No bylaw sets a minimum planting distance from a property line the way zoning sets a setback for a fence or a shed. No zoning or fence bylaw in Toronto sets a minimum planting distance for a new tree, including Zoning By-law 569-2013. Neither do the GTA tree bylaws we checked: Toronto Municipal Code Chapter 813, Mississauga By-law 0021-2022, Markham By-law 2023-164 and Richmond Hill By-law 19-25. Other rules decide the distance instead.
The Forestry Act Lets You Plant on the Line Itself
Ontario’s Forestry Act lets you plant right on the boundary itself, provided the neighbour agrees. Section 10(1) says an owner of land may, with the consent of the owner of adjoining land, plant trees on the boundary between the two properties.
Once a tree’s trunk grows on that boundary line, section 10(2) makes it the common property of both owners. Neither of you can remove or seriously injure it without the other’s consent. Section 10(3) makes damaging or destroying a boundary tree without consent an offence under the Act. Section 19(1) sets the penalty at up to $20,000, or up to three months in jail, or both, a steep jump from the predecessor law: the old Trees Act capped the same offence at $1,000.
A tree planted a foot inside your own line is yours alone. Plant that same tree on the line, get your neighbour’s sign-off, and it becomes joint property, which means removing it years later needs that consent all over again. If a boundary dispute has already started over an existing tree, our post on three Ontario court cases about boundary trees covers how that plays out in front of a judge.
Toronto Uses a Different Test for Whose Tree It Is
Toronto has a separate rule for maintenance, easy to confuse with the Forestry Act but built for a different question. The city’s test looks at where the trunk emerges from the ground. If more than 50 percent of the base of the trunk sits on private property, maintaining that tree is the private owner’s responsibility.
That 50-percent test answers a narrower question than section 10 does. Section 10 of the Forestry Act covers ownership and consent when a trunk straddles the line between two private lots. Toronto’s test decides who maintains a tree relative to the city-owned strip along the street, and it runs between a homeowner and the city, not between two private owners. A tree can fail the 50-percent test and never touch the Forestry Act’s boundary-tree definition at all. If you’re pulling an arborist report together for a project near a tree that isn’t clearly yours, our post on trees you don’t own showing up on your report explains why the city’s coverage area reaches past your own lot line.
The Road Allowance Isn’t Yours to Plant On
The strip of grass between the sidewalk and the curb, or between your front lot line and the street, belongs to the city, not to you. If you plant there without going through the city first, Toronto treats it as a “delegated encroachment” under Article IV of Municipal Code Chapter 743. That requires an encroachment agreement and a street work permit, and the homeowner carries the maintenance for a set period before the city takes ownership.
Toronto built an easier route. Submit a tree-planting request for the road allowance in front of your property, and city staff pick the species and the exact spot, weighing available space, soil and sunlight, what’s running underground and overhead, and any paved surfaces nearby. You do not pick the tree or the spot under that program. The city does, because it owns the strip and has to account for utilities you can’t see from your yard.
Mature Size Sets the Distance on Your Own Land
Once you’re clear of the boundary and the road allowance, no bylaw sets how far a tree must stand from your own house. The tree’s mature spread decides it, and wide species such as silver maple, bur oak or cottonwood need the most room.
A tree’s root system commonly spreads to roughly the height of the tree, which is wider than the branches suggest. Research on root pruning (Smiley, 2008) found that cuts within about three times the trunk diameter measurably reduced a tree’s stability, and arborists generally keep trenching to five times the diameter or more. Plant close to a line where a neighbour might trench for a footing later, and the root conflict is already built into the plan.
Call Before You Dig, Even for One Tree
Homeowners think of underground locates as a construction-site rule. It applies just as much to a single hole for a single tree. Ontario One Call requires a locate request at least 5 business days before you dig. The service is free.
Under Ontario Regulation 87/23, starting a dig without a locate response on file carries a set administrative penalty of $10,000, and failing to file the request at all carries $250. A regulator can add a separate penalty for each day a contravention continues, but the total per contravention is capped at $10,000, not stacking per day. Either way, a five-day wait beats digging blind into a gas line to get a tree in this weekend.
Powerlines Set Their Own Distance
Near a powerline, Toronto Hydro sets its own distances. Toronto Hydro splits the ground under and around its wires into three zones. The Low zone covers everything under the line and within 4.5 metres (15 feet) of it, where only species with a mature height and spread of 4.5 metres (15 feet) or less belong. The Medium zone runs out to 7.6 metres (25 feet) and takes species maturing at 7.6 metres (25 feet) or less. Beyond 7.6 metres you’re in the Tall zone, and any strong healthy tree is fine there.
Toronto Subsidizes Private Planting Through LEAF
The City of Toronto partners with LEAF, Local Enhancement and Appreciation of Forests, to subsidize private tree planting. A full-service option runs $160 to $230 per tree plus HST: site consultation, delivery, planting, and mulching included. A DIY option runs $110 to $180 plus HST, with a virtual consultation and the tree and mulch delivered to your door. Both options come with native stock: 5 to 8 foot deciduous trees, or 2 to 4 foot evergreens.
A Planted Tree Becomes Protected at 30 cm
That sapling you’re about to put in the ground will, decades from now, cross 30 centimetres in diameter and become protected under Chapter 813. Taking it out then needs a permit application.
If your tree ends up on a boundary line or needs a report tied to a permit application, our arborist report and tree removal services cover the documentation a city or a neighbour dispute will ask for. For a property-specific question before you plant or dig, contact us.