What Are Retaining Wall Blocks?
Retaining wall blocks are pre-manufactured concrete units designed to interlock and create structurally sound walls. They come in various sizes, colours, and finishes to suit different applications from garden edging to major structural walls.
For block retaining walls in Perth, the most common systems include Besser blocks, Adbri Versawall, and Boral interlocking systems.
Types of Retaining Wall Blocks
Standard concrete blocks (Besser blocks) are the most affordable at $200-$300/m2 installed. Interlocking blocks like Versawall or Keystone are more expensive ($300-$450/m2) but easier to install and come in attractive finishes. Split-face blocks offer a textured natural stone appearance.
Installation Considerations
Block walls require a compacted gravel base, drainage behind the wall, and geotextile fabric. In WA, any retaining wall over 500mm needs engineering approval — see our council approval guide for details.
When to Choose Blocks
Block walls excel in situations requiring height, curves, or terracing. They are ideal for sloping Perth blocks, particularly in areas like Armadale where hills create the need for structural retention. Compare with other retaining wall types to find the best fit.