Renting Out Your Basement Suite: What Your Home Policy Stops Covering

A basement suite doesn't feel like a rental property. You still live upstairs, it's still your house, and the tenant downstairs is helping with the mortgage, not running a business. That's exactly why it's the rental situation people most often fail to mention to their insurer — and the gap it creates is real.

Does my home insurance still cover me if I rent out my basement suite?#

Only if your insurer knows about it. Renting out a basement suite is a material change in how the home is used and occupied, and most Canadian home insurers expect you to disclose it. Tell them, and most will cover a legal or even an unregistered suite readily, often for a modest additional premium. Don't tell them, and you're not carrying a smaller version of the coverage — you may be carrying none for anything connected to the suite.

Why does a tenant downstairs change anything?#

Because your policy was priced for a single household, and a paying tenant changes the actual risk in ways insurers specifically underwrite for: another family's cooking, space heaters, candles, and guests; a landlord-tenant relationship on the stairs and common areas; and — the part this site focuses on — a person you now owe a liability duty to as an occupier, exactly as described in Occupiers' Liability. None of that is a problem if your insurer knows. All of it is a problem if they don't.

What actually goes wrong if the suite is undisclosed?#

Two things, and the second one surprises people more than the first:

1. The tenant's own injury claim is in jeopardy. If a tenant is hurt on the stairs or in the suite itself, an insurer can take the position that the claim arose from a use of the property it never agreed to insure.
2. Claims unrelated to the tenant can be affected too. A kitchen fire, a burst pipe, a theft — an undisclosed material change can put the broader policy in question, not just the liability section connected to the suite.

That second point is the one accidental landlords rarely see coming. The mistake isn't buying bad insurance. It's having good insurance for a home that no longer matches what the policy describes.

Does it matter whether the suite is legal?#

It's a related question, not the same one. Municipal zoning and building code compliance determine whether the suite is legal to rent under local bylaws. Whether it's insurable is a separate conversation with your insurer. Many Canadian insurers will still cover a disclosed suite that isn't formally registered with the city — sometimes with conditions attached, like confirming fire separation between floors, working smoke and carbon monoxide detectors, and a second means of egress. Some insurers decline unregistered suites outright. The only way to know which kind of insurer you have is to ask directly, rather than assuming either the best or the worst.

What does disclosure actually involve?#

A single conversation, typically covering:

Most insurers will either add an endorsement to your existing policy or move you to a landlord policy that specifically contemplates an owner-occupied property with a rented suite, usually for a modest additional premium rather than a dramatic one.

Registered, unregistered, or undisclosed — does the label matter?#

For insurance purposes, the meaningful line isn't "legal vs illegal." It's "disclosed vs undisclosed." Here's how the three situations generally differ:

The middle row is the one people most consistently get wrong. "It's not legally registered, so there's no point mentioning it" is exactly backwards — an unregistered suite is often still insurable once disclosed. It's silence, not the suite's legal status, that creates the gap.

Does my mortgage lender care about any of this?#

Possibly, separately from your insurer. Some mortgage agreements and lender requirements touch on how a property may be used or rented, and a secondary suite can be relevant to that conversation too. That's a distinct question from insurance disclosure, and this page isn't the place to answer it — if your mortgage terms are a concern, that's worth a direct conversation with your lender alongside the insurance one, not an assumption in either direction.

What if I've been renting it out for years without telling anyone?#

Call your broker now, not after an incident. Disclosing late is a better outcome than a claim being denied for an undisclosed material change discovered during the claims investigation — which is exactly when insurers look hardest at how a property is actually being used. There is no version of this conversation that goes worse for you than the version that happens after a tenant's injury.

How is this different from renting out a full property?#

This page is specifically about the accidental-landlord version: you live upstairs, a tenant lives downstairs, and it's still fundamentally your home. If you've moved out entirely and rent the whole property to tenants — a kept condo, an inherited house, a dedicated rental — that's a different insurance product with its own rules, covered in Does Umbrella Insurance Cover a Rental Property? The core lesson is identical either way: the wrong policy on a rented property, or an undisclosed use, is the actual danger — not the rental itself.

Does an umbrella policy change any of this?#

Only for the better, and only once the base layer is right. A personal umbrella can extend excess liability protection over a properly declared basement suite the same way it extends over the rest of your home, once your insurer knows the suite exists and the underlying policy correctly reflects it. It follows the base policy exactly as Does Umbrella Insurance Cover a Rental Property? describes: right underneath, it works. Wrong or silent underneath, it inherits the same gap.

What should you actually do before the next tenant moves in?#

1. Call your broker before signing a lease, not after — disclosure is a ten-minute conversation, not a renovation.
2. Ask specifically about registration status. Don't assume "illegal basement" automatically means "uninsurable" — many insurers will still cover it, disclosed and conditioned.
3. Confirm smoke and CO detection in the suite, since it's a common condition insurers attach regardless of registration status.
4. Re-disclose if anything changes — a new tenant, an added bedroom, a second unit. The conversation isn't a one-time event.

The bottom line#

A basement suite doesn't stop being your home just because someone pays rent for part of it, and your insurance shouldn't have to guess which situation you're actually in. The dangerous belief — "coverage is void anyway, so why bother disclosing" — pushes people toward going uninsured entirely, which is strictly worse than a disclosed suite with a few conditions attached. Tell your insurer what's actually happening in the house. It's the cheapest fix on this entire site.