Few disputes get personal faster than the ones over a fence line, an overhanging tree, or a neighbor's new structure sitting two feet onto your lot. The property is often your largest asset, the other party lives twenty feet away, and small disagreements calcify into years of hostility. California has surprisingly specific rules for most of these fights. Knowing them early usually resolves the problem before it becomes a lawsuit — and protects you if it does not.
Boundary lines: the survey comes first
Most boundary fights start with an assumption — an old fence, a hedge, a line of sprinkler heads — that turns out not to match the recorded legal description. Before accusing anyone of anything, get a survey by a licensed land surveyor. It is the foundational evidence in every boundary case, and it frequently ends the dispute on its own.
When the survey and the historical use disagree, several doctrines come into play. Under the agreed-boundary doctrine, a line that uncertain neighbors agreed upon and treated as the boundary for years can become the legal line — though modern courts apply it narrowly where a survey can resolve the uncertainty. Long use of a strip of land can also ripen into a prescriptive easement (a right to use) or, rarely, adverse possession (ownership) — but adverse possession in California requires, among other elements, five years of possession and payment of the property taxes on the disputed land, which defeats most claims. Where title itself is clouded, a quiet title action is the vehicle for a binding court determination of who owns what.
Fences: the Good Neighbor Fence Act
Civil Code § 841 — the Good Neighbor Fence Act of 2013 — presumes that adjoining landowners share equally in the reasonable costs of building and maintaining a boundary fence that benefits both properties. The statute has teeth, but also a procedure: a neighbor seeking cost-sharing must give the other owner a written notice at least 30 days before incurring costs, stating the equal-responsibility presumption and describing the problem, the proposed solution, the estimated cost, and the proposed cost split and timeline. A neighbor can rebut the equal-share presumption by showing, for example, that the fence's benefit to them is disproportionately small, that the cost exceeds the value of the benefit, or that financial hardship makes equal sharing unjust. Skipping the notice may jeopardize your ability to recover any share of the bill. Send it, keep proof, and get bids in writing.
Trees: self-help, shared trunks, and treble damages
Tree law rewards restraint. The general rules:
- A tree belongs to the owner of the land where the trunk stands (Civ. Code § 833). If the trunk straddles the line, the tree belongs to both owners jointly (Civ. Code § 834), and neither may remove or seriously damage it without the other's consent.
- Encroaching branches and roots may generally be trimmed back to the property line at your own expense — but only reasonably. You may not enter the neighbor's land, cut beyond the line, or trim so aggressively that you kill or destabilize the tree.
- Damaging someone else's tree is expensive. Civil Code § 3346 and Code of Civil Procedure § 733 authorize double damages — and, for willful and malicious conduct, up to treble damages — for wrongful injury to timber or trees on another's land. Tree valuation experts routinely appraise mature trees at five and six figures. Never let a contractor "just take it down" near a line without a survey and written agreement.
Roots or branches causing actual damage — cracked foundations, blocked sewer laterals — can also support a nuisance claim with damages beyond self-help trimming.
Escalating the right way
Courts expect neighbors to behave reasonably, and judges notice who did. A sensible sequence: document the condition with photos and dates; get the survey or arborist report; send a courteous written request; then a formal demand letter from counsel; then, if needed, suit — typically for trespass, nuisance, quiet title, or declaratory and injunctive relief. Remember that you will still live next to this person after the case ends, and that a recorded lawsuit or unresolved encroachment must be disclosed when you sell. Resolution agreements should be written, recorded where appropriate (boundary line agreements, easements), and precise enough to bind future owners. When the informal route fails, our civil litigation practice takes these disputes from demand letter through trial.
Talk to a California business attorney
If a boundary, fence, or tree dispute is heading toward a fight — or a neighbor's demand letter just arrived — getting the facts and the statute on your side early usually saves the relationship and the money. Schedule a free consultation or call (949) 418-2113.
This article is attorney advertising and provides general information only. It is not legal advice and does not create an attorney–client relationship. The law changes, and this article reflects the law as of its publication date. Every situation is different — contact us to discuss how the law applies to your exact circumstances. See our full disclaimer.
