Trees (Disputes Between Neighbours) Act 2006

The primary addressees are owners (including occupiers—s 3(1)) of neighbouring land parcels in designated urban and quasi-urban zones. An “affected land owner” may initiate proceedings under either Part 2 or Part 2A. Conversely, the owner of land on which the tree or hedge is situated is the necessary respondent and the person upon whom most obligations fall.

Because “owner of land includes the occupier”, tenants and other lawful occupiers can be both applicants and respondents. The definition is functional rather than technical; it captures whoever has day-to-day control sufficient to carry out or permit works.

Local councils and the Heritage Council are given express rights of appearance where, absent s 6(3), their consent would be required under the Environmental Planning and Assessment Act 1979 or the Heritage Act 1977 (ss 13, 14G). Councils are further empowered to carry out works in default, recover costs, register charges and enforce payment (ss 17, 17A). They therefore occupy a hybrid role: potential interveners, enforcement agents and cost-recovery creditors.

Successors in title are directly affected. An order requiring work on a tree or hedge binds an immediate successor once a copy of the order is given to them; the compliance period restarts from the date of receipt (s 16). Conversely, an immediate successor in title to an successful Part 2 applicant inherits the benefit of the order (s 16A). These provisions ensure that the Court’s orders run with the land rather than evaporating on sale.

Broader classes of persons may be swept in. Section 8(1)(c) and s 14C(1)(c) require an applicant to notify “any other person the applicant has reason to believe will be affected by the order”. That could include mortgagees, lessees, or owners of other neighbouring lots whose amenity or title would be impacted by removal of a prominent landscape tree.

Crown land is largely excluded. Part 2A expressly does not apply to trees on Crown land (s 14A(2)), and the general application provision carves out land vested in or managed by a council (s 4(2)(a)). The Act nevertheless binds the Crown in right of New South Wales and, so far as legislative power permits, in all other capacities (s 19).

Finally, the legislation affects arborists, consultants and expert witnesses. The detailed mandatory considerations in ss 12 and 14F mean that evidence going to biodiversity, soil stability, heritage value, solar geometry, leaf seasonality and view corridors is routinely required. Professional advisers who fail to alert clients to these statutory criteria risk negligence claims.

Rights of affected owners
An owner whose property is damaged or threatened by a neighbour’s tree has the right to apply for remedial, restraining or preventive orders (s 7). In hedge cases the right arises only where the obstruction is “severe” and the balancing test in s 14E(2)(b) is satisfied. Both classes of applicant enjoy a statutory entitlement to have the Court consider a structured list of factors that expressly includes the applicant’s own conduct and the contribution of the applicant’s own trees (ss 12(h)(i), 14F(m)).

Successful applicants may be authorised by the Court to enter the respondent’s land to carry out work or obtain quotations (ss 9(2)(g), 14D(2)(g)). They can also seek compensation for past damage under Part 2 (s 9(2)(i)) although not under Part 2A.

Duties of tree or hedge owners
The owner of the land on which the tree or hedge stands must be given at least 21 days’ notice of any application and of the orders sought (ss 8, 14C). If an order is made, that owner (and, after service, any successor) is under a strict duty to comply (s 15). The maximum penalty of 1,000 penalty units signals the seriousness with which Parliament views non-compliance.

Tree owners also have a statutory right to be heard on the full range of discretionary matters in ss 12 and 14F, including the tree’s contribution to privacy, heritage, biodiversity and public amenity. They may resist orders by demonstrating that the applicant’s own acts or omissions were the real cause of damage or that less intrusive solutions (such as targeted pruning) are available.

Rights and duties of consent authorities
Local councils and the Heritage Council may appear as of right where their consent would otherwise be required (ss 13, 14G). They are entitled to receive a copy of every substantive order (ss 14, 14H). Councils additionally possess enforcement powers that are independent of the original applicant: they may enter land after notice (or without notice in emergencies), carry out the ordered work, recover costs on a debt action and register the debt as a charge on the title (ss 17, 17A).

