Four stair types that are both desirable and efficient for multiplex layouts were tested: Stacked, Flats, Scissor, and Single. These four types were tested in fourplexes through the schematic design at 1,140 different scales. These tests revealed efficiencies and drawbacks of the different stair types on different lot sizes.

It is important to note that Single stairs are currently not permitted under the Ontario Building Code as two means of egress are required. We included Single stairs in the first phase of this study as it may become a viable option in the future as the building code is updated.