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OBC DIVISION B · PART 3 · SECTION 3.2 — FUNCTIONAL STATEMENTS / BUILDING FIRE SAFETY

When are automatic sprinklers required in a building in Ontario?

Sprinklers are required by the applicable 3.2.2 construction article for many occupancies and sizes, and Ontario requires sprinkler protection throughout most new residential buildings more than three storeys, as well as care occupancies and retirement homes.

Code reference
Sprinkler requirements flow mainly from the construction articles, which tie permitted height, area and construction type to sprinklering. Systems must generally conform to NFPA 13, with NFPA 13R or 13D permitted for certain smaller residential buildings, and sprinklered status also relaxes other provisions such as travel distance and spatial separation.
OBC Division B, Subsection 3.2.2.

Paraphrased for clarity — open this provision in the BUILDAiD Library for the exact wording.

What this means in practice

On most Part 3 projects the practical question is not whether to sprinkler but which article and NFPA standard apply. Sprinklering typically unlocks larger areas, longer travel distances, reduced ratings and relief on limiting distance, so it is often chosen even when not strictly mandatory. Coordinate early on water supply and fire pump needs, and remember that hospitals, care homes and multi-unit residential buildings over three storeys are sprinklered in Ontario.

Plain language

Most larger new buildings in Ontario, and almost all new apartment buildings over three storeys, need sprinklers. Sprinklers also buy flexibility elsewhere in the design, so builders often add them even when the Code offers an unsprinklered option.

Related questions

When is noncombustible construction required under the Ontario Building Code?What are the fire department access route requirements under the Ontario Building Code?When is a fire alarm system required in a building in Ontario?

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This page is provided for general information. Building code requirements depend on your specific project, occupancy and municipality, and code editions change. Always verify requirements against the current Ontario Building Code and confirm with your local building department.