If only the room's use changes, does Ottawa need a permit?

The City of Ottawa's permit guidance does not give a clear yes or no for a change of room use where no walls move and no plumbing changes. That gap means the answer depends on the specifics of your project, and the City's Building Code Services is the right place to get a definitive answer before work begins.

What the City's lists do and do not cover

The City publishes a list of projects that need a permit and a list that do not. Adding or removing walls needs a permit. New flooring does not. A change of room use with no structural or plumbing work appears on neither list. The Building Code Act makes the owner responsible for getting a permit when one is required, and the City's own FAQ says the owner and the builder are equally liable if a required permit is missing.

A few things can change the answer even when no walls move. If the project also involves plumbing work, such as adding a sink or moving a drain, that is a plumbing alteration, which is on the City's permit list. If the building is heritage-designated or sits in a Heritage District Overlay, the exemptions that apply to ordinary houses do not apply, and you would need to check with the City regardless.

For an accessibility project, the room-use question comes up when a living room or dining room becomes a main-floor bedroom. If that conversion involves adding or moving walls, a permit is required. If it involves only furniture, flooring or a closet that does not require structural work, the permit question is less clear, and that is the kind of question to put to Building Code Services with a short description of what you plan to do.

The single most useful first call here is to the City of Ottawa's Building Code Services, because they can tell you whether your specific change of use, with the exact scope of work you have in mind, triggers a permit before you commit to a contractor or a start date.