You rent your property to a carefully screened tenant. You review the application, check the tenant’s credit and income, contact their previous landlord, and sign the lease.

Months later, you discover that the person living in the property isn’t the person you thought you rented to.

Maybe your tenant has moved a friend or relative into the home. Maybe they’ve rented a bedroom to someone else without telling you. Perhaps a guest who was supposed to stay for a few days is still there months later.

Or you may have an entirely different problem: someone has moved into a vacant property without your permission and now claims they have a right to live there.

For landlords throughout Orange County, these situations raise an important question:

What can you legally do when someone is living in your rental property without your permission?

The answer isn’t always to simply tell the person to leave.

California law generally does not allow landlords to take matters into their own hands by changing locks, shutting off utilities, removing belongings, or physically forcing an occupant out.

The appropriate response depends on the person’s relationship to the property and how they obtained possession.

In some cases, the issue may be resolved with a properly prepared notice. In others, the landlord may need to file an unlawful detainer lawsuit and obtain a court judgment before the Sheriff can restore possession.

The first step is understanding who you’re actually dealing with.

Unauthorized Occupant or Squatter? The Difference Matters

An adult living in your rental who isn’t listed on the lease isn’t automatically a squatter.

They could be an unauthorized roommate, subtenant, guest, former tenant, family member, or someone who entered the property without permission.

Those distinctions matter because California’s eviction laws don’t treat every occupant the same way.

Before deciding how to remove someone, determine:

Who allowed the person to move in?
Was the person ever given permission to be there?
Is there a written or oral agreement?
Has the person paid rent?
Who has been receiving the rent?
How long have they been living there?
What does the existing lease say about guests and additional occupants?

Those answers can determine which legal process applies.

Unauthorized Roommates and Subtenants

One of the most common problems for Orange County landlords is discovering that a tenant has allowed another person to move into the property.

It could be a boyfriend or girlfriend, a family member, a friend, or someone who is actually paying the tenant rent.

Your lease may say that only the named tenant is permitted to occupy the property or that subletting requires your written approval.

That doesn’t necessarily mean you can treat the additional occupant as a trespasser.

The person may have entered the property with permission from someone who had lawful possession—your tenant.

What Can a Landlord Do About an Unauthorized Roommate?

Start with the lease.

Look for provisions concerning:

Occupancy limits
Additional residents
Guests
Subletting
Assignment
Landlord approval

If the tenant has violated the rental agreement, a 3-Day Notice to Perform Covenant or Quit may be appropriate when the violation is legally curable.

The notice should identify the specific lease requirement and explain what the tenant must do to correct the violation.

If the tenant removes the unauthorized occupant and otherwise complies with the lease, the problem may end there.

If the tenant refuses to correct the violation, an unlawful detainer may become necessary.

Don’t automatically serve a 3-Day Notice

California’s eviction laws contain different rules for different types of tenancy violations.

The appropriate notice can depend on:

The language of the lease
The nature of the violation
Whether the violation can be cured
Whether the tenant has just-cause protections
The type of property
The length of the tenancy
Other applicable California law

A landlord should determine which notice is legally appropriate before serving it.

When a Guest Won’t Leave

A different problem arises when someone originally had permission to stay but that permission has ended.

A tenant’s friend comes for a weekend and stays for several weeks.

A family member moves in “temporarily.”

A guest in a furnished rental refuses to leave when the agreed-upon stay ends.

At some point, the landlord has to determine whether the person remains a guest or has acquired rights that make the situation more like a landlord-tenant relationship.

Is There a 30-Day Rule for Guests?

Thirty days is an important number in California’s transient-occupancy laws, but landlords should be careful about treating it as an automatic rule.

California law contains exceptions for certain transient occupants, including specific rules concerning hotels, motels, and similar lodging.

A stay of 30 days or more can be an important factor in determining whether someone is still a transient guest or has established a residential tenancy.

But there is no universal rule that every guest automatically becomes a tenant on day 30.

The surrounding circumstances matter.

The original agreement, payments, type of property, and conduct of the parties can all be relevant.

What if the guest hasn’t been there 30 days?

If the person’s permission to stay has ended and they have no right to possession, the owner may have options other than filing a standard residential eviction.

But landlords should not assume that law enforcement will automatically remove the occupant.

If the person claims they are a tenant—or produces documents suggesting that they were given permission to live there—the matter may become a civil possession dispute.

What if they’ve been there much longer?

The longer an occupant remains, the more important it becomes to determine whether tenant protections apply.

If the person has established a tenancy, the landlord may need to follow California’s formal termination and eviction requirements.

Do not attempt a lockout simply because the person was originally invited as a guest.

Squatters in Orange County: What Landlords Need to Know

A person who enters a vacant property without permission presents a different situation.

A property may have been vacant between tenants. It might be undergoing repairs. It could be an investment property that has been sitting empty.

Then someone moves in.

The owner never signed a lease with them and never gave them permission to occupy the property.

That may appear to be an obvious case of trespassing.

But what happens next isn’t always obvious.

What If the Squatter Claims to Be a Tenant?

This is where many cases become complicated.

An occupant may claim they have a lease or some other right to live at the property.

They might produce:

A supposed rental agreement
Mail delivered to the property
A utility bill
A receipt for a rent payment
Text messages
Emails
Other documents purporting to show permission

The landlord may know the document is fraudulent or the claim is completely false.

But determining whether an occupant has a legitimate right to possession can require more than simply looking at the document.

Law enforcement may decline to remove someone when there is a dispute about possession and instead direct the property owner toward the civil court process.

How Do You Evict a Squatter in Orange County?

If an unauthorized occupant has taken possession and refuses to leave, an unlawful detainer action may be necessary.

