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Small Building

I don't think so.
(2024 Ontario Building Code Compendium, Table 3.5.2.1, item #2)

The referenced sentence 1.3.3.3(1) states:
Subject to Article 1.3.3.3B., Part 9 of Division B applies to all buildings described in Article 1.1.1.1. of 3 storeys or less in building height, having a building area not exceeding 600 m2, and used for major occupancies classified as
(a)reserved,
(b)Group C, residential occupancies other than buildings used for retirement homes, (See Note A-9.1.1.1.(1) of Division B)
(c)Group D, business and personal services occupancies,
(d)Group E, mercantile occupancies, or
(e)Group F, Divisions 2 and 3, medium- and low-hazard industrial occupancies.
 
BCINs are Ontario only. Important to note that having a designation from MMAH does not supersede registered design professional requirements in the professional practice acts.

Normally, the local architect and engineering society professional practice acts kick in for Part 3 buildings.

"small buildings" is usually considered Part 9, but some Part 9 elements may stray outside of what a small building designer would be able to practice (Part 4, 5, and 6).
 
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