Westmount
Do you need a permit for a shed in Westmount?
A building permit is required for an accessory building (By-law 1634, s. 38).
Permit requiredA zone, a heritage area or a shoreline can have its own standards: with your address, the Radar reads your zone's grid and tells you what applies to your property.
The rules, in short
- Accessory buildings are allowed only in zones where the zoning grid says so. (art. 4.4.3.3)
- At most one storey or 4.88 m high, with no wall higher than 3.66 m. (art. 6.12, 1° and 2°)
- At most 46.45 m² on a lot under 371.61 m², 60.39 m² on a larger lot; at least 0.91 m from the house. (art. 6.12, 3° to 5°)
- May be built on the rear lot line (0.91 m from a lane) or on a side lot line if it adjoins a neighbouring building. (art. 5.3.5)
Summary by Radar Foncier, in our own words: the official French text of the by-law, linked above, prevails.
Applying in Westmount
- Urban planning department: 514 989-5219
- Permits on the municipality's website
Other projects in Westmount
Shed or garage elsewhere: Côte Saint-Luc, Dorval, Gatineau, Montreal, Sherbrooke, Vaudreuil-Dorion.
Version française de cette page
Source: Zoning By-law 1303 (administrative consolidation up to By-law 1641; accessory dwelling units: By-law 1657), French version, checked on October 25, 2026. Plain-English summary: the official French text prevails, and a by-law can change. Confirm with the Westmount urban planning department before buying materials. Radar Foncier is an independent service, not affiliated with the municipality.
Radar Foncier in English. Permits and rules for Québec homeowners; the full site and the reports are in French. Version française