How much does a retaining wall cost?

Retaining walls typically cost $250–$700 per m² of wall face in Australia, with most residential walls landing between $3,000 and $10,000.

Typical price band

$7,000typical

$1,500 low$25,000 high

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Real-world examples

Low timber garden wall$1,500 – $3,500

Concrete sleeper wall$5,000 – $9,500

Engineered wall over 1 metre$12,000 – $25,000

— Wall face area. Length times height is the core quantity — taller walls also need heavier posts and footings.

— Material. Treated timber is cheapest but has the shortest life; concrete sleepers and masonry cost more and last decades.

— Engineering & approvals. Walls above roughly 1 m usually need an engineer's design and council sign-off, adding $1,500–$4,000.

— Drainage & backfill. Ag-pipe, gravel backfill and stormwater connection are essential and add real cost.

— Access & excavation. Machine access keeps digging cheap; hand excavation on tight sites multiplies labour.

— Check your council's height threshold before designing — approval requirements kick in at 0.5 m in some areas.

— Never skip the drainage behind the wall; water pressure is what destroys retaining walls.

— Concrete sleepers cost more than timber upfront but usually work out cheaper over the life of the wall.

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Indicative range only, not a quote. Get quotes from local tradies for an exact price. Last updated 13 July 2026.

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