Retaining wall cost in Melbourne (2026).

Indicative prices by wall type

Retaining walls are usually priced per square metre of wall face (length × height). Indicative 2026 Melbourne ranges, inc. GST:

• Timber sleeper: $250–$450 per m²
• Concrete sleeper with steel posts: $350–$600 per m²
• Gabion: $450–$800 per m²
• Core-filled block: $500–$850 per m²
• Sandstone: $550–$950 per m²
• Poured concrete: $650–$1,100 per m²

So a 20 m concrete sleeper boundary wall, 600 mm high (12 m² of face), is indicatively around $4,200–$7,200.

Why height changes everything

Soil pressure grows quickly as a wall gets taller. Over about 1 metre you generally need an engineer's design and a building permit, bigger posts or block, deeper footings and more steel — so the price per m² climbs. Walls near a boundary, building, driveway or easement can need engineering even when they're lower.

What a proper quote includes

• Post or footing size, depth and spacing
• Ag-pipe drainage with sock or geofabric
• Clean gravel backfill behind the wall
• Where the drainage discharges
• Removal of excavated soil
• Engineering and permit, if needed

If drainage isn't on the quote, ask why. It's the number one reason walls fail.

Cheapest vs best value

Timber is cheapest up front but typically lasts 10–20 years. Concrete sleepers cost more but don't rot, so over the life of the wall they're usually the better buy — which is why they're the default in Melbourne's new estates.

Quick answers