Add doors and windows or replacing them with models that have different dimensions

Last updated August 30, 2022

Want to add a window to the façade on your building in Montréal, or replace a door in your house with a larger or smaller model? You must comply with the regulations in force, and you are required to obtain a permit.

In each Montréal borough, a permit is required to change the size of existing door or window openings and create new openings.

You are required to comply with natural lighting and ventilation standards for changing existing door and window openings or creating new ones.

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