2024 Ontario Building Code: Essential Space and Doorway Standards for Residential Construction
Sarah's Expert Insight
OBC Compliance Specialist
"As the trend for secondary suites and ADUs grows in London, Oakville, and Muskoka, understanding the 13.5 m² minimum for combined spaces is vital for maximizing footprint efficiency without failing inspections. At empcontracting.ca Inc. your construction contractor in London, Ontario, we find that precisely planning the 860 mm hallway width early in the design phase prevents costly structural adjustments during the framing stage."
Introduction to OBC Residential Space Requirements
Navigating the 2024 Building Code Compendium is essential for any successful renovation or new build. At empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize these standards to ensure safety, accessibility, and legal compliance for every project.
9.5.3E. Combined Living Spaces
Minimum Area for Studio and Bachelor Units
According to Article 9.5.3E.1., where living, dining, bedroom, and kitchen spaces are combined into a single area (intended for no more than two persons), the total area must be no less than 13.5 m². This is a critical measurement for modern secondary suites and tiny home designs.
9.5.3F. Bathroom and Water Closet Room Standards
The code mandates that every dwelling unit must provide an enclosed space large enough to accommodate three primary fixtures: a water closet, a lavatory, and either a bathtub or a shower stall. Furthermore, any room containing a water closet must be equipped with a door to ensure privacy and separation.
9.5.4. Hallway Width Requirements
To maintain proper egress and flow, the standard unobstructed width for a hallway within a dwelling unit is 860 mm. However, Article 9.5.4.1. allows for a reduction to 710 mm if the hallway specifically serves only bedrooms and bathrooms at the furthest end and meets specific exit requirements, such as a second exit or direct exits from each bedroom.
9.5.5. Doorway Opening Sizes
Standard and Secondary Suite Specifications
Doorway openings must be designed to accommodate the standard sizes listed in OBC Table 9.5.5.1. for swing and folding doors. For secondary suites specifically, height requirements may be adjusted to 1,890 mm provided that the ceiling height meets the compliance standards set out in Sentence 9.5.3.1.(2).
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.