior declaration of works or a building permit may be required depending on the size of your development and the situation of the land.

You need to know whether or not your construction is located in an urban area of a municipality covered by a MORE: titleContent or a Land Use Plan (SOP).

You should also check if your home is located in a protected area. These are the remarkable heritage sites, the approaches to historic monuments, classified or pending sites, natural reserves, remarkable spaces and coastal environments to be preserved.

You can get this information from your city hall.

Who shall I contact
General case
Your construction is located in an urban area of a PLU

The choice of city planning authorization depends on the floor area of your layout.

Creation of 5 m² or less

You don't need any permission.

Warning  

Your project must comply with the MORE: titleContent, even if it is not subject to authorization. Before starting your work, you must consult the PLU or the city planning document in lieu in town hall.

Creation of 40 m² or less

Your project is subject to Advance Work Statement (AD).

Creation of more than 40 m²

Your project is subject to building permit.

Warning  

Depending on the surface of your house before or after the work, the use of an architect may be required to file a building permit.

Other situations

The choice of city planning authorization depends on the surface area of your development project.

Creation of 5 m² or less

You don't need any permission.

Creation of 20m² or less

Your project is subject to Advance Work Statement (AD).

Creation of more than 20 m²

Your project is subject to building permit.

Warning  

Depending on the surface of your house before or after the work, the use of an architect may be required to file a building permit.

Sectors protected

In these sectors, a Advance Work Statement (AD) is required for the construction of a area less than or equal to 20m2.

The sectors protected are:

  • Remarkable heritage sites
  • Historical monuments approaches
  • Site that is ranked or pending ranking
  • Natural reserves
  • Areas to be classified in the heart of a future national park
  • Heart of the national parks

Who can help me?

Find who can answer your questions in your region

  • For information on city planning regulations and administrative procedures

    Telephone administrative information - Allo Public Service

    The informants who answer you belong to the ministry in charge of housing and city planning.

    Cost: free service

    Attention: the service does not have access to users' personal files and therefore cannot provide information on their progress.

    The service is available at the following times:

    • Monday: 8.30am to 5.30pm
    • Tuesday: 8:30 to 12:15
    • Wednesday: 8:30 to 12:15
    • Thursday: 8.30am to 5.30pm
    • Friday: 1 p.m. to 4:15 p.m

  • For information on your local city planning plan or advance declaration file

    Town Hall