Gabion Retaining Wall Cost Perth 2026

Gabion retaining walls in Perth typically cost between $200 and $450 per square metre installed. The cost varies based on wall height, stone fill type, and site conditions. Local limestone rubble is the most affordable fill option in Perth. These are indicative ranges only.

Gabion walls can be comparable or slightly cheaper than concrete sleeper walls for certain applications. Gabions range from $200–$450/m2 versus $250–$500/m2 for concrete sleepers. Gabions excel where drainage is critical, as they are inherently free-draining and don’t need separate drainage systems.

Local limestone rubble is the most popular and affordable fill for gabion walls in Perth, given WA’s abundant limestone deposits. Granite from local quarries is another excellent option. The fill should be hard, durable, and sized appropriately for the basket mesh — typically 100–200mm stones.

One of the main advantages of gabion walls is that they are inherently free-draining — water passes through the rock fill naturally. This can save $30–$80 per lineal metre on drainage compared to solid wall types. However, you may still need a geotextile membrane behind the wall to prevent soil washout.

Well-constructed gabion walls with quality galvanised or Galfan-coated wire cages last 50–100+ years. Perth’s dry Mediterranean climate is ideal for gabion longevity as there is less moisture to corrode the wire. Coastal locations should use marine-grade coated baskets.

Like all retaining walls in WA, gabion walls over 0.5 metres require a building permit and typically need engineering certification. Despite their perceived simplicity, gabion walls are structural elements and must comply with the same regulations as other wall types.