Who is responsible for a retaining wall between two Queensland properties?

Retaining wall disputes are among the most common — and most misunderstood — neighbour conflicts in Queensland. The key legal principle is that responsibility is determined by who benefits from the wall, not simply by whose boundary it sits on or who built it.

The Basic Legal Rule: Benefit, Not Boundary

There is no single Queensland Act that directly governs retaining wall responsibility. Unlike dividing fences (which are regulated by the Neighbourhood Disputes (Dividing Fences and Trees) Act 2011 (Qld),¹ retaining walls fall under the common law of property and the principle that you must support your own land.

The leading common law principle is:

The owner who has the benefit of the wall retaining soil on their side bears primary responsibility for it.

This means:

Scenario	Who Is Responsible
Upper owner elevated their land (added fill) after the lower block was already established	Upper owner — their fill created the condition requiring the wall
Lower owner excavated into the slope to level their yard	Lower owner — their excavation created the condition requiring the wall
Both parties contributed to the conditions requiring the wall	Shared — a proportional arrangement may be negotiated
Wall sits entirely on one owner’s land (not on the boundary)	Owner on whose land the wall sits

The 90-Centimetre Rule

Retaining walls are also subject to Gold Coast City Council (and other council) planning rules. In general:

• Walls under 90 cm in height on a property boundary are typically a private matter between neighbours.
• Walls over 90 cm generally require development approval, engineering certification, and compliance with the Queensland Development Code.

If a retaining wall is over 90 cm and has been built without the required approval, Council can issue an enforcement notice requiring the owner responsible to bring it into compliance. This can be a useful mechanism if a neighbour refuses to address a failing wall.

What If the Neighbour Disputes Responsibility?

If your neighbour disputes who is responsible and you cannot reach an agreement, your options depend on the specifics:

QCAT — Limited Jurisdiction

The Queensland Civil and Administrative Tribunal (QCAT) does not have direct jurisdiction to hear retaining wall disputes.² QCAT can hear dividing fence disputes under the Neighbourhood Disputes Act 2011 (Qld), and if a fence sits on top of the retaining wall and needs to be moved as part of the works, QCAT may be able to hear both issues together. But a pure retaining wall dispute — with no fence component — must be pursued elsewhere.

Gold Coast City Council

Council’s building and planning compliance team can inspect a retaining wall and, if it poses a risk to life or property, issue a notice to fix requiring the responsible owner to carry out repairs. This is a practical first step where a failing wall is causing immediate problems.

Magistrates Court or District Court

Where the retaining wall dispute involves a claim for compensation (for example, because a neighbour’s failing wall has allowed soil to collapse onto your property and caused damage), you can bring a claim in the:

• Magistrates Court for amounts up to $150,000
• District Court for amounts between $150,000 and $750,000

Practical Steps If You Have a Retaining Wall Dispute

1. Determine who created the condition. Find old council survey records, aerial photographs, or subdivision documentation to establish the original levels of each property.
2. Engage a structural engineer to assess the wall’s condition, confirm what work is required, and provide an independent opinion on responsibility.
3. Contact Gold Coast City Council if the wall is over 90 cm, appears structurally unsound, or is causing immediate risk.
4. Write to your neighbour setting out your position — in writing — before commencing any QCAT or court proceeding.
5. Seek legal advice if the dispute cannot be resolved informally.

Related Topics

• Dividing Fence Disputes in Queensland
• Tree Damage Liability in Queensland
• Overhanging Branches — Who Is Responsible?
• Legal Matters Ep 17: AI Law, Privacy & Retaining Walls

Professional Guidance

Retaining wall disputes can escalate quickly if left unresolved. Early legal advice can help you understand your position and negotiate a practical resolution before expensive litigation becomes necessary.

📞 (07) 5532 8777 | 🌐 bellsenior.com.au | Contact us

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