11.3.1.1.Material Alteration or Repair of a Building System

(1) Where an existing building system is materially altered or repaired, the performance level of the building after the
         material alteration or repair shall be at least equal to the performance level of the building prior to the material alteration
         or repair. (See Note A-11.3.1.1.(1))

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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.