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Which city planning authorization for an enlargement or elevation?

Verified 09 February 2023 - Directorate for Legal and Administrative Information (Prime Minister)

Do you want to expand or raise your house? You will create a surface and change the exterior appearance of your building. An application for authorization is required. We're presenting the regulations.

Depending on the situation of your land and the surface area of your project, you must submit a preliminary declaration of works or a request for building permit.

You must check whether your construction is in an urban area of a municipality covered by a MORE: titleContent or a Land Use Plan (SOP).

You also need to know if your land is located in one of the protected areas. 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 surface area of your building.

Creation of 40 m² or less

An extension of more than 5 m² is subject to Advance Work Statement (AD) when sound ground right of way and sadness floor area are less than or equal to 40 m².

Warning  

If the extension brings the total floor area of the building to more than 150 m after the work, the use of an architect is required to file a building permit.

Creation of more than 40 m²

Your project is subject to building permit when sound ground right of way or sadness floor area is more than 40 m².

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 building project.

Creation of 20 m² or less

A project of more than 5 m² is subject to Advance Work Statement (AD) when sound ground right of way and sadness floor area are less than or equal to 20 m².

Creation of more than 20 m²

Your project is subject to building permit when sound ground right of way or its floor area is more than 20 m².

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 a project of area less than or equal to 20 m2.

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