Most Queensland neighbours who fall out over a retaining wall begin from the same assumption, and it is the wrong one. They assume the wall falls under the dividing fence rules, so the cost must be shared evenly and a dispute can be taken cheaply to QCAT. Neither follows. A retaining wall dispute in Queensland runs on different law, because the Neighbourhood Disputes (Dividing Fences and Trees) Act 2011 (Qld) deliberately puts retaining walls outside its fencing regime.
Retaining wall disputes in Queensland arise mostly on sloping land, which describes much of the Gold Coast. A cut and fill subdivision leaves one lot above another, a wall holds the difference, and years later the wall begins to lean. Who pays is answered not by an even contribution rule but by who owes a duty of support, where the wall actually sits, and what any registered easement says.
A retaining wall is not a fence under the fencing legislation
Section 11(1) of the Neighbourhood Disputes (Dividing Fences and Trees) Act 2011 (Qld) defines a fence as a structure, ditch or embankment, or a hedge or similar vegetative barrier, enclosing or bounding land. It expressly includes a foundation or support built solely for the support and maintenance of the fence.
Section 11(2) then takes two things out. A fence is not a retaining wall, and it is not a wall forming part of a house, garage or other building. That exclusion is the purpose of the subsection, not an oversight.
The distinction turns on function, and s 11(1)(c) is the key to reading it. A footing poured only to hold a fence up is part of the fence. A wall that holds back earth is a retaining wall, and it stays outside the definition even where a fence is bolted to the top of it. One structure can be two things at law: a retaining element governed by the general law of property, and a fence above it governed by the Act.
Because a dividing fence under s 12 is a fence on the common boundary, and the contribution machinery is keyed to fencing work for a dividing fence, s 11(2)(a) removes the retaining wall from that machinery altogether.
What the dividing fence rules actually reach
It helps to see what is being given up. For a dividing fence the Act supplies a complete scheme: a standard in s 13, a definition of fencing work in s 16 broad enough to reach surveying and obtaining any approval the work needs, a liability to contribute in s 20, and an equal split in s 21, with the owner who wants better than the sufficient standard paying the difference. Section 20(3) adds the catch: outside urgent work, that liability is only enforceable once the neighbours have agreed or QCAT has ordered the work.
| Dividing fence | Retaining wall | |
|---|---|---|
| Statutory standard | 0.5m to 1.8m between residential parcels, in prescribed material, subject to any relevant local law, or as the owners agree or QCAT decides (s 13) | None |
| Default cost split | Equal (s 21) | None. Turns on ownership, any easement, and the duty of support |
| How it starts | Notice to contribute in the approved form, with a written quotation (s 31) | No statutory notice |
| Usual forum | QCAT | A court. The Supreme Court for encroachment relief |
| Monetary cap | Minor civil dispute limit applies | No equivalent cap |
None of it applies to a retaining wall standing on its own.
The single place the two regimes meet
There is one statutory bridge, and it is routinely missed. Section 35 lists the orders QCAT may make on a fencing application, and s 35(1)(f) allows it to order any other work necessary to carry out the fencing work it has ordered, saying in terms that this includes work for a retaining wall.
So QCAT can reach a retaining wall under the fencing Act, but only on the back of a genuine fencing dispute and only so far as the wall work is necessary to the fencing work ordered. Where the real argument is a failing wall and no fence is in issue, there is nothing for s 35(1)(f) to attach to. That is a statement about the fencing jurisdiction, not about every jurisdiction QCAT has: a wall can still surface in a tribunal matter that arrives by some other route, on its own facts.
The procedure matters if you want to get there. Section 31 requires a notice to contribute in the approved form, describing the land and the proposed work, stating the estimated cost, and accompanied by at least one written quotation. If the neighbours have not agreed within one month of the notice, either may apply to QCAT within two months of it, and s 31(7) stops either owner carrying out the work before agreement, other than urgent work.
The limit is worth knowing before anything is filed. Under schedule 3 of the Queensland Civil and Administrative Tribunal Act 2009 (Qld), a claim that is the subject of a dispute under chapter 2 of the fencing Act is a minor civil dispute only if it is for not more than the prescribed amount, which is $25,000 as at October 2026. Engineered walls on steep ground pass that figure easily.
Who is responsible for support
The provision that governs most retaining wall disputes is s 179 of the Property Law Act 2023 (Qld), in force since 1 August 2025. It replaced the equivalent provision in the Property Law Act 1974 (Qld), now repealed, and changed the shape of the claim.
Section 179 creates, for the common law of negligence, a duty of care running in both directions: the owner of supporting land owes a duty to the owner of supported land not to do or omit to do anything that adversely affects the support, and the owner of supported land owes the same duty in return. Supporting land is defined to include the natural surface, the subsoil, water on or beneath the land, reclaimed land and a structure on the land, which is how a retaining wall is caught.
