The Ontario Building Code | Crawl Space Access
3.6.4.6. Crawl Space Access
(1) A crawl space shall have at least one access opening not less than 550 mm by 900 mm.
Section 3.7. Health Requirements
3.7.1. Height and Area of Rooms
In Plain Language
A crawl space needs at least one access opening measuring no less than 550 mm by 900 mm, ensuring the space can be entered for inspection, repairs, or servicing utilities routed through it.
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.