PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code
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9.19.2.1.Access
(1) Every attic or roof space shall be provided with an access hatch where the attic or roof space
(a) measures not less than
(i) 10 m² in area,
(ii) 1 000 mm in length or width, and
(iii) 600 mm in height over at least the area described in Subclauses (i) and (ii), or
(b) contains a fuel-fired appliance.
(See Note A-9.19.2.1.(1))
(2) The hatch required in Sentence (1) shall be not less than 550 mm by 900 mm except that, where the hatch serves not
more than one dwelling unit, the hatch may be reduced to 0.32 m2 in area with no dimension less than 500 mm. (See
Note A-9.19.2.1.(2))
(3) Hatchways to attic or roof spaces shall be fitted with doors or covers.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.