Tree law in Ontario starts with a question most homeowners never think about until a neighbour’s branches are dropping leaves into their gutters: who actually owns the tree. The answer depends on where the trunk sits, not where the branches reach. A tree whose trunk grows on the line between two properties belongs to both owners jointly, under a specific provincial statute. A tree whose trunk sits entirely on one side, even if its canopy hangs well over the fence, belongs to that owner alone, and the neighbour’s rights are narrower than most people assume. This guide covers who owns a boundary tree, what a homeowner can and can’t do about branches or roots crossing the line, and the separate Toronto bylaw that can require a permit before a tree comes down at all, alongside everything else in our complete Toronto real estate guide.
Who owns a tree on or near a property line
Ontario’s Forestry Act settles this directly. Under section 10, a tree whose trunk is growing on the boundary between two adjoining properties is the common property of both owners, jointly, regardless of which side the canopy leans toward or how the roots spread. Neither owner can injure or destroy a true boundary tree without the other’s consent, and doing so is itself an offence under the Act, separate from any dispute the two neighbours might have between themselves, carrying a fine of up to $20,000, up to three months in jail, or both. If the two owners can’t agree on what to do with a boundary tree, trim it, remove it, treat a disease, either one can apply to a judge of the Superior Court of Justice for an order rather than acting alone.
The test is specifically about the trunk. A tree whose trunk sits a foot inside the neighbour’s yard, even if its branches reach well over the fence and its roots run under the patio, isn’t a boundary tree under this section. It’s the neighbour’s tree, full stop, and the rules that apply are different.
This question comes up in a real estate context more often than people expect. A tree straddling a property line can affect how a lot is surveyed, whether a fence or a planned addition sits where someone assumed it did, and who’s actually responsible when a buyer or seller wants a mature tree removed before a sale closes. None of that changes the ownership test itself, but it’s the reason this comes up during a purchase or a renovation, not only when a neighbour dispute boils over on its own.
Can you cut branches or roots crossing onto your property
Yes, for a tree that isn’t a shared boundary tree, Ontario’s common law gives a property owner a self-help right to trim branches and roots that cross onto their own land, back to the property line, without asking permission or giving notice first. This right exists separately from the Forestry Act and comes from ordinary legal principles about a landowner’s control over their own property, not one single statute, and it comes with limits that are easy to assume away.
Two limits matter in practice. The trimming can’t kill the tree or leave it structurally unstable, cutting so aggressively that the whole tree dies or becomes a hazard crosses from reasonable self-help into something a neighbour could pursue as damage to their property. And the person doing the trimming can’t cross onto the neighbour’s land to do it; stepping over the line with a ladder or a saw to reach further than the boundary itself is ordinary trespass, however reasonable the reason feels. Trim to the line, from your own side, without harming the tree’s health, and the right covers you. Go past either limit and it doesn’t.
What if the tree stands entirely on the neighbour’s side
The same self-help trimming right applies, and it’s the same right in both directions: whether the tree’s trunk sits on the boundary (subject to the Forestry Act’s joint-consent rule above) or entirely on the neighbour’s own property with only branches or roots crossing over, you can trim back to your own property line without permission. What doesn’t change is the limit on removal. Owning the airspace your branch-trimming reaches into doesn’t give you any right to force the tree itself to come down, whatever side its trunk is on. A neighbour whose healthy tree genuinely bothers you, blocking light, dropping seeds, growing taller every year, has no legal obligation to remove it just because you’d prefer it gone, and nothing in Ontario law changes that simply because the branches happen to cross your fence.
Can you force a neighbour to deal with a dangerous or diseased tree
Not directly, and not automatically, but a homeowner isn’t left with no options either. Two separate routes exist, and they only apply once a tree is actually dead, diseased, or structurally compromised, not simply unwanted. Reporting a tree you believe is hazardous, through Toronto’s 311 service, can trigger a City inspection, and if the inspector finds a genuine hazard, the City can issue a compliance order requiring the owner to address it. Separately, where a visibly dead or dangerous tree the owner has refused to deal with actually causes damage, a fallen limb through a roof, root damage to a foundation, the affected neighbour may have a nuisance claim against the tree’s owner, generally strongest where the danger was obvious and nothing was done about it. Neither route exists for a tree that’s simply healthy and inconvenient; both require the tree to actually be a hazard, not just unwelcome.
