How Do I Set Up a Roommate Agreement?

First, Figure Out Who Is Actually a Tenant

The rights you have as a roommate depend heavily on how the lease is structured. When everyone signs the same lease, you are co-tenants — and in most jurisdictions that means joint and several liability: the landlord can pursue any one of you for the entire rent and for damage, no matter who caused the shortfall. When only one person signs, the others are often 'occupants' or subtenants in the landlord's eyes, which usually means limited access to tenancy-tribunal protections and a weaker position if the primary leaseholder wants them out.

This distinction matters because tenancy statutes generally govern the landlord-tenant relationship, not the relationship between roommates. Ontario's LTB, BC's Residential Tenancy Branch, and most US housing tribunals rarely resolve roommate-versus-roommate disputes over unpaid shares or who keeps the deposit. That gap is exactly what a written roommate agreement fills — it is the enforceable understanding among the people living together, separate from the lease with the landlord.

What a Good Roommate Agreement Covers

The disputes that break up households are predictable: money, notice, guests, and chores. A solid roommate agreement addresses each in writing. On money: the total rent, each person's share, the due date, and how each pays — plus who covers a shortfall if someone stops paying, which matters because co-tenants remain liable to the landlord regardless of the internal split. On deposits: who contributed what, and how each share is returned, since landlords typically deal only with the leaseholder and other roommates can be left chasing that person later.

Just as important is the exit. Define how much notice a departing roommate must give, whether they must help find a replacement, and how their rent and deposit share are settled on the way out. This is the single most common flashpoint. Round out the agreement with house rules — guests, overnight visitors, pets, quiet hours, shared-space cleaning, and responsibility for damage — so expectations are explicit rather than assumed. Everyone should sign, and everyone should keep a copy along with proof of their contributions.

Enforcing It When Things Go Wrong

A roommate agreement cannot change your obligations to the landlord — if you are a co-tenant, you remain fully liable for the rent even if the agreement says otherwise. What it does is govern how roommates settle up among themselves, and it gives you a document to point to when a dispute arises. Keep contemporaneous records too: proof of each person's deposit and rent contributions, shared-bill splits, and any messages agreeing terms fill the gaps if the written agreement is silent.

Because tribunals seldom hear roommate-versus-roommate cases, the realistic forum for a serious money dispute — an unpaid share, an unreturned deposit contribution — is often small claims court, where a signed agreement and payment records make a straightforward claim. For safety issues involving a roommate, ordinary options like the police, personal-safety orders, or (if the person is an occupant of your unit) removal processes may apply. When your own tenancy or liability is at stake, a tenant legal clinic can advise on your specific status.

Related: Landlord & Tenant Wizards · All Landlord & Tenant Wizards · Resolve a Roommate Dispute · Lease Agreement Review Guide · Security Deposit Claim Builder · All Legal Wizards