- The duty runs both ways. Loading or saturating the ground above a wall, and excavating at its toe from below, are each capable of breaching the duty. Neither is prohibited outright: s 179 creates a duty of care, so what matters is whether the work was done negligently and adversely affected the support.
- It does not depend on a shared boundary. Section 179(2) applies whether or not the two parcels adjoin, and to support from structures anywhere on the land.
- Nuisance is gone. Section 179(5) abolishes the common law right, if any, to sue in nuisance for acts or omissions that adversely affect support. The claim is now in negligence, so a plaintiff must prove the duty, a breach and resulting damage, not merely interference.
The duty can be excluded or modified by express agreement under s 179(3), and where that agreement is embodied in an easement registered under the Land Title Act 1994 (Qld), s 179(4) binds the parties and each of their successors in title. That is why registering the arrangement as an easement is the most durable way to settle who maintains a wall carrying two properties.
When the wall crosses the boundary
Retaining walls are often built from the high side and end up partly on the neighbour’s land. Once a survey shows that, the question becomes encroachment.
Division 3 of part 10 of the Property Law Act 2023 (Qld) applies to an encroachment by a building, and s 183 defines a building as a substantial structure of a permanent character, including part of such a structure and expressly including a wall. An engineered retaining wall will ordinarily answer that description. Section 183 also treats intrusion on or into, or under the soil of, the land as an encroachment, which is how footings and ground anchors usually trespass.
Under s 185 either the encroaching owner or the affected owner may apply for relief, and the court may order a transfer, lease or easement of the affected land, order compensation, or order the encroachment modified or removed. In deciding, it may take into account how the encroachment came about, its nature and extent, the situation and value of the land, the planning scheme, and the loss each side would suffer.
Section 186 sets the floor, and it is a high one. If compensation is ordered, the minimum is the market value of the interest in the affected land where the encroaching owner satisfies the court that the encroachment was neither intentional nor negligent, and otherwise three times that market value. Because the onus sits on the encroaching owner, the higher floor is the starting point.
Note where these applications go. Schedule 2 of the Act defines court to mean the Supreme Court, so an encroachment application under it is neither a QCAT matter nor a small claim. Most property dispute work is about keeping an argument out of that court.
What to check before taking a position
Four checks usually change the picture, and each is cheaper than argument.
The survey. Almost every retaining wall dispute rests on an assumption about where the boundary runs. An identification survey, rather than the old fence line or a site plan, is what establishes it.
The titles. Search both titles for an easement, covenant or other encumbrance dealing with support or maintenance. What any such instrument does turns on its nature and its terms. Section 179(4) is specific: where an agreement excluding or modifying the support duty is embodied in an easement registered under the Land Title Act 1994 (Qld), it binds the parties and each of their successors in title, so it reaches the current owners.
The approval history. Whether a retaining wall needed building approval is governed by the Building Act 1975 (Qld) and the Building Regulation 2021 (Qld), and a local planning scheme can add its own controls. Whether a particular wall required approval turns on how those instruments apply to it, so it is a question to check rather than assume. Council building records usually show what was approved, and a wall built outside its approval is a different conversation from one built to it.
Who the owner is. Section 14 of the fencing Act defines owner for its purposes, and the answer is not always the occupier. For scheme land under the Body Corporate and Community Management Act 1997 (Qld) it is the body corporate. For land held under a lease or licence under the Land Act 1994 (Qld) it is that lessee or licensee, which is a state tenure and not an ordinary residential or commercial tenancy. Where land is simply let, the owner is the person entitled to the rents and profits, so for a rented house it is the landlord and not the tenant. A notice sent to the wrong person wastes the notice period.
Published 9 October 2026.
Where this leaves you
The cheap, standard form pathway people expect is not available for a retaining wall. There is no statutory standard, no statutory even split and, under the fencing Act, no QCAT outside a real fencing dispute. In its place sits a reciprocal duty of care under s 179 of the Property Law Act 2023 (Qld), an encroachment regime in the Supreme Court with the s 186 minimum behind it, and whatever the registered easements and the approval history say.
That makes the early and unglamorous work decisive: a survey, a title search, the council file, an engineer’s view on cause, and a written record.
Related reading
- Owning property with someone else in Queensland
- The Form 2 seller disclosure statement in Queensland
- How Fraser Lawyers helps with conveyancing and property
- Contact Fraser Lawyers
Need advice? A retaining wall dispute usually turns on a boundary, a title search and an approval history, and all three can be checked before anyone commits to a position. If this is your situation, contact Fraser Lawyers to understand your rights and where you stand, with no obligation. |
This article is general information only and is not legal advice. Queensland law and the figures referred to can change, and every situation turns on its own facts. Contact Fraser Lawyers for advice specific to your circumstances.
If you would like to discuss your matter, you can book a consultation or call (07) 5554 6116.
