Retaining Wall Cost Calculator
Get an indicative cost range for your Perth retaining wall, and a flag on whether the WA 0.5 m building-permit threshold applies to your project.
Retaining Walls Perth Cost Estimator
Limestone block (cut or reconstituted stone) and post and panel (galvanised steel posts with concrete panels) are Perth's two most common systems.
Estimated cost range
$2,000 - $4,800
Indicative only - excludes GST, excavation, drainage, backfill, engineering and difficult access.
How this is calculated
What this is: an indicative installed-cost range for your wall face area (height x length), based on published Perth material cost bands. It is not a quote, and it does not include excavation, drainage, backfill, engineering or difficult-access costs.
The method: wall face area (height x length, in square metres) is multiplied by the low and high end of the selected material's published cost-per- square-metre band to produce a range.
Sources: limestone $250-$600/m2 (bodabuildinggroup.com.au Perth retaining wall cost guide), concrete post and panel/sleeper $250-$500/m2 (retainingwallbuildersperth.com.au), timber sleeper $150-$350/m2 (retainingwallbuildersperth.com.au). Building permit threshold per wa.gov.au and Building Regulations 2012 (WA) Schedule 4.
Assumptions: holds material cost-per-square-metre constant regardless of site access, excavation difficulty or rock depth; ignores drainage, backfill, engineering and permit fees entirely; does not account for tiered/stepped wall height aggregation rules some councils apply.