The Ontario Building Code | Extension, Material Alteration or Repair
11.3.4.1. Extension, Material Alteration or Repair
(1) Despite Subsections 11.3.1. to 11.3.3., when an existing building is extended or subject to material alteration or repair, Part 7 applies,
(a) to the design and construction of plumbing in the extensions and those parts of the buildingsubject to material alteration and repair, and
(b) to plumbingwhich is adversely affected by the extension, alteration or repair.
11.3.5. Sewage Systems
In Plain Language
Extension, material alteration, or repair work collectively must meet the requirements set out in this article, tying together the renovation categories addressed in this Subsection.
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.