The Ontario Building Code | Extension of Buildings of Combustible Construction
11.4.3.7. Extension of buildings of Combustible Construction
(1) Where the performance level of an existing buildingis reduced under Article 11.4.2.6., the buildingshall be sprinklered.
Section 11.5. Compliance Alternatives
11.5.1. Compliance Alternatives
In Plain Language
Where extending a building of combustible construction reduces its performance level, the building must be sprinklered, as set out in this article, since sprinklers are considered essential compensation for the added fire risk of a taller combustible structure.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.