Unauthorized Occupants and Overstaying Guests: What Landlords Can Do

A landlord notices an extra car in the lot, a second toothbrush in the photos from the last inspection, or a neighbor mentions that the tenant's cousin has been "staying a while." The lease names two adults, and now there may be a third. What you can do depends on who that person is, how long they have been there, and what your lease and local law say.

This guide explains the difference between guests, unauthorized occupants, subtenants and squatters, how to write and enforce occupancy clauses, how to discover and document the problem, the lawful response sequence, why self-help backfires, and how adding the person through screening is often the cleanest fix. It is part of our landlord challenges hub for independent landlords and small property managers.

Note: This article is general education, not legal advice. Landlord-tenant, guest, eviction and fair housing rules vary by state and municipality and change over time. Consult a local attorney before serving a notice or starting a court case.

Guests, unauthorized occupants, subtenants and squatters

These terms get mixed up, and the label changes your options. Use the table as a starting point, then check how your lease and state define each one.

The difference between the second and fourth rows matters most. An unauthorized occupant came in through your tenant, who signed a lease with you. A squatter came in with no connection to a lease at all. Most landlords who think they have a squatter actually have an unauthorized occupant, and the tenant is the person you hold responsible.

Subletting is a separate and common problem. If your tenant is collecting money from the new person, read our guide to what to do when a tenant sublets without permission.

Lease occupancy and guest clauses that make enforcement possible

You can only enforce a rule you wrote down. A strong lease turns "someone seems to live here" into a clear violation. Our guide to lease addendum types landlords use and when to add them covers how to add terms to an existing lease. These clauses are worth adding with your attorney:

• Named occupants. List every person who will live in the unit. Say that no one else may live there without written approval.
• A guest limit. Define how long a guest may stay before they count as an occupant, such as a set number of consecutive nights or total nights in a 12-month period. Courts in some places look closely at vague phrases like "reasonable time."
• An approval process. Say that a new adult occupant must apply and be screened the same way the original tenants were, and that approval must be in writing.
• Subletting and short-term rental limits. Prohibit subletting, assigning and listing the unit on short-term rental sites without your written consent.
• A remedy. State that an unapproved occupant is a lease violation, with cure steps such as removal or an application within a set number of days.

Base the guest limit on local law, not a hunch. A limit that is too short can look like control over a tenant's family, and local law may protect certain long-term visitors, such as a live-in aide for a tenant with a disability.

How to discover and document an unauthorized occupant

Start with facts, not suspicion. A single overnight visitor is not a violation. A pattern is.

Things that may point to an extra occupant

• Utility usage or trash volume that jumps without explanation.
• New vehicles parked regularly, or parking complaints from neighbors.
• Mail, packages or deliveries addressed to someone not on the lease.
• Photos or notes from a required inspection or maintenance visit showing another person's belongings or bedroom setup.

How to document without crossing a line

1. Record only what you lawfully observe. Note dates, times, what you saw in plain view, and who was present when you were there for an entry that complied with your state's notice requirement.
2. Keep neighbor and maintenance reports in writing. Treat them as leads, not proof.
3. Do not enter without proper notice. Entering to look for evidence, outside the rules for entry in your state, creates its own problem for you.
4. Ask the tenant. Send a polite written message asking who else is living in the unit and noting what you have observed.

Our guide to landlord documentation best practices that reduce risk and support decisions explains how to keep a clean timeline you can hand to an attorney or a judge.

The lawful response sequence

Exact steps and notice periods depend on your state and city, but the order is usually the same.

1. Review the lease and the facts. Confirm the occupancy and guest language, and decide whether this is a guest, an unauthorized occupant, a subtenant or a possible squatter.
2. Send a written inquiry or reminder. Ask who is living in the unit, quote the lease clause and give a short deadline to respond. Many situations end here.
3. Offer a cure. Give the tenant a written choice: the person moves out by a stated date, or applies to be added and is screened. Say clearly which is acceptable.
4. Serve a lease violation notice if the problem continues. Use the notice type your state requires, such as a notice to cure or quit, with the right content, delivery method and time period. Under California Civil Code section 1946.2, for example, a violation of a lease term after written notice to correct it is one at-fault ground for ending a tenancy, and the same section lists unauthorized assignment or subletting as another. For curable violations, the owner must first give written notice and a chance to cure. Other states use different notice forms and timelines.
5. File in court if the notice period expires. A lawful eviction goes through a court, not through the landlord. See our guide to how to evict a tenant legally step by step.

If you believe the person is a true squatter with no connection to your tenant, the process is different, and some states have fast-track options. Florida, for example, under Florida Statute 82.036, allows an owner to ask the county sheriff to remove people who entered unlawfully, but only if conditions are met, including that the occupants are not current or former tenants under an authorized rental agreement, and the owner signs a verified complaint under penalty of perjury. A wrongful removal can expose the requester to damages, including statutory damages equal to triple the dwelling's fair market rent. That law is narrow and is not a way to remove your tenant's cousin. Check your own state before assuming a similar option exists.

