If you’re planning a retaining wall on your Brisbane property, the approval question comes up almost immediately. The answer depends on how high the wall will be, where it sits on your block, and whether it affects a neighbouring property. Getting this wrong can mean costly rework, so it pays to understand the rules before you start.
The Height Rule That Determines Everything
In Brisbane, retaining walls under one metre in height generally do not need a building approval. Once a wall reaches one metre or higher, a building approval is required before construction begins. That one-metre threshold is measured from the finished ground level on the lower side of the wall.
Height is not the only factor. If your wall is close to a boundary, near a building, or on a steep block, additional requirements may apply regardless of how tall the wall is.
When Your Neighbour’s Property Is Involved
Retaining walls that sit on or near a boundary line can affect the neighbouring property, particularly in terms of drainage, soil movement, and structural load. Work that impacts a neighbouring property carries specific obligations under Queensland law, including notifying your neighbour before work begins in some circumstances.
Disputes over retaining walls between neighbours are more common than most people expect. Sorting out responsibility for the wall, and who pays for it, is much easier when the approval and notification steps are handled correctly from the start.
What QBCC Licensing Has to Do With It
Even if your wall falls below the approval threshold, the person building it may still need a QBCC licence. In Queensland, retaining walls over one metre must be designed and built by a licensed contractor. For walls under one metre, the licensing requirement is less strict, but the quality of the work still matters significantly for drainage and long-term stability.
Choosing an unlicensed builder for a wall that legally requires a licensed one can create problems when you sell the property or make an insurance claim. Always confirm your contractor holds the appropriate QBCC licence for the scope of work.
Moreton Bay Regional Council vs Brisbane City Council
The rules above apply specifically to properties within the Brisbane City Council area. If your property falls under Moreton Bay Regional Council, the thresholds and application process may differ. Many properties on Brisbane’s northside sit close to the boundary between the two council areas, so confirming which council governs your block is a sensible first step.
Your rates notice or the Queensland Globe mapping tool will tell you which local government area your property falls under. Do not assume the Brisbane City Council rules apply just because you think of yourself as living in Brisbane’s north.
Retaining Walls and Fencing on the Same Project
Many homeowners build a retaining wall and a fence at the same time, particularly on sloped blocks where the wall creates a level area along the boundary. These two structures have separate approval pathways, and the fence installation process involves its own set of considerations around height, materials, and boundary placement.
If you are combining both on one project, it is worth scoping them together from the beginning. A contractor who handles both can flag any conflicts between the two structures early, before concrete is poured or posts are set.
Practical Steps Before You Build
Before any work starts, confirm your wall height and measure from the correct reference point on the lower side. If the wall will be one metre or higher, lodge a building approval application with your local council. Engage a licensed contractor who can certify the design if required.
If the wall sits near a boundary, speak with your neighbour before work begins. A brief conversation early on avoids disputes that can drag on for months. Keep records of any agreements in writing.
Ready to Talk Through Your Project?
If you are planning a retaining wall on Brisbane’s northside or in the Moreton Bay area and want straightforward advice on what approvals you need, our team is happy to help. We work across the region, including fencing Aspley, Sandgate and other surrounding suburbs, and can point you in the right direction before you commit to anything.
Call us on (07) 3184 8531 or send us a message through our project enquiry form and we will get back to you promptly.
