Case Example (Illustrative) A new six-storey mixed-use residential building under OBC 2024: requires enhanced thermal envelope, blower-door testing target of 2.0 ACH50, mandatory HRV with zoned controls, sprinklering to the second and above floors, and restriction on combustible cladding materials above the second storey. Early energy modelling optimized window-to-wall ratio to meet performance path, and modular bathroom pods allowed faster onsite assembly under the Code’s off-site construction provisions.

The 2024 Code aligns Ontario closer to the National Energy Code. The biggest change here is airtightness.

: Stricter standards, including new requirements for barrier-free pedestrian entrances. HVAC & Plumbing

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

If your permit lapses or you request a major revision after 2024, the building official can require full compliance with the new code.

4.2 Fire Safety and Exterior Cladding