Permits & Regulations••Added to ConstruWeb Sep 25, 2026
Ontario Building Code Changes for Second Suites, Multiplexes and ADUs
A practical overview of Ontario Building Code changes affecting additional residential units, multiplex conversions and garden suites.
Why This Is Useful
Helps homeowners and professionals identify the planning and code questions to raise before starting a multi-unit conversion.
Key Takeaways
- Confirm which edition of the Building Code applies to your permit application.
- Second suites and garden suites still require project-specific zoning and permit review.
- Use qualified designers and engineers where the proposed work requires them.
This third-party overview discusses changes relevant to second suites, multiplex conversions and additional dwelling units. Treat it as an introduction and confirm project requirements with your municipality and qualified professionals.
Source
Suite Additions
This video was created and is owned by Suite Additions. ConstruWeb embeds it from the original source and adds a summary.
ConstruWeb provides this information for general educational purposes. Requirements, fees and programs may change and may depend on the property, project and circumstances. Always verify current requirements with the appropriate government, regulatory or professional authority before beginning work.