Toronto’s own tree bylaw, a separate layer
Everything above is about ownership and self-help rights between neighbours. The City of Toronto adds a separate layer on top of all of it, through its Private Tree Protection By-law, Municipal Code Chapter 813. Any privately owned tree with a trunk 30 centimetres or more in diameter, measured at 1.4 metres above the ground, needs a City permit before it’s injured, destroyed, or removed, whatever the ownership question says and whatever right a homeowner might otherwise have to deal with their own tree. This applies even to a tree that’s entirely on one owner’s own property with no boundary or neighbour dispute involved at all; size, not ownership or location, is what triggers the permit requirement. Removing a protected tree without one carries a fine of $500 to $100,000 per tree. A smaller tree, under that diameter threshold, isn’t covered by this particular bylaw, though the ownership and trimming rules above still apply to it.
This is a different question from a property line encroachment, which involves a physical structure like a fence or a deck crossing a boundary, not a living tree. Where the question is where a boundary actually runs, rather than who owns what’s growing near it, our guide to land survey costs in Ontario covers when it’s worth getting a current survey to settle the line itself.
Frequently asked questions
Who owns a tree that sits on the property line between two houses in Ontario?
Under section 10 of Ontario’s Forestry Act, a tree whose trunk is growing on the boundary line between two adjoining properties is the common property of both owners jointly. This test is specifically about where the trunk sits, not how far the branches or roots spread. Neither owner can injure or destroy a genuine boundary tree without the other’s consent; doing so is itself an offence under the Act, with a fine of up to $20,000, up to three months in jail, or both, separate from any civil dispute the neighbours might also have between themselves.
Can I cut branches from my neighbour’s tree that hang over my yard in Ontario?
Yes. Ontario common law gives a property owner the right to trim branches and roots that cross onto their own land back to the property line, without needing the neighbour’s permission or giving advance notice. This self-help right has two limits: you can’t trim in a way that kills the tree or makes it structurally unstable, and you can’t cross onto the neighbour’s property to do the trimming, since stepping over the line is ordinary trespass. Stay within your own property and don’t damage the tree’s health, and the right covers you.
Can I make my neighbour remove a tree that’s entirely on their property but overhangs mine?
No, not simply because it overhangs. You have the same self-help right to trim the branches and roots crossing onto your own land back to your property line, but that right doesn’t extend to forcing removal of the tree itself, whether the trunk sits on the boundary or entirely on your neighbour’s own land. A neighbour has no legal obligation to remove a healthy tree just because you’d prefer it gone, and the fact that branches cross your fence doesn’t change that.
Can I force my neighbour to remove a dead, diseased, or dangerous tree?
Not directly, but you have two options if the tree is genuinely hazardous rather than just unwanted. Reporting it to the City of Toronto through 311 can trigger an inspection, and if an inspector confirms a hazard, the City can issue a compliance order requiring the owner to deal with it. Separately, if a visibly dead or dangerous tree the owner has refused to address actually causes damage to your property, you may have a civil nuisance claim against them. Both routes require the tree to be an actual hazard, dead, diseased, or structurally compromised, not simply healthy and inconvenient.
Do I need a permit to cut down a tree on my own property in Toronto?
Possibly, depending on its size. Toronto’s Private Tree Protection By-law, Municipal Code Chapter 813, requires a City permit before injuring, destroying, or removing any privately owned tree with a trunk 30 centimetres or more in diameter, measured at 1.4 metres above the ground, regardless of who owns the property or whether a neighbour is involved at all. Removing a protected tree without a permit carries a fine of $500 to $100,000 per tree. A smaller tree, below that threshold, isn’t covered by this specific bylaw, although the ownership rules covered earlier in this guide still apply to it.
Tree disputes between neighbours usually resolve through the self-help trimming right, a municipal inspection, or a conversation, not a lawsuit, but Toronto’s own permit rules mean size matters as much as ownership once a tree actually needs to come down. Get in touch with our team with questions about a specific property, and see our guides to property line encroachment in Ontario and land survey costs in Ontario for the boundary questions a tree dispute often runs alongside, or browse the rest of our guides.