You rent your property to one person after carefully screening the applicant, checking their credit, verifying their income, and contacting their previous landlord.

Then you discover that someone else has moved in.

Maybe it’s a friend or family member your tenant never mentioned. Maybe the tenant has quietly sublet the property. Maybe a guest who was supposed to stay for a few days has been there for months. Or perhaps someone has moved into a vacant property without permission and now insists they have a right to remain.

For Riverside County landlords, these situations can create a difficult question:

How do you get someone out of your rental property when they aren’t supposed to be there?

The answer isn’t always as simple as telling the person to leave.

One of the biggest mistakes a landlord can make is assuming that an unauthorized occupant can simply be removed by changing the locks, shutting off the utilities, or putting their belongings outside.

California’s eviction laws generally require landlords to follow a specific legal process when an occupant has a potential right to possession. Depending on the circumstances, that process can involve a notice, an unlawful detainer lawsuit, a court judgment, and ultimately enforcement by the Sheriff.

The first step is determining exactly what kind of occupant you’re dealing with.

Who Is Living in Your Rental Property?

Not everyone who isn’t listed on a lease is legally considered a squatter.

An unauthorized roommate, a subtenant, a long-term guest, a former tenant, and someone who entered a vacant property without permission can all present very different legal issues.

Understanding how the person came to occupy the property is critical because it can determine what notice is required and how the eviction should proceed.

Unauthorized Roommates and Subtenants

One of the most common scenarios is discovering that your tenant has allowed another person to move into the rental.

Perhaps the tenant’s partner moved in. Maybe a friend is paying part of the rent. Or the tenant may have effectively sublet the entire property to someone else.

If the lease prohibits additional occupants or subletting without the landlord’s approval, this may constitute a violation of the rental agreement.

However, the person living in the property may still have entered with permission from someone who had lawful possession.

That makes this situation different from a stranger who breaks into an empty house.

How should a Riverside landlord handle an unauthorized roommate?

The starting point is usually the lease.

Look at the provisions dealing with:

Occupancy
Subletting
Assignment
Guests
Additional residents
Landlord approval

If the tenant has violated one of those provisions, a 3-Day Notice to Perform Covenant or Quit may be appropriate when the violation can legally be cured.

The notice should clearly identify the lease requirement that was violated and explain what the tenant must do to correct the problem.

If the unauthorized person leaves and the tenant is otherwise in compliance, the issue may be resolved without an eviction lawsuit.

But if the tenant does not correct the violation, the landlord may have grounds to proceed with an unlawful detainer.

Don’t assume every subtenant requires the same notice

California eviction law is highly dependent on the facts.

The type of tenancy, the lease language, whether the tenant has an applicable just-cause protection, and the nature of the unauthorized occupancy can all affect the proper procedure.

A notice that works in one situation may be defective in another.

That’s why it is important to determine the occupant’s status before serving the notice.

When a Guest Refuses to Leave

Another problem occurs when someone who originally had permission to be at the property simply doesn’t leave.

Maybe your tenant allowed a friend to stay for a few weeks.

Maybe a family member moved in temporarily.

Maybe the property is being used as a short-term rental and the guest refuses to check out when the reservation ends.

The longer someone remains, the more important it becomes to determine whether the person is still a guest or has developed rights associated with a tenancy.

Does 30 Days Make Someone a Tenant?

You’ll often hear landlords say that “30 days makes someone a tenant.”

The reality is more complicated.

California law contains specific rules concerning transient occupancy, including exceptions involving hotels, motels, and similar lodging. A stay of 30 days or more can be an important factor when determining whether an occupant should be treated as a residential tenant rather than a transient guest.

But there is no universal rule that every person automatically becomes a tenant at midnight on the 30th day.

The details matter.

The original agreement, the type of property, payments, the parties’ conduct, and other circumstances can affect the legal relationship.

A short-term guest isn’t necessarily easy to remove

If someone’s authorized stay has ended and they have no legal right to remain, the owner may have remedies other than a traditional residential eviction.

But landlords should be cautious about assuming that the police will simply remove the person.

If the occupant claims to be a tenant or produces something suggesting they were given permission to live there, law enforcement may consider it a civil dispute.

At that point, the owner may need to pursue the appropriate court process.

What about a guest who has been there for months?

The longer the person remains, the greater the risk that they may assert tenant rights.

If the facts indicate that a landlord-tenant relationship exists, the owner may need to comply with California’s termination and eviction requirements.

Do not change the locks simply because the original arrangement was supposed to be temporary.

What About Squatters in Riverside County?

Squatters are a different category.

A true squatter generally has no lease, no permission from the owner, and no connection to a tenant who had lawful possession.

Someone may enter a vacant rental property, move into a house between tenants, or occupy a property that has been sitting empty.

The owner may immediately think:

They broke in. They’re trespassing. Why can’t the police just remove them?

Sometimes they can.

But not every squatter situation is that straightforward.

When a Squatter Claims to Have a Lease

One of the biggest complications occurs when an occupant produces something that appears to establish a right to live in the property.

For example, they might show:

A purported rental agreement
Mail delivered to the address
A utility account
A receipt for a rent payment
A text message allegedly giving them permission
Other documents they claim prove they were authorized to occupy the property

Whether those documents are legitimate is a different question.