Mutual duties of neighbours
Both parties are under an implicit duty to attempt reasonable negotiation before litigation. The Court must be satisfied of a “reasonable effort to reach agreement” before it can make orders (ss 10(1)(a), 14E(1)(a)). This has been interpreted in the case law as requiring genuine attempts at mediation or direct discussion rather than perfunctory letters.

The Act also imposes a duty on applicants to notify all persons they have reason to believe will be affected (ss 8(1)(c), 14C(1)(c)). Failure to do so may result in adjournment or costs orders.

The principal sanction is criminal. Section 15(1) creates a strict-liability offence of failing to comply with any requirement imposed by an order under Part 2 or 2A. The maximum penalty of 1,000 penalty units (currently $110,000 for a natural person, five times that for a corporation) is among the highest fixed penalties in New South Wales summary jurisdiction. Proceedings are brought in the Land and Environment Court’s Class 5 jurisdiction.

Civil enforcement is equally potent. If an owner fails to comply, the council may, at the request of the original applicant, enter the land after giving written notice (or without notice in safety or urgent cases), carry out the work itself and recover reasonable costs plus a prescribed administrative charge (s 17(8)). That debt can be registered as a judgment debt and, once registered, creates a statutory charge on the land (s 17A). The charge survives changes of ownership except in limited circumstances (sale to a bona-fide purchaser without notice, or cancellation after payment). For land under the Real Property Act 1900 the charge has no effect until registered.

Successors in title are bound once they receive a copy of the order; the compliance clock restarts on the date they are served (s 16(3)). This mechanism prevents vendors from evading obligations by selling before the work is done.

The Court itself may authorise the applicant to carry out the work and recover costs from the respondent (ss 9(2)(e)–(h), 14D(2)(f)–(h)). Costs orders can include the expense of obtaining quotations and entering land.

Because the offence under s 15 is summary, enforcement is relatively swift. The combination of criminal penalty, council self-help powers and registrable charge gives the regime real teeth. In practice, the mere threat of a council works order and a charge on title is often sufficient to secure compliance.

The Act is deliberately situated within a web of planning, environmental and property statutes.

Most significantly, s 6(3) provides that an order under Part 2 or 2A has effect despite any requirement for development consent or heritage authorisation under the Environmental Planning and Assessment Act 1979 or the Heritage Act 1977. This statutory override is limited to the specific work authorised by the Court order; it does not confer a general exemption from planning controls. Subsection (1) otherwise preserves the need for any other consents that may be required.

Section 12(b) and s 14F(d) require the Court to consider whether, absent the s 6(3) override, consent would have been needed and whether it has in fact been obtained. The Court therefore still evaluates the planning merits but is not bound by refusal of consent.

The Act carves itself out of the common-law nuisance regime (s 5). This pre-emption is not total: s 18 expressly states that, except for s 5, nothing in the Act affects rights under any other Act or law to interfere with a tree not owned by the person. The note to s 18 gives examples: neighbouring-land access orders under the Access to Neighbouring Land Act 2000 for inspection or removal of dangerous trees, and electricity-operator powers under the Electricity Supply Act 1995 to trim trees interfering with power lines.

Interaction with native vegetation laws is addressed in s 12(b1), which requires the Court to consider whether interference would have required approval under the (now repealed) Native Vegetation Act 2003 but for the legislative exclusion in s 25(t) of that Act. Although that statute has been replaced, the principle of considering broader environmental approval pathways remains relevant under the “such other matters” limb of ss 12(j) and 14F(s).

The definition of “council” imports the meaning given in the Local Government Act 1993, and “Crown land” takes its meaning from the Crown Land Management Act 2016 (s 3(1)). Zone definitions are tied to environmental planning instruments made under the Environmental Planning and Assessment Act 1979 (s 4(1)(a)), with a regulation-making power to deem zones equivalent or non-equivalent (s 3(1A)).

Successor-in-title provisions interact with conveyancing and title-registration law. Registration of a s 17A charge engages the Real Property Act 1900 priority rules; the charge is subject to all prior registered interests but binds subsequent purchasers with notice.

