Retaining wall calculator
Posts, sleepers and concrete for a timber wall. Metric, updates as you type. An estimate to plan with and to describe the job — not a cut list or a quote.
over 1.5 m usually needs an engineer
Estimate
Posts2 m long at 1.2 m centres11
Sleepers / rails5 rows of 200 mm sleepers, 1.2 m long50
Concrete for postsabout 78 x 20 kg bags0.78 m³
Estimated installed costsupply and labour, incl. GST · retaining wall$6,000–$11,000
Refine this estimate →Assumes posts at 1.2 m centres, buried as deep as the wall is high (600 mm minimum); 300 mm post holes; 200 mm sleepers; drainage, backfill and engineering not included; walls over 1.5 m or with a load behind them usually need an engineer and a consent. An estimate for planning and for describing the job, not a cut list or a quote.
What does the whole job cost? See landscaping prices in the cost guide.
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