Tree Removal Permits: When You Need One and Why

Tree rules are the area of yard regulation where owners are most often surprised, because the trigger is usually the tree itself rather than what you plan to do. You can be fully entitled to build a shed and still be prohibited from removing the tree in the way. The rules attach to species, to trunk size, and sometimes to the mere fact that the tree existed before the lot was developed.

Three different reasons a tree gets protected

Tree ordinances protect trees for reasons that have nothing to do with each other, and the reason determines what you have to prove to remove one.

Heritage or specimen trees — individually designated, sometimes by name and location, with removal effectively prohibited absent a safety finding.
Size thresholds — any tree of a given trunk diameter of a listed species, with the threshold commonly measured in inches of diameter at breast height.
Land-disturbance rules — trees inside a protected root zone, a stream buffer or a steep slope, protected because of what is around them rather than the tree itself.

A single property can be subject to all three at once. Establishing which ones apply is the first hour of work on any tree question.

How the size threshold is actually measured

Where a size triggers protection, the measurement is normally diameter at breast height, taken at a fixed height above grade on the uphill side of a sloping trunk. Multi-trunk trees are handled inconsistently: some jurisdictions measure the largest single trunk, others use a formula combining them.

This matters because a tree that looks clearly below the threshold on one method can be clearly above it on another. Ask which method your jurisdiction uses before you conclude that a tree is unprotected.

The measurement is also taken on the tree as it stands, not as it was planted, and it applies per tree rather than per property. Removing three trees under the threshold is usually fine; removing one over it is not.

The grounds on which removal is usually granted

Protected-tree ordinances rarely prohibit removal outright. They require a permit, and they approve it for a recognisable set of reasons.

The tree is dead, dying or hazardous, typically evidenced by an arborist report rather than by photographs.
The tree is causing or imminently likely to cause damage to a structure, a utility or a foundation.
The tree conflicts with an approved development proposal that has already completed review — not with a project you intend to propose.
The tree is a prohibited or invasive species, which are frequently exempt from protection altogether.
Pruning rather than removal is the alternative, and many applications are approved conditionally with a pruning requirement instead.

The sequencing is the substance of the rule. If the tree stands where you intend to build, the tree question has to be resolved before the building proposal is finalised, not after the plans are approved.

What the permit obliges you to do

Approval to remove usually comes with conditions, and they can be more expensive than the removal itself.

Replacement planting, often at a set ratio of caliper inches or tree count, sometimes on a schedule.
Payment into a municipal tree fund where replanting on the lot is impractical.
Protection of neighbouring trees during construction, with fencing at the dripline and penalties for damage.
A defined removal window, sometimes seasonal, to avoid nesting birds or to fit an inspection schedule.
Posting of the permit on site before work begins, and an inspection afterwards.

Trees you generally can deal with

Not every tree question is a permit question. Most ordinances address protected trees only, and the ordinary work of maintaining a yard falls outside them.

Routine pruning below whatever threshold the ordinance sets, commonly expressed as a percentage of the crown.
Removal of trees below the size threshold and outside any protected zone.
Emergency removal of a tree that has already failed or is immediately dangerous, usually with a requirement to notify the city and document the condition afterwards.
Work on trees that a utility is responsible for, which is handled through the utility rather than the city.

Emergency provisions are narrower than they sound. "It might come down in a storm" is not usually an emergency; a tree that has split and is leaning on a structure is. Photograph the condition and the surrounding damage before and after.

Neighbour trees and overhanging branches

The common-law position in most of North America is that a landowner may trim branches and roots that cross onto their own property, up to the line, provided the work does not kill or materially damage the tree. That self-help right and the local tree ordinance are separate things, and the ordinance can restrict it where the tree is protected.

Where a protected tree stands on the neighbour’s land, trimming it yourself may put you in violation of an ordinance you had no reason to think applied to you. Confirm the tree’s status before cutting anything that is not clearly yours.

Take this to your department

Ask whether the jurisdiction maintains a protected or heritage tree list, and get a copy.
Ask for the size threshold and exactly how diameter is measured, including the rule for multi-trunk trees.
Confirm whether the tree sits in a stream buffer, steep-slope area or protected root zone.
Ask what documentation is required for a hazard claim — usually an arborist report, not photographs.
Ask whether the tree must be assessed before the building plans are finalised.
Get the replacement ratio and whether payment into a tree fund is an option.
Ask about the removal window and whether it is seasonal.
Ask what protection neighbouring trees require during construction.
Confirm the self-help trimming rule for overhanging branches, and whether it is limited for protected trees.

Trees Fence Deck & patio

For the rules that apply to a specific project, use the yard rules checker or the permit threshold screener.

Frequently asked questions

Do I need a permit to remove a tree in my own yard?

It depends on the tree rather than on the ownership. Many jurisdictions protect trees by species, by trunk diameter, or by location within a buffer or steep slope, and exempt everything else. Ask whether there is a protected-tree list and what the size threshold is.

The tree is hazardous. Is that enough?

Hazard is the most common ground for approval, but it usually has to be documented by a qualified arborist rather than asserted. An imminent failure — a split trunk leaning on a structure — may qualify for emergency removal, with notice to the city afterwards.

Can I make my neighbour cut down a dangerous tree?

Generally no, unless the tree is protected or there is a local nuisance provision that applies. You can usually trim what overhangs your own property up to the line, provided you do not kill the tree. Confirm the tree’s protected status first.

What does replacing a removed tree involve?

Commonly a replacement ratio expressed in caliper inches or in tree count, planted on the lot. Where replanting on the lot is impractical, many jurisdictions allow payment into a municipal tree fund instead. Ask for both figures.

ZoneFig provides general reference information, not legal advice. Yard and zoning rules are adopted locally, so the only binding answer for your address comes from your city, town or county planning and building department. Typical thresholds shown here describe patterns across many jurisdictions and are not the rule at any specific property.