Finally, the Act binds the Crown (s 19) but excludes Crown land from the hedge jurisdiction (s 14A(2)) and council-managed land from the entire Act (s 4(2)(a)). This produces the curious result that a private neighbour of Crown land may have no statutory remedy under this Act for a blocking hedge, though common-law or other statutory avenues may remain.

The most substantial change since enactment was the insertion of Part 2A in 2010 to deal with high-hedge disputes. Prior to that amendment the Act was confined to trees causing damage or injury. Experience demonstrated that many neighbour disputes concerned loss of amenity—particularly loss of sunlight or views—rather than physical damage. The 2010 reforms responded by creating a tailored regime with a higher threshold (“severe” obstruction), an explicit balancing test weighing the applicant’s interest against the undesirability of interference (s 14E(2)(b)), and a different menu of orders that excludes compensation.

Procedural provisions were mirrored (notice under s 14C, mandatory considerations under s 14F) but adjusted to the new subject matter: the Court must now consider whether the trees existed before the dwelling was built, whether they grew to 2.5 m during the applicant’s ownership, the number of hours of sunlight lost at different times of year, leaf seasonality, and the nature and extent of any remaining view (s 14F(b), (c), (o), (p), (q)).

Enforcement provisions were adjusted to differentiate between “original owner” and “original trees owner” (s 16(1) and (1A)), reflecting that hedge orders often require ongoing maintenance rather than one-off removal.

Subsequent amendments have been largely technical. Updates to cross-referenced statutes (for example, replacement of the Crown Lands Act 1989 with the Crown Land Management Act 2016) have been reflected in the definitions. The penalty for non-compliance remains 1,000 penalty units, signalling continued legislative commitment to strong enforcement. The review clause in s 14I required a two-year post-commencement review of Part 2A; that exercise confirmed the policy settings and led to only minor refinements rather than wholesale repeal.

The changes reflect a legislative judgment that neighbour amenity disputes deserve a low-cost, specialist forum that balances private interests against public values of urban greenery, biodiversity and heritage. By expanding the Act rather than creating a separate statute, Parliament maintained procedural consistency while recognising the distinct character of hedge disputes.

The Act has generated a substantial body of Land and Environment Court jurisprudence, much of it turning on the meaning of “likely in the near future”, “severe obstruction” and the weight to be given to the s 12 and s 14F factors.

Early challenges tested the jurisdictional gateways. In several matters respondents argued that damage caused by roots was not “as a consequence of a tree” where soil desiccation or structural defects were also at play. The Court has consistently held that the tree need only be a substantial cause; it need not be the sole cause (s 10(2) read with s 12(h)).

The phrase “likely in the near future” has been interpreted as requiring a real chance or possibility within a period of roughly 12 months, although the Court retains flexibility. Expert arboricultural evidence is almost invariably required.

Hedge litigation has been particularly contentious. Applicants frequently underestimate the “severe” threshold; the Court has emphasised that minor or seasonal reduction in light or a partially obscured view will not suffice. The balancing test in s 14E(2)(b) has produced divergent outcomes: a hedge that provides the only privacy between two tightly spaced dwellings is more likely to survive than one planted purely for spite.

Heritage and biodiversity controversies arise regularly. Where a tree is listed on a heritage register or forms part of a significant ecological corridor, the Court has on occasion refused removal even where minor structural damage is occurring, preferring root barriers or engineering solutions. Conversely, where an applicant can demonstrate that the tree’s contribution to amenity is negligible and the damage is escalating, removal has been ordered notwithstanding biodiversity objections.

Controversy also surrounds costs. Although the Court has a general costs discretion, the usual practice is that each party bears its own costs unless the proceedings were frivolous or there has been unreasonable conduct. This “no costs” presumption is designed to encourage negotiated outcomes but has been criticised by some practitioners as leaving successful applicants out of pocket for expert reports that can cost many thousands of dollars.

Procedural disputes over notice under ss 8 and 14C have led to adjourned hearings and, on occasion, costs orders against applicants who failed to notify mortgagees or other interested parties. The 2025 amendments to those sections appear directed at streamlining the Court’s power to waive or vary notice requirements.

