The Ontario Building Code | Increase in Occupant Load
11.4.2.2. Increase in Occupant Load
(1) Except as provided in Sentences 11.4.2.5.(2) and (3), the performance level of an existing building is reduced where proposed construction will increase the occupant load of an existing buildingby more than 15%.
(2) The performance level of an existing buildingis reduced where proposed construction will increase the occupant load by 15% or less and the new occupant load will be more than 15% above the occupant load for which a fire alarm system is required under Sentence 3.2.4.1.(2).
(3) The performance level of an existing buildingis reduced where proposed construction will increase the occupant load by 15% or less and the new occupant load will be more than 15% above the existing exit capacity as required under Article 3.4.3.2.
In Plain Language
Where a renovation increases a building's occupant load, this article sets out the additional requirements that apply to account for the greater number of people.
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.