Under California Civil Code sections 833 and 834, tree ownership turns on a single fact: where the trunk sits. If the trunk stands entirely on your land, the tree is yours alone. If the trunk crosses the boundary, you and your neighbor own it together. That one distinction decides who can trim it, who can remove it, who pays for its care, and who is on the hook when something goes wrong.
When the Trunk Is Entirely on One Property
Section 833 is a single sentence: a tree whose trunk stands wholly on one owner’s land belongs to that owner, even if its roots grow into a neighbor’s property.1California Legislative Information. California Code Civil Code 833 – Trees Whose Trunks Stand Wholly Upon the Land of One Owner California courts extend the same logic to branches: no matter how far they hang over the fence, the tree still belongs to whoever owns the ground under the trunk.2Justia. Booska v Patel (1994) – California Court of Appeal
Sole ownership carries the full package. The owner decides whether to prune, top, or remove the tree, and the owner pays for that work. A neighbor who dislikes the tree has no right to step onto the owner’s property and interfere with it. California generally does not recognize a right to an unobstructed view or to sunlight, so a tree that blocks either is not a legal grievance against the tree’s owner. What the neighbor can do is trim on their own side of the line, within the limits described below.
When the Trunk Crosses the Property Line
Section 834 treats a tree whose trunk sits partly on two adjoining properties as common property of both owners.3California Legislative Information. California Code Civil Code 834 – Trees Whose Trunks Stand Partly on the Land of Two or More Coterminous Owners The split does not have to be even. A few inches of trunk on the other side is enough to make the tree shared.
Because a boundary tree belongs to both neighbors, neither one can cut it down, top it, or do anything that would seriously injure it without the other’s consent. If you believe a shared tree has become dangerous, the correct move is a written agreement with your neighbor or a court order authorizing removal. Cutting first and arguing later exposes you to the damages described in the next section, and on a mature tree the numbers are punishing.
Trimming an Encroaching Tree on Your Side
California recognizes a self-help right to deal with vegetation that crosses onto your land. Civil Code section 3479 treats anything that obstructs the free use of your property as a nuisance, and section 3502 lets you abate a private nuisance by removing what constitutes it, so long as you cause no unnecessary injury.2Justia. Booska v Patel (1994) – California Court of Appeal In practice, you can cut branches hanging over your yard and roots that have grown under it without asking permission.
The limits are strict. You can only cut up to the property line, never past it. And in Booska v. Patel (1994), the California Court of Appeal held that the right to trim is “bounded by principles of reasonableness.” Cut so aggressively that the tree dies or falls, and you can be held liable. The court emphasized that everyone is responsible for injuries caused by a lack of ordinary care in managing their property, even when exercising a legal right.2Justia. Booska v Patel (1994) – California Court of Appeal
The cost of trimming falls on the neighbor doing it, since self-help is treated as something you choose to do for your own benefit rather than a shared expense. Before cutting large roots or heavy limbs, a written assessment from a certified arborist is worth the money. It tells you which cuts are safe, and it becomes evidence if the tree owner later claims you went too far.
Damages for Wrongfully Harming a Tree
Civil Code section 3346 sets the penalty structure for damaging someone else’s tree, and it is deliberately punitive.4California Legislative Information. California Code CIV 3346 – Damages for Wrongful Injuries to Timber, Trees, or Underwood The statute creates three tiers:
- Willful or malicious damage: the court may award up to three times the actual value of the harm, and must award at least double.
- Casual or involuntary damage: double the actual value of the harm, even if the person honestly thought they were on their own land.
- Damage done under government authority, such as road maintenance: actual damages only.
The multiplier applies to “actual detriment,” not the price of a replacement sapling. For a mature specimen, courts consider replacement cost, diminished property value, and aesthetic loss. A heritage oak appraised at $50,000 can produce a judgment of $100,000 to $150,000. That is why a boundary dispute is not the place to guess.
When Your Tree Causes Damage
Owning a tree carries a duty of reasonable care. A property owner who knows or should know that a tree is hazardous and does nothing is liable in negligence for the injuries or property damage it causes.2Justia. Booska v Patel (1994) – California Court of Appeal The test is what a reasonable person in the owner’s position would have noticed and done.
Warning signs that put an owner on notice include visible decay, dead limbs, fungal growth at the base, a pronounced lean, or a history of dropping branches. You do not need to be an arborist, but you do need to pay attention. “I didn’t notice” is not a defense when the signs were obvious.
A healthy, well-maintained tree that comes down in a severe storm is a different case. With no negligence and no foreseeable failure, the owner is unlikely to be responsible. That analysis flips the moment there were warning signs the owner ignored: a leaning tree with exposed roots that finally topples in wind is a negligence case, not a weather event.
Slow-moving damage from roots lifting a driveway or branches abrading a roof can also support a nuisance claim. Because the harm develops gradually, the neighbor generally needs to give the tree owner notice and a reasonable chance to fix the problem before liability attaches.
Local Ordinances Can Override Your Right to Remove
Sole ownership under Section 833 does not automatically let you cut a tree down. Many California cities and counties have tree preservation ordinances requiring a permit before removing certain trees on private property, particularly heritage trees, trees above a certain trunk size, and native species. Penalties for removing a protected tree without a permit can run into tens of thousands of dollars per tree and often require you to plant multiple replacements.5City of San José. Tree Removal Permits Before taking down anything sizable, call your city’s planning or public works department. A tree that is legally yours can still be illegal to remove.
How Boundary Tree Disputes Actually Get Resolved
Most of these disputes never see a courtroom. A conversation with the neighbor, before anyone starts cutting, ends the majority of them. When ownership itself is contested, a professional land survey answers the question, and that cost is small next to the exposure from cutting a tree that turns out to be shared property.
When direct talks stall, mediation is the next step. Many California counties run community mediation programs at low or no cost, and written mediation agreements are enforceable. If mediation fails, California small claims court handles property damage claims up to $10,000 for businesses and $12,500 for individuals. Larger claims, or a request for an injunction ordering removal, belong in civil court. In either forum, an early boundary survey and a written arborist assessment strengthen your position and often convince the other side to settle before a judge has to.