Permits in South Dundas
When a backyard shed, deck, or fence needs a building permit in South Dundas, Ontario, with the size cut-offs, coverage level, and source link.
Coverage
Municipal rule
Shed
A building permit is required for accessory structures larger than 10 m2 (108 sq ft); smaller detached storage structures may be exempt if they have no plumbing, subject to zoning setbacks.
Deck
Decks and other structural additions require a building permit under the town's building page.
Fence
Fences do not require a building permit but must comply with the local fence by-law; pool enclosures require a 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.
South Dundas permit questions
Do I need a permit to build a shed in South Dundas?
A building permit is required for accessory structures larger than 10 m2 (108 sq ft); smaller detached storage structures may be exempt if they have no plumbing, subject to zoning setbacks. Source: South Dundas building department, last checked 2026-07-03.
Do I need a permit for a deck in South Dundas?
Decks and other structural additions require a building permit under the town's building page.
Do I need a permit for a fence in South Dundas?
Fences do not require a building permit but must comply with the local fence by-law; pool enclosures require a permit.
Source
From South Dundas building department, last checked 2026-07-03. Permit payments: Most designs for Building Permits, not completed by the owner, will require a designer registered and/or qualified under the Ontario Building Code BCIN (an Architect or Engineer is exempt from this re
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: Cornwall, North Dundas, North Glengarry, North Stormont. Or see every municipality.