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OBC DIVISION B · PART 3 · SECTION 3.9 — PORTABLE CLASSROOMS

What are the exit requirements for portable classrooms in Ontario?

Portable classrooms must provide egress directly to the outdoors at or near grade, with doors, hardware and exterior steps, landings or ramps that let a class evacuate quickly. Travel distances inside a portable are inherently short, but the exterior stair, guard and ramp details must still comply.

Code reference
Egress provisions for portable classrooms rely on doors opening directly to the exterior of the single-storey building, sized and hardware-equipped for the classroom occupant load, with exterior landings, steps or ramps providing a safe route to grade. The number and arrangement of egress doors must suit the classroom layout so occupants are not trapped by a single blocked opening.
OBC Division B, Section 3.9.

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

What this means in practice

Because a portable is one room deep, egress compliance usually comes down to details rather than geometry: outswinging doors with panic-appropriate hardware, landings sized so the door does not sweep occupants off the step, guards on raised decks, and snow- and ice-manageable stairs. Barrier-free access matters too, at least a share of portables typically need ramped entry coordinated with the school board's accessibility plan. The classic deficiency is a second door blocked by furniture or facing an obstructed gap between closely spaced portables.

Plain language

Every portable classroom needs doors that open straight outside, with safe steps or a ramp down to the ground, so students can get out fast. The doors, railings and landings all follow the same safety logic as any school exit.

Related questions

When do the Ontario Building Code portable classroom rules apply?Do portable classrooms need a fire alarm system in Ontario?What foundations and anchorage do portable classrooms need 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.