Many homeowners ask this question when they start planning a retaining wall project: do I actually need an engineer? If you are already wondering, there is a good chance you do. Retaining walls are more than just decorative structures; they hold back tonnes of soil and protect your property from erosion and damage. Getting the right professional advice at the start can save you time, money, and risk down the track.
At Fresh Retaining Walls, we have built hundreds of engineered retaining walls across Adelaide and South Australia. We work with qualified retaining wall engineers and handle all aspects of design, council approvals, and construction to ensure your wall is safe, compliant, and built to last.
Understanding When You Need an Engineer
Council regulations in Australia can vary from state to state, but in South Australia, any retaining wall over 1000mm (1 metre) in height requires council approval. To gain approval, the retaining wall must be designed by a qualified engineer.
In some council areas, even walls under a metre may need engineering input depending on soil conditions, slope, or proximity to boundaries and structures. The higher the wall, the greater the pressure behind it, and the higher the potential risk if it is not built correctly.
Before starting any work, it is always best to check with your local council or contact professional retaining wall contractors in Adelaide, like Fresh Retaining Walls, who can handle these requirements for you.
Key Things to Consider Before Building a Retaining Wall
If you are not sure whether your project needs an engineer, think about the following points:
• Would a wall collapse endanger people or property?
• Could it cause soil erosion or water drainage issues?
• Will it affect neighbouring land or structures?
• Could it compromise your own property’s stability if it failed?
If the answer to any of these questions is yes, an engineered retaining wall design is essential.
When Council Approval Is Required
In South Australia, most councils require approval for retaining walls that meet certain criteria. These include:
• A retaining wall over 1000mm high
• A wall and fence combination exceeding 2.1 metres in total height
• Retaining walls built over easements, which require written consent from the easement owner such as SA Water
• Walls located close to sewer or stormwater infrastructure, which usually need to be set back at least one metre
• Any wall that may cause water to flow into a neighbour’s property
If you are unsure about your site or what approvals are needed, our team can manage the entire process. We work closely with trusted retaining wall engineers Adelaide homeowners rely on to ensure all designs meet council standards and safety codes.
What About Smaller Retaining Walls?
Even if your retaining wall is less than one metre high, there are still reasons to consider an engineer’s input. In some Adelaide suburbs, council limits are 600mm or 800mm, depending on soil conditions and slopes. Smaller walls may also need engineering if they are supporting a driveway, shed, or other load.
At Fresh Retaining Walls, we can arrange for an engineer to inspect your site and determine whether design documentation or certification is required. This gives you peace of mind knowing your wall is safe, legal, and built to professional standards.
Why Choose Professional Retaining Wall Contractors
Building a retaining wall is not just about stacking sleepers or rocks. Proper drainage, compaction, and structural design are vital to prevent movement or failure. Professional retaining wall builders in Adelaide, like Fresh Retaining Walls, understand these requirements and ensure every stage is completed correctly.
We specialise in concrete sleeper retaining walls and bluestone rock retaining walls, both engineered for strength and durability. Our in-house earthworks team and experienced tradesmen deliver quality construction that meets engineering specifications and council regulations.
Speak to The Retaining Wall Experts
If you are planning a retaining wall and are unsure whether you need engineering or council approval, talk to Fresh Retaining Walls today. We can connect you with experienced retaining wall engineers, help you obtain approvals, and manage the entire project from start to finish.
As one of the most trusted retaining wall contractors in Adelaide, we are proud to provide the best retaining walls Adelaide homeowners can depend on.
Contact The Retaining Wall Experts today for professional advice and a free site assessment.
👉 Get in touch with us to discuss your project.