A word about what this page is. Modesto Tree Care connects homeowners with tree service providers; we are not lawyers, and nothing here is legal advice for your situation. What follows summarizes general California principles as described in published legal sources, so that when you call your insurer or an attorney you know which questions to ask. Facts on the ground — what the tree looked like, who said what to whom, what your policy says — decide every real case.
Whose tree is it?
California answers this by where the trunk stands. Under Civil Code §833, a tree whose trunk is entirely on one owner's land belongs to that owner, even if its branches hang over the neighbor's yard or its roots run under the neighbor's driveway. Under §834, a tree whose trunk sits on the boundary line is owned by both neighbors together, and neither can remove it without the other's agreement. Ownership matters because it's the starting point for who was responsible for maintaining the tree.
The tree fell. Who pays?
The instinct is "their tree, their problem." California doesn't work that way. The general standard is negligence: the tree's owner is responsible for the damage if they knew, or reasonably should have known, that the tree was dangerous — dead, visibly rotten, hollow, already dropping limbs, leaning with the ground moving — and didn't do anything about it. If the tree was healthy and reasonably maintained and a storm took it down, that's generally treated as an act of nature: nobody was negligent, and the damage falls on the property it landed on.
In practice that means: your homeowner's insurance is the first call when a neighbor's tree hits your house, regardless of whose tree it was. Your insurer covers your damage under your policy, and if there's a credible negligence case against the neighbor, your insurer may pursue it. If the tree was obviously dead and you'd warned the neighbor in writing, tell your adjuster that on day one — it changes the conversation.
The same standard runs the other way. If your tree has a dead crown leaning over the neighbor's roof and you've been meaning to deal with it, you are the one who "should have known." The warning-signs guide describes exactly the conditions a court would consider obvious.
Overhanging branches and roots
The general California rule is that you may trim branches and roots that cross onto your property, back to the property line, at your own expense — whether or not they're causing damage. The limits are real, though: you have to act reasonably, you can't cut in a way that damages or kills the tree, and you cannot go onto the neighbor's land to do it (that's trespass). Over-cutting is where this goes wrong. Civil Code §3346 lets a court award double or, for willful and malicious injury, treble damages for wrongful harm to someone else's tree — including its replacement cost and lost shade and value. A hard cut that kills a boundary oak can cost far more than the trim was worth. Talk to the neighbor first; if you're removing anything substantial, have a provider who understands this do it, and keep it to your side of the line.
The neighbor's tree looks dangerous — what now?
- Document it. Dated photos of the dead crown, the lean, the fungus at the base, the hung-up limb. The five-minute self-check is a good template for what to capture.
- Tell them, in writing. A friendly email or text describing what you see and asking them to have it looked at. If there's no response, a letter by certified mail. Written notice is the difference between "should have known" and "knew."
- Offer to split an assessment. An on-site look from a provider is cheap relative to a roof, and a neighbor who says yes is a neighbor who's now on notice too.
- Check whether it's a City tree. If the tree is in the parking strip, it may be the City's, not the neighbor's — see the permit page for who to call in Modesto, Ceres, and Turlock.
- Talk to your insurer before it falls if you're worried. Some will note the concern on your file; all of them would rather hear about it now.
The tree already fell — first 24 hours
Safety first, then photos, then your insurer, then a provider — in that order. Stay away from anything touching a power line and call your electric utility. Photograph everything before it moves, including the base of the tree on the neighbor's side if you can see it without entering their property (a rotten stump is evidence). Call your insurer and ask what they need before removal starts. Then get the tree off the structure; the emergency page walks through what to expect and what it costs. Don't cut anything yourself, and don't let the neighbor's cousin with a chainsaw start either — a tree resting on a roof is under load.
Where this information comes from, and its limits
The ownership rules (Civil Code §833 and §834), the self-help trimming principle and its limits, the negligence standard for fallen trees, and the §3346 damages provision are summarized here from published California legal commentary as of September 2026. Statutes get amended and cases refine how they're applied, and none of this accounts for your policy language, an HOA, or a written agreement with your neighbor. For anything with money on the line, talk to a California attorney.
Need a tree on your property assessed, trimmed back to the line, or removed? We'll match you with a local provider who serves your part of Stanislaus County.