Ontario Building Code 2024

A standout feature of the 2024 Ontario Building Code (OBC) is its extensive harmonization with the National Building Code of Canada Effective as of January 1, 2025 , this update includes over 1,700 technical changes

Scope and applicability

• Applies to the construction, renovation, change of use, demolition, occupancy, and maintenance of buildings in Ontario, subject to statutory exclusions (e.g., certain farm buildings, temporary structures, some minor repairs).
• Applies to architects, engineers, designers, builders, contractors, municipal building officials, and owners where regulated by the Building Code Act, 1992.

: Applicants could use the 2024 OBC for new projects or continue using the 2012 OBC if they demonstrated that working drawings were substantially complete by December 31, 2024. ontario building code 2024

Part 7: Common Myths About the Ontario Building Code 2024

Myth 1: “The 2024 code only applies to new builds.” Fact: It applies to any renovation requiring a permit, including additions, basement finishing, and window replacement. A standout feature of the 2024 Ontario Building

Safety & Environment: Updates include revised standards for Radon protection, fire protection systems, and septic/sewage tanks. Applies to the construction, renovation, change of use,

8. Transition Rules and Grandfathering

• Permits applied before mandatory date: Can proceed under OBC 2012 for up to 2 years from permit issuance (must be under construction by Jan 1, 2027).
• Phased permits: If a permit covers multiple buildings, all buildings must meet the code in force on the date of the first permit application for that phase.
• Alternative solutions: Continue to be permitted under Division A, but must now reference OBC 2024 objectives.