Code Library › Volume 1 › Section 3.18 — Additional Requirements for Existing
PART 3 — FIRE PROTECTION, OCCUPANT SAFETY AND ACCESSIBILITYUpdated for the 2024 Ontario Building Code

3.18.2.1.Change of Use and Compensating Construction

(1) Where proposed construction will result in a change of use described in Subclauses 3.18.1.1.(1)(a)(i) to (iv) and (vi), additional construction shall be required in order that the building or part of a building subject to the change of use conforms to the requirements of Subsection 3.2.6. and Sections 3.7., 3.11. and 3.12. as they apply to the new major occupancy that the building or part of a building is to support. (2) For the purposes of this Article, existing buildings shall be classified as to their construction and occupancy as provided for in Sentence 11.2.1.1.(1).
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What triggers the additional Part 3 requirements for existing buildings in Ontario?What compliance alternatives exist for existing buildings under the Ontario Building Code?How does Section 3.18 relate to Part 11 renovation rules in Ontario?What upgrades are required when changing the use of an existing building in Ontario?

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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.