The Ontario Building Code | Suites
7.6.1.6. Suites
(1) Shut-off valves shall be installed in every suitein a building of residential occupancy as may be necessary to ensure that when the supply to one suite is shut off the supply to the remainder of the building is not interrupted.
In Plain Language
Individual suites need their own shut-off valve arrangement per this article, letting one unit's water be isolated for repairs without disrupting other suites in a multi-unit building.
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.