Do You Need a Council Permit for a Retaining Wall on the Gold Coast?

The City of Gold Coast states that retaining walls need building approval unless they meet all of the following criteria:

• Less than 1.0 metre high
• More than 1.5 metres from a building or another retaining wall
• Supports only the soil behind the wall, with nothing above it
• Not part of pool fencing
• Combined wall and fence height under 2.0 metres
• Not built over a service such as sewer or stormwater
• Meets structural requirements
• Not in an easement or covenant area
• Meets any earlier development conditions on the land
• Not in a waterfront or oceanfront setback area

The word that matters is all. If your wall fails even one of these tests, it needs building approval. A 900 millimetre wall that sits 1.2 metres from your house still needs approval, even though it is under the height limit.

Many homeowners search for a council permit, but in Queensland building work is assessed by a private building certifier. The City of Gold Coast confirms that earthworks incidental to a retaining structure are treated as building work, not operational works, and that approval for that work comes from a private certifier.

Building certifiers are licensed by the Queensland Building and Construction Commission (QBCC). Their job is to check that the proposed wall complies with the Building Act 1975, the Building Regulation 2021 and the National Construction Code. Retaining walls are classified as Class 10b structures, which means they are non-habitable structures such as fences, masts and walls.

That does not take council out of the picture. Council still controls planning matters, siting, stormwater, easements and compliance complaints. A sensible approach is to treat building approval and council requirements as two parts of the same job.

A retaining wall is a structure built to hold back soil or rock, to stop erosion, or to create usable flat land on a slope. It is different from a fence, which marks a boundary or provides privacy. A fence built on top of a retaining wall is assessed together with the wall, so the combined height matters.

Timber sleepers, concrete sleepers, besser blocks, modular blocks, sandstone, gabions and reinforced concrete can all form a retaining wall. The material does not change whether approval is required. Height, location and load do.

These are the situations where Gold Coast homeowners most often need approval.

• Height. A wall over 1 metre in height needs building approval. This is measured as the total height of the wall plus the cut or fill it retains, so a 700 millimetre wall retaining 500 millimetres of fill above it is already over the threshold.
• Distance from buildings. A wall within 1.5 metres of a house, shed or another retaining wall needs approval, because it can affect or be affected by the structure beside it.
• Surcharge loading. If a driveway, pool, building or other load sits within the wall's zone of influence, the wall must be engineered. Surcharge loading is one of the most commonly missed triggers.
• Fence on top. A wall and fence together must stay under 2.0 metres, and the fence must not change the way the wall is loaded.
• Pool fencing. If the wall forms part of a pool barrier, it is no longer a simple garden wall.
• Services. Walls built over sewer or stormwater lines need approval, and the utility may place conditions on the footing.
• Easements and covenants. You generally cannot build in these areas without permission.
• Waterfront and oceanfront setbacks. Canal and beachfront lots in suburbs such as Paradise Point, Mermaid Waters and Main Beach carry extra setback rules.

Three different types of approval can apply, and they are easy to confuse.

Building approval covers the structure itself and is issued by a private certifier. Planning approval deals with how the work fits the City Plan and may be triggered by overlays, estate conditions or a larger development. Operational works approval relates to major earthworks that are not incidental to a building structure.

For an ordinary house block, building approval is the one most owners need. If the property is on a waterfront lot, in a flood or landslide-affected area, or subject to conditions from the original estate approval, ask your certifier or council whether anything further is needed before you start.

For a wall that needs approval, you will normally need three people.

1. A structural or civil engineer. In Queensland this is usually a Registered Professional Engineer of Queensland (RPEQ), who designs the wall and certifies the design.
2. A private building certifier. They assess the plans, issue the building approval and carry out inspections.
3. A licensed contractor. Anyone carrying out building work valued over $3,300, including labour and materials, must hold the appropriate QBCC licence.

Owners can build on their own land, but if the work is valued at $11,000 or more, an owner builder permit is required. There is no QBCC insurance cover on owner builder work, which is a real risk for a structure that holds back tonnes of soil.

Requirements vary, but a typical application for an engineered retaining wall includes:

• A site plan showing boundaries, the house and the wall location
• A cross-section showing existing and proposed ground levels
• Engineering drawings and a design certificate from an RPEQ
• A drainage design
• QBCC licence details and insurance confirmation for the builder
• An owner builder permit, if relevant

Your certifier will confirm the exact list for your site.

1. Check the wall against the Gold Coast criteria above.
2. Look up your property in the City Plan for overlays, easements and setbacks.
3. Speak to a certifier before you finalise the design.
4. Engage an engineer to design the wall and drainage.
5. Lodge the application, receive approval and engage a licensed contractor.
6. Arrange the required inspections and keep your final certificate with the property records.

The City of Gold Coast recommends a side boundary setback of at least 600 millimetres to avoid maintenance and ownership issues with your neighbour. Building right on the boundary can make it unclear who is responsible for the wall, and it limits access for repairs.

Stormwater must be captured and piped to the kerb or the stormwater system. It must not be concentrated onto your neighbour's property as a result of the work. Poor drainage is one of the main reasons retaining walls fail.

Council also advises speaking to your neighbour before you start if the wall affects them. Early conversation avoids most disputes.

An unapproved wall can cause problems long after it is built. Council can investigate complaints, and when a complaint involves a wall between adjoining properties, council asks for an identification survey to establish which lot the wall sits on. Queensland councils can issue notices requiring owners to engage an engineer, obtain approval and provide a final inspection certificate, sometimes at significant cost.

There are also practical risks. A wall built without certification can create difficulties when you sell, because buyers' solicitors and building inspectors may ask for approvals. It can also affect insurance claims if the wall fails. Getting approval up front is almost always cheaper than fixing the problem later.

Gold Coast canal estates and beachfront lots have extra rules. A waterfront or oceanfront setback area is one of the conditions that removes the exemption for small walls, and revetment walls along the water's edge usually need approval under State legislation, City Plan or both. If your property backs onto a canal, speak to your certifier and council before you plan any excavation or fill near the water.

Can I build a 600 millimetre retaining wall without a permit on the Gold Coast?
Yes, if it meets every criterion in the list above, including the 1.5 metre distance from buildings and no load above the wall.

Do I need council approval to replace an old retaining wall?
A replacement wall is assessed the same way as a new one. If the new wall exceeds the thresholds or sits in a restricted area, building approval is required.

Who approves a retaining wall on the Gold Coast?
A private building certifier issues building approval. The City of Gold Coast sets planning, setback and stormwater requirements.

Do I need an engineer?
If the wall needs building approval, expect your certifier to require engineering. Even for exempt walls, structural requirements still apply.

Can my builder organise the approval?
Most licensed retaining wall contractors work with an engineer and certifier and can manage the process for you.

This article is general information only and is not legal or engineering advice. Rules change, so confirm your wall's requirements with a building certifier and the City of Gold Coast before you start work.