Law enforcement may not be willing to determine that question at the property.

If officers cannot establish that the person is clearly trespassing, they may direct the property owner toward the civil court process instead.

That is why a situation that appears to be a simple squatter problem can turn into an unlawful detainer case.

How Do You Get a Squatter Out of a Riverside Property?

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

An unlawful detainer is the California court process used to determine the right to possession and, when the property owner prevails, allow possession to be recovered through the legal eviction process.

The appropriate legal theory depends on how the occupant entered the property and what facts can be established.

The important thing for a landlord is to avoid treating every unauthorized occupant as though they are legally identical.

What If You Don’t Know the Occupant’s Name?

This is an issue landlords sometimes discover too late.

You may know your tenant’s identity, but you may not know who else is living in the property.

Perhaps there are several people inside who were never listed on the lease.

What happens when you win the eviction against the named tenant but one of those unidentified occupants claims they were never part of the lawsuit?

California has a procedure specifically addressing unnamed occupants in unlawful detainer cases.

Prejudgment Claim of Right to Possession

The Prejudgment Claim of Right to Possession, commonly associated with Form CP10.5, can be an important tool when a landlord does not know the names of everyone occupying the property.

When properly used, the procedure gives unnamed occupants an opportunity to assert a claim to possession during the case rather than waiting until the Sheriff arrives to enforce the judgment.

This is especially important in cases involving:

Unauthorized roommates
Subtenants
Unknown occupants
Former tenants’ family members
Squatters
Other adults whose identities are unknown

If you believe there are unidentified occupants at the property, discuss the appropriate use and service of the prejudgment claim with your eviction attorney or professional before filing the case.

Don’t Accidentally Turn an Unauthorized Occupant Into Your Tenant

Sometimes the landlord’s own actions make the situation more complicated.

Consider this example:

Your tenant has moved out.

Their roommate remains behind.

A few days later, the roommate sends you the monthly rent through Zelle.

You deposit it because you don’t want to lose the money.

Now you may have created an argument that the roommate has a direct landlord-tenant relationship with you.

Accepting money from an occupant can be evidence that you recognized the person’s right to occupy the property, depending on the circumstances.

That can change the legal analysis entirely.

What Should a Riverside Landlord Do After Discovering an Unauthorized Occupant?

Once you discover someone living in your rental who isn’t supposed to be there, resist the temptation to act immediately.

A few careful steps can prevent a much larger problem later.

1. Establish the Facts

Start by documenting what you know.

That doesn’t mean entering the property without authorization or searching through someone’s belongings.

California law limits when and why a landlord may enter a rental property.

Instead, document information you can lawfully obtain, such as:

Vehicles regularly parked at the property
Information provided by the tenant
Written communications
Statements from neighbors
Information from a property manager
Information from contractors or vendors who were lawfully present
Public social-media posts
Exterior security-camera footage
Observations made during a lawful inspection

Keep dates and details.

A clear timeline can become valuable evidence if the dispute eventually reaches court.

2. Determine Which Notice Applies

Once you understand the situation, determine what legal notice—if any—is required.

Depending on the circumstances, that could include:

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 California law

The fact that someone isn’t listed on the lease does not by itself determine which notice should be served.

The reason for the termination and the legal status of the occupant matter.

Notice errors can derail an eviction

Eviction cases are procedural.

If the notice is defective, the landlord may have to start over even if the underlying complaint against the tenant is legitimate.

That means the notice should be carefully prepared and served according to California law.

Keep the original notice, a copy, and proof of service.

3. File an Unlawful Detainer When Necessary

If the occupant or tenant does not comply with the applicable notice, the next step may be an unlawful detainer lawsuit.

The process generally involves:

Filing the appropriate complaint.
Serving the summons and complaint.
Addressing unnamed occupants when appropriate.
Allowing the defendant the required time to respond.
Proceeding toward default or trial, depending on the response.
Obtaining a judgment for possession if the landlord prevails.
Obtaining the writ of possession.
Turning the writ over to the Sheriff for enforcement.

The Sheriff—not the landlord—is responsible for physically enforcing the eviction.

The amount of time involved varies significantly depending on whether the tenant contests the case, files motions, requests a jury, or otherwise challenges the eviction.

An uncontested case may move much faster than a heavily contested one.

When Should You Call a Riverside Eviction Professional?

An unauthorized occupant can create a surprisingly complicated eviction.

The person could be a roommate, subtenant, guest, former tenant, family member, or true trespasser.

And the landlord’s first assumption isn’t always legally correct.

The biggest problems often arise when a landlord:

Uses the wrong notice
Assumes a squatter can always be removed by police
Accepts rent from an unauthorized occupant
Fails to account for unknown occupants
Enters the property improperly
Changes the locks
Shuts off utilities
Attempts to remove belongings without following the legal process

If you own rental property in Riverside County and discover an unauthorized occupant, getting the process right from the beginning can save considerable time, expense, and frustration.

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

If you’re dealing with someone who is living in your property without authorization, contact Riverside Evictions to discuss your 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 appropriate procedure depends on the facts of each situation. Consult a licensed California attorney before taking action to remove an occupant.

Unauthorized Occupants and Squatters in Riverside