Assessing Property Damage from Trees: Who Is Liable in Ontario?

Timberscapes Tree & Plant Services Crew

Trees are one of the most valued features of residential and commercial properties throughout our service areas in Georgina, York Region, Durham Region, Brock Township, and Lake Simcoe. They provide shade, improve air quality, support wildlife, and add genuine financial value to land. But when a tree causes damage to a structure, vehicle, or neighbouring property, questions of responsibility arise quickly, and the answers are not always straightforward.

At Timberscapes Tree & Plant Services, our Certified Arborists are frequently called upon to assess trees involved in property damage events. This blog provides an overview of how liability is generally approached in Ontario and what steps property owners can take to protect themselves.

Please note that this information is provided for general educational purposes. Tree liability involves legal considerations that vary by municipality, insurance policy, and individual circumstances. We encourage property owners to consult with a legal professional for advice specific to their situation.

Common Types of Tree-Related Property Damage

Property damage involving trees takes many forms. The most frequently encountered situations include:

• Falling branches or limbs damaging roofs, fences, vehicles, or neighbouring structures during storms

• Full tree failure where a tree uproots or snaps at the base and falls onto a structure or onto an adjacent property

• Root intrusion that causes damage to foundations, interlocking pavers, underground utilities, or drainage systems

• Trees or large branches falling onto shared driveways or roadways during winter ice storms, which are a regular occurrence across Ontario

The General Principle of Liability

In Ontario, liability for tree-related property damage is primarily governed by the concept of negligence. A property owner who knew, or reasonably should have known, that a tree on their property posed a risk of harm, and who failed to take reasonable action to address that risk, may be found liable when damage occurs.

The key question in most cases is whether the damage was foreseeable. A tree that was visibly decayed, had large dead branches hanging over a neighbour's property, or had been flagged as a concern by a Certified Arborist in a prior assessment is generally considered a foreseeable risk. If the owner took no action after being made aware of the hazard, liability becomes much more difficult to defend.

By contrast, if a tree fails suddenly during an exceptional weather event with no prior signs of defect or disease, the outcome may be treated differently under the law. Ontario's winters regularly bring ice storms, high winds, and heavy snow across our service areas. However, extreme weather is not automatically a shield against liability if the tree was already structurally compromised.

When a Neighbour's Tree Causes Damage to Your Property

One of the most common scenarios our Certified Arborists are called to assess is damage caused by a tree whose trunk originates on a neighbouring property. Under general Ontario property law, trees belong to the landowner on whose property the trunk is rooted.

If a neighbour's tree falls on your property, the outcome depends heavily on the condition of the tree prior to the event. If the tree showed signs of disease, decay, or structural failure that the owner should have reasonably recognized and addressed, you may have grounds to pursue a claim. If the failure occurred with no prior visible warning signs, recovery may be more difficult.

In practice, insurance is often the first avenue explored. Most homeowner insurance policies in Ontario provide some coverage for damage caused by fallen trees, though deductibles, exclusions, and coverage limits vary. Property owners are encouraged to review their policy details with their broker.

Boundary Trees and Shared Responsibility

Trees whose trunks straddle a property line are considered shared property under Ontario law, meaning both adjoining landowners may have a stake in decisions about the tree's care and removal. If a boundary tree causes damage, determining liability can involve assessing the actions or inactions of both property owners.

Our Certified Arborists are experienced in preparing written arborist reports that document tree condition, identify structural defects, and provide professional opinions that are useful in resolving boundary tree disputes without requiring litigation.

Tree Guy

Municipal Trees

In many communities across our service areas, trees are planted and maintained by the municipality along road allowances and public boulevards. If a municipally owned tree fails and causes damage to your vehicle or property, you may be able to file a claim with the municipality. However, municipalities are generally only liable if they had prior knowledge of a defect and failed to act. The process for filing such a claim is time-sensitive and typically involves specific notice requirements.

The Importance of Proactive Tree Care

The most effective way to avoid tree liability is to take a proactive approach to tree care on your property. At Timberscapes, we recommend that property owners throughout our service areas take the following steps:

• Arrange for a professional tree risk assessment with a Certified Arborist, particularly for large, mature trees located near structures, driveways, or neighbouring properties

• Keep written records of all tree inspections, maintenance work, and arborist consultations

• Act promptly on recommendations to prune, treat, or remove trees identified as hazardous

• Notify neighbours in writing if you identify a concern with a tree on their property that could affect yours, and retain a copy of that correspondence

• Consult your municipality before pruning or removing trees to ensure compliance with local tree bylaws, several of which apply across communities in our service areas

How a Certified Arborist Report Can Help

A written report prepared by a Certified Arborist provides objective documentation of a tree's condition, structural integrity, and relative risk level. These reports are valuable not only for guiding maintenance decisions but also as evidence in insurance claims and legal disputes. Our Certified Arborists at Timberscapes are trained in tree risk assessment methodology and can prepare detailed reports suitable for use in property damage investigations.

Contact Timberscapes for a Tree Risk Assessment

If you have concerns about trees on your property or a neighbouring property, do not wait for a storm to make the decision for you. Timberscapes Tree & Plant Services provides professional tree risk assessments and arborist reports to residential and commercial clients throughout Georgina, York Region, Durham Region, Brock Township, and Lake Simcoe. Contact us to schedule an assessment with a Certified Arborist.

Timberscapes Tree & Plant Services

Exceptional Arborists, Operating Above the Ordinary

905-251-7422

info@timberscapestps.com