Can You Defend Your Property in California? Castle Doctrine & Limits

When it comes to defending your property in California, you can use reasonable physical force to stop someone from stealing, damaging, or trespassing on what belongs to you, but you cannot use deadly force to protect property alone. That line is the whole framework: force has to match the threat, and a threat to your belongings by itself never justifies killing or seriously injuring someone.

What Reasonable Force Actually Looks Like

California Penal Code 693 gives you the right to use force against someone unlawfully trying to take or damage property in your possession.1California Legislative Information. California Penal Code 693 You can also defend property belonging to a family member or a guest.2California Legislative Information. California Penal Code 692 The force you use must be what a reasonable person would consider necessary under the circumstances.

In practice, that means you can grab back a stolen item, push away someone trying to break into your car, or physically escort a trespasser off your land. If the trespasser resists, you can meet that resistance with a proportionate increase in your own force. What you cannot do is shoot someone running off with your bicycle or beat someone unconscious for taking a package off your porch. The response has to fit the threat, and a threat to things alone stays on the non-deadly side of the line.

When Deadly Force Becomes Lawful

The threshold for deadly force shifts from property to people. Penal Code 197 lists the circumstances where a homicide is legally justified, including resisting an attempt to murder someone or to commit a felony involving great bodily injury, and defending your home or any person against someone who clearly intends to commit a violent felony.3California Legislative Information. California Penal Code 197

Reading the statute on its own, you might think any felony would do. California courts narrowed that reading. In People v. Ceballos (1974), the California Supreme Court held that deadly force is justified only to prevent a “forcible and atrocious” crime, meaning an inherently violent offense like robbery, kidnapping, or sexual assault where the victim faces a real risk of death or serious physical harm.4Justia Law. People v Ceballos, 12 Cal 3d 470 A nonviolent felony like embezzlement or credit card fraud would never justify a lethal response, even though those are technically felonies.

Two requirements apply every time. Your belief that you or someone else faced imminent danger of death or severe injury has to be both genuine and objectively reasonable. Someone yelling threats from across the street is not the same as someone lunging at you with a weapon. And the danger has to demand an immediate response. If the threat has passed or you have time to call the police, the justification for deadly force is gone.

The Castle Doctrine for Your Home

Inside your home, California gives you a meaningful advantage. Under Penal Code 198.5, sometimes called the Castle Doctrine, if someone unlawfully and forcibly enters your residence, the law presumes you reasonably feared imminent death or great bodily injury. That presumption can support the use of deadly force without requiring you to prove the intruder specifically threatened you.5California Legislative Information. California Penal Code 198.5

The presumption has clear limits. It applies only when all of these are true:

The statute uses the word “residence.” California case law is limited on whether that extends to areas just outside your home like a porch, an attached garage, or a fenced yard. If a confrontation happens in your driveway rather than inside the house, the 198.5 presumption may not apply, and your use of force would be judged under the general self-defense rules instead.

One thing the Castle Doctrine does not require is retreat. You have no obligation to flee from room to room or slip out a back door before defending yourself inside your own home.

Outside the Home: No Duty to Retreat, for Now

California does not have a stand-your-ground statute on the books. The no-duty-to-retreat rule comes from appellate court decisions and is reflected in the standard jury instruction: a defendant “is not required to retreat” and “is entitled to stand his or her ground and defend himself or herself and, if reasonably necessary, to pursue an assailant until the danger has passed.”7Justia. CALCRIM No 3470 – Right to Self-Defense or Defense of Another

If you are legally present somewhere and face an imminent threat of death or great bodily injury, you can defend yourself with proportionate force without first trying to run. Unlike inside your home, there is no automatic presumption that your fear was reasonable. You would have to show that a reasonable person in your position would have believed the threat was real and immediate.

This may be changing. AB 1333, introduced in the 2025–2026 legislative session, would require you to retreat when outside your home if you could do so with complete safety before using deadly force.8California Legislative Information. AB 1333 If it becomes law, California’s approach outside the home would shift substantially. Anyone relying on the current no-retreat rule should watch this bill.

Booby Traps Are Off Limits

Some property owners think about rigging traps to catch burglars while they are away. California makes this a felony regardless of the circumstances. Penal Code 20110 prohibits assembling, placing, or maintaining a booby trap, with a prison sentence of two, three, or five years. Even possessing a device with the intent to use it as a booby trap is a crime punishable by up to a year in county jail, a fine of up to $5,000, or both.9California Public Law. California Penal Code 20110

The Ceballos case that shaped California’s deadly force rules actually involved a spring gun set up inside a garage. The Supreme Court held that a property owner could not use a mechanical device to do what they could not lawfully do in person: use deadly force against a nonviolent intruder.4Justia Law. People v Ceballos, 12 Cal 3d 470 A trap cannot evaluate whether the person entering actually poses a threat to life, which is exactly why the law bans them.

What Happens If You Go Too Far

Using more force than the situation warrants carries serious consequences. If you kill someone while honestly but unreasonably believing you were in imminent danger, California treats it as “imperfect self-defense.” That is not a complete defense. It reduces what would otherwise be murder to voluntary manslaughter by eliminating the element of malice.10Justia. CALCRIM No 571 – Voluntary Manslaughter: Imperfect Self-Defense

Voluntary manslaughter is a felony carrying three, six, or eleven years in state prison. It also counts as a serious felony under California’s Three Strikes law, which would double the sentence on any future felony conviction and could lead to 25 years to life on a third strike. Excessive force that does not kill can still bring assault or battery charges depending on the injuries.

Civil Lawsuits Are a Separate Problem

A criminal acquittal does not shield you from a civil lawsuit. Criminal cases require proof beyond a reasonable doubt. Civil cases use the much lower “preponderance of the evidence” standard, meaning the injured party only needs to show it was more likely than not that your actions were wrongful. Someone you injured in a defensive encounter can sue for medical costs, lost income, and pain and suffering even if prosecutors never filed charges or a jury acquitted you.

Even a justified use of force can lead to years of litigation and significant financial exposure. Homeowner’s and renter’s insurance policies sometimes cover certain liability claims, but many exclude intentional acts. After any defensive force incident, talking to an attorney matters as much for the civil side as for the criminal one.