Tree and Hedge Disputes in Ontario: Boundary Trees, Overhanging Branches, and the Law

Few neighbour conflicts generate as much heat as disputes over trees and hedges. Maybe a towering maple drops leaves and seeds into your yard. Maybe a hedge has crept six inches onto your side of the line. Maybe your neighbour wants to cut down a tree whose trunk sits exactly on the boundary — and you love that tree. These disputes are emotionally charged and legally nuanced, because the ownership of a tree, and the right to cut it, depends on exactly where the tree sits relative to the property line.

Ontario law addresses boundary trees through a combination of common law principles and, for trees that fall squarely on the line, specific statutory protection. Understanding the framework can save you a trip to court — or tell you when court is exactly where you need to go.

The Boundary Trees Act: Ontario's Statutory Framework

Ontario's Boundary Trees Act applies specifically to trees whose trunks straddle the property line — sometimes called "boundary trees" or "line trees." The key principles under the Act are:

• Co-ownership: A boundary tree is jointly owned by the owners of both adjoining properties.
• No unilateral cutting: Neither neighbour can destroy or injure a boundary tree without the consent of the other.
• Dispute resolution: If neighbours cannot agree about a boundary tree, either party can apply to a judge of the Ontario Court of Justice or, in some cases, a local authority for an order.

The Boundary Trees Act is distinct from municipal tree by-laws, which may impose their own permit requirements for removing trees — even entirely on your own land. Always check your municipality's tree by-law before cutting.

Trees Clearly on One Property vs. Boundary Trees

The Boundary Trees Act applies only where the trunk straddles the line. The positioning matters:

If you are unsure where the trunk sits, a survey will tell you. The cost of a survey is almost always less than the cost of a dispute.

Overhanging Branches and Encroaching Roots

Even where a tree belongs entirely to the neighbour, its branches and roots may extend over or under your land — creating separate legal issues.

The Common Law Right to Trim

At common law, a property owner has the right to trim branches and roots that cross the property line — up to the lot line. You may cut them back, but you generally cannot go further than the line, and (in most jurisdictions) you are expected to return the trimmed material to the tree's owner.

You do not have a right to enter your neighbour's property to trim, and you cannot demand that the neighbour cut the tree simply because branches overhang.

Nuisance Claims for Tree Damage

If overhanging branches cause damage — by dropping limbs, blocking gutters, destroying a roof — the affected neighbour may have a nuisance claim against the tree owner. To succeed, you generally need to show:

• The interference is substantial and unreasonable (not just inconvenient).
• The tree owner knew or ought to have known the tree posed a risk.
• The damage resulted from that risk.

A dead or structurally compromised tree that the owner refuses to remove presents the strongest nuisance case.

Hedges and Privacy Screens

Hedges that straddle the property line are treated similarly to boundary trees — both neighbours have ownership interests and neither can unilaterally remove them. A hedge entirely on one side of the line belongs to that owner, but must not be allowed to encroach.

Hedge disputes often arise over:

• Height: Excessive hedge height blocking light. Ontario common law does not give a general right to light (unlike some other jurisdictions), but municipal by-laws may regulate hedge heights.
• Encroachment: A hedge that has grown across the line over years. The encroaching portion can be trimmed at the line.
• Removal: One neighbour wants the hedge gone; the other prizes it for privacy. If it is a boundary tree or hedge, removal requires consent or a court order.

Municipal By-Laws: An Overlay You Cannot Ignore

Most Ontario municipalities have tree protection by-laws that:

• Require permits to remove trees above a certain diameter (as of writing — verify your municipality's current threshold).
• May protect specific species regardless of ownership.
• Can impose fines for unauthorized removal.

These by-laws operate alongside — and sometimes override — the common law and the Boundary Trees Act. Before cutting any tree near a boundary, check with your municipality.

When to Call a Lawyer

Consider getting legal advice when:

• Your neighbour has cut or damaged a boundary tree without your consent.
• You want to remove a boundary tree and the neighbour refuses.
• A tree on your neighbour's land has damaged your property and they are unresponsive.
• You are receiving municipal notices about tree removal.

A lawyer can assess whether a court order is warranted, draft a demand letter, and represent you in the Ontario Court of Justice or Small Claims Court depending on the amount in dispute.

Frequently asked questions