In California, a trespasser is someone who entered your property without permission and can be removed by police, while a squatter has moved in and established enough signs of living there that the law treats removal as a civil eviction requiring a court order. That difference between a squatter vs. a trespasser in California controls who you call, how long it takes to get the person out, and how much it costs you. Confuse the two and you can either waste days waiting for a lawyer when a phone call to the sheriff would have worked, or try to force someone out yourself and end up on the wrong end of a judgment.
What Separates a Squatter From a Trespasser
A trespasser enters or remains on your land without permission and without any claim to live there. They might be cutting through a lot, camping on vacant acreage, or refusing to leave a business after being told to go. Under California Penal Code 602, that presence is itself a crime, usually a misdemeanor carrying up to six months in county jail, a fine up to $1,000, or both.1California Legislative Information. California Penal Code 19 Penal Code 602.5 adds a separate offense for anyone who enters a residential dwelling without consent, with a tougher charge if someone is home at the time.
A squatter is someone who has moved into a property and is living there without a lease or the owner’s permission. They might have broken into an abandoned home, slipped into a foreclosed house, or taken over a unit that sat vacant long enough for them to set up a household. They have no legal right to be there. But once they have, California generally will not let the police drag them out.
The practical line between the two usually comes down to what officers see when they arrive: furniture inside, utilities connected, mail arriving, clothes in the closet, food in the kitchen. Someone caught climbing through a window tonight is a trespasser. Someone who has been sleeping in a vacant house for weeks, with belongings scattered throughout, is likely to be treated as a squatter by the responding officers even though the owner never gave permission.
From law enforcement’s perspective, that caution has a reason. Officers cannot always tell on the spot whether the person inside is an intruder, a former tenant, a houseguest the owner forgot about, or a legitimate occupant. Pulling someone out of what looks like their residence without a court order risks violating their rights, so the safest path is to send the owner to civil court. That is what typically happens, and it is why timing matters so much.
Removing a Trespasser
Call the police or sheriff and report an active trespass under Penal Code 602. When officers arrive, they will size up whether the person has any colorable claim to residency. If the individual is clearly an intruder with no belongings, no mail, and no signs of living there, officers can order them to leave and arrest them if they refuse. The whole thing can resolve in hours.
Speed is the point. If you discover someone has broken into your vacant property and you call police right away, the situation is far more likely to be handled as criminal trespass. Wait weeks or months and the person may accumulate enough signs of residency that officers reclassify the situation as a civil dispute. For owners of vacant buildings, regular inspections are what keep a cheap problem from becoming an expensive one.
Removing a Squatter
When police tell you it is a civil matter, the path forward is an unlawful detainer lawsuit. That is California’s eviction process, and it applies even when the person never had a lease. From filing to actual removal, expect 30 to 60 days, longer if the local court is backed up.
Filing the Case
You file a Summons (Form SUM-130) and a Complaint (Form UD-100) in the superior court for the county where the property sits.2California Courts. Summons – Unlawful Detainer – Eviction Filing fees as of January 2026 run $240 for claims up to $10,000, $385 for claims between $10,000 and $35,000, and $435 for claims over $35,000.3Judicial Council of California. Statewide Civil Fee Schedule Effective January 1, 2026 The paperwork then has to be formally served on the occupant.
The Response Window
After being served, the occupant has 10 days to file a written response if served in person, or 20 days if served another way. Weekends and court holidays do not count.4California Courts. What Happens if Your Tenant Files a Response If no response comes in, you can ask the court for a default judgment.
Hearing and Lockout
If the occupant does respond, the court sets a hearing. Unlawful detainer cases get priority on court calendars, but the real timeline still depends on the courthouse’s workload. When the court rules for the owner, the clerk issues a Writ of Possession. The sheriff posts a five-day notice on the property, and if the occupant has not left by the end of that period, the sheriff physically removes them.2California Courts. Summons – Unlawful Detainer – Eviction
What You Cannot Do
California strictly prohibits self-help eviction. You cannot change the locks, shut off utilities, remove the occupant’s belongings, or take any other action meant to force someone out without a court order.5California Courts. Eviction Cases in California That rule applies even when the person broke in. The squatter has no right to be there, but you still cannot be the one to physically put them out.
The penalties are real. Under Civil Code Section 789.3, an owner who willfully cuts off utilities to force an occupant out can be hit with actual damages, a penalty of $100 per day for each day of the violation, and attorney’s fees. Those daily penalties add up quickly, and courts have consistently enforced them. The satisfaction of killing the power to a squatter does not come close to a judgment of several thousand dollars running the other way.
Can a Squatter Actually Take Your Property?
Adverse possession is the doctrine squatters would use to claim ownership, and in California it almost never works. Code of Civil Procedure Section 318 gives an owner five years to bring an action to recover land.6Justia Law. California Code of Civil Procedure 318 If the owner does nothing and the occupant meets every element of Section 325, including continuous, open, hostile, exclusive possession for the full five years, the squatter can petition for title.7California Legislative Information. California Code CCP 325
The requirement that kills nearly every claim is the tax one. The occupant must have timely paid all state, county, and municipal taxes assessed against the property for the entire five-year period, proven by certified records from the county tax collector.7California Legislative Information. California Code CCP 325 A squatter living rent-free in an abandoned house is not usually walking into the tax collector’s office to pay someone else’s property taxes under their own name, and an owner who gets tax bills is unlikely to miss years of payments going elsewhere. The scenario is possible but rare.
Keeping Vacant Property From Becoming a Squatter Problem
Prevention costs far less than an unlawful detainer suit. A handful of habits make the difference:
- Inspect vacant properties at least every two weeks. The sooner you find someone, the more likely police can treat the situation as criminal trespass.
- Secure entry points. Board or lock windows, reinforce doors, and repair broken fencing. A property that looks maintained is a less obvious target.
- Post no-trespassing signs. Proper signage strengthens your position under Penal Code 602 and gives officers a clearer basis to act.8California Legislative Information. California Penal Code 602
- Keep utilities and landscaping in minimal working order. An overgrown yard and disconnected power signal abandonment and invite problems.
- Ask your local police department whether they accept a standing “no trespass authorization” form. When one is on file, responding officers can confirm immediately that no one should be inside.
The single most useful thing you can do is move fast. Discover an intruder within hours or days and you are usually looking at a police call. Discover one weeks or months in and you are usually looking at filing fees, forms, service of process, and a month or more of waiting for the sheriff to post a notice.