Permits in Mississauga
When a backyard shed, deck, or fence needs a building permit in Mississauga, Ontario, with the size cut-offs, coverage level, and source link.
Coverage
Municipal rule
Shed
Mississauga lists a building permit for sheds greater than 15 square metres, or any size that contains plumbing. Its exemption for sheds less than 15 square metres applies only when the shed is one storey, free-standing, contains no plumbing, and is used for storage only. The published page does not state the rule for a shed exactly 15 square metres; confirm with the City before building at that size. Other buildings or structures greater than 10 square metres, or any size that contains plumbing, also need a permit.
Deck
A deck more than 600 mm (about 2 ft) above grade, or attached to the house, needs a permit. A deck under 600 mm does not.
Fence
Fences need no building permit; the fence bylaw caps height. Pool enclosures need a separate permit.
The provincial baseline
Under the Ontario Building Code, a detached one-storey storage shed of 15 square metres (about 160 square feet) or less, with no plumbing, does not need a building permit. Anything larger, with plumbing, or attached to another building does. Zoning rules (setbacks, height, lot coverage) always apply even when no building permit is needed.
Mississauga permit questions
Do I need a permit to build a shed in Mississauga?
Mississauga lists a building permit for sheds greater than 15 square metres, or any size that contains plumbing. Its exemption for sheds less than 15 square metres applies only when the shed is one storey, free-standing, contains no plumbing, and is used for storage only. The published page does not state the rule for a shed exactly 15 square metres; confirm with the City before building at that size. Other buildings or structures greater than 10 square metres, or any size that contains plumbing, also need a permit. Source: Mississauga building department, last checked 2026-06-24.
Do I need a permit for a deck in Mississauga?
A deck more than 600 mm (about 2 ft) above grade, or attached to the house, needs a permit. A deck under 600 mm does not.
Do I need a permit for a fence in Mississauga?
Fences need no building permit; the fence bylaw caps height. Pool enclosures need a separate permit.
Source
From Mississauga building department, last checked 2026-06-24. Mississauga separates sheds from other buildings: its page lists sheds greater than 15 square metres and other buildings or structures greater than 10 square metres, with plumbing exceptions for both. Shed threshold rechecked 2026-09-27; deck and fence summaries were not rechecked and remain last checked 2026-06-24.
This is a plain-language explainer, not legal or professional advice, and not the bylaw itself. Rules change and vary by zone within a city. Always confirm with your municipality's building department and the linked official page before you build. Decks and sheds near a conservation authority's regulated area may need a separate permit.
Other municipalities: Brampton, Caledon, Peel, Regional Municipality of, Addington Highlands. Or see every municipality.