In Oregon, a guest becomes a tenant the moment the arrangement starts looking like a rental in substance, regardless of what the parties call it. There is no magic number of nights. Under ORS 90.100, a tenant is anyone entitled under a rental agreement, written or oral, to occupy a dwelling unit to the exclusion of others, and that agreement can arise from a conversation or even from a pattern of conduct.1Oregon Public Law. Oregon Code 90.100 – Definitions By the time most property owners notice the shift, the full Residential Landlord and Tenant Act already governs the relationship.
The Statutory Line Between Guest and Tenant
ORS 90.100 does two things that matter here. It defines a tenant as someone entitled under a rental agreement to occupy a dwelling to the exclusion of others, and it defines “rental agreement” to include all agreements, written or oral, along with valid rules about use and occupancy.1Oregon Public Law. Oregon Code 90.100 – Definitions The same statute says a guest or temporary occupant is not a tenant, but it does not define “guest” with any precision.
That gap is what the factor analysis below fills. Oregon courts decide tenant status by looking at the facts, not the label the parties use. Someone can be called a houseguest for months and still be a tenant in the eyes of the law.
Factors That Push a Guest Into Tenant Status
No single factor decides the question. Each one adds weight, and the more that stack up at once, the harder it becomes to argue the person is just visiting.
Regular financial contributions. This is the strongest signal. Rent does not have to look like a check made out to a landlord. Predictable monthly contributions toward the mortgage, utilities, groceries, or household expenses can function as rent if they are expected rather than occasional. A $500 Venmo on the first of every month reads very differently from an offer to pick up a pizza.
Length of the stay. A weekend is a visit. A stay that passes a month starts to look like occupancy. The longer and more uninterrupted the stay, the harder the guest label becomes to defend.
Exclusive use of space. A guest on the couch shares common space temporarily. Someone with their own bedroom, a key, a lock they control, and belongings stored permanently is occupying space to the exclusion of others, which is the exact phrase ORS 90.100 uses to describe a tenant.1Oregon Public Law. Oregon Code 90.100 – Definitions
Using the address as home. Receiving mail there, registering to vote there, listing it on a driver’s license, or sending bank statements to it all point toward the property being a primary residence.
No other place to go. If the person has given up a prior home, moved their belongings in, and has nowhere else to return to, courts lean strongly toward finding a tenancy.
The intent shown by behavior. Did the owner set rules, collect money, or assign the person their own room? Did the occupant act like a resident rather than a visitor? Conduct outweighs language. Calling someone a guest while taking $500 a month will not survive scrutiny.
You Do Not Need a Written Lease
Many Oregon property owners believe that refusing to sign anything keeps the arrangement in guest territory. It does not. Because ORS 90.100 recognizes oral rental agreements, a verbal “you can stay in the spare room for $600 a month” creates a month-to-month tenancy on its own.1Oregon Public Law. Oregon Code 90.100 – Definitions
Tenancy can also form through conduct alone, with no explicit conversation. When someone moves in, starts paying a share of the bills on a predictable schedule, and both sides act as though the arrangement is ongoing, a court can find an implied rental agreement. The owner’s intention to avoid becoming a landlord is not required for the law to treat them as one.
Keeping a Long Stay From Becoming a Tenancy
Two tools help a property owner or lead tenant host someone for an extended period without triggering tenant status.
Guest Clauses in a Lease
Renters with a lease should check it. Oregon sets no statewide cap on guest nights, so landlords typically write their own thresholds. Common provisions limit guest stays to 7 to 14 consecutive days or a set number of overnights per month. A guest who overstays those limits can expose the inviting tenant to a for-cause termination notice.
Temporary Occupancy Agreements
ORS 90.275 allows a written temporary occupancy agreement signed by the landlord, the tenant, and the proposed occupant. It permits someone to stay for a defined period without acquiring full tenant rights. For a long visit that everyone knows is coming, this is the cleanest way to keep the arrangement from quietly ripening into a tenancy.
What Changes the Moment Tenancy Attaches
Once the facts cross the line, Oregon’s Residential Landlord and Tenant Act applies in full. Three consequences matter most to someone who did not plan on becoming a landlord.
The property has to be habitable. ORS 90.320 requires working plumbing, adequate heat, safe electrical, hot and cold running water, weatherproof walls and roof, smoke and carbon monoxide alarms, and working locks on entrance doors.2Oregon State Legislature. Oregon Revised Statutes 90.320 – Landlord to Maintain Premises in Habitable Condition A basement that was fine for a friend crashing is now a legal problem if it lacks heat.
Entry becomes restricted. ORS 90.322 requires at least 24 hours’ notice before non-emergency entry, and only at reasonable times.3Oregon Public Law. Oregon Code 90.322 – Landlord or Agent Access to Premises; Remedies The owner can no longer simply walk in.
Ending the arrangement requires written notice and, in many cases, money. In the first year, a no-cause termination needs at least 30 days’ written notice. After the first year, Oregon essentially prohibits no-cause evictions for most rentals. A qualifying landlord reason requires 90 days’ written notice, and landlords owning five or more units must also pay one month’s rent in relocation assistance.4Oregon Public Law. Oregon Code 90.427 – Termination of Tenancy Without Tenant Cause For-cause terminations after the first year require at least 30 days’ notice with a 14-day cure window.5Oregon Public Law. Oregon Code 90.392 – Termination of Tenancy for Cause A landlord who skips these rules can owe up to three months’ rent plus actual damages.
The Cost of Guessing Wrong
Changing the locks, moving someone’s belongings out, or cutting off utilities to force a stay to end are all illegal if the person is a tenant. ORS 90.375 lets a tenant who is unlawfully excluded, or whose essential services are deliberately interrupted, recover up to two months’ rent or twice the actual damages, whichever is greater, plus return of all deposits and prepaid rent.6Oregon Public Law. Oregon Code 90.375 – Effect of Unlawful Ouster or Exclusion ORS 90.435 is blunt: a landlord may not recover possession of a dwelling except through the court process.7Oregon Public Law. Oregon Code 90.435 – Limitation on Recovery of Possession of Premises
The exposure adds up fast. If you have been collecting $1,200 a month from someone you considered a guest, an illegal lockout could cost $2,400 in statutory damages alone, on top of attorney’s fees and court costs. The occupant does not even have to end the arrangement to collect.
When Someone Really Is Still a Guest
If the person has no rental agreement written or oral, no pattern of paying rent, and none of the other markers above, Oregon’s landlord-tenant protections do not apply, and the property owner can ask them to leave without filing an eviction.
The risk is misjudging status. If you treat someone as a guest, lock them out, and a court later finds they were actually a tenant, the self-help penalties above are yours to pay. When any factor from the list points toward tenancy, the safer move is to serve a written termination notice and use the court process rather than bet on the guest label holding up.