Neighbour's Dead or Leaning Tree Threatens My House in Ontario

A dead tree looming over your roof, or one that has started to lean after a few storms, is a stressful problem. It is on your neighbour's land, but if it falls it lands on yours. You may feel stuck between wanting to act and not wanting to start a fight.

This article walks through sensible first steps: confirming whose tree it is, getting a professional opinion, putting the owner on notice in writing, involving your insurer and the municipality, and knowing when to speak with a lawyer. It does not predict who would be liable after a fall, because that depends heavily on the facts.

First, work out whose tree it is

Ownership affects what you can ask for. A tree growing entirely on your neighbour's lot and a tree whose trunk sits on the line between two properties may be treated differently, and your options may differ. Check your survey or reference plan if you have one.

If you and your neighbour disagree about where the boundary runs, that dispute is not something municipal fence-viewers can resolve. The line-fence procedure deals only with fence disputes and does not decide where the boundary is, so owners must resolve boundary-location questions themselves. A land surveyor and a lawyer are the usual route if the line is truly uncertain.

Document the risk before you write

A clear record is the foundation of everything else. Photographs and a written professional opinion give you something concrete to show the owner, which is more useful than a general statement that the tree looks unsafe.

• Take dated photos of the whole tree, the trunk, any lean, dead branches, fungus, cracks or lifted soil at the base.
• Photograph the tree from your property to show how close it is to the house, garage or power lines.
• Hire a qualified arborist to inspect it from your side and give you a written report.
• Note recent storms or changes you have seen and when you first noticed them.
• Keep copies of everything in one folder.

Put the owner on notice in writing

Start with a friendly conversation if you get along. Then follow up in writing, whatever the response. A short, calm letter or email that is easy to prove you sent can later show that the owner knew about the problem.

• Identify the tree and say where it is.
• Describe what you have observed and attach the photos and the arborist's report.
• Say clearly that you are concerned it may fall on your property and ask the owner to have it inspected or removed.
• Set a reasonable date for a response.
• Keep a copy and proof of delivery, such as a registered mail receipt or a dated email.

Keep the tone factual. Letters that threaten or accuse tend to make a neighbour defensive and rarely speed things up.

Involve your insurer and the municipality

Tell your home insurer about the risk and ask what your policy covers if a tree does fall, including any deductible and how a claim would work. Do this before there is damage, so you understand your position.

Many municipalities regulate the cutting or removal of larger or protected trees, and rules and permit processes vary by city. If the owner agrees to remove the tree, they should check the local by-law first. What your city can do about a tree that looks hazardous depends on the municipality, so it is worth confirming with a lawyer or your city.

If nothing happens: what to do next

If the owner ignores you, resist the urge to cut the tree or trim heavily on your own. Cutting into a neighbour's tree can create its own legal problems, and the rules for branches, roots and boundary trees are worth confirming with a lawyer before you act.

Whether the owner would be responsible if the tree falls depends on your situation, so it is worth confirming with a lawyer. A lawyer can review your records and explain your options, which may include a stronger demand letter or, in some cases, a court application. Keep your insurer informed throughout.

Frequently asked questions