The Boundary Oak: Who Owns a Tree That Grows on the Line

The situation

Abdi had spent thirty years building and eventually selling a manufacturing business, and he and Sarah had used part of the proceeds to buy an older property in Brantford with a deep, heavily treed lot — the kind of privacy and mature landscaping that had become genuinely hard to find close to the city. The centrepiece was a red oak, well over eighty years old, growing almost exactly on the boundary with the property next door. Its trunk straddled the line; roughly two-thirds of its canopy shaded Abdi and Sarah's yard, the rest reached over the fence.

Next door lived Beth, a specialist physician who had bought the neighbouring property a few years earlier and was partway through a significant landscaping overhaul — new fencing, a rebuilt patio, and a plan to open up more sunlight for a garden bed along the shared side yard. The oak stood in the way of that plan. It dropped a heavy volume of leaves and acorns onto her new patio every fall, and its roots had begun lifting a section of the fence line.

Abdi and Sarah left for a five-week trip in the fall, the kind of extended travel retirement finally allows. While they were away, Beth arranged for a tree service to remove the oak. The crew cut it down, ground the stump, and hauled away the wood in a single day. When Abdi and Sarah came home, they found a wide gap of raw sky where the tree had stood for as long as either of them had lived there, and a fresh stump that hadn't waited for anyone's opinion.

What the law says about a shared tree

Most people assume a tree belongs to whoever's yard it happens to be standing in, and if it's near a fence, whoever owns more of it gets to decide its fate. That is not how Ontario law treats a boundary tree. Under the province's Forestry Act, a tree whose trunk grows on or across a property line is treated as the common property of both owners, regardless of how the canopy or root system happens to lean. Neither owner can cut it down, injure it, or arrange to have it removed without the other owner's consent. The rule doesn't turn on percentages of shade or which yard the roots mostly occupy — if the trunk sits on the line, the tree belongs to both properties jointly, full stop.

This surprises people on both sides of these disputes. Owners who want a shared tree gone often assume that because most of it grows on their side, or because it's causing them a genuine, ongoing nuisance, they're entitled to deal with it as they see fit. They are not. A tree jointly owned under the Forestry Act can only be removed with both owners' agreement, and a neighbour who arranges removal without that consent can be held responsible for the value of what was destroyed — not simply a gesture of goodwill, but a genuine debt.

Abdi and Sarah came to us about ten days after they returned home, still more startled than angry. They wanted to know whether they had any real claim, given that the tree had, after all, been standing on both properties. They also wanted to avoid a drawn-out fight with someone they still had to live beside. Those two goals shaped everything that followed.

There's a second layer to the Forestry Act that matters here too: even where an owner does have grounds to remove part of an overhanging branch or root growth that's causing genuine damage on their own side, that limited self-help right doesn't extend to taking the whole tree down. Trimming what crosses onto your own property is one thing; deciding the tree itself should no longer exist is another, and that decision belongs to both owners together, not one of them acting first and explaining later.

What we did

1. Confirmed the tree's status on the boundary. A land survey from Abdi and Sarah's original purchase, cross-checked against the fence line and the stump's position, showed the trunk had sat almost dead centre on the property line — comfortably within the range that makes a tree jointly owned under the Forestry Act, whatever the canopy's lean.
2. Retained an arborist to assess what had been lost. The arborist inspected the stump, measured its diameter, and estimated the tree's age at close to ninety years. Using a standard method for valuing mature trees that accounts for species, size, condition, and its contribution to the property, the arborist placed a replacement value on the oak of roughly $58,000 — the cost of what it would actually take to restore comparable canopy and privacy screening, not the price of a young sapling.
3. Had a real estate appraiser confirm the market impact. Separately, an appraiser reviewed the loss of privacy screening and curb appeal on a property assessed at just over $1.2 million and estimated the removal had reduced its market value by a further amount, bringing the total loss, between restoration cost and diminished value, to roughly $70,000.
4. Sent a demand letter before considering any court process. The letter set out the Forestry Act's treatment of boundary trees, attached both the arborist's and the appraiser's reports, and proposed a fixed compensation figure with a response deadline. It made clear that a Superior Court application was available if the matter wasn't resolved, but framed that option as a last resort rather than an opening move.
5. Kept the door open to a workable relationship. Because Abdi, Sarah, and Beth would remain neighbours regardless of the outcome, we recommended settling on compensation rather than pursuing an injunction or punitive damages, and said so plainly in the letter. The goal was a fair result they could all still live next door to.

The outcome

Beth's own lawyer reviewed the reports and advised her that the Forestry Act's treatment of boundary trees left little room to argue she'd had any right to remove the oak unilaterally, whatever share of it grew on her side. Within three weeks of the demand letter, Beth agreed to pay the full $70,000 figure, split between a lump sum and a short instalment arrangement she requested to manage the cost. No court application was ever filed.

Abdi and Sarah used part of the settlement to plant several large, semi-mature replacement trees along the boundary — not a full substitute for an eighty-year-old oak, which no amount of money can truly replace, but enough to begin rebuilding the screening they had lost. The relationship with Beth remained civil; she had, by all accounts, genuinely not realized the tree wasn't hers alone to remove, and once she understood the legal position she didn't contest it further.

The case never went before a judge, but the outcome was still a clear win: the couple recovered the full value of what they'd lost, on the strength of a documented boundary survey and two independent professional assessments, without the cost, delay, or damaged relationship that a contested court application would likely have produced.

It also illustrates something that gets lost in most conversations about neighbour disputes, which tend to assume the only options are silent resentment or a courtroom. Between those two extremes sits a well-documented demand backed by independent expert evidence, sent before positions have hardened into something neither side can walk back from. Beth's own lawyer could look at the survey, the arborist's report, and the appraisal, and tell her plainly that fighting the claim wasn't a good use of her money. That is often what actually resolves a case like this — not a hearing, but a second lawyer doing the same math and reaching the same conclusion.

What you can learn from this