Retaining walls in the City of Melton
Updated November 2026
A retaining wall holds back soil that would otherwise slump, and most of the work you pay for is the part you cannot see: the footing, the drainage and the backfill. In the City of Melton the walls are usually along cut boundaries on new lots, under raised garden beds, or replacing timber walls that have rotted. We pass your request to a local landscaper who works your suburb. We are a referral service, not a landscaping business.
Wall types
- Timber sleeper. The cheapest to build and the shortest-lived. Good for low garden walls.
- Concrete sleeper. Steel posts set in concrete with concrete sleepers between them. Nothing to rot, and a common replacement for old timber walls.
- Block. Core-filled masonry on a concrete footing, or interlocking segmental block. Block is often the answer for taller walls and walls carrying a load.
- Stone. Natural stone or sandstone, for looks as much as strength.
Drainage behind the wall
Water is what pushes walls over. A wall should have free-draining gravel behind it, a slotted drainage pipe at the base, and somewhere for that water to go. The basalt clays of Melbourne's west hold water and shrink and swell with the seasons, which engineers describe as damaging to light structures. A wall without drainage on clay is a wall that leans. Falls and drainage have to send water somewhere legal, not into a neighbour's yard.
Permits, engineering and boundaries
Whether a retaining wall needs a building permit in Victoria depends on its height, what it is carrying and where it sits, and those rules are in the Building Regulations 2018. Councils and registered building surveyors apply them. A wall carrying a driveway, pool, building or boundary load generally needs engineering. A wall on or near a boundary can trigger protection work requirements under the Building Act 1993, and your neighbour may need to be involved.
Retaining walls are structural landscaping. Under a domestic building contract worth more than $10,000 the work must be carried out by a practitioner registered with the Building and Plumbing Commission. Ask who is registered before you sign.
What a wall costs
Melbourne guide figures for a wall about 1 m high, per lineal metre, ex GST:
- Timber sleeper: about $190 to $425
- Concrete sleeper: about $235 to $575
- Block: about $285 to $720
- Sandstone, including footings: about $320 to $635
These are not quotes from City of Melton landscapers. Excavation, rock, spoil removal, access, engineering and permits all move the price. See the cost guide.
Before anyone digs
The landscaper should lodge a free Before You Dig Australia (BYDA) enquiry before excavation. If the wall is near a pool, ask for the barrier to be checked against Victoria's barrier rules, because a wall or raised bed can become a climbable object.
Frequently asked questions
Do I need a permit for a retaining wall in Victoria?
It depends on the wall's height, what it is carrying and where it sits. The rules are in the Building Regulations 2018, and your council or a registered building surveyor can tell you. The landscaper should say in writing whether your wall needs one.
Why did my timber wall fail?
Usually rot at the posts, no drainage behind it, or a load it was not built for. Replacing it like for like can repeat the problem, so ask what will be different this time.
Who pays for a wall on the boundary?
It depends on whose ground is being held up and why. Talk to your neighbour early, and ask the landscaper or a building surveyor about protection work requirements before anything is built.
Concrete sleeper or block?
Concrete sleepers are quicker and usually cheaper for moderate garden walls. Block often suits taller walls or walls carrying a load. The landscaper quoting your job should explain the choice for your site.