One of the most common questions before starting a retaining wall project is: do I need council approval? The answer depends on your state, your local council, the height of the wall, its proximity to boundaries and structures, and whether there are surcharge loads above it.

This guide summarises the general approval requirements across Australia's main states. For a comprehensive overview of retaining wall permit rules in Australia — including AS4678 standards, engineer certification requirements, and state-by-state compliance — visit our regulations and compliance hub. It is a general information guide only — retaining wall approval requirements vary significantly between local government areas, and the rules change over time. Always confirm requirements with your local council, a registered certifier, or a licensed building surveyor before starting work.

The General Rule Across Australia

In most Australian states and territories, retaining walls over 1.0m in height require some form of approval — either a development application (DA), a complying development certificate (CDC), or a building permit. Walls under 1.0m may be exempt from approval in many areas, but this is not universal — proximity to boundaries, easements, and structures can trigger approval requirements at lower heights.

The 1.0m threshold is a general guide, not a universal rule. Some councils have lower thresholds (600mm or 800mm), and some have higher thresholds for certain zones or wall types. Do not assume your wall is exempt without confirming with your local council.

New South Wales (NSW)

General Rule

In NSW, retaining walls are generally assessed under the State Environmental Planning Policy (Exempt and Complying Development Codes) 2008. Under the Exempt Development provisions, retaining walls may be exempt from approval if they meet specific criteria — typically walls under 1.0m in height that are not near boundaries, easements, or structures. For full detail, see our NSW retaining wall regulations guide.

When Approval Is Required

• Wall height exceeds 1.0m (finished retained height)
• Wall is within 1.0m of a boundary
• Wall is near an easement, drainage line, or sewer
• Wall is near a structure (house, pool, shed)
• There is a driveway or vehicle load above the wall
• The site is in a flood, bushfire, or heritage overlay

Approval Pathway

Walls requiring approval in NSW can typically be approved as Complying Development (CDC) through a private certifier, or as a Development Application (DA) through your local council. Engineering certification from a licensed structural engineer is typically required for walls over 1.0m.

Key Councils to Check

Requirements vary across NSW councils. Sydney councils including Northern Beaches Council, Ku-ring-gai Council, Blacktown City Council, and Georges River Council each have their own DCP provisions that may be more restrictive than the state minimum. Always check your specific council's Development Control Plan (DCP).

Victoria (VIC)

General Rule

In Victoria, retaining walls are regulated under the Building Act 1993 and Building Regulations 2018. Retaining walls over 1.0m in height generally require a building permit. Some walls under 1.0m may be exempt, but this depends on proximity to boundaries and other structures. See our VIC retaining wall regulations guide for full detail.

When a Building Permit Is Required

• Wall height exceeds 1.0m (finished retained height)
• Wall is within 1.5m of a building
• Wall is near a boundary where failure could affect neighbouring property
• There is a surcharge load above the wall

Approval Pathway

Building permits in Victoria are issued by a registered building surveyor (either council or private). Engineering certification from a licensed structural engineer is required for walls over 1.0m. The building surveyor will specify what documentation is required for your specific wall.

Key Councils to Check

Melbourne's 31 local government areas each have their own planning overlays that may impose additional requirements. Councils in areas with significant slope (Yarra Ranges, Nillumbik, Mornington Peninsula) often have specific provisions for retaining walls. Check your council's planning scheme before starting.

Queensland (QLD)

General Rule

In Queensland, retaining wall approval requirements are set by individual local governments under the Planning Act 2016. There is no single statewide threshold — requirements vary significantly between councils. See our QLD retaining wall regulations guide for full detail.

Brisbane City Council

Under Brisbane City Council's planning scheme, retaining walls over 1.0m in height generally require a building development approval. Walls near boundaries, easements, or structures may require approval at lower heights. Check the Brisbane City Council website or contact their development assessment team for current requirements.

Other SEQ Councils

Gold Coast City Council, Sunshine Coast Council, Moreton Bay Regional Council, Ipswich City Council, and Logan City Council each have their own requirements. Do not assume Brisbane City Council's rules apply to other SEQ councils.

Approval Pathway

Retaining wall approvals in Queensland are typically processed as building development approvals through a private building certifier or the local council. Engineering certification is required for walls over 1.0m in most Queensland councils.

