Ontario Building Code 2024 __top__ -

The 2024 Ontario Building Code represents a fundamental shift in how buildings are designed, constructed, and regulated across the province. With over 1,700 items revised, the code touches every aspect of the construction industry.

| | Permit Submission Requirements | |---|---| | May 22 – December 31, 2024 | All projects submitted must conform to the 2012 OBC. | | January 1, 2025 – March 31, 2025 | Projects may use either the 2012 OBC (with proof of complete drawings before Jan 1, 2025) or the new 2024 OBC. | | April 1, 2025 Onward | All new building permit applications must be reviewed and comply with the 2024 OBC. |

: Increased prescriptive R-values for above-grade walls and roofs in both residential and commercial sectors. ontario building code 2024

The OAA's Practice Advisory Services team continues to update practice resource documents, including the OBC Data Matrices and various Practice Tips, to reflect 2024 OBC requirements.

For architects, engineers, developers, and contractors, understanding these updates is critical to maintaining compliance, avoiding project delays, and managing construction costs. 📅 Key Timelines and Transition Period The 2024 Ontario Building Code represents a fundamental

: Starting April 1, 2025 , all new permit applications must strictly adhere to the 2024 Building Code.

: Permit applicants can still use the 2012 Building Code for applications submitted before March 31, 2025 , provided they can prove working plans were substantially completed under the old code before December 31, 2024. Practical Resources | | January 1, 2025 – March 31,

4.2 Fire Safety and Exterior Cladding

will officially switch to testing against the 2024 standards. ontario.ca Key Technical Changes