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

3.18.2.2.Performance Level and Compensating Construction

(1) The performance level of a building after construction shall not be less than the performance level of the building prior to construction. (2) For the purposes of Sentence (1), reduction of performance level shall be determined in accordance with Articles 11.4.2.1., 11.4.2.3., 11.4.2.5. and 11.4.2.6. (3) Where proposed construction would reduce the performance level of an existing building, compensating construction shall be required in conformance with Articles 11.4.3.1., 11.4.3.2., 11.4.3.4., 11.4.3.6. and 11.4.3.7. (4) Section 11.5. applies in respect of the requirements of Sentences 11.4.3.4.(1), (3) and (4).
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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.