Shared housing is everywhere in Montreal, Laval and Longueuil: students, young professionals, blended families. Yet most landlords sign a roommate lease exactly like an ordinary one, assuming that 'if one doesn't pay, the others will.' In Quebec, that assumption is wrong by default.
This article explains how the Civil Code actually treats several tenants in one unit: why solidary liability must be stipulated, how to choose between a single lease and a lease per room, what happens when a roommate leaves, and why every replacement must go through the same tenant screening as the original signatory.
Shared tenancy is not a separate legal regime
There is no such thing as a 'roommate lease' in Quebec. The Civil Code knows only tenants: when several people sign the same lease, they are all tenants of the same dwelling, with the same rights and the same obligations toward the landlord. The word 'roommate' describes a factual situation, not a special status.
That absence of a separate regime has a direct consequence: nothing in the law automatically settles the questions landlords ask — who owes the full rent, who may leave, who stays bound. The lease clauses decide, and where there is no clause, the general rules of obligations apply.
Article 1525: solidary liability is not presumed
This is the most misunderstood point in shared tenancy. Article 1525 of the Civil Code of Quebec provides that solidarity between debtors is not presumed: it exists only where expressly stipulated, or where the law provides for it. A residential lease signed by individuals is not among the cases where the law presumes it.
Without a solidarity clause, each roommate owes only their share. Concretely: three roommates, $2,100 in rent, none is liable for more than $700. If one stops paying, the landlord cannot claim the missing $700 from the other two — they must pursue the defaulting tenant, with all the delay and collection effort that implies.
One lease or a lease per room?
Both structures are legal. They allocate risk in opposite directions, and the choice must be made before listing, because it changes how you advertise, screen and price the unit.
| Single lease + solidarity | One lease per room | |
|---|---|---|
| Who owes the full rent | Each tenant, for the whole amount | Each tenant, for their room only |
| Vacancy risk | Carried by the roommates | Carried by the landlord, room by room |
| One occupant leaves | The others remain liable for full rent | No effect on the other leases |
| Choosing a replacement | Proposed by the roommates, approved by you | Entirely your decision |
| Management load | One file, one inspection report | As many files, inspections and notices as rooms |
| Common areas | Leased with the dwelling | Must be defined explicitly in each lease |
For a family-sized unit rented to an established group (a couple, friends, siblings), a single lease with solidarity is almost always the right call: one file to manage and rent guaranteed in full. A lease per room can be defended for a large unit rented to occupants who don't know each other — but it turns the landlord into a room manager, with the vacancy and turnover that come with it.
What the solidarity clause must contain
The clause is added to the schedules of the mandatory lease. It must be explicit: as with suretyship, whatever is not stipulated is not owed.
- An express statement that the tenants are solidarily liable for the lease obligations
- The scope of that liability: rent, damage to the dwelling, costs — not rent alone
- That it applies for the entire lease term and each of its renewals
- A prohibition on subletting or assigning a share without your prior written consent
- The rule for replacing an occupant: written approval, screening of the candidate, amendment signed by all
When a roommate leaves mid-lease
This is the situation that generates the most calls. The starting principle often surprises tenants: a roommate cannot unilaterally terminate 'their share' of the lease. As long as they are a signatory they remain bound — and if the lease carries a solidarity clause, they remain bound for the full rent, even after moving out.
Three routes exist to regularize a departure, and they do not have the same effects:
- 1Assignment of the leaving tenant's interest to a replacement: it releases the assignor going forward. It requires notice to the landlord, who may refuse only for serious cause.
- 2Sublease: it does not release the departing roommate, who remains liable to you. Useful for a temporary absence, not for a permanent departure.
- 3A three-party amendment: you consent in writing to remove the leaver and add the replacement to the lease. It is the cleanest route, and the only one that leaves you in control of the replacement's file.
A common trap: accepting a roommate's departure verbally. Without a writing, the release cannot be demonstrated — yet your conduct may be read as tacit consent. Always formalize with a signed amendment stating whether the leaver is released or remains bound.
Screen the replacement like any other candidate
When roommates propose a replacement, the temptation is to accept on their recommendation — they will be living with the person, after all. That is a management error: the replacement becomes your tenant, not their guest. They must go through the same steps as everyone else.
- Identity verification and income confirmation
- Rental history and references from the previous landlord
- Ability-to-pay assessed against the full rent where the lease is solidary
- An amendment signed by all roommates, including the one leaving
Three particular situations to know about
Shared tenancy intersects with a few rules landlords often discover too late.
- Non-signatory occupant: a person living in the unit without being on the lease is not your tenant — you have no direct recourse against them, and the signatory answers for their conduct. Have every adult occupant sign.
- The tenant's spouse: a spouse living in the dwelling may, under conditions set out in the Civil Code, become the tenant by continuing to occupy the premises after the signatory leaves or dies. A unit rented to one person can therefore end up occupied by another.
- Domestic or sexual violence: the Civil Code allows a tenant to terminate their lease on two months' notice in these situations. Solidarity does not stand in the way of that right.
Common landlord mistakes
- Assuming solidarity is automatic because several names appear on the lease
- Screening only one roommate — the most 'reassuring' one — and signing with the others on no file at all
- Assessing ability to pay on each share when the lease is solidary
- Accepting a roommate's departure verbally, with no written amendment
- Letting the roommates pick their replacement on their own
- Mixing a single lease and per-room leases in the same unit