Western Australia (WA)

General Rule

In Western Australia, retaining walls are regulated under the Building Act 2011 and Building Regulations 2012. Retaining walls over 0.5m in height that are within 1.5m of a boundary generally require a building permit. Walls over 1.0m in height generally require a building permit regardless of boundary proximity. See our WA retaining wall regulations guide.

When a Building Permit Is Required

• Wall height exceeds 1.0m
• Wall is over 0.5m and within 1.5m of a boundary
• Wall is near a structure or easement

Approval Pathway

Building permits in WA are issued by the local government or a private building surveyor. Engineering certification is required for walls over 1.0m. Check with your local council (City of Perth, City of Stirling, City of Joondalup, etc.) for specific requirements.

South Australia (SA)

General Rule

In South Australia, retaining walls are assessed under the Planning, Development and Infrastructure Act 2016. Walls under 1.0m in height are generally exempt from development approval in most zones. Walls over 1.0m require development approval in most cases. See our SA retaining wall regulations guide.

Approval Pathway

Development approvals in SA are processed through the SA Planning Portal. Engineering certification is required for walls over 1.0m. Check with your local council or the SA Planning Portal for current requirements in your zone.

Engineering Triggers — When You Need a Structural Engineer

Regardless of whether council approval is required, a licensed structural engineer's sign-off is strongly recommended (and often required) in the following situations:

• Wall height exceeds 1.0m (finished retained height)
• Wall is retaining a driveway, vehicle parking, or structure above
• Wall is near a boundary where failure could affect neighbouring property
• Soil is heavy clay, reactive, waterlogged, or unstable
• The site has a history of movement, slippage, or drainage problems
• The wall is near an existing structure (house, pool, shed, another retaining wall)
• Council approval requires engineering certification

A structural engineer's fee for a residential retaining wall specification is typically a small fraction of the cost of rebuilding a wall that has failed. It's worth it. See our guide on how to get council approval for a retaining wall for step-by-step guidance.

Boundary Rules — What You Need to Know

Retaining walls near boundaries raise additional considerations beyond council approval:

• Neighbour notification: In some states and councils, you may be required to notify your neighbour before building a retaining wall near a shared boundary. Check your local requirements.
• Boundary fences: If your retaining wall also functions as a boundary fence, additional rules under state fencing legislation may apply. In most states, boundary fences require neighbour agreement on cost-sharing.
• Easements: Never build a retaining wall over or near an easement without confirming with the relevant authority (council, utility, water authority) that it is permitted. Building over an easement can result in the wall being required to be demolished at your cost.
• Encroachment: A retaining wall that encroaches onto a neighbouring property — even by a small amount — is a legal issue. Confirm the boundary location with a licensed surveyor before building near a boundary. See our guide on building a retaining wall on a boundary.

Frequently Asked Questions

Do I need council approval for a retaining wall under 1m?

In many areas, walls under 1.0m are exempt from approval if they are not near boundaries, easements, or structures. However, this is not universal — some councils have lower thresholds, and proximity to boundaries can trigger approval requirements at lower heights. Always confirm with your local council before starting.

Can I build a retaining wall on the boundary?

Building a retaining wall on or near a boundary typically requires council approval and may require neighbour notification. In some states, boundary walls are subject to fencing legislation as well as building regulations. Confirm requirements with your local council and consider engaging a surveyor to confirm the boundary location before starting.

What happens if I build a retaining wall without approval?

Building a retaining wall without required approval can result in a council order to demolish and remove the wall at your cost, fines, and difficulty selling the property. It can also affect your insurance coverage if the wall fails. Always confirm approval requirements before starting.

How long does retaining wall approval take?

Complying development certificates (NSW) and building permits (VIC, WA) through private certifiers can often be issued within 10–20 business days for straightforward applications. Development applications through council can take 40–100+ days depending on the council and the complexity of the application. Factor approval time into your project timeline.

Before You Order Materials

Confirm your approval requirements before ordering materials. If your wall requires engineering, get the engineer's specification before ordering posts and sleepers — the engineer may specify a different post type or size than you were planning. Browse our full range of concrete retaining wall sleepers and galvanised steel retaining wall posts, or contact our team to discuss your project.