Who Is Liable When a Tree Falls on a Neighbour's Property

When a healthy tree comes down in a storm and lands next door, the neighbour's own insurance usually pays for the damage, because nobody could have prevented it. When the tree was dead, decayed or visibly leaning and the owner did nothing, the owner of the tree is often the one held responsible. For landlords, property managers and realtors, the question that decides most cases is simple: was the problem visible, and was anything done about it?

This article explains the general rules in Quebec, Ontario and the United States. It is general information, not legal advice. The exact outcome of a claim depends on the facts, the wording of each insurance policy and local law, so talk to your insurer or a lawyer about a specific case.

The principle almost every jurisdiction shares

Across Canada and the US, tree liability turns on foreseeability. Owners are expected to take reasonable care of the trees on their land. They are not expected to predict every windstorm.

That leads to two very different situations:

• A sound tree fails in severe weather. Ice storms, derechos and hurricane-force gusts bring down healthy trees. Courts and insurers usually treat this as an event no reasonable owner could have prevented, and each property's insurer handles its own damage.
• A defective tree fails. A dead ash, a maple with a hollow trunk, a spruce leaning further every year or a limb with a crack across it are warning signs. If an owner knew, or reasonably should have known, and left the tree in place, a neighbour's insurer may pursue that owner for the cost.

"Should have known" is what catches landlords: a tenant's complaint or an inspection report can later show the owner had notice.

Quebec: the custodian of a thing

Quebec applies the Civil Code rather than common law. Article 1465 makes the custodian of a thing responsible for injury caused by the thing's autonomous act, unless the custodian proves they were not at fault. A tree that falls on its own is generally treated as that kind of event, which shifts the burden onto the owner to show reasonable care.

A Quebec owner is in a far stronger position with records: a recent inspection, a pruning invoice, or proof that an exceptional storm caused the fall.

Article 985 is the other rule property owners run into. If branches or roots from a neighbour's tree extend onto a property and seriously obstruct its use, the owner can ask the neighbour to cut them and, if the neighbour refuses, can seek a court order. Unlike many US states, Quebec does not give a general right to simply cut the neighbour's branches without asking.

Montréal and most Quebec municipalities also require a permit (often called a certificat d'autorisation) to cut down many trees on private land, so even a removal ordered for safety reasons usually goes through the borough or city first.

Ontario: negligence and boundary trees

Ontario follows common law negligence. A neighbour claiming against a tree owner generally has to show the owner knew or ought to have known about a defect and failed to act reasonably. Healthy trees felled by extreme weather rarely lead to successful claims against the owner.

Ontario adds one rule that matters for rental properties on tight lots. Under section 10 of the Forestry Act, a tree whose trunk grows across the property line is the common property of both owners, and injuring or destroying a boundary tree without the other owner's consent is an offence. A landlord cannot remove a shared tree on their own, even if it worries them. Get the neighbour's written consent, and check the municipal private tree bylaw, since Toronto, Ottawa and many other cities protect trees above a set trunk diameter.

Overhanging branches can usually be trimmed back to the boundary, as long as the tree is not killed or seriously damaged.

United States: the common law pattern

US rules vary by state, but most follow the same structure:

• Act of God. A healthy tree that fails in a storm is usually not the owner's fault. Each owner's homeowners or commercial property policy pays for damage on its own side, subject to the deductible.
• Negligence. If the tree was dead, diseased or obviously hazardous, the owner may be liable. Some states hold owners to a higher standard in urban areas, where inspecting trees is considered reasonable, than in rural woodland.
• Self-help trimming. Many states let a neighbour cut overhanging branches back to the property line at their own cost, without entering the other property and without killing the tree. Several states, including California, Oregon and Washington, have timber trespass statutes that allow double or triple damages when someone wrongfully cuts or kills another person's tree.

What insurance usually covers

Policies differ, so treat this as a starting point to check against your own wording:

• Tree lands on a structure. Damage to a covered building or fence is generally covered by the policy of the property where it landed, whoever owned the tree. Removing the tree from the structure is often included, sometimes with a limit.
• Tree lands in the yard and hits nothing. Removal is often not covered, or only up to a small limit.
• Neglect. If the insurer of the damaged property believes the tree owner was negligent, it may pay its own client and then claim against the owner (subrogation). That claim then falls on the tree owner's liability coverage.

Landlords should also look at the lease. Many leases make the owner responsible for trees and the tenant responsible for reporting hazards. A tenant who reported a cracked limb in writing has created a record the owner will want to have acted on.

How landlords and property managers reduce exposure

A few habits help:

1. Walk the property at least once a year, ideally with leaves on and again after leaf drop. Note dead branches, fungus at the base, cracks, cavities and any lean that has changed.
2. Get a hazard tree assessment for any tree near a neighbour's building, a parking area or the line. A written opinion to monitor, prune, cable or remove shows reasonable care.
3. Act on what is found. Pruning dead wood, reducing a heavy limb over the neighbour's roof, or cabling a weak fork costs far less than a claim.
4. Keep records: photos with dates, invoices, assessment reports and any correspondence with tenants or neighbours.
5. Talk to the neighbour before work on a shared or overhanging tree, and get consent in writing where a boundary tree is involved.
6. Check the permit rules before removing anything. A safety removal done without a required permit can bring a fine on top of the original problem.

For realtors, the same list works as a pre-listing check.

Frequently asked questions

Who pays if a healthy tree from a rental property falls on the neighbour's house in a storm?

Usually the neighbour's own property insurer, subject to their deductible. A healthy tree that fails in severe weather is generally treated as an event the owner could not have prevented.

Can a neighbour force a landlord to remove a tree that looks dangerous?

They can ask, and if the tree is clearly hazardous and nothing is done, the owner's liability risk rises sharply if it later fails. In Quebec, a neighbour can also seek a court order under article 985 when branches or roots seriously obstruct the use of their land. In most places the neighbour cannot cut down the tree themselves.

Is a tree on the property line the responsibility of both owners?

In Ontario, a tree whose trunk grows on the boundary is the common property of both owners under the Forestry Act, so decisions about removal need both owners' consent. Many US states treat boundary trees the same way. Costs are often shared, but that is a matter of agreement between the owners.

Does documenting tree inspections really help with liability?

Yes. The key question in most claims is whether the owner knew or should have known about a defect. Dated inspection notes, an arborist's written opinion and invoices for recommended work show reasonable care and can make a large difference if a tree fails.

Get a written opinion on a tree that worries you

If a tree on a rental, condo or listing property leans toward the neighbours, has dead limbs over the line or shows decay at the base, send the details through our quote form. Include the address, roughly how tall it is and what it could hit. A local specialist looks at the tree and gives you a written scope, whether that is pruning, cabling or removal. You can also see the coverage in the Toronto service area and the Montréal service area.