Building permits in Mississauga

Mississauga lists a deck greater than 0.61 m high as requiring a building permit and a deck less than 600 mm high among projects that do not need one; the narrow 600–610 mm boundary is kept conservative.

Mississauga exempts a shed under 15 m² only when it is one storey, free-standing, storage-only and has no plumbing; the City lists a shed over 15 m² or any shed with plumbing as permit work.

Mississauga lists finishing a basement to create rooms/living space and basement apartments among projects requiring a building permit.

Mississauga lists a basement apartment/second unit among projects that require a building permit.

Mississauga requires permits for additions and new construction under the Building Code Act; project drawings and zoning requirements also apply.

Mississauga lists interior alterations among permit work, while cabinetry, painting and other listed cosmetic replacements can be exempt.

Mississauga lists structural work such as underpinning foundations and new/enlarged wall openings among building-permit projects.

Pool enclosure, grading, zoning and structure requirements should be confirmed through the City.

Mississauga lists detached garages and garages among projects requiring a building permit; small detached non-garage accessory structures have separate size exemptions.

Mississauga lists plumbing changes, furnace-duct alterations and certain heating equipment among permit work, while same-location fixture replacement is exempt. The exact permit depends on the trade scope.

Mississauga explicitly lists a fence among projects that do not need a building permit; zoning and other site-specific rules still apply.

Mississauga explicitly exempts a retaining wall less than 1 m high from a building permit.

Mississauga regulates residential demolition through its building-permit service and requires a permit application for demolition work; additional heritage or other approvals can apply.