The Ontario Building Code | Application
3.2.6.1. application
(1) This Subsection applies to a building,
(a) of Group A, D, E or F major occupancy classification that is more than,
(i) 36 m high, measured between grade and the floor level of the top storey, or
(ii) 18 m high, measured between grade and the floor level of the top storey, and in which the cumulative or total occupant load on or above any storeyabove grade, other than the first storey, divided by 1.8 times the width in metres of all exit stairs at that storey, exceeds 300,
(b) containing a Group B major occupancy in which the floor level of the highest storey of that major occupancy is more than 18 m above grade,
(c) containing a floor area or part of a floor area located above the third storey designed or intended as a Group B, Division 2 or 3 occupancy, and
(d) containing a Group C major occupancy whose floor level is more than 18 m abovegrade.
Note: On July 1, 2017, Sentence 3.2.6.1.(1) of Division B of the Regulation is amended by striking out "and" at the end of Clause (c) and by revoking Clause (d) and substituting the following: (See: O. Reg. 139/17, s. 32)
(d) containing a Group C major occupancy in which the floor level of the highest storey of that major occupancyis more than 18 m above grade, or
(e) containing a retirement home, where the floor level of the highest storey of the retirement homeis more than 18 m above grade.
In Plain Language
This clause defines when a building is classified as a high building (generally where occupied floors are far enough above the level firefighting ladders and equipment can reach), triggering the additional fire-safety requirements set out in the rest of this Subsection.
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.