Oregon neighbor tree law: boundary trees, overhanging branches, fallen trees

ORS 105.810: treble damages for cutting someone else’s tree

Oregon’s timber trespass statute is the rule every other question on this page sits under. ORS 105.810(1) makes a person who, without lawful authority, willfully injures, severs or removes trees, timber, produce or shrubs from another person’s land liable for three times the damages assessed. The statute covers private land, public land and the strip in front of a house along a street. Once the plaintiff proves ownership and proves that the defendant did the cutting, the statute treats the act as prima facie willful and without consent; the defendant has to explain.

Three features matter to homeowners. First, the court can add the winner’s litigation costs, including investigation costs and attorney fees, at its discretion (105.810(2)). Second, it can award reasonable reforestation costs (105.810(3)). Third, treble damages are the whole remedy: the Court of Appeals held in Harris v. Wright, 81 Or App 126 (1986), that punitive damages are not available on top. More recently, Simington Gardens, LLC v. Rock Ridge Farms, LLC, 308 Or App 661 (2021), confirmed that willfully injuring trees violates the statute even when the defendant was lawfully on the land, which is the situation of a neighbor who walks over to “help” with a hedge.

A contract logger who follows the statutory steps, a signed contract, a legal description, marked boundaries and a deed check, owes only actual damages (105.810(4) to (6)). That exception is for timber operations, not for a tree service hired to drop a fir in a subdivision. If the crew you hire cuts the wrong tree, the crew and the person who directed it can both be defendants.

ORS 105.815: double damages when the trespass was casual or involuntary

ORS 105.815(1) reduces the award from treble to double damages when the trespass was “casual or involuntary”, or when the defendant had probable cause to believe the land was their own, or their employer’s, or belonged to the person for whom they were working. Costs and reforestation can still be added (105.815(2)). In a neighbor dispute this is the difference between a crew that misreads an unmarked line and one that cuts past a surveyed stake. Even the lower tier is double. The safe practice before any cutting near a boundary is a survey, a written agreement, or both.

Overhanging branches and encroaching roots: the self-help rule

The long-standing common-law rule is that a landowner can cut back branches and roots that cross the property line, up to the line and no farther, at their own expense, without going onto the neighbor’s land and without doing work that would kill or destabilize the tree. Portland’s Urban Forestry program points residents to exactly that rule on its “Neighbors’ trees” page, through a 2014 Arbor Age article the city hosts: trimming is allowed up to the property line, permission is not required but communication is recommended, and you may not enter the neighbor’s property or use practices that may destroy the tree.

No Oregon appellate decision squarely adopting or rejecting that rule was located for this page, so treat it as the general rule rather than a settled Oregon holding. What Oregon does settle is the downside. Cutting past the line, girdling the trunk, or taking so much of the crown or root plate that the tree dies can be the “injury” that triggers ORS 105.810, and the owner next door can seek three times the tree’s value plus fees. Two practical limits follow:

• Trim from your side, to the line, with proper cuts. On a mature Douglas fir or bigleaf maple, a one-sided crown or a severed structural root can cause a failure years later; a certified arborist can tell you how much is safe to take. See tree trimming.
• Do not expect the city to referee. Portland’s Tree Concerns page lists “neighbor’s yard tree is hanging over my property” as a problem the city will not respond to; it refers people to a private arborist.

Roots follow the same logic, with one extra caution. Roots that lift a driveway or crack a foundation are an encroachment you can address on your side, but cutting large roots within a few feet of the trunk can make the whole tree unstable. Get a written opinion first, and keep it; it is also the record you want if the tree later fails.

Trees on the property line are common property

When the trunk straddles the line, the common-law rule treats the tree as owned by both landowners together, and removal or heavy pruning needs the consent of all of them. The city-hosted Portland resource states it directly: a boundary tree is owned by all the property owners, who share responsibility for it, and pruning or removal requires consent of all the owners. Oregon cities build the same assumption into their permits. Lake Oswego’s tree removal application requires the signature of the abutting property owner if the tree is on the property line. Tigard’s permit page says the only way to settle who owns a disputed tree is to hire a professional land surveyor.

Three consequences follow. One co-owner who removes a shared tree without the other’s consent is exposed to a timber-trespass claim for the other’s share. Costs of maintenance are a matter for agreement, not a statutory formula, so put the split in writing before the work. And a city permit does not substitute for consent; in Lake Oswego it cannot be issued without it, and elsewhere a permit issued to one owner does not extinguish the other’s property interest.

If the trunk is entirely on one side and only limbs cross, it is not a boundary tree; it is that owner’s tree, and the self-help rule above applies to the limbs. Where the line actually runs is a survey question. A fence is not proof.

When a neighbor’s tree falls: negligence, not ownership

Oregon does not make a tree owner automatically liable when the tree comes down. The controlling case is Taylor v. Olsen, 282 Or 343, 578 P2d 779 (1978). A tree on Marion Olsen’s logged property in Clackamas County fell across a county road on a dark, windy January evening and Bonnie Taylor’s car hit it. The Oregon Supreme Court held that the owner’s duty is one of reasonable care in the circumstances, and it rejected a simple rule that urban owners must inspect their trees and rural owners need not. Whether an owner should have inspected depends on the use of the land, the use of the road, traffic, and whether the owner’s own activities had changed natural conditions, which is usually a question for a jury. Reasonable inspection does not require drilling or chopping into a trunk to find hidden decay unless there was reason to suspect it. Because the rot in that tree was internal and could not have been found by ordinary inspection, judgment for the owner was affirmed.