Overall, the jurisprudence demonstrates a Court that is pragmatic, evidence-driven and conscious of the legislative purpose of providing accessible relief while protecting urban tree canopy.

Most practitioners underestimate the evidentiary burden imposed by the mandatory consideration lists. It is not enough to file an arborist’s report addressing only safety; a separate ecologist or heritage consultant may be required if the tree has ecological or cultural value. Failure to lead evidence on each relevant s 12 or s 14F factor can result in the application being dismissed even where damage is clear.

The “reasonable effort to reach agreement” precondition is more onerous than many realise. A single letter before action will rarely suffice. The Court looks for evidence of genuine negotiation—offers to share costs of pruning, mediation attendance, or proposals for alternative solutions. An applicant who records only perfunctory attempts risks jurisdictional dismissal.

Successors in title are often caught unaware. A purchaser who obtains a standard building and pest inspection may never learn of an unregistered Court order. Yet once the purchaser is given a copy of the order they become personally liable to carry out works that may cost tens of thousands of dollars. Vendors are not required to disclose such orders in a standard contract unless the order has been registered as a charge. Caveat emptor applies with a vengeance.

Hedge applicants frequently misjudge the “severe obstruction” test. The Court has rejected applications where a hedge blocks winter morning sun but permits adequate light for the rest of the day, or where a view is partially filtered rather than eliminated. The balancing test is not a simple “my amenity versus your tree” exercise; public-interest factors such as contribution to the local ecosystem are given real weight.

Council enforcement is not automatic. A successful applicant cannot simply demand that the council carry out works; the applicant must request the council to act. Councils, facing resource constraints, may decline or impose conditions. The administrative charge recoverable under s 17(8)(b) is prescribed by regulation and can add thousands to the final bill.

Finally, the interaction with planning law contains a trap. Although s 6(3) overrides the need for development consent for the specific works ordered, any additional works (for example, removal of additional trees not covered by the order) will still require consent. Applicants who obtain a Court order for removal of one tree sometimes assume they can clear the entire boundary; doing so can expose them to separate enforcement action by the council.

Compliance begins before any dispute crystallises. Property owners should maintain a watching brief on boundary trees and hedges. Regular arboricultural inspections every two to three years can identify incipient problems (root damage, canopy imbalance, disease) before they trigger statutory rights.

When a neighbour raises a concern, the prudent response is to engage early. A genuine attempt to agree—documented by correspondence, joint expert meetings or mediation—satisfies the jurisdictional precondition and often resolves the matter without litigation. Offering to share the cost of a qualified arborist report demonstrates reasonableness.

If proceedings are commenced, the respondent should file evidence addressing every mandatory consideration in s 12 or s 14F that is relevant. Retaining a consulting arborist, ecologist or heritage architect early is essential. Mere assertion that the tree is “beautiful” will not suffice; quantifiable evidence of its contribution to biodiversity, scenic value or privacy is required.

Where an order is made, strict compliance with its terms is mandatory. Time limits are strictly enforced; if works cannot be completed within the specified period, an application should be made to vary the order before the deadline expires. Failure to comply exposes the owner to prosecution, council works orders and a charge on title that can frustrate future sales.

Purchasers and their solicitors must treat tree disputes as a conveyancing risk. Standard requisitions on title should ask whether any application has been made or order made under the Act. A copy of any order should be obtained and served on the purchaser at settlement so that the time for compliance restarts and the purchaser is not caught by an expired deadline. Where possible, negotiate a retention or indemnity from the vendor.

Councils receiving a request to enforce under s 17 should obtain a copy of the Court order, confirm it remains current, and give the statutory notice before entry. Accurate records of costs (including staff time, contractor invoices and the prescribed administrative charge) are essential if recovery action is contemplated. Registration of the charge under s 17A should be undertaken promptly; until registered against Torrens title land it has no effect.

Finally, all parties should keep the broader statutory context in mind. Even after a Court order is obtained and complied with, other obligations under planning instruments, heritage listings or biodiversity laws may continue. The Act is not a universal shield; it is a targeted dispute-resolution mechanism that operates within, rather than outside, the wider regulatory landscape.