The Ontario Building Code | Occupancies of the Same Classification
3.1.2.2. Occupancies of the Same Classification
(1) Any building is deemed to be occupied by a single major occupancy, notwithstanding its use for more than one major occupancy, provided that all occupancies are classified as belonging to the same Group classification or, where the Group is divided into Divisions, as belonging to the same Division classification described in Table 3.1.2.1.
In Plain Language
If a building has multiple uses but all of them fall under the same Group (or the same Division within a Group) in Table 3.1.2.1, this clause treats the building as having a single major occupancy rather than a mixed one for classification purposes.
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.