PART 10 — CHANGE OF USEUpdated for the 2024 Ontario Building Code
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10.3.1.1.General
(1) Except as provided in Section 10.4., a building or part of a building subject to a change of major occupancy shall
conform to the requirements of Subsection 3.2.6., Sections 3.7., 3.11. and 3.12., Sentences 6.3.1.1.(2), 6.3.2.7.(1) and
6.2.4.7.(1), Subsections 9.5.1. and 9.5.3., 9.5.3A. to 9.5.3F. and 9.5.4., Sentences 9.6.1.4.(3), (4), Article 9.7.2.3.,
Sentences 9.8.8.1.(4) to (8) and 9.9.10.1.(1) to (7), Subsection 9.10.17., Sections 9.31. and 9.32., and Subsections 9.34.1.
to 9.34.3. as they apply to the new major occupancy that the building or part of a building is to support.
(2) Where a major occupancy is changed to a Group B, Division 2 major occupancy, heating, ventilating, and air
conditioning systems shall conform to the requirements of Sentence 6.2.1.1.(1).
(3) Where a major occupancy is changed to a Group B, Division 3 major occupancy, ventilation, air circulation, and
filtration systems, shall conform to the requirements of Sentence 6.2.1.1.(1).
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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.