Quick answer. Two structures are possible when multiple unrelated tenants share a rental in Alberta. Under a joint tenancy (the standard approach for shared houses and apartments), all named tenants sign one lease, each is jointly and severally liable for the full rent and all obligations, and the tenancy is treated as one arrangement. If one tenant leaves, the remaining tenants owe the full rent unless a substitution is arranged with landlord consent. Under individual leases (typical only for room rentals in a licensed rooming house), each tenant signs their own lease for their room plus a share of common areas; each is liable only for their own portion, and one leaving does not affect the others. The joint structure is far more common in typical Calgary rentals and simpler to administer. Individual leases require careful compliance with municipal rooming-house licensing and provide less flexibility. Landlords should choose one structure and apply it consistently rather than blending elements.
Joint Tenancy (The Standard Structure)
In a joint tenancy, all tenants sign one lease as co-tenants. Legal features:
- Every tenant is jointly and severally liable for the full rent and all lease obligations. The landlord can collect the full rent from any one tenant regardless of internal roommate splits.
- Every tenant is liable for damage caused by any occupant of the unit, not just their own actions.
- One security deposit covers the whole unit and is held for the collective tenancy, not divided among tenants.
- All tenants must consent to any lease amendment. One tenant cannot unilaterally change the arrangement.
- Ending the tenancy typically requires all tenants to agree. One tenant giving notice does not end the tenancy for the others unless the landlord agrees.
When One Roommate Leaves: The Substitution Process
The most common Calgary roommate issue. Roommate A wants to leave a joint lease with 6 months remaining; Roommate B wants to stay and find a replacement. The RTA-compliant process:
- Roommate A requests a lease assignment or substitution in writing.
- Roommate B and the proposed replacement (Roommate C) both consent in writing.
- The landlord evaluates Roommate C using the same screening criteria applied to any new tenant.
- If Roommate C passes screening, the landlord consents in writing and executes an amended lease removing Roommate A and adding Roommate C.
- Roommate A's departure and Roommate C's arrival take effect on the same date.
- The security deposit remains with the landlord; internal financial settlement between A and C (whether C pays A a deposit equivalent) is a private matter between the roommates.
If the landlord unreasonably refuses to consent to a qualified replacement, the tenant substitution can be treated similarly to an assignment refusal (see the sublet and assignment guide). Reasonable refusal grounds include: proposed replacement fails screening; proposed replacement would breach lease terms.
What Happens If a Roommate Just Leaves Without Notice
If a roommate simply walks out without formal substitution, the remaining roommates are legally liable for the full rent. The departed roommate is also still legally on the lease and liable to the landlord if the rent is not paid. In practice, disputes among the roommates about internal contributions become civil matters between them, not the landlord's problem. The landlord's contract is with all named tenants regardless of who occupies the unit day-to-day.
Adding a New Roommate Mid-Lease
Similar process to substitution. The existing tenants request landlord consent, the landlord screens the proposed addition, and if consent is granted the lease is amended to add the new tenant. The added tenant becomes jointly liable from the amendment date forward. Landlords should insist on a formal amendment rather than accepting an informal 'they're just staying temporarily' arrangement, which creates ambiguity around liability and notice requirements.
Individual Leases (Rooming House Structure)
The alternative structure is a set of individual leases, one per tenant, for a specific room plus a defined share of common areas (kitchen, bathroom, living room). Features:
- Each tenant is liable only for their own rent and the specific obligations in their individual lease.
- One tenant leaving does not affect the others; the landlord may fill that specific room independently.
- Each tenant has their own security deposit.
- The landlord typically retains more control over common areas and can enforce shared-space rules more directly.
- Requires compliance with Calgary business licence bylaw as a rooming house (Business Licence Bylaw 32M98 category), which imposes additional inspection, safety, and licensing requirements.
Individual leases are typically used only for licensed rooming houses (5+ unrelated tenants in a single dwelling, each with their own room). For standard 2 or 3-tenant shared houses and apartments, joint tenancy is nearly universal and simpler.
Occupancy Limits and Unauthorised Occupants
Every lease should specify the maximum number of occupants. Landlords should insist on knowing all adults living in the unit and having them on the lease. Common problem: original tenants take on unofficial 'guests' or partners who effectively become long-term occupants without being on the lease. This creates two issues: the additional occupant has no lease relationship with the landlord (making eviction difficult if problems arise), and the original tenants may have breached the lease's occupancy clause. Best practice: address it by requiring the additional person to be added to the lease as a co-tenant with full screening and joint liability, or requiring them to leave.
Rent Splits: Landlord Involvement
How tenants split rent internally is not the landlord's concern in a joint tenancy. The landlord collects the full rent (typically from one designated point of contact), and internal splits are handled by the tenants themselves. Some property managers accept individual payments from each roommate as a convenience but continue to hold every tenant jointly liable for the full amount if one payment fails. Trying to allocate liability by 'who paid what portion' is inconsistent with the joint-and-several structure and undermines the landlord's collection position if a dispute arises.
Frequently Asked Questions
Can I evict one roommate without evicting the others?
Not typically under a joint tenancy. The tenancy is one arrangement; a breach that supports eviction supports it against all co-tenants. If one tenant is causing the breach (e.g., significant damage, threats), the practical response is to serve the appropriate notice on all named tenants, then work with the non-breaching roommates on a substitution if they want to continue. Individual eviction of one co-tenant while leaving the others in place is not the standard framework.
Do all roommates need to consent to a rent increase?
In a joint tenancy, the rent-increase notice must be served on all named tenants. All must agree to renew at the increased rent (or the tenancy typically ends and they collectively decide whether to move out). If some consent to renew and others do not, the arrangement effectively terminates.
Can a roommate be added without landlord consent?
No. Adding a new occupant without landlord consent breaches the lease. The landlord can require the added person to be formally on the lease with screening, or require their removal.
Who gets the security deposit back when the roommates move out?
The landlord returns the deposit to the roommates collectively (typically to one designated representative unless otherwise agreed). Internal splits among the roommates are private matters.
Does UrbanLease manage shared and roommate rentals?
Yes. UrbanLease structures shared rentals as joint tenancies by default, screens every co-tenant to the same criteria, and administers the standard substitution process when a roommate turnover occurs. Property management services provided by PREP Realty, a RECA-licensed Alberta brokerage.
Bottom Line
Joint tenancy is the standard structure for shared Calgary rentals. All roommates on one lease, joint and several liability, one deposit, formal substitution process for turnover. Individual leases are for licensed rooming houses only. Landlords who apply the joint framework consistently avoid the common problems (ambiguous liability, unofficial occupants, disputed rent splits) that create RTDRS complications. UrbanLease handles this framework under PREP Realty.