Ontario Building Code 2024 -

: Could still use the 2012 OBC if plans were substantially completed by December 31, 2024. City of Kingston Major Technical Changes

The 2024 Ontario Building Code is a proactive step toward building a safer, more sustainable, and efficient Ontario. By aligning with national standards and enabling innovative materials like mass timber, the new code sets a strong foundation for future development and addresses the urgent need for more housing in the province.

Updated requirements for fire protection and exiting. 4. Accessibility and Safety ontario building code 2024

4.5 Performance-Based Design and Off-Site Construction

While Ontario chose not to adopt the federal tiered energy code entirely in this specific iteration, the 2024 OBC updates energy calculations to keep pace with modern HVAC technologies and high-performance building envelopes. Builders will notice updated metrics regarding thermal bridging calculations, continuous insulation requirements, and stricter window-to-wall ratios for large-scale commercial developments. 4. Housing Innovation: Mechanical Plenums and Tiny Homes : Could still use the 2012 OBC if

: New requirements for rough-ins for sub-floor depressurization in all new homes. Carbon Monoxide

: Significant changes to residential ventilation (Part 9.32) to align with national standards. Fire Protection Updated requirements for fire protection and exiting

: Since April 1, 2025 , all building permit applications are reviewed strictly under the 2024 OBC.

The regulatory landscape for construction in Ontario has undergone its most historic transformation in over a decade. Filed by the Ministry of Municipal Affairs and Housing (MMAH) as , the 2024 Ontario Building Code (OBC) represents a massive modernization effort.