Tierline Retaining Walls Know the number, and the rules, before you build the wall.
Retaining walls get quoted thousands apart for the same slope, because the cheap quote sits the wall on a shallow pad, leaves the drainage off, and never mentions that over a metre it needs an engineer and council. The differences only show up later, when the wall bulges. These guides put them back in the conversation: what a wall costs by the face-metre, who pays for the boundary, why drainage decides everything, which material suits your height, and when you cross the over-a-metre line. No sign-up, no sales pitch, just what to ask.
Choosing the right wall
Which material suits your slope and your height, and who pays when a wall holds up a boundary, before you let anyone quote.
Who pays for a boundary retaining wall, me or my neighbour?
A retaining wall is not a shared boundary structure split 50/50 between neighbours. As a general rule in South Australia, under the Planning, Development and Infrastructure Act, the wall is the responsibility of the owner whose land it holds up, that is, whoever cut or filled the ground, and the cost follows who benefits. How the responsibility usually falls, in plain English. General guidance, not legal advice.
Read the guide →Besser block or sleeper, which retaining wall?
Timber sleeper is the budget option for a low garden terrace, concrete sleeper is the volume product for most boundary and sloped-block walls, and core-filled besser is the engineered premium for tall or surcharge-loaded walls that have to be certified. A straight comparison on strength, height, cost and the footing each one needs.
Read the guide →Pricing and quotes
What a retaining wall is worth by the face-metre, how to read a quote, and the footing and drainage lines a cheap quote leaves off.
How the work is done
When a wall crosses the over-1m line that needs an engineer and council, how long it takes, and the standards behind it.
Do I need council approval for a retaining wall?
In South Australia a wall retaining a metre or less usually does not need development approval. Once it retains over a metre, or carries a surcharge like a driveway or a building above it, it normally needs a structural engineer design and council development approval. How the over-1m trigger works and how we handle it.
Read the guide →How long does it take to build a retaining wall?
A straightforward garden wall under a metre is often a two to four day job once we start: excavate and set the footings, lay the ag-line and aggregate, build the wall, then backfill and finish. A taller engineered wall, a long boundary, or a tight sloping block takes longer, and the engineer design and council approval add lead time before we dig.
Read the guide →Why walls last or fail
Why drainage decides whether a wall stands or bulges, and what the structural warranty actually covers.
The Honest Retaining Wall Cost Guide
What is inside
- Real by-the-face-metre bands for timber, concrete sleeper, link-block, gabion, besser and stone
- The costs a cheap wall quote quietly leaves out, the footing and the drainage
- When a wall crosses the over-1m line that needs an engineer and council approval
- How the cost usually falls when a wall holds up a neighbour boundary
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