Start with the municipality and the exact work.
Permit requirements depend on what changes, where the property is located, and how the building is used.
Prepare a simple existing-versus-proposed scope: walls, openings, plumbing, HVAC, electrical, basement use, exits, fire separations, occupancy, and structural work. Send that information to the applicable municipal building department or qualified designer instead of relying on a general rule from another city.
Work that commonly needs closer review
Toronto identifies additions, structural or material alterations, new or enlarged openings, some basement work, new or modified plumbing or heating systems, second suites, changes of use, and demolition among work that may require a permit. This is not an exhaustive list, and neighbouring GTA municipalities administer their own applications.
Work that may be simpler
Toronto lists examples such as cabinetry and millwork, replacing plumbing fixtures, replacing roofing without structural work, and some like-for-like window or door replacements as work that may not require a building permit. Zoning, condominium rules, electrical requirements, heritage restrictions, and other approvals can still apply.
Build the document list early
- Existing and proposed plans with dimensions.
- Structural or engineering information when applicable.
- Designer qualifications and responsibility information.
- Condominium or property approval requirements.
- Product, fire-rating, accessibility, and assembly information relevant to the scope.
- A plan for permit inspections and closeout records.
Assign responsibility in writing
Confirm who determines permit requirements, prepares drawings, submits, answers municipal comments, pays fees, books inspections, and provides final records. The property owner remains responsible for compliance, even when consultants or contractors assist.