Your legal basement suite still can't be an Airbnb

I get some version of this question every few weeks: I'm building a legal basement suite, can I put it on Airbnb instead of finding a long-term tenant? I've written about the conversion math and about what's actually legal for short-term rentals in Ottawa, but I never lined the two up against each other for the specific case of a suite you don't personally live in. I did that this week, going back to the by-law's actual text instead of the summaries that circulate online. The answer is no. Not as a matter of policy preference. The by-law's own definitions rule it out, and the reasoning is worth walking through because it shapes how you should finance and rent the suite instead.

What "residential unit" actually means

Ottawa's Short-Term Rental By-law (2021-104) defines a residential unit as a self-contained set of rooms with sleeping, kitchen and bathroom facilities for the exclusive use of the people living in it. A code-compliant basement suite, the kind built to the standard in my June post, meets that definition on its own merits. It isn't part of the unit upstairs just because they share a foundation and a mortgage. Under this by-law, a legal basement suite is a second, separate residential unit sitting inside the same building as the first.

That distinction is the whole ballgame, because the by-law doesn't regulate short-term rentals by building. It regulates them by residential unit, one at a time.

What "principal residence" actually means

The by-law defines principal residence as the residential unit where you're ordinarily resident, where you pay your bills and hold your ID, and where you have no other unit designated as such anywhere else. A host permit is only issued for the applicant's principal residence, meaning the specific unit they live in, not the building they happen to own.

If you live upstairs, your principal residence is the upstairs unit. The basement suite is a different residential unit under the by-law's own definition, one you don't live in, so no permit can issue for it. It doesn't matter that you own both units and carry one mortgage across the whole property. The by-law never asks who owns the building. It asks who lives in the unit being rented.

The workaround that doesn't hold up

A fair amount of investment content circulating online suggests structuring a purchase as owner-occupied with a legal secondary suite to stay onside of rules like these. Having gone through the definitions above line by line, I don't think that advice survives contact with the actual text in Ottawa's case. The only way to legally short-term rent a basement suite here is to live in the basement suite yourself and rent the upstairs unit long-term instead. That flips the economics in my June post upside down, since the upstairs unit is almost always the higher-rent half of the building, and it's rarely what the person asking the question actually wants to do.

One thing that's changed since May

My short-term rental post in May quoted the host permit fee at $110. The city's current fee schedule lists it as a $65 administration fee plus a $58 permit fee, $123 total, still valid for two years. Small increase, but worth the correction on the record. Everything else in that post, the principal residence rule, the $1 million liability minimum, the rural cottage exception, still checks out against the current by-law text.

If you financed the suite federally, you're locked out twice over

There was a federal loan program announced for exactly this use case: up to $40,000 at a fixed 2% for 15 years, later doubled to $80,000 in the 2024 budget. It was cancelled in the 2025 budget without ever opening. CMHC never took a single application under it. If you've been waiting on that money to show up before you build, stop waiting.

The program that actually exists is a CMHC-insured refinance, live since January 2025, letting you refinance up to 90% of the value of a property carrying up to four units, capped at a $2 million property value. Read the fine print and there's a second short-term rental ban baked into the financing itself, separate from the city's. The suite cannot be rented for stays under 90 consecutive days as a condition of the insured loan. Build your suite with this financing and you've stacked a 90-day floor on top of the city's 30-day floor. Airbnb was never on the table twice over, once at the municipal level and once again in the mortgage document.

What actually threads both restrictions

Long-term tenancy still produces the best numbers for most owners, and the cap rate math in my June post holds up on its own. But if you want more than long-term rent without touching either restriction, furnished mid-term rental, the 60 to 180 day corporate and relocation housing that insurers and employers place tenants into, clears both bars at once. It isn't marketed as a stay under 30 nights, so the city's by-law doesn't apply to it. It isn't under 90 days either, so it satisfies the insured refinance condition too if that's how you financed the build. It's the one rental model actually built for a suite that's financed and licensed exactly the way the rules require it to be, and it typically rents at a real premium over a standard 12-month lease.

Thinking about adding a suite, or already have one and want to know what it actually supports for financing or rental structure? Call 613-262-6545 or email fil@613realtor.ca and we'll work through your specific property before you commit to a contractor or a lender.