My neighbor's tree roots are lifting my driveway, patio or walkway. What are my options?
By Michael Schuck, ISA Certified Arborist WE-15750A · Last reviewed 2026-10-23
What is actually happening
Tree roots grow in the top 18 inches of soil because that is where the oxygen is, and under a slab the soil stays moist and uncompacted, so roots run along it. As a root thickens it lifts the slab a fraction of an inch a year until a panel tilts or cracks. Liquidambar, Monterey pine, Modesto ash, ficus, camphor and many maples are notorious; coast live oak and redwood do it too.
The fix people reach for, cutting the root and pouring a new slab, fails twice: the tree is harmed or destabilized, and the next root does the same thing in five years. The fix that lasts treats the root system and the hardscape together.
What California law says
- Nuisance. Civil Code 3479: roots that cause real damage to your property can be a private nuisance supporting damages and abatement. Roots that are merely present are not.
- Self-help, with the limit. You may cut roots on your side at your expense, but Booska v. Patel (1994) requires the cutting be reasonable; a neighbor who kills or destabilizes a tree by cutting its roots can be liable for its value.
- Ownership. Civil Code 833 and 834. A street tree is the city's; a tree with its trunk on the line is shared.
- Small claims. Slab repair costs usually fit under the $12,500 small claims limit, where the arborist report is the evidence of cause.
What your city adds
If the tree is protected, significant root cutting may count as damage to a protected tree and require a permit or an arborist's involvement. Several cities also have sidewalk and driveway root programs for street trees. Rules by city →
What the report does for you
- Confirms whose tree it is and that these roots are its roots, by exposure and photographs at the lift.
- Identifies which roots are structural and must stay, and which can be pruned, with distances from the trunk for this tree.
- Specifies a root barrier if one will work: depth, distance, material, and the pruning that has to precede it.
- Recommends hardscape options: re-pour on a thicker base with a root-tolerant design, bridging, pavers on sand, or relocating the panel.
- Cites the Civil Code sections and the city's protected-tree rule, and proposes a cost split both owners can defend.
Dispute Assessment Report, from $850. Neighbor letter on letterhead, $150. Pricing →
What to do this week
- Photograph the lift with a level or straightedge for scale, dated.
- Grind or ramp any trip hazard now; that is cheap and protects you from a liability of your own.
- Do not cut the root until you know whether it is structural.
- Start a report or text photos to (415) 881-0124.
Sources
- Civil Code § 833, § 834, § 3479.
- Booska v. Patel (1994) 24 Cal.App.4th 1786.
- Code of Civil Procedure § 116.221.
Questions people ask
Can I just grind the slab flat?
Yes, and for a trip hazard it is the fastest fix. It does nothing about the root, which keeps growing. Grinding buys a few years; a redesigned slab or a root-pruned, barriered edge solves it.
Can I cut the root that's lifting it?
Roots on your side may be cut, but a root large enough to lift a slab is often a structural root, and cutting it close to the trunk can destabilize or kill the tree. Booska v. Patel makes you liable if it does. The report says where the safe cut is for this tree.
Is the tree owner responsible for my driveway?
If their tree's roots are the cause of actual damage, you have a nuisance claim and a reasonable basis to ask them to share the fix. Most of these resolve with the tree owner paying for root work and barrier on their side and you repairing the slab.
What if it's a street tree?
Then it's the city's tree, and most Bay Area cities have a sidewalk and driveway root program with its own rules and sometimes cost sharing. The report identifies the tree's ownership first.
Will a root barrier work?
Only when installed at the right depth and distance for the species, after root pruning, and not so close to the trunk that it harms the tree. Installed wrong it is an expensive trench. The report specifies it.
When you need a lawyer instead of (or as well as) an arborist
Call a California attorney first if a lawsuit has already been filed, if the damage is over the small claims limit and the other side will not negotiate, or if the dispute is really about where the property line is. We work alongside attorneys every week and the report is written to be used in that setting, but we do not give legal advice and we do not opine on property lines. How we work with attorneys →