Neighbour's Tree Overhanging Your Property in NSW: What You Can (and Can't) Do

A neighbour's tree overhanging your property is one of the most common tree-related problems we deal with on the Northern Beaches — and also one of the most misunderstood. Most homeowners know they have some right to deal with overhanging branches, but the specifics matter enormously here: the legal framework is more nuanced than most guides let on, Northern Beaches Council's tree protection rules apply even on your own side of the fence, and getting it wrong can mean a significant fine or a damaged relationship with a neighbour that lasts for years.

This guide covers exactly what NSW law allows, what you can't do without a permit or court order, which trees most commonly cause problems on the Northern Beaches, and the practical role a qualified arborist plays — from a straightforward pruning job to preparing evidence for the Land and Environment Court.

What NSW Law Actually Says

The key legislation is the Trees (Disputes Between Neighbours) Act 2006 (NSW), which establishes the legal framework for resolving tree disputes between private landowners. It covers two distinct situations:

• Trees causing damage or injury: If a neighbour's tree has caused, is causing, or is likely to cause damage to your property or injury to a person on your land, you can apply to the NSW Land and Environment Court for an order requiring the tree owner to carry out work or pay compensation.
• Trees severely obstructing sunlight or views: Under Part 2A of the Act, you may also apply where a tree severely obstructs your enjoyment of sunlight or a view — though the threshold for "severe" is deliberately high, and the court must balance the amenity value of the tree against the impact on you.

Crucially, Northern Beaches Council cannot act as a referee in a dispute between neighbours. The council's role is limited to enforcing its own permit and tree protection rules — it does not have authority to order a private landowner to deal with their tree on your behalf. If your neighbour refuses to act, the Land and Environment Court is the only authority that can order them to do so.

Your Self-Help Rights — What You Can Do Without Asking

NSW common law gives you a "self-help" right to prune branches (and roots) that encroach over your property boundary, without needing your neighbour's permission or a court order. But this right comes with important conditions:

• You can only prune back to the boundary. You cannot cross onto your neighbour's land without their permission, even to make the job safer or easier.
• You pay for it. The cost of self-help pruning is yours unless the court orders otherwise.
• The cut material belongs to the tree owner. You must offer the branches back to your neighbour. You cannot keep the timber or compost it without their agreement.
• You must not damage the tree. Your pruning must not cause unreasonable damage to the long-term health or structure of the tree. This is where things can go wrong quickly if someone with a chainsaw and good intentions removes too much in the wrong places.

In practice, self-help pruning should always be carried out by a qualified arborist working to AS 4373-2007 (Pruning of Amenity Trees). A professional will make clean cuts at the right points, avoid leaving stubs that invite disease, and won't inadvertently destabilise the tree — which would expose you to liability.

The Permit Trap Most Homeowners Don't Know About

Here is the piece of the puzzle that catches people out on the Northern Beaches: even self-help pruning requires a council permit if the tree is protected under Northern Beaches Council's Development Control Plan (DCP).

Northern Beaches Council protects trees above certain size thresholds — broadly, any tree with a trunk circumference of 100 cm or more measured at 1 metre above ground, any tree over 5 metres in height in certain situations, and any species on the council's significant tree register regardless of size. Many of the large Angophoras, Sydney Blue Gums, brush box trees and paperbarks that commonly cause boundary disputes on the Northern Beaches fall comfortably within these criteria.

Removing even a single significant branch from a protected tree — on your side of the fence, from your own property — without the required permit can result in a fine of up to $1.1 million for a corporation or $110,000 for an individual under the Local Land Services Act and Environmental Planning and Assessment Act. The council takes tree protection seriously, and it does not matter that the tree belongs to your neighbour.

Before any pruning takes place, check the tree's status. Our Northern Beaches council tree permit guide explains how the exemptions work and what triggers a permit requirement. Alternatively, read our detailed blog post on when you need a permit to remove or prune a tree on the Northern Beaches.

Trees That Commonly Cause Boundary Disputes on the Northern Beaches

Not all neighbour tree disputes are equal. Some trees cause overhanging problems easily resolved with a single annual prune; others are species with growth habits that make boundary management genuinely difficult, or have such high heritage significance that substantial pruning is off the table regardless of inconvenience.

Tree	Common problem	Usually protected?
Angophora costata (Sydney Red Gum)	Wide canopy overhang, limb drop, leaf and bark litter	Almost always — significant size and listed species
Sydney Blue Gum (Eucalyptus saligna)	Tall canopy, overhanging branches, leaf drop into pools	Usually yes above minimum size
Brush Box (Lophostemon confertus)	Dense shading canopy, bark drop, root intrusion near paths	Often — common street and garden tree, frequently large
Cocos palm (Syagrus romanzoffiana)	Fronds over fence, fruit mess, nesting rats, fruit bats	Generally not — weed species, usually exempt
Paperbark (Melaleuca quinquenervia)	Spreading canopy, bark debris, roots in drainage	Often protected at significant size
Moreton Bay Fig (Ficus macrophylla)	Enormous canopy, aggressive surface roots, structural damage	Almost always — usually heritage-significant trees

For context on how big and deep-rooted the most common Northern Beaches native trees can grow — and what their canopy spread typically means for neighbouring properties — see our guide to common trees on the Northern Beaches and how to care for them.

What a Qualified Arborist Can Do

Most people think of an arborist as someone who climbs trees and cuts branches. In a boundary dispute context, the role is considerably broader — and having a qualified arborist involved early often prevents disputes from escalating at all.

