Code Library › Volume 1 › Section 9.8 — Stairs, Ramps, Handrails and Guards
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.8.3.1.Straight and Curved Runs in Stairs (See Notes A-9.8.3.1. and A-9.8.4.)

(1) Except as permitted in Sentence (2), stairs shall consist of (a) straight flights, (b) curved flights, or (c) spiral stairs. (2) Stairs within dwelling units and houses with a secondary suite, including their common spaces, shall consist of (a) straight flights, (b) except as provided in Sentence (4), curved flights, (c) except as provided in Sentence 9.8.4.7.(2), spiral stairs, (d) flights with rectangular treads and winders, or (e) flights with a mix of rectangular and tapered treads. (3) Curved flights in exits shall comply with Sentence 3.4.6.9.(2). (4) Spiral stairs shall comply with Article 9.8.4.7.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.