The unlawful detainer process allows a court to determine who is legally entitled to possession of the property.

If the landlord wins, the court can issue a judgment for possession and the Sheriff can enforce the resulting writ.

The correct legal approach depends on the facts of the particular case.

That is why landlords should not assume that every person they consider a “squatter” can be removed using the same procedure.

What If There Are Unknown People Living in the Property?

Another problem can arise when the landlord knows there are additional occupants but doesn’t know their names.

You may file an eviction against the tenant listed on the lease.

Then, at some point during the case, you discover that several other adults are also living there.

What happens if one of those people claims they were never named or served in the lawsuit?

This is where the Prejudgment Claim of Right to Possession can become important.

Form CP10.5 and Unnamed Occupants

The Prejudgment Claim of Right to Possession, commonly associated with Form CP10.5, provides a procedure for dealing with occupants whose identities are unknown when an unlawful detainer is filed.

When properly used, it gives an unnamed occupant an opportunity to assert a claim to possession during the case.

This can be particularly important in cases involving:

Unauthorized roommates
Subtenants
Former tenants’ family members
Unknown occupants
Squatters
Other adults living at the property

If you believe there are people occupying your rental who aren’t named in the lease or lawsuit, discuss the proper use and service of the prejudgment claim with your eviction professional.

One of the Biggest Landlord Mistakes: Accepting Rent

A landlord may accidentally make an unauthorized occupant’s legal position stronger by treating them like a tenant.

Here’s an example.

Your tenant moves out.

Their roommate stays behind.

The roommate sends you the monthly rent.

You deposit the payment.

You may have just created evidence that you recognize the roommate as a tenant.

Accepting money from an occupant can have consequences depending on the circumstances. It may support an argument that the landlord accepted the person’s occupancy or established a direct landlord-tenant relationship.

That can turn a relatively straightforward unauthorized-occupant problem into a much more complicated tenancy dispute.

Other Actions to Avoid

Landlords should also be careful about:

Accepting a security deposit
Signing an agreement with the unauthorized occupant
Giving the person permission to remain
Giving them keys directly
Adding them to utilities
Giving them parking or building access as an approved resident
Allowing them to remain indefinitely while deciding what to do

If someone you do not recognize as a tenant offers to pay rent, get legal advice before accepting the money.

What Should You Do When You Discover an Unauthorized Occupant?

Finding someone you did not approve living in your rental can create a strong temptation to act immediately.

A better approach is to establish the facts first.

1. Document What You Know

Start building a record of the unauthorized occupancy.

However, do not enter the property improperly or use an inspection as an excuse to search for evidence.

California law places restrictions on landlord entry.

Information you may be able to document lawfully includes:

Vehicles regularly associated with the property
Written statements from the tenant
Text messages and emails
Information from neighbors
Reports from your property manager
Information from contractors or vendors who were legitimately on the property
Public social-media posts
Exterior security-camera footage
Observations made during a lawful inspection

Keep a dated timeline.

If the case eventually reaches court, contemporaneous documentation can be much more useful than trying to reconstruct what happened months later.

2. Figure Out Which Notice Is Required

There isn’t one universal “unauthorized occupant eviction notice.”

Depending on the circumstances, a landlord may need to use:

3-Day Notice to Pay Rent or Quit
3-Day Notice to Perform Covenant or Quit
3-Day Notice to Quit
30-Day Notice
60-Day Notice
Another notice required by the particular tenancy

The correct notice depends on why you’re seeking possession and what legal relationship exists between the parties.

A notice that is appropriate for one tenancy may be completely wrong for another.

Don’t overlook notice requirements

Eviction cases are highly procedural.

If a notice is defective, the landlord may have to start the process over—even when the underlying reason for seeking possession is legitimate.

Make sure the notice is accurate, complete, and properly served, and keep the proof of service.

3. Proceed With an Unlawful Detainer When Necessary

If the occupant does not leave or the tenant does not correct the lease violation, the landlord may need to file an unlawful detainer.

The general process involves:

Filing the appropriate complaint.
Serving the summons and complaint.
Addressing unnamed occupants when appropriate.
Allowing the defendant the legally required time to respond.
Proceeding toward default or trial.
Obtaining a judgment for possession if the landlord prevails.
Obtaining a writ of possession.
Having the Sheriff enforce the judgment.

The landlord should not attempt to perform the physical lockout personally.

Once the court has issued the appropriate writ, the Sheriff handles enforcement of the eviction.

The timeline varies from case to case. An uncontested eviction may proceed much faster than a case involving an answer, motions, a jury demand, or other litigation.

When Should an Orange County Landlord Get Professional Help?

An unauthorized occupant can create much more than a simple lease violation.

The person might be a roommate, subtenant, guest, former tenant, family member, or someone who entered the property without permission.

And the correct legal procedure can change depending on which category applies.

Landlords can create additional problems by:

Serving the wrong notice
Treating every unauthorized occupant as a squatter
Assuming the police will remove the person
Accepting rent
Entering the property improperly
Failing to address unnamed occupants
Changing the locks
Shutting off utilities
Removing the occupant’s belongings

If you own rental property in Orange County and discover someone living there who isn’t supposed to be, getting the process right at the beginning can save considerable time and expense.

Orange County Evictions helps landlords navigate California’s eviction process, including cases involving unauthorized occupants, roommates, subtenants, guests, and squatters.

If you’re dealing with an unauthorized occupant, contact Orange County Evictions to discuss the situation and determine the appropriate next step.

This article is provided for general informational purposes and does not constitute legal advice. California landlord-tenant law changes frequently, and the correct procedure depends on the specific facts of each case. Local requirements may also vary by city. Consult a licensed California attorney before taking action to remove an occupant.