Stormwater Cost in Perth (2026)
Perth's sandy, free-draining soil is the one city where stormwater often soaks away on site.
Your stormwater cost details
Measure from the downpipes or problem area to the legal discharge point.
Reinstatement of the surface is often as expensive as the pipe itself.
Junctions, changes of direction and surface collection points each need a pit.
Your estimate sits within the typical range.
Get a dial-before-you-dig plan before any excavation. It is free, it is a legal expectation before ground disturbance in Australia, and striking a gas, telecommunications or electrical service turns a $4,000 job into a very expensive incident.
💰 Ways to save
- Do the earthworks while other excavation is already happening on site. If you are having a pool dug, a shed slab poured, a retaining wall built or landscaping done, the excavator, the operator and the site access are already mobilised and paid for. Adding stormwater trenching to that program commonly saves $600 to $1,500 in machine hire and mobilisation compared with bringing a machine back specifically for drainage.
- Solve the cause before you buy capacity. A great many stormwater complaints in Australian suburbs are not undersized pipe, they are blocked gutters, a downpipe disconnected from the drain, a sagging gutter, a driveway falling toward the house, or a garden bed built up above the weep holes. A $350 CCTV inspection and an honest look at the surface levels can turn a proposed $8,000 drainage upgrade into a $600 fix.
- Reinstate the surface yourself where you reasonably can. Trenching through lawn is cheap, but topsoil, turf and garden restoration often adds $25 to $60 per metre to a quote. Ask the contractor to backfill and compact properly and leave the finish to you, then lay your own turf or mulch. Do not do this where the trench crosses concrete or paving, because a poor reinstatement there causes settlement and cracking.
- Check whether your council allows on-site infiltration such as soakwells before you assume you need a connection to the main. In much of Perth and parts of South Australia, soakwells are the standard and legal method and are considerably cheaper than a kerb or main connection. In clay-heavy parts of Sydney, Melbourne and Brisbane they often will not be accepted, so confirm early rather than after the pipe is in the ground.
or from $19/week over 5 years , indicative finance
How we estimate this
## What stormwater drainage costs in Australia
Pricing reviewed: June 2026.
What a stormwater costs in Perth
Perth's sandy soils are the defining factor and they work in the owner's favour: the ground is quick and cheap to excavate, and it drains so freely that stormwater is frequently managed with soak wells on the property rather than piped all the way to the street, which can make a Perth stormwater solution simpler and cheaper than in the clay-bound eastern cities. The easy digging keeps the labour component down despite rates near the national average.
The design still has to suit the block: where sand gives way to limestone, excavation is harder and slower and can need special equipment, and low-lying or clay-pocket sites need a proper piped solution. The dry Mediterranean climate means intense rainfall is less frequent than in the subtropics, so capacity sizing is less demanding, and soak wells are the common local answer where the sand allows it.
Compare against the national picture: Stormwater Cost in Australia →
Stormwater Cost in other cities
Frequently asked questions
How much does stormwater drainage cost per metre in Australia?
Typically $90 