PART 11 — RENOVATIONUpdated for the 2024 Ontario Building Code
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11.4.2.1.Structural
(1) The performance level of an existing building is reduced where after proposed construction in all or part of an
existing building,
(a) the major occupancy will change to a different major occupancy,
(b) the occupant load will increase by more than 15%, or
(c) the live load will increase due to change in use within the same major occupancy,
and the existing structural floor and roof framing systems and their supporting members after the construction are not
adequate to support the proposed dead loads and live loads.
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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.