Ontario Building Code 2024 ((better)) -

The 2024 Ontario Building Code (O. Reg. 163/24), effective January 1, 2025, aligns with the 2020 National Building Code of Canada to reduce red tape. This update, mandatory by April 1, 2025, introduces significant changes regarding fire safety, accessibility, and environmental standards. Access the official provincial documentation at ontario.ca City of Welland 2024 Ontario Building Code - City of Welland

The 2024 OBC introduces a new structure, moving away from a single massive document to a concise regulation that references the 2020 National Building Code of Canada (NBC) alongside an Ontario Amendment Document for province-specific needs. Ontario Building Officials Association (OBOA) ontario building code 2024

Eased Restrictions: The code clarifies and simplifies the technical requirements for adding secondary units to existing properties, particularly regarding egress (exits) and fire separation.
Zoning vs. Building Code: While the OBC sets the safety standards, it works in tandem with provincial zoning orders to encourage density in established neighborhoods. The 2024 code ensures that safety requirements for ARUs are proportional to the risk, removing unnecessary barriers that previously made these projects financially unviable.

The 2024 Ontario Building Code (OBC) represents the most significant overhaul in the province's history, featuring over 1,700 technical changes. It officially came into effect on January 1, 2025, with the primary goal of harmonizing Ontario’s standards with the National Building Code of Canada to streamline construction across provinces. Key Highlights of the 2024 Edition The 2024 Ontario Building Code (O

Maximum riser height: Reduced from 200 mm (8 inches) to 190 mm.
Minimum tread depth: Increased from 255 mm to 280 mm (excluding nosing).
Handrail height: Standardized at 865–965 mm from the stair nosing.

Exception: Larger, more complex buildings (e.g., Part 3 major occupancies) have a delayed mandatory date of January 1, 2026 to allow design and engineering transitions. Eased Restrictions: The code clarifies and simplifies the