The Ontario Building Code applies province-wide, and each Durham municipality administers building permits locally. You generally need a permit for new buildings, additions, structural alterations, decks, garages, basement finishes, and plumbing changes. Applications go to the municipal building department with drawings; staff review for zoning compliance and Building Code conformity, then inspect at construction stages. Each municipality runs its own application portal, fee schedule and timelines. Small accessory sheds under a size threshold may be exempt — check the local rules rather than assuming. Heritage-designated properties need extra approvals before a permit issues. A permit confirms Code compliance; it does not rezone the property or override zoning restrictions. Verify requirements with the municipality before applying or building.
Building permits
This guide describes a research path — it does not decide what is allowed on a property. Confirm exceptions and amendments with the municipality.