Roommate agreement Ontario guide: rent splits, house rules, deposits, and what the RTA doesn't cover

What a roommate agreement is (and what it isn't)

A roommate agreement is a private contract between the people sharing a home. It records the practical terms of living together: each person's share of the rent and bills, house rules, and the process for leaving. It is not a lease with a landlord, it is not a government form, and the Landlord and Tenant Board does not enforce it — but as a contract, it is legally binding between the people who sign it, and Ontario's Small Claims Court can enforce it.

Many roommate conflicts that end friendships — the guest who never leaves, the utility bill nobody pays, the sudden move-out — are really just missing paperwork. Writing the agreement takes an hour; arguing without one can take months.

The RTA gap: when Ontario tenancy law doesn't protect roommates

This is the single most misunderstood part of shared housing in Ontario. The RTA covers most rental housing, but roommate arrangements fall into two very different buckets:

1. Everyone is on the lease. All roommates signed the tenancy agreement with the landlord. The RTA governs the tenancy — rent rules, maintenance, eviction procedures — but only the relationship with the landlord. A fight between two co-tenants over the hydro bill or a departing roommate's share is not an RTA matter; it's decided by whatever the roommates agreed to (which is exactly why the roommate agreement exists).

2. You rent a room and share a kitchen or bathroom with the owner. Under section 5(i) of the RTA, the Act does not apply at all when the occupant shares bathroom or kitchen facilities with the owner (or the owner's spouse, child, or parent). There is no rent control, no standard-form lease requirement, no Board process — the arrangement is governed entirely by the contract you make and the common law. Most “renting a room in someone's house” situations in Ontario live here.

Know which bucket you're in before you sign anything. It determines your rights, your notice periods, and where you go if there's a dispute.

What to put in a roommate agreement

There is no mandatory form, so the agreement should be thorough on the points that actually cause fights. Cover at least the following:

• Full legal names of every roommate, the address, and the start date (and end date, if fixed)
• Each person's share of the rent, when it's due, and how it's paid
• Utilities, internet, and other shared bills: who's on the account, how costs are split, and what happens if someone pays late
• Guests and overnight guests: how many nights per week are fine, when advance notice is required, and any limits on long-term stays
• Cleaning: a schedule or rotation for shared spaces (kitchen, bathroom, common areas)
• Quiet hours and work-from-home expectations
• Food: shared staples vs. labelled personal items
• Smoking, cannabis, and alcohol rules for the unit
• Pets: allowed or not, and who is responsible for damage or complaints
• Parking, storage, and laundry arrangements
• Moving out: how much written notice each roommate gives, and the process for finding a replacement
• Signatures and the date — everyone signs the same document

Be specific. “Guests are fine sometimes” means nothing; “overnight guests up to 3 nights per week with 24 hours' notice” is enforceable. Vague agreements produce vague arguments.

Splitting rent and bills fairly

The two common approaches are an equal split and a proportional split. Equal splits are simple and work when bedrooms and amenities are roughly equivalent. Proportional splits make sense when one room is clearly larger, has an ensuite bathroom, or includes parking — agree on the dollar amounts up front rather than a formula nobody can reproduce later.

Utilities deserve their own clause: decide whose name goes on the hydro, gas, and internet accounts, how variable bills are divided (equal shares is the norm), and a deadline for reimbursing the account holder — 7 to 14 days is typical. Late reimbursement between roommates should carry a consequence you actually write down, such as the late payer covering any late fees charged by the utility.

One warning that surprises people: if all roommates signed the lease, the landlord can collect the entire rent from any one of you. This is called joint and several liability. Your roommate agreement divides the rent between you, but it doesn't divide your obligation to the landlord — if one person disappears, the rest must still pay the full amount on time, then recover the missing share from the departed roommate separately.

Security deposits: what Ontario law actually says

Ontario has the strictest deposit rules in Canada — and they create a trap for roommates who assume the same protections apply between themselves.

What landlords can take: only a rent deposit equal to the last rental period's rent (one month for a monthly tenancy), plus a refundable key deposit no higher than the direct cost of replacing the keys. Security deposits, damage deposits, cleaning deposits, and pet deposits are illegal when a landlord demands them from a tenant, even if the tenant “agreed.”

What roommates can take from each other: the RTA doesn't regulate this at all. A “damage deposit” paid to a fellow roommate isn't a deposit under the Act — it's just a private payment with none of the statutory protections (no interest rules, no Board remedy). That makes roommate deposits risky: if the holder won't return the money, your only route is a contract claim in Small Claims Court.

The practical advice: avoid roommate-to-roommate deposits entirely. If money must change hands — say, one roommate fronted the landlord's rent deposit — write down the exact amount, what it's for, the conditions for its return, and a return deadline. Treat it like a loan with paperwork, because legally, that's what it is.

Ending the arrangement: notice, early move-outs, and replacements

Every roommate agreement should answer three questions before anyone needs the answers: how much notice, who finds the replacement, and who pays in the meantime.

Notice: 30 days' written notice is the common standard for roommate arrangements outside the RTA. If all roommates are on a lease, the tenancy itself can only be ended through the RTA process — a tenant gives the landlord at least 60 days' written notice (Form N9) — and one co-tenant's notice doesn't end the tenancy for the others.

Early move-outs: the agreement should say whether a departing roommate keeps paying their share until a replacement moves in or until the notice period ends, whichever is later. Without that clause, the remaining roommates absorb the cost and must chase the departed roommate afterward.

Replacements: set the process in advance — who advertises, who interviews, and whether all remaining roommates must approve. If the new person will join the lease, the landlord's consent is needed, and landlords in Ontario generally can't unreasonably withhold consent to an assignment or a new occupant, though they can screen for the usual criteria.

When things go wrong: resolving roommate disputes

Start with the agreement: most disputes are really disagreements about what was promised, and a written clause ends them fast. Put complaints in writing (email or text creates a record), propose a specific fix, and set a deadline.

If direct discussion fails, options include:

• Mediation — a neutral third party helps you reach a deal; many Ontario community mediation services handle neighbour and roommate conflicts at low or no cost
• Community legal clinics — free legal information and advice for eligible Ontarians, useful before you spend money on a dispute
• Ontario Small Claims Court — for money claims up to $50,000 (limit raised October 1, 2025), including unpaid rent shares, bills, and property damage; filing fees are modest and lawyers aren't required

What won't help: the Landlord and Tenant Board. The Board decides disputes between landlords and tenants — not between roommates. Filing a Board application about a roommate conflict will be dismissed for lack of jurisdiction, so don't waste the filing fee.

Whatever route you take, documentation decides outcomes: keep the signed agreement, payment records, and written communications. Courts enforce contracts, not memories.

Roommates, sublets, and rooming houses — don't mix them up

These three get confused constantly, and the legal differences matter. A roommate agreement is a contract between co-occupants sharing a home. A sublease agreement is when a tenant rents their unit (or part of it) to someone else while remaining responsible to the landlord — Ontario tenants have a right to sublet with the landlord's consent, which can't be unreasonably withheld. A rooming house is a building where multiple people rent individual rooms, often with shared facilities — and unlike the spare-room-in-the-owner's-house scenario, rooming houses are generally covered by the RTA.

If you're subletting rather than sharing, see our sublease resources and the Ontario lease guide linked below — the paperwork and the rights are different.