National baseline
The NBC contains provisions for change of occupancy that address when a building must meet current code standards for the new use, including fire safety, structural, and accessibility requirements.
Canadian building code question
What building code applies to a change of occupancy in Canada?
A change of occupancy can trigger building code requirements that go beyond the original construction standard. The applicable provisions depend on the old and new occupancy classifications, the scope of physical work involved, whether the change triggers a full or partial compliance path, and how the province adopts the code for existing buildings.
Change-of-occupancy projects are among the most complex code-compliance scenarios because the building may need to meet requirements it was never designed for. The analysis depends on the old and new occupancy classifications, the extent of physical alterations, whether the new use increases fire-safety or structural demands, and how the province handles existing-building compliance. The safest approach is to identify the occupancy change first, then verify the compliance path under the applicable provincial code.
What to check first
- Identify both the current and proposed occupancy classifications, because the code obligations triggered by a change of occupancy depend on the difference between the two.
- Check whether the change triggers full compliance with current code or a partial compliance path, as many jurisdictions distinguish between these scenarios.
- Verify provincial adoption and any existing-building provisions, since provinces handle change-of-occupancy compliance differently.
Jurisdiction notes
Province and existing-building code
Provinces may adopt specific existing-building codes, compliance paths, or amendment language that governs how change-of-occupancy projects are evaluated.
Project-specific variables
Old and new occupancy, scope of physical alteration, fire-safety impact, structural adequacy, accessibility upgrades, and local enforcement interpretation can all change the compliance path.
Work through it in this order
- Identify the current occupancy classification and the proposed new occupancy classification for the building or space.
- Review the NBC change-of-occupancy provisions to determine what compliance path is triggered by that occupancy change.
- Check provincial adoption and any existing-building code provisions that may modify the compliance path or add specific requirements.
- Document the cited sections covering fire safety, structural, accessibility, and egress requirements triggered by the change before the design or permit submission proceeds.
Common questions
Does every change of occupancy require full compliance with current code?
Not always. Many jurisdictions provide a partial compliance path or existing-building provisions that scale the requirements based on the nature of the occupancy change and the scope of physical work.
What if the building is not being physically altered?
A change of occupancy can trigger code requirements even without physical alterations, because the new use may impose different fire-safety, structural, or accessibility demands.
How does the province affect the compliance path?
Provinces adopt change-of-occupancy provisions differently. Some have specific existing-building code frameworks, while others apply the current code with defined exceptions.