You get a call from a neighbour, or you stop by for an inspection, and you realize there is someone living in your rental unit who you have never met and who never signed anything. Maybe your tenant moved in a partner six months ago and never mentioned it. Maybe the tenant themselves has quietly moved out and left a friend behind. Whatever the situation, your first instinct might be to serve a notice and start the eviction clock. That instinct, while understandable, is usually the wrong move, and acting on it too quickly can cost you months of wasted time at the Landlord and Tenant Board.
At Blue Anchor, we manage long-term residential rental properties across Belleville, Trenton, Quinte West, Cobourg, Port Hope, and the surrounding areas, and this situation comes up more often than most landlords expect. The reason it trips people up is that Ontario law draws a distinction most landlords have never had properly explained: the person living in your unit is either a tenant, an occupant, or a guest, and your options are completely different depending on which one they are.
This post walks through that distinction, explains what you can and cannot do under the Residential Tenancies Act, and gives you a practical framework for handling the situation without accidentally making it worse.
Tenant, Occupant, or Guest: Why the Label Matters
Under the Residential Tenancies Act (RTA), a tenant is someone who has entered into a tenancy agreement with the landlord. That agreement does not have to be written. If you accepted rent from someone and let them move in, a tenancy likely exists even without a signed lease. An occupant, by contrast, lives in the unit but has no agreement with the landlord and therefore no direct legal relationship with them. That also means an occupant has no security of tenure of their own. A guest is temporary, someone staying for a visit rather than living there.
Here is the part that surprises most landlords: the RTA does not set a specific number of days after which a guest automatically becomes an occupant or a tenant. This is one of the most persistent myths in Ontario landlord circles. You may have seen lease clauses that say something like guests cannot stay more than seven or fourteen consecutive nights. Those clauses are likely unenforceable to the extent they conflict with a tenant's right to reasonable enjoyment of the unit. A tenant has the right to have people in their home. The question of when a guest becomes a long-term occupant is a factual one that depends on the whole picture, not a simple day count.
What You Can and Cannot Do About an Occupant
The most important thing to understand about an unauthorized occupant is this: you cannot evict them directly. There is no tenancy between you and the occupant, which means there is no tenancy to terminate. Any application to the Landlord and Tenant Board must be made against the tenant, not the occupant.
If your tenant is still in the picture, the path forward depends on what the tenant has actually done wrong. If they have violated a lease term or the RTA in some other way, you may have grounds for an application, but you need to be precise about what the violation is and serve the right notice against the right person. Serving the wrong notice wastes months. In our experience at Blue Anchor, the safe first step when you discover someone unexpected in the unit is almost always documentation and a written request for information, not an immediate notice. Find out who this person is, when they moved in, and what the tenant says about the situation. Get it in writing. That information shapes everything that comes next.
The scenario that creates the most legal complexity is when the original tenant has moved out and left an occupant behind. That occupant is now unauthorized, but your options and timelines depend on when the tenant vacated and, critically, whether you have done anything that could be read as accepting the occupant as a new tenant. The most common way landlords accidentally create an unintended tenancy is by accepting rent directly from the occupant. Once you do that, even once, it becomes very difficult to argue there is no tenancy. If someone other than your named tenant hands you money and you take it, you may have just created a legal relationship you did not intend.
When a Tenant Wants to Add Someone to the Lease
The cleanest version of this situation is when a tenant proactively tells you they want to move in a partner or roommate and asks to add them to the lease. This is exactly the kind of conversation landlords should encourage, and in our experience, formalizing the arrangement is almost always better for the landlord than leaving it ambiguous.
Adding someone to the lease as a co-tenant means they become jointly and severally liable for the rent. If your original tenant eventually moves out, you still have a signed tenant in place. If there is ever a dispute about damage or unpaid rent, you have more people on the hook. The short-term inconvenience of paperwork is worth the long-term protection. When a landlord leaves a live-in partner or roommate in an informal, undocumented status, they are accepting all the downside risk of a tenancy with none of the legal clarity.
The process for adding someone is straightforward: both parties agree, you prepare an amendment or a new lease, and everyone signs. Screen the new person the same way you would screen any applicant. There is no legal requirement that you accept anyone a tenant proposes, but you should have a legitimate, documented reason if you decline. Our post on how Blue Anchor screens tenants walks through the criteria and documentation that make a defensible screening decision.
Assignments, Sublets, and Section 95
A different situation arises when a tenant wants to transfer their tenancy entirely, either by assigning it to someone else or by subletting while they are temporarily away. These are legally distinct, and landlords often confuse them.
A sublet is when the original tenant temporarily vacates and has someone else occupy the unit, with the intention of returning. The original tenant remains responsible to the landlord. An assignment is a full transfer of the tenancy to a new person. The original tenant steps out of the relationship entirely and the assignee steps in.
