In Ontario, a building permit is required for most construction, renovation, or structural alteration projects on your property. At Jomer Designs, we help ensure your project meets all municipal and provincial requirements so you can build with confidence and avoid costly delays.
Here’s a breakdown of common residential projects that typically require a permit:
Projects That Require a Permit
Decks over 24” (600 mm) above grade or attached to the house
Accessory structures like detached garages, sheds, or pool houses larger than 108 sq. ft. (10 m²)
Finished basements involving structural changes, new plumbing, or additional rooms
Additional Dwelling Units (ADUs) such as basement apartments or garden suites
Home additions including second-storey expansions, rear extensions, or bump-outs
Interior alterations involving load-bearing walls, new windows/doors, or plumbing modifications
New openings for windows, doors, or skylights in exterior walls
Excavation or underpinning work
Changing the use of a space (e.g., converting a garage into living space)
What Doesn’t Require a Permit?
While most structural work needs a permit, some minor projects are exempt:
Cosmetic upgrades like painting, flooring, or cabinetry
Fences (except around pools in some municipalities)
Sheds under 108 sq. ft. that don’t have plumbing or electrical
Decks under 24” from grade (check with your municipality for rail and zoning rules)
Why It Matters
Building without a permit can result in:
Stop-work orders
Fines or penalties
Issues with home resale or insurance
Required demolition of unauthorized work
How We Help
Jomer Designs provides detailed, code-compliant drawings and guidance through the permit application process. We’ll help you:
