Retaining walls are essential on sloping blocks and are increasingly popular as Melbourne homeowners maximise usable outdoor space. Here is what you need to know.
When Do You Need a Retaining Wall?
A retaining wall is needed when you have a level change on your property that needs to be held in place — whether that is a sloping driveway, a tiered garden, or a cut into a hillside. They prevent soil movement, erosion and can transform an unusable slope into functional garden beds or lawn areas.
Types of Retaining Walls
Timber Sleeper Walls: Hardwood or treated pine sleepers are a cost-effective option for garden beds up to 900mm high. Merbau sleepers are particularly popular for their durability and appearance. Cost: $200–$400 per linear metre.
Concrete Block Walls: Suitable for larger walls that need significant structural strength. Various face finishes available including split face and smooth render. Cost: $350–$600 per linear metre.
Natural Stone Walls: Dry-stacked or mortared bluestone and granite walls add significant character. Often seen in Melbourne's inner east suburbs. Cost: $500–$900 per linear metre.
Permit Requirements
In Victoria, retaining walls over 1 metre in height generally require a building permit. Adjacent to boundaries, lower heights may trigger permit requirements. Always check with your local council before proceeding.
Drainage
Proper drainage behind a retaining wall is critical. Without adequate drainage, hydrostatic pressure will cause even well-built walls to fail over time. Antonio installs aggi pipe and drainage aggregate behind every retaining wall.