Assessment and Documentation

A qualified arborist can assess the overhanging tree objectively: its species, size, health, structural condition, proximity to structures, and the appropriate pruning response. This assessment can be written up as a formal arborist report — which you may need if you're pursuing a council permit application, lodging a formal dispute, or simply want a professional record that a risk was identified and communicated to the tree owner.

Permit Application Support

If the tree is protected and pruning requires council approval, an arborist can prepare the tree management plan and supporting documentation for the permit application, giving it the best chance of being approved in a reasonable timeframe.

The Actual Pruning Work

Where work is approved, a certified arborist will carry out the pruning to Australian Standard AS 4373-2007 — using proper pruning cuts at branch collars, removing the correct amount of canopy without destabilising the tree, and leaving the tree in better structural condition than a back-yard cleanup job would. This protects you legally and ensures the tree isn't damaged in a way that creates future liability.

Communication With the Neighbour

Sometimes having an independent professional involved shifts the dynamic entirely. Many boundary disputes we've been called to have been resolved after an arborist visited, spoke with both parties, and explained what was feasible, what was protected, and what the reasonable course of action looked like. A third-party professional opinion often de-escalates a situation that direct conversations have inflamed.

The Land and Environment Court Path

If your neighbour refuses to engage and informal resolution has failed, the NSW Land and Environment Court is the formal pathway. Here's what that process actually involves:

1. Document the problem. Photographs, dates, any written correspondence with your neighbour, and a professional arborist report documenting the tree's condition and the risk it poses.
2. Attempt mediation. The Act requires you to make a genuine attempt to resolve the issue directly with your neighbour before the court will hear the matter. Keep written records of these attempts.
3. Lodge an application. Applications are made to the Land and Environment Court's Class 2 jurisdiction. There is a filing fee. The court will list the matter for an on-site inspection.
4. Court-appointed arborist inspection. The court typically appoints its own arborist or relies on the arborist reports submitted by both parties. This is why having a credible, detailed report prepared by a qualified arborist is essential — the court's decision will be heavily influenced by the professional evidence before it.
5. The order. If the court finds in your favour, it can order the tree owner to carry out specific work, or order them to pay for work you arrange, or in extreme cases order removal.

The court process is not quick. Most applications take several months from lodgement to hearing. If a tree poses an immediate risk to life or property — not just an inconvenience — and your neighbour is uncontactable or unresponsive, the appropriate step is to call an arborist and then contact emergency services if warranted. Our emergency tree work service is available when a tree presents an urgent risk.

Liability — Who Pays If a Branch Falls?

This is the question most homeowners have but rarely ask directly. In NSW, a tree owner is not automatically liable for every branch that falls from their tree — the legal test is negligence. To succeed in a negligence claim, you need to show that the tree owner knew (or ought to have known) that the tree was dangerous, and failed to take reasonable steps to address it.

This is why creating a paper trail matters so much. If you've written to your neighbour documenting a tree health concern — better yet, had a qualified arborist produce a written report identifying structural problems and recommending action — and your neighbour has failed to act on it, the evidence of negligence is clear. Without that documentation, "I told them about it" is hard to prove after the fact.

If you're concerned a neighbour's tree is structurally compromised and could fail, read our guide to how to tell if a tree is dangerous — the same signs that make a tree on your own land hazardous apply equally to trees across the fence.

Your own home insurance may cover damage caused by a neighbour's tree, but insurers will often seek to recover costs from the tree owner. Having documented the risk ahead of time strengthens that claim.

A Practical Step-by-Step Guide

If you're dealing with a neighbour's overhanging tree right now, here is the sequence that produces the best outcomes:

1. Confirm the tree is on the neighbour's land — not straddling the boundary, not on council land. A straddling tree is jointly owned and requires a different approach.
2. Check whether it's a protected tree under Northern Beaches Council's DCP before doing anything. Even casual pruning of a protected tree is a council permit matter.
3. Have a direct, calm conversation with your neighbour first. Many disputes end here. Be specific about what the problem is and what outcome you're looking for.
4. If the tree is potentially dangerous, call a qualified arborist for an assessment before doing anything else. If there's a structural risk, you want that documented in writing and the neighbour made aware of it formally.
5. Apply for a permit if pruning is the solution and the tree is protected. Your arborist can help prepare the application.
6. Arrange the work with your arborist. For straightforward overhanging branch removal, most jobs take half a day and are far less disruptive than a disputed relationship with the people next door.
7. If your neighbour refuses to cooperate and the tree poses a genuine risk or is causing damage, engage a solicitor and the Land and Environment Court process. Your arborist report is your primary evidence.

Key Northern Beaches Suburbs Where This Comes Up Most

Neighbour tree disputes are most common in established suburbs with mature tree canopy and smaller block sizes — exactly the profile of much of the Northern Beaches. Suburbs like Manly, Collaroy and Dee Why have some of the densest residential tree cover on the Beaches, and the combination of large heritage-listed trees and closely packed properties means boundary issues are a fact of life. In leafier suburbs further north — Avalon, Bilgola, Bayview, and the Pittwater fringe — the trees tend to be larger and more protected, which makes professional management even more important.

Wherever you are on the Northern Beaches, the fundamentals are the same: check what's protected, talk to your neighbour, get a qualified arborist involved early, and document everything.

Frequently Asked Questions