What a retaining wall costs in Melbourne

What drives the price

Height and material set the rate per metre. Melbourne guides put a 1 m wall at roughly $210 to $470 per metre in treated pine sleepers, $295 to $630 in hardwood, $315 to $630 in concrete sleepers on steel posts, $370 to $790 in core-filled concrete block and $260 to $630 in boulders; a 1.5 m concrete sleeper wall runs $420 to $1,000 per metre and a block wall of that height $580 to $1,575, because taller walls need deeper posts, bigger footings and an engineer. Below 1 m the estimator scales the 1 m figure by the height; above it, it uses the taller figures where the source gives them.

Drainage is not optional: slotted pipe, gravel and filter fabric behind the wall add about $32 to $84 per metre and stop the wall being pushed over by waterlogged soil. The cost nobody prices until they’ve seen the site is the ground: clay, rock, roots, a slope that needs a machine, or a wall that is really two terraces.

• Length and retained height, measured from the lowest ground to the top
• Material: timber sleepers, concrete sleepers, block, or stone and boulders
• Drainage behind the wall, and where it drains to
• Whether it’s on or near a boundary, or holds up a neighbour’s land
• Removing an old wall, and access for a machine

The 1 m rule, and boundaries

The Building Regulations 2018 exempt a retaining wall from a building permit only when it is less than 1 m high and isn’t tied to other building work or to protecting an adjoining property. So a wall of 1 m or more needs a building permit from a registered building surveyor, who will want an engineer’s design (guides put that at $800 to $2,500) and may ask for a soil report, plus the permit and inspection fees of roughly $470 to $1,900. A lower wall on or near a boundary, or one holding up the neighbour’s land, can need a permit at any height; councils generally expect an exempt wall to sit back from a boundary or building by at least its own height.

A fence on top counts towards the fence height limits, measured from natural ground, and a heritage or environmental overlay can add a planning permit. Retaining structures are domestic building work, so a wall worth more than $10,000 needs a builder registered with the Building and Plumbing Commission and a major domestic building contract. See the brick and retaining wall guide and dividing fences.

What the quote should cover

• Post depth or footings, and the engineer’s design if there is one
• Sleepers or blocks: material, grade and finish
• Drainage: pipe, gravel, fabric and the outlet
• Backfill, and disposal of spoil
• The building permit, if the wall needs one, and who applies
• Removing the old wall, and protecting what’s next to it
• Before You Dig Australia before post holes go in

Example brief

“Build a retaining wall about 12 m long and 1.2 m high along the back of a sloping yard in Berwick, in concrete sleepers on galvanised steel posts, with drainage behind it to the stormwater pit. It’s about 2 m from the rear boundary. Please quote the wall, drainage and backfill, arranging the engineer’s design and the building permit, and disposal of spoil.”

Before you ask for quotes

• Measure the length, and the height from the lowest ground to where the top will be
• Decide the material, and whether a fence goes on top
• Check the distance to the boundary and the nearest building
• Expect an engineer and a permit at 1 m or more
• Compare quotes on post depth, drainage and what happens to the spoil

The estimator’s Get quotes button carries your details into the job form as a draft. You can also start a job request from scratch, read the brick and retaining wall guide, or compare the written quotes once they arrive. Availability depends on real postings, and registration must be enabled to submit.

How this estimate is built

Each line multiplies a per-unit range from the named sources by the quantity you entered, fixed items are added as their own lines, and the total is widened to round numbers. The sources were checked on 2 November 2026. It is an indicative range for comparing written quotes from a bricklayer who has seen the job, not a quote. See all cost guides for how the ranges are made.