For a homeowner the rule cuts both ways. If your neighbor’s healthy-looking fir blows over in a windstorm and lands on your garage, the neighbor is generally not liable, and the Oregon Division of Financial Regulation says to file the claim with your own insurer even though the tree was rooted next door. If the tree was visibly dead, had a known fungal conk at the base, had been the subject of your written warning, or had been inspected and flagged by an arborist, the picture changes: the owner knew or should have known, and a negligence claim can succeed. That is why written notice matters, and why a tree risk assessment on a worrying tree is worth its fee whether the tree is yours or theirs.

Who pays for cleanup, what a policy covers, and what the adjuster needs from the tree service are covered in storm-damaged trees and homeowners insurance in Oregon. If a tree is down on a structure right now, start with fallen tree removal.

Views and sunlight: no general right in Oregon

Oregon gives a homeowner no general right to a view across a neighbor’s land, and no right to sunlight unless one was created on paper. A solar energy easement exists only if it is created by a written instrument that describes both properties and the protected sky space and is recorded in both chains of title (ORS 105.895); once created it runs with the land (ORS 105.890). What the Legislature did do is void any deed provision that prohibits solar energy systems outright (ORS 105.880). Nothing in that scheme makes a neighbor cut a tree so your panels get more sun; you negotiate and record an easement, or you do not have one.

City tree codes push the other way. Lake Oswego will not approve a Type II tree removal “for the sole purpose of providing or enhancing views” (LOC 55.02.080.4), and its application form asks the question outright. Portland’s Scenic Resource Zone (PCC 33.480) is the one place in the metro where views win: inside mapped view corridors a height limit applies to vegetation as well as buildings, and removal of trees or limbs needed to maintain the corridor is allowed (33.480.040.A.2.a), while in scenic corridors trees of 6 inches and larger must generally be kept. Those overlays apply to specific mapped sites, not to a view from your deck.

Private covenants can fill the gap. A homeowners association’s CC&Rs can set tree-height or view-maintenance rules that bind every lot in the subdivision, and they are enforced as contracts between owners, so read the recorded declaration before buying on a hillside lot in West Linn or Happy Valley. Absent a covenant, an easement, or a scenic overlay, the neighbor can let the trees grow.

What to do, step by step

Most tree disputes in Oregon end with a conversation and a shared invoice. When they do not, the sequence below builds the record a mediator, an insurer or a judge will ask for.

1. Document before you act. Photograph the tree, the trunk at the line, the branches or roots that cross, and any damage, with dates. Note what you can see from your side: dead tops, fungal brackets, cracks, lean, heaving soil. Keep every text and email.
2. Find the line. If the trunk is near the boundary, a licensed surveyor’s stakes settle ownership; Tigard’s permit office says nothing else does. The survey is cheap compared with a treble-damages claim.
3. Send written notice. A dated letter, sent by certified mail and kept with the receipt, telling the neighbor what you have observed and asking them to have the tree assessed. Nothing in Oregon law requires this, but it is what later converts “nobody knew” into “they were told”, which is the knowledge element Taylor v. Olsen turns on.
4. Get an arborist’s report. A written assessment from an ISA-certified arborist, ideally with the Tree Risk Assessment Qualification, that rates the likelihood of failure and names the targets. Lake Oswego’s hazard permit already requires that form; it is persuasive everywhere else.
5. Check the permit rules. In Portland any private tree of 12 inches needs a permit, in Lake Oswego and Milwaukie 6 inches, and a dead or dangerous tree gets the faster Type A track. Cutting a regulated tree without a permit adds city penalties to the private dispute. See tree removal permits in Oregon.
6. Try mediation. Resolutions Northwest runs a neighborhood mediation program for Portland residents; Tigard’s permit page refers residents to a dispute resolution center for hazard-tree disputes, and other counties have community dispute resolution centers. Mediation is confidential and produces a signed agreement you can hold each other to.
7. Small claims for damage up to $10,000. Oregon’s small claims department takes money claims up to $10,000 (ORS 46.405). The filing fee is $57 for claims of $2,500 or less and $102 above that (ORS 46.570). The defendant has 14 days after service to pay, or to demand a hearing (ORS 46.455), and lawyers appear only with the judge’s consent (ORS 46.415). Removal invoices, repair estimates and the arborist’s report are the exhibits.
8. Circuit court for treble damages. A timber-trespass claim on a mature tree is usually worth more than $10,000 once tripled, and 105.810(2) lets the court award attorney fees, which makes the case worth a lawyer’s time. Oregon’s negligence statute of limitations and the pleading rules for fees under 105.810 are traps for a self-represented plaintiff, so get advice early.

If you hire the work out

Whoever cuts near a line is the person most exposed to ORS 105.810, so the crew you hire should see the survey stakes and the written consent before a saw starts. Any business that removes or prunes trees, removes limbs or stumps, or guys a tree in Oregon must hold a CCB license (ORS 701.005(5)(e)) or an LCB license (ORS 671.525(5)(b)(D)); the license lookup guide shows how to confirm either in a few minutes, including how to read the bond and insurance lines. Put the scope in writing: which limbs, to what point, from whose side, and who hauls the debris. For a removal that both owners have agreed to, a single contract signed by both avoids the argument later about who authorized what; costs are covered in tree removal cost and the process in tree removal.