Someone New Moved Into Your Rental? A 7-Step Plan for Roommates, Partners and Long-Term Guests

You open the doorbell-camera clip and see a stranger carrying in a mattress. Or your tenant texts: “My boyfriend is staying with me for a while, that’s fine, right?” When you live 1,000 miles away, you usually find out about a new occupant late, and the first move you make sets the tone. Here is what the rules actually say and a 7-step plan for owners of one to five doors.

Why it matters to a remote owner

An extra adult can mean more wear, a higher water bill, and someone living in your property whom you never screened. But a heavy-handed reaction can be worse. Some states protect roommates by law, fair housing rules protect families, and a notice with the wrong deadline can delay an eviction by weeks.

The misconception: “Only the people on the lease can live there”

Many leases say the unit may be occupied only by the people listed. That clause doesn’t always hold up.

• New York: a landlord can’t limit occupancy to the named tenants and their immediate family. A lease signed by one tenant is read to allow that tenant’s immediate family, one additional occupant, and that occupant’s dependent children, as long as the tenant (or spouse) lives there as a primary residence. The tenant must give you the occupant’s name within 30 days of move-in or of your request (N.Y. Real Prop. Law §235-f).
• Families with children: under the Fair Housing Act, HUD treats “two persons in a bedroom, as a general rule” as a reasonable occupancy policy, but says that’s rebuttable. Bedroom size, the age of children, and the unit’s layout all matter (HUD occupancy statement, 63 FR 70256). A new baby is not a lease violation.
• Some cities: in Berkeley, when a roommate allowed under the lease moves out, the landlord generally has to let the remaining tenant replace them and can object only on a reasonable basis (Berkeley Rent Board). Other rent-controlled cities have similar rules.

There are also upper limits. Texas caps occupancy at three adults per bedroom, with narrow exceptions. A neighbor living within 3,000 feet can sue a landlord who allows more and recover $500 per violation plus attorney’s fees (Tex. Prop. Code §92.010). Local codes may set their own limits.

Step 1: Find out before you react

Send a friendly, written message: “We noticed someone new may be living at the property. Can you tell us who, and whether they’re staying or visiting?” Many cases are a partner, an adult child back home, or a short visit. Write down the date you learned about it and what the tenant said.

Step 2: Read your lease’s guest clause

Look for three things: who may occupy the unit, how long a guest can stay (14 days in any six months is a common example), and whether subletting needs your written consent. If the lease is silent, your options are narrower. Fix that at the next lease renewal.

Step 3: Check your state and city rules

Before you send anything formal, confirm whether a roommate law, a rent ordinance, or an occupancy cap applies. Our resources and tools page is a starting point, and a local landlord association or attorney can confirm the details.

Step 4: Decide: guest, occupant, or co-tenant

Interpretation, not fact: for most small owners, there are three clean outcomes.

• Guest: the person leaves within the lease’s guest limit. Nothing to sign.
• Approved occupant: they may live there, but aren’t a party to the lease. In New York, an occupant doesn’t gain a right to stay if the tenant leaves, unless you give express written permission (§235-f(6)). Choose your wording carefully.
• Co-tenant: they apply, pass screening, and sign the lease, becoming responsible for rent and damage too.

Adding a co-tenant is often the safest choice for an adult who will stay long term. In California, though, adding adult tenants can affect when just-cause protections kick in (Cal. Civ. Code §1946.2(a)).

Step 5: Screen the new adult like any applicant

Use the same written criteria you use for every applicant, with the person’s signed consent; see our remote tenant screening guide. If you say no, or require a bigger deposit, based on a screening report, federal law requires an adverse action notice naming the screening company and explaining the person’s rights (CFPB).

Step 6: If they won’t cooperate, use the right notice

Deadlines differ by state, which is where remote owners trip up. In Florida, a curable lease violation calls for a written notice giving the tenant 7 days to fix it before you can end the lease (Fla. Stat. §83.56(2)(b)). In California, a tenancy covered by just-cause rules can be ended for subletting in violation of the lease, but curable violations generally need a notice to correct first (§1946.2(b)(1)(B), (G) and (c)). Don’t change the locks or remove belongings yourself. Use the court process.

Step 7: Update your paperwork either way

Once you’ve decided, put it in writing: an addendum naming the occupant or a revised lease listing the co-tenant. Ask your tenant to add the person to their renters policy if the insurer allows it, and tell your own insurer if the number of occupants changes materially; our landlord insurance checklist covers what to ask. If water or electric is in your name, compare the next bill with past months.

Your Monday checklist

1. Add a clear guest-stay limit and subletting clause to your lease template.
2. Write a short, polite “who’s living there?” message you can send in one click.
3. Look up whether your rental’s state or city has a roommate law, rent ordinance, or occupancy cap.
4. Decide in advance when you’ll require an adult to apply and sign the lease.
5. Keep one set of written screening criteria and an adverse action notice template.
6. Save your state’s correct cure-notice form before you need it.
7. File every message, addendum, and notice in the property’s folder.

For the bigger picture, see how to manage an out-of-state property yourself.

This article is for general education only and is not legal, tax or financial advice. Landlord-tenant, fair housing, and occupancy rules vary by state and city and change over time; confirm current rules with official sources or a licensed attorney before changing a lease or sending a notice. Statute details are as of November 2026. The featured image is an AI-generated illustration and does not show a real property.