PART 11 — RENOVATIONUpdated for the 2024 Ontario Building Code
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11.4.2.6.Extension of Buildings of Combustible Construction
(1) The performance level of an existing building of combustible construction is reduced where the existing building is
extended by adding a storey or storeys such that the extended building will be more than four storeys in building height.
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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.