Canadian building code question

What is the required corridor width under the Canadian building code?

The required corridor width depends on the corridor's role in the egress system, the occupancy served, the occupant load it must accommodate, barrier-free access requirements, and how the province adopts or amends the baseline provisions. There is no single number that applies to every corridor in every building.

Corridor width is one of those details that looks simple until you account for the variables behind it. The minimum width can change with the corridor's function, the occupancy classification, the occupant load being served, whether barrier-free access applies, door swings into the corridor, and how the province adopts the national model code. The safest approach is to confirm those project conditions first, then verify the cited requirement.

What to check first

  • Determine whether the corridor serves as an exit, access to exit, or a public corridor, because the applicable width provision can differ for each role.
  • Check the occupancy classification and occupant load, since these inputs often drive the minimum corridor width requirement.
  • Verify barrier-free access requirements and provincial adoption, as both can increase the minimum width beyond the baseline egress provision.

Jurisdiction notes

National baseline

Start with the NBC means-of-egress provisions for corridor width, including the general minimum and any occupancy-specific or occupant-load-based widths.

Province and edition check

Confirm how the province adopts or amends these provisions and whether the applicable code edition changes the width requirement for the building type.

Project-specific variables

Corridor function, occupancy, occupant load, barrier-free access obligations, door swings, and projections into the corridor can all change the required width.

Work through it in this order

  1. Identify the corridor's role in the building — exit corridor, access to exit, public corridor, or service corridor — and the occupancy it serves.
  2. Check the applicable means-of-egress and corridor width provisions in the NBC for the identified occupancy and occupant load.
  3. Verify barrier-free access requirements that may set a wider minimum, and confirm provincial adoption or amendment language.
  4. Document the cited sections and confirm that door swings, projections, and handrails do not reduce the usable width below the required minimum.

Common questions

Is the minimum corridor width the same for every building type in Canada?

No. The required width varies by occupancy, the corridor's egress function, the occupant load, and how the province adopts the code. Residential, commercial, and institutional buildings can have different requirements.

Does barrier-free access change the corridor width requirement?

It can. Barrier-free path-of-travel provisions may require a wider corridor than the general egress minimum, especially when two-way wheelchair passage or turning clearances apply.

Why does this page not give one specific corridor width?

Because the answer depends on the corridor's role, the occupancy, the occupant load, and the province. A single number without those project facts could be wrong for your building.