The Ontario Building Code | Plumbing
11.4.3.5. Plumbing
(1) Where the performance level of an existing buildingis reduced under Sentence 11.4.2.4.(1), upgrading of plumbingin the existing building which is adversely affected by the extension, alteration or repair shall be required in conformance with Part 7.
In Plain Language
Where a renovation reduces a building's performance level, plumbing adversely affected by the extension, alteration, or repair must be upgraded to conform with Part 7, as set out in this article.
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.