Concrete Sleeper Retaining Walls in Bunbury

How the wall is built

A concrete sleeper wall stacks precast concrete panels between steel posts that are set in concrete footings. The posts carry the load, and the sleepers hold the soil between them. Ask the builder to describe the post spacing, the footing size and how the sleepers are fixed, so you can compare it with any other quote on the table.

What the guide says it costs

One national guide, updated by its publisher on 5 June 2026, gives $350 to $650 per square metre of wall face for concrete sleepers with steel posts, installed and including GST. It calls them a good choice for a long-life wall with a clean modern look. This is not a Bunbury price, so ask each builder for a written quote.

Timber against concrete

The guide says treated timber is usually the cheapest for low walls, but it has a shorter life. It says concrete sleepers cost a bit more and last far longer, which often makes them better value over time. Ask the builder what warranty they give for the wall, and put it in writing rather than accepting a spoken promise.

Footings carry the load

The guide says posts are concreted into footings, and that hard ground, rock or a surcharge load, such as a driveway or a building above the wall, means deeper and stronger footings. Tell the builder what sits above the wall now, and ask what footing depth is quoted. A cheap quote can be cheap because the footings are shallow.

The worked example

The guide prices a 12 metre long, 1 metre high concrete sleeper wall at about $8,300: $3,200 for sleepers and posts, $1,800 for footings and excavation, $900 for drainage and backfill and $2,400 for labour. It says that is roughly $690 per square metre. Use it to check how a quote is split, not to set a budget.

Drainage behind the wall

Sleepers sit close together, so water has to be given a way out. The guide says drainage means agricultural pipe, free-draining gravel and weep holes, and that skipping it is the most common reason cheap walls fail. Ask where the pipe exits, what gravel is used and whether anything stops soil from clogging the gravel.

Bunbury's rain

The Bureau of Meteorology station at Bunbury averages 737.3 millimetres a year and 23.8 days a year with 10 millimetres or more. Its highest daily fall is 92.0 millimetres. A wall built on a sandy or sloping block has to cope with those days as well as the dry summer. Ask how the drainage handles the heaviest rain.

Height and approval

The City of South Perth quotes the Building Regulations 2012 as exempting a wall that retains no more than 0.5 metres, with conditions. The guide says taller walls usually need an engineer and approval. Neither is a Bunbury rule. Ask the City of Bunbury, or the shire that covers your address, what applies to the wall you want.

Permit paths

The City of Bunbury says building work may need a permit, and lists certified and uncertified application paths. A certified one uses a private building surveyor and a certificate of design compliance. The City says it has up to 10 business days for a certified application and up to 25 for an uncertified one. Ask the builder which path they will use.

Near a boundary

The City of South Perth says a wall may be built across a boundary only with written agreement from the neighbours, and the City of Bunbury lists a BA20 consent form. The City of Joondalup says a dividing fence sits on the higher ground of a boundary wall. Ask who talks to the neighbour, and keep each agreement in writing.

Registration check

The Western Australian Government register page says builder-work valued over $20,000 must be done by a registered building service contractor, and it says to check the name, number and licence type. It does not say whether a wall counts. Ask the business what applies, ask for the number and check it before paying a deposit.

What the quote should list

Ask for length, height, face area, sleeper type, post size, footing depth, drainage, waste removal, any permit fees and the warranty. The guide also says to ask whether the price is fixed or an estimate. Compare three written quotes for the same wall, and ask each business to explain any large gap between them.

Next steps

Read the drainage and engineered wall guides, then send the form with your suburb, the wall length and the slope. Independent builders who cover Bunbury may reply, and you can ask each one the questions above. We do not build walls or check businesses.

How much does a concrete sleeper wall cost?

One national guide gives $350 to $650 per square metre of wall face, installed and including GST. It is not a Bunbury quote, so ask for written prices.

Do concrete sleepers last longer than timber?

The guide says concrete sleepers cost a bit more than timber and last far longer. Ask each builder what warranty is given in writing.

Is drainage included in the price?

It should be, but ask. The guide says agricultural pipe, gravel and weep holes should be specified on the quote.

Do I need approval for a concrete sleeper wall?

It can depend on height, position and the council. Ask the City of Bunbury or your shire, and ask the builder who handles any permit.

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