Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
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The Ontario Building Code | Straight and Curved Runs in Stairs

9.8.3.1. Straight and Curved Runs in Stairs

(1) Except as provided in Sentence (2), stairs shall consist of,

(a) straight-runs, or

(b) curved-runs.

(2) Stairs within dwelling units shall consist of,

(a) straight-runs,

(b) curved-runs,

(c) straight-runs with winders, or

(d) straight-runs with curved-runs.

In Plain Language

This article addresses the requirements for straight and curved stair runs, covering how a stairway's shape affects its safety and usability.

This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.