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Retaining Wall Construction Costs

Retaining Wall Costs

Average costs per linear metre (1m high):

  • Timber sleepers: $200-350/m
  • Concrete sleepers: $300-500/m
  • Besser blocks: $350-550/m
  • Sandstone blocks: $400-700/m
  • Boulder wall: $300-600/m
  • Gabion: $400-700/m

Height Affects Cost

  • Under 600mm: Simple DIY possible
  • 600mm-1m: Drainage critical
  • 1m-1.5m: Engineering likely required
  • Over 1.5m: Structural engineering mandatory

Example Costs (10m wall)

  • Timber 600mm: $1,500-2,500
  • Timber 1m: $2,000-3,500
  • Concrete 1m: $3,000-5,000
  • Sandstone 1m: $4,000-7,000

What's Included

  • Excavation
  • Drainage (ag pipe, gravel)
  • Wall construction
  • Backfill
  • Basic soil reinstatement

When You Need Engineering

  • Walls over 1m in most councils
  • Near boundaries
  • Supporting structures
  • Poor soil conditions
  • Steep slopes

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