The province is serious about density. The new code eliminates many of the red tape barriers for laneway houses, garden suites, and basement apartments.
Coordination with national standards is a theme in Part 7 (Plumbing).
Confirm that building products and assemblies specified in new designs carry compliance certifications that match the updated 2024 standards. ontario building code 2024
Note: highlights focus on likely priority areas — consult the full text and municipal interpretations for definitive compliance.
The 2024 Ontario Building Code is not just an update—it is a fundamental overhaul designed to align the province with modern construction practices, sustainability goals, and safety standards. The province is serious about density
The 2024 code brings tailored updates to Part 9 (Housing and Small Buildings), focusing on practical, safe, and efficient residential construction [2]. The changes address building envelope efficiency, structural framing, and plumbing, while enhancing safety standards for residential homes. 4. Energy Efficiency and Sustainability
Clarified spatial definitions allow residential designs to maximize vertical space via lofts without triggering complex multi-story compliance paths. Confirm that building products and assemblies specified in
Since April 1, 2025, the 2024 OBC applies to every new complete permit submission.
The 2024 Code aligns Ontario closer to the National Energy Code. The biggest change here is airtightness.