Why self-help is risky

Changing the locks, removing belongings or shutting off utilities feels fast, but it is one of the most expensive mistakes a landlord can make.

• Lockouts. California Civil Code section 789.3 bars a landlord who is trying to end a tenancy from blocking the tenant's reasonable access, such as by changing the locks.
• Utility shutoffs. The same section bars willfully interrupting services such as water, heat, electricity and gas, even when the landlord does not control the utility.
• Removing belongings. The section also bars removing a tenant's belongings without written consent, except through the lawful procedure for abandoned property.
• The cost. The remedies can include actual damages, additional statutory damages for each day the violation continues, and attorney's fees for the prevailing party.

Other states have their own statutes and penalties. The safest rule is to use notices and court. This applies to unauthorized occupants too, because the occupant may claim to be a tenant, and the tenant of record is still entitled to the process.

Fair housing and consistency

Occupancy rules can create fair housing risk when they are applied unevenly. Familial status is a protected class under the federal Fair Housing Act, and a rule that targets families with children can be unlawful. Per HUD's 1998 notice adopting the 1991 Keating memorandum, HUD believes that an occupancy policy of two persons in a bedroom, as a general rule, is reasonable, but that is rebuttable, and HUD also looks at the size of the bedrooms and unit, the age of the children, the unit configuration, and state and local law. HUD also looks for signs of pretext, such as enforcing a policy only against families with children.

In practice, that means:

• Write one occupancy standard and one guest limit, and apply them to every unit in the same way.
• Do not target a tenant because of who the new occupant is, including a partner, a relative, a family with a child, or a person with a disability or a live-in aide.
• Keep the same paper trail for every tenant, so you can show you would have done the same for anyone else.

Read our fair housing compliance guide for reducing discrimination risk before you enforce an occupancy clause for the first time.

Adding the occupant through screening as a solution

Many unauthorized occupant cases end the simplest way: the person applies, passes your criteria, and is added to the lease. It keeps a good tenant in place, brings the new adult under the lease with the same obligations, and ends the violation.

1. Offer the option in writing. Give a deadline and say the person must complete the same application as any other adult.
2. Screen using the same criteria. Use the same credit, criminal and eviction checks, income standard and documents you require for every applicant.
3. Decide based on your written criteria. If the person does not meet them, tell them what to do next and follow the adverse action rules that apply.
4. Sign an addendum or amendment. Add the new occupant to the lease in writing, with signatures from every adult tenant and the landlord.

If the person is not approved and does not leave, you are back at the violation notice with a cleaner record.

Frequently asked questions

How long can a guest stay in a rental before they are an unauthorized occupant?

It depends on your lease and local law. Many leases set a limit such as a number of consecutive nights, and a clear written limit is much easier to enforce than a vague one.

Can I evict a tenant for having an unauthorized occupant?

Possibly, but only through your state's notice and court process. Violating an occupancy clause can be grounds for termination, and many states require a notice and a chance to cure first.

Can I change the locks if someone is living in my rental without permission?

Not if the person is a tenant or tenant's occupant. Lockouts, utility shutoffs and removing belongings can create liability, such as the damages available under California Civil Code section 789.3.

What is the difference between a squatter and an unauthorized occupant?

An unauthorized occupant moved in through a tenant who has a lease with you. A squatter entered with no permission from anyone with authority, and some states have a special removal process for that case.

Can the new occupant just be added to the lease?

Yes, in most cases. Have the person apply, screen them with the same criteria as every other adult, and sign a written addendum with every adult tenant and the landlord.

What to do next

Handling an unauthorized occupant comes down to a repeatable process: a clear lease, a dated record of what you saw and sent, an offer to cure, and the same screening and paperwork for every adult. Small landlords usually lose ground when the story lives in scattered texts, the screening standard was never written down, and no one can find the signed lease addendum later.

Shuk keeps the process consistent. Tenant screening runs through a screening partner, with credit, criminal and eviction reports, pass criteria you set such as minimum credit score and rent-to-income ratio, and document requests for photo ID and proof of income, while you make the final decision. Unlimited Adobe-powered e-signatures let every adult sign the lease addendum you prepare, with a record of when each person signed. Property Documents keeps the lease, the addendum and your notices together inside each property, and centralized in-app messaging with email and push notifications keeps your written inquiries and the tenant's replies in one thread.

At as low as $2 per unit per month, with no setup fees and no contract, and with White Glove Onboarding included at no additional cost, Shuk makes a consistent, well-documented occupancy process feasible for landlords and property managers up to 200 units.

Book a demo at shukrentals.com/book-a-demo to see how screening with landlord-set pass criteria, e-signatures, Property Documents and in-app messaging work together so every added occupant is screened the same way and every signed addendum is easy to find.