Construction and renovation

Due to the COVID-19 outbreak and associated measures, the Urban Planning Department must unfortunately suspend its activities for an indefinite period of time. Until further notice, only permit requests for emergency work will be processed. By emergency work, we mean any work that can remedy a situation where human health and safety is jeopardized or the structural integrity of a building is compromised. Please note that the City of Westmount continues to provide essential services to citizens, such as snow removal, garbage, recycling and compost collection.

  • For plumbing emergencies, please call 514-989-5348
  • For other emergency work, call 514-989-5511
  • For all other emergencies, please contact the Public Safety Department at 514-989-5222

Here you will find all the steps and documentation required to obtain a permit. Revised submittal requirements will be enforced as of May 1st 2018. Please refer to item 3 below. At any time, you can reach the Urban Planning Department at 514 989-5219 to answer your questions.


The following works do not require a permit or certificate. However, the standards written in the regulations still apply.

  • Exterior and interior painting.
  • Repointing of masonry.
  • Re-surfacing of asphalt on a flat roof (white roofs are not required).

Generally, an architect is not required by law (Architects Act, Chapter A-21) for the construction, enlargement, reconstruction, renovation or alteration of:
-A detached single-family building;
-A single-family semi-detached or attached building, or a multi-family building (4 units maximum) that has a maximum height of 2 storeys and a maximum gross area of 300 m2 (areas above ground, from exterior face of walls).

An architect is not required for the alteration and renovation of the interior layout if the occupancy remains unchanged and no modifications are made to the structure, the fire separations or the exterior cladding.

Note: The number of basements and the use may have some impact on the above requirements.

Before 1980

Many homes built before 1980 contain asbestos: in old floor tiles, ceiling tiles, roof shingles and flashing, siding, insulation (around boilers, ducts, pipes, sheeting, fireplaces), pipe cement, and joint compound used on seams between pieces of sheet rock.

After 1980

For the purposes of this subdivision, gypsum boards and joint compounds manufactured after 1 January 1980 are deemed not to contain asbestos.


  • An inspection process follows the issuance of a permit.
  • Any modification to the project approved by Council for the issuance of the permit must be submitted for review and approval.
  • The City inspectors can and will proceed with site visits to enforce the regulations.
  • Upon a final inspection by the City inspectors, the permit or certificate file will be closed.

The most requested permits are illustrated below. Should you need assistance to direct your request, please contact the Urban Planning Department at (514) 989-5219.