OBC DIVISION B · PART 11 — RENOVATIONUpdated for the 2024 Ontario Building Code
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Section 11.2 — Classification of Existing Buildings
Full text of Section 11.2 (Classification of Existing Buildings) — Division B, Part 11 (Renovation) of the 2024 Ontario Building Code, with every article reproduced below.
11.2.1.Classification
11.2.1.1.Construction Index and Hazard Index permalink →
(1) Where proposed construction will result in the change of major occupancy of all or part of an existing building to
another major occupancy, the building shall be classified as to its,
(a) construction on the basis of its construction index as provided for in this Part, including Table 11.2.1.1.-A, and (See
Note A-11.2.1.1.(1)(a))
(b) occupancy on the basis of its hazard index as provided for in this Part, including Tables 11.2.1.1.-B to 11.2.1.1.-N.
(See Note A-11.2.1.1.(1)(b))
(2) Small or medium sized existing buildings as determined in Tables 11.2.1.1.-B to 11.2.1.1.-N facing multiple streets
may be assigned a hazard index credit of 1, which may be subtracted from the hazard index of the proposed major
occupancy to reduce the additional upgrading required by Table 11.4.3.4.-A provided,
(a) the building does not contain a Group B, Division 1, a Group C, or a Group F, Division 1 occupancy, and
(b) firefighting access complying with Articles 3.2.5.1. to 3.2.5.5. or Subsection 9.10.20. is provided.
r1 (3) The requirements of Articles 2.2.2.3. to 2.2.2.8. and 3.2.2.20. to 3.2.2.93. do not apply to this Part.
(4) For the purpose of this Part, the calculation of the construction index and hazard index for a Group G major
occupancy is permitted to be based on a Group F, Division 2 major occupancy.
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
11.2.1.2.Multiple Occupancies permalink →
(1) The classification of an existing building of multiple occupancy under Article 11.2.1.1. shall be applied according to
Articles 3.2.2.5. to 3.2.2.8.
11.2.1.3.Prohibition of Occupancy Combinations permalink →
(1) Nothing in this Part relieves an applicant from complying with the requirements of Article 2.2.1.2., 3.1.3.2. or
9.10.9.14.
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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.