You can check whether a suite is legal by searching your municipality’s suite registry or permit records, then confirming four physical items: a permitted separate entrance, compliant egress windows, the required ceiling height, and fire separation with interconnected alarms. Calgary maintains a publicly searchable registry, so in that city anyone — including a prospective buyer — can look up any address.
- Start with the records, not the walkthrough — a permit search is definitive
- The four physical checks: entrance, egress windows, ceiling height, fire separation and alarms
- Egress standard across AB, BC and ON: 0.35 m² openable, no dimension under 380 mm
- Legal non-conforming is a real protected status — not a polite word for illegal
- If it isn’t legal, the reliable damage is insurance, lending and resale — not enforcement officers
This is an anxious question, and it deserves a calm answer. A great many Canadian basement suites were built without permits — this is a widespread, well-known situation rather than an unusual one, and there’s an established path through it.
The good news is that it’s genuinely checkable. You don’t need to guess, and you don’t need to rely on what a previous owner told you. This guide gives you the sequence.
Check the records first
Start here, because it’s definitive and it takes minutes.
Calgary — a public registry. The City maintains an online, searchable secondary suite registry listing legal, inspected suites that meet Alberta’s safety code requirements. Registered suites also receive a numbered sticker posted at the main entrance. Search your address; if it’s listed, you have your answer. Notably, this cuts both ways — a buyer, a tenant or an insurer can search it too.
Edmonton — permit and open-data records. Edmonton publishes permit information and open data that is queryable by address. A search will tell you what permits exist against the property.
Toronto and the GTA — permit records. A building permit is required for interior alterations creating a second dwelling unit, so a permit search against your address will show whether one was obtained. Municipal processes across the GTA differ; some maintain registration systems on top of permits.
If self-service doesn’t settle it, call. One call to your municipality’s building department with your address will usually tell you what’s on record. This is faster than reading and more reliable than inference.
One thing to be aware of: the absence of a permit record isn’t always conclusive for very old work, and records can be incomplete. If the search comes back empty but you believe the suite was permitted decades ago, ask the municipality directly rather than assuming either way.
The four-item physical check
You can do these yourself with a tape measure in under an hour. They’re the items an inspector looks at first.
1. The entrance. Can the occupant get in and out without passing through the main dwelling? Note that a shared stairwell can be acceptable — Calgary permits it, provided each unit has its own private entrance off the landing. You don’t necessarily need a separate exterior door.
2. Egress windows. Every bedroom needs one. The standard across Alberta, B.C. and Ontario is an unobstructed openable area of at least 0.35 m² with no dimension less than 380 mm, openable from inside without keys, tools or special knowledge. Measure the actual opening, not the frame — this is where people get it wrong. Sill height limits also apply and differ by province.
3. Ceiling height. Measure at the lowest point of the main living area, and separately under beams and ducts:
- Alberta: minimum 1.95 m, reducible to 1.85 m below ductwork and beams
- British Columbia: minimum 2 m
- Ontario: minimum 1.95 m in basements, with beams and bulkheads permitted to 1.85 m
4. Fire separation and alarms. Is there a rated separation between the units and around the furnace room? Are the doors solid-core with self-closers where required — Alberta specifies at least 45 mm thick? Are the smoke alarms hardwired and interconnected across both units, so one sounding sounds them all? Carbon monoxide alarms present?
Read the results this way: ceiling height is the one that’s expensive to fix. Everything else on this list ranges from straightforward to moderate. If your height passes, you’re probably in a workable position regardless of what else fails.
What “legal non-conforming” means
This term causes real confusion and it’s worth getting right, because it’s genuinely good news when it applies.
Legal non-conforming means the suite was lawful when it was built, but the rules have since changed and it no longer complies with current requirements. It is permitted to continue under grandfathering provisions. It is legal — not a softer way of saying illegal.
The qualifications that matter:
- Substantial alteration can end the protection. Renovating extensively may require bringing the unit to current code.
- Discontinued use can end it in many municipalities — if the suite sits unused for a defined period, the protection may lapse.
- It doesn’t override life safety. A municipality can generally still require alarms and basic fire safety measures.
- The rules are municipality-specific. Confirm the terms that apply to you rather than assuming permanent immunity.
If your suite turns out to be legal non-conforming, you have an asset with a caveat rather than a problem — but understand the caveat before you renovate.
What it means if it isn’t legal
Honestly, and without alarm.
Enforcement is typically complaint-driven. Municipalities don’t patrol for unpermitted suites. Action usually follows a complaint — often from a neighbour, sometimes arising from an unrelated inspection. It’s real, but it’s not the main risk and anyone leading with it is misjudging the picture.
The reliable damage is financial:
Insurance. An undisclosed rental unit can compromise a claim. If something goes wrong in a suite your insurer didn’t know about, your position is considerably worse than the cost of having permitted it. This is the largest exposure and the one most people underestimate.
Lending. Lenders generally won’t count rental income from an unpermitted unit toward qualifying you. If you’re refinancing — to fund anything — an unregistered suite may be actively reducing your borrowing capacity.
Resale. A buyer’s lawyer will find it. It becomes a price negotiation, a condition of sale, or occasionally a requirement to remove the unit. You pay either way, later and on their terms.
Programme eligibility. Every suite incentive in Canada pays against legal, registered units.
What it does not mean: that you have to stop renting immediately, or that you’re facing a crisis. It means you have a known problem with a known path to resolution, and it’s worth costing that path.
How to legalise it
The sequence is broadly the same everywhere: establish what’s non-compliant, apply for a building permit for the remedial work, complete it, pass inspections, and register where your municipality requires registration.
Two encouraging data points from Calgary, where the numbers are published: legalising an existing suite carries a building permit fee of $205.92, with the City giving an approval timeline of approximately seven days for that review — and registration itself is free.
The cost that varies is the work, and as noted above it ranges from a weekend of alarms and a self-closing door to structural underpinning. Get that assessed before deciding, because the two ends of that range lead to genuinely different decisions.
For Ontario specifically, our guide on legalising a basement apartment covers the Ontario Building Code requirements and the municipal process step by step.
Should you buy a house with an unregistered suite?
Frequently yes — with the price reflecting it.
The questions to ask before you commit:
- Does it pass the ceiling height check? If not, legalisation may require underpinning, and that should come off the price substantially.
- What does the municipality’s record show? In Calgary you can search the registry yourself before making an offer. Elsewhere, ask.
- Is the seller representing it as legal? If so, that representation should be tested and reflected in the agreement, not accepted verbally.
- What is the rental income actually worth to you? If your lender won’t count it, the income doesn’t help you qualify — which may change what you can afford to pay.
- What would legalisation cost? Get this assessed as a condition rather than assuming.
An unregistered suite is a negotiating position, not automatically a reason to walk away. What makes it a bad purchase is paying a legal-suite price for an illegal one. Our FAQ covers common questions on this.
Find out what legalising yours would take
The useful output isn’t “legal or not” — it’s what compliance would actually require and cost. That ranges from trivial to structural, and it’s knowable in an afternoon.
HouseLyft’s free property assessment establishes where your suite stands and what bringing it into compliance would involve. Request your free report.
This guide explains how to check a suite’s status in general terms and is not legal advice. Registry systems, records and non-conforming provisions differ by municipality — confirm your own situation directly with your municipality, and your coverage position with your insurer.
Checked by Lee Yousaf, Founder