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Permits and rules

Your home projects in Westmount

Westmount's rules summarized in plain English, project by project, checked on October 25, 2026.

PoolA certificate of authorization is required to build or install a pool (By-law 1634, s. 47, 17°).Shed or garageA building permit is required for an accessory building (By-law 1634, s. 38).Fence and hedgeA certificate of authorization is required to put up a fence or plant a hedge (By-law 1634, s. 47, 4°).Deck, patio or balconyA building permit is required for an accessory structure, decks included (By-law 1634, s. 38).Hot tubA certificate of authorization is required to install a hot tub (By-law 1634, s. 47, 17°).Home extensionA building permit is required for an extension (By-law 1634, s. 38).Basement apartmentA renovation permit, then a certificate of occupancy, are required (City page on accessory dwelling units).

Version française : vos projets à Westmount

Plain-English summaries of Westmount's by-law: the official French text prevails. 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

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