Updated October 2026
Mount Nasura sits between the plain and the scarp on the Armadale side, so blocks here tend to step rather than fall away hard. We connect you with retaining wall builders who cover the 6112 area.
Common wall situations in Mount Nasura
Mid-slope suburban work: terracing a yard into levels, driveway and crossover edges, pool surrounds, pad levelling, and replacing walls built decades ago without drainage behind them. Where a wall holds a level difference at a boundary, that is a permit job at any height and needs the neighbour's consent or another authority before anything starts.
Whether your block is on reticulated sewerage or running its own system is worth establishing before a machine arrives, because where a tank, leach drains or an irrigation area sit decides where the wall line can go, where spoil can be stacked and where its drainage can discharge. Your local government holds the records for your address.
The ground under Mount Nasura
Rock, not sand, is what decides a price here. The City of Kalamunda has it in writing that hard granite sits close to the surface across the Hills and is costly to dig through, which is exactly the problem a post hole or an engineered footing runs into. Rock drilling or coring takes longer and costs more, and it is the most common reason a Hills quote reads above the Perth average.
Water is the failure mode. On ground where rock stops it draining down, it runs along the rock until it finds the back of a wall. A quote that does not itemise ag-pipe, gravel backfill, fabric and a discharge point is a cheaper wall that fails sooner.
What a wall costs in Mount Nasura
Guide pricing only: roughly $200 per metre at the timber end up to $700 or more per metre for stone and engineered block, for a wall about a metre high, from published Australian cost guides. Ground conditions and access move it more here than almost anywhere. See the retaining wall cost guide.
Approval, and who to ask in Mount Nasura
Approval in WA turns on 500mm of retained ground, not on the height of the wall, and the exemption only applies where the wall is also clear of other building work and is not holding up or affecting the land next door. All three have to be true at once. A wall on or at a boundary is dealt with separately under the Building Act and needs the neighbour's consent or another authority whatever its height. Development approval under the local planning scheme can apply as well, so confirm the position with the City of Armadale before anything is quoted.
Who is allowed to build it is a statutory question in WA, and it turns on how the work is classified under the building legislation rather than on a figure you can look up and apply yourself. We are not going to settle that on a web page. What is worth doing is simple: ask the builder what registration or licence they hold, check it with Building and Energy, and ask your permit authority what your particular wall requires before you sign anything. Before any digging, your builder should lodge a free Before You Dig Australia (BYDA) enquiry so underground services are located.
Frequently asked questions
Is Mount Nasura in the hills or on the plain?
In between, on the Armadale side where the ground starts to rise toward the scarp. The steep localities above it are Roleystone and Bedfordale. The level suburbia is below.
What does a mid-slope wall usually cost?
Published Australian guide figures put a wall about a metre high between roughly $200 and $700 or more per metre depending on material. Ground conditions and access move it, so a site quote is the only real number.
Which council covers it?
The City of Armadale, which is your permit authority for a retaining wall.
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We also cover nearby Mount Richon and Roleystone.