Under section 95 of the RTA, a tenant may request that the landlord consent to an assignment of the unit to a specific person. The landlord cannot arbitrarily or unreasonably withhold consent to a specific proposed assignee. If the landlord refuses consent without a legitimate reason, the tenant may have the right to terminate the tenancy early. This is a provision that catches landlords off guard. You do have the right to say no to an assignment in general, meaning you can tell the tenant you would prefer not to assign the unit at all, but if you agree to consider an assignment and then reject a specific person without good reason, you are on shaky ground under the RTA.
The practical takeaway is that when a tenant raises the idea of an assignment, you should think carefully before responding. If you have a legitimate concern about the proposed assignee, document it. If you would simply prefer to find your own new tenant and start fresh, understand what the RTA allows you to do in that situation and get advice before you respond in writing.
What to Do the Moment You Discover an Unexpected Occupant
Whether you find out through an inspection, a neighbour complaint, or a tip from a contractor, the steps you take in the first few days matter. Here is the framework we use at Blue Anchor when a property we manage surfaces this kind of situation.
First, document everything. Note the date you became aware, how you found out, and any physical evidence you observed. Do not confront anyone on the spot in a way that could be characterized as harassment.
Second, send a written communication to the tenant on record asking them to clarify who is living in the unit. Keep the tone professional and factual. You are gathering information, not making accusations. The response, or the absence of one, tells you a lot about how to proceed.
Third, do not accept rent from anyone other than the named tenant until you have legal clarity on the situation. If the named tenant has vacated and an occupant is trying to pay rent, talk to a paralegal or lawyer before you touch that money.
Fourth, if the situation involves a tenant who has clearly abandoned the unit, understand that there is a specific process under the RTA for dealing with abandonment. Skipping that process and simply changing the locks exposes you to serious liability.
Finally, if the occupant has been there long enough and the facts are ambiguous enough that a tenancy may have been created, get professional advice before serving any notice. Serving an N4 or any other notice against someone who turns out to be a legal tenant, or serving it against someone who has no tenancy and therefore cannot be served under that process, wastes months and may prejudice your position. If you are unfamiliar with how the N4 process works under recent legislative changes, the post on Ontario Bill 60 and the N4 notice period is worth reading before you act.
Frequently Asked Questions
Can I evict someone who is living in my unit but never signed the lease?
Not directly. You cannot file an application at the Landlord and Tenant Board against someone with whom you have no tenancy. Your application must be against the tenant. If the original tenant has vacated and left an occupant behind, the process for removing the occupant depends on whether a tenancy has been created with them, intentionally or accidentally.
Does a guest become a tenant after a certain number of days in Ontario?
No. The RTA does not set a day threshold. This is a persistent myth. The question of whether someone is a guest, an occupant, or a tenant depends on the facts of the situation, not a fixed timeline. Lease clauses that try to cap guest stays at a specific number of nights are likely unenforceable to the extent they conflict with the tenant's right to reasonable enjoyment.
What happens if I accept rent from someone who was never on the lease?
You risk creating an unintended tenancy. Accepting rent from an occupant is one of the most common ways landlords accidentally establish a legal relationship they did not intend, and it is very difficult to undo. If someone other than your named tenant is offering to pay rent, do not accept it until you have clarity on the legal situation.
Can a tenant add someone to the lease without my permission?
A tenant cannot unilaterally add a co-tenant without the landlord's agreement. However, a tenant does have the right to have occupants in their unit, and you cannot unreasonably restrict who lives with them. The formal process of adding someone to the lease as a co-tenant requires both parties to agree and sign updated documentation.
What is the difference between an assignment and a sublet?
A sublet is temporary. The original tenant plans to return and remains responsible to the landlord throughout. An assignment is a full transfer of the tenancy. The original tenant exits the relationship and the new person takes their place. Under section 95 of the RTA, a landlord cannot arbitrarily or unreasonably withhold consent to a specific proposed assignee once the tenant has requested an assignment.
The Bottom Line for Ontario Landlords
Unauthorized occupancy situations are common, and they are almost always manageable if you respond carefully and methodically. The landlords who get into trouble are the ones who act on instinct, serve the wrong notice against the wrong person, or accidentally create a tenancy by accepting rent from someone they should not have. The landlords who come out of these situations cleanly are the ones who document first, ask questions second, and serve notices only when they know exactly what they are doing and why.
At Blue Anchor, handling situations like this is part of what we do every day for landlords across Belleville, Trenton, Cobourg, and the surrounding communities. If you are managing your rental on your own and you have discovered someone unexpected in your unit, the most valuable thing you can do right now is slow down and get informed before you act. If you would like to talk about what professional property management looks like for your rental, we would be glad to walk you through how Blue Anchor approaches these situations and what our management program includes. Reach out to our team and we can start the conversation.
