To directly combat the housing shortage, the 2024 OBC includes regulatory relaxations for Additional Residential Units (ARUs), often referred to as laneway suites or garden suites.
Fire and life-safety
The 2024 Code officially came into effect on . To ensure ongoing projects aren't left in the lurch, the province implemented a three-month transition period: ontario building code 2024
The is a transformative update that prioritizes housing supply, energy efficiency, and accessibility while balancing industry readiness. Builders, designers, and municipalities face a steep learning curve but gain long-term benefits in streamlined approvals and lower operating costs for occupants. Mandatory compliance by July 1, 2025 (or Jan 1, 2026 for complex buildings) makes immediate education and design adaptation critical. To directly combat the housing shortage, the 2024
Insulation must now be installed over the full height of foundation walls for basements and heated crawlspaces, removing the previous 200mm gap allowance. Major Building and Structural Updates (Part 3 & 4) The 2024 Ontario Building Code Major Building and Structural Updates (Part 3 &
: Openable windows in residential units located 1.8m or higher above grade now require a guard, a window limiter, or must be positioned at least 900mm above the floor. Railing & Guard Heights For platforms 1.8m (approx. 5'11") or less above ground, a 900mm (36") guard is permitted.
Previously, rural residential buildings had slightly relaxed standards. The 2024 Code largely harmonizes rural and urban requirements, specifically regarding septic systems and structural loads (snow and wind).