The Ontario Building Code | Washroom Facilities
3.9.3.8. washroom Facilities
(1) washroom facilities need not be provided in a portable classroom where the facilities in the main school buildingcomply with the requirements of Subsection 3.7.4. for the total occupant load of the main school buildingand the portable classrooms.
In Plain Language
Washroom facilities need not be provided in a portable classroom if the main school building's facilities already meet the combined occupant load requirements for both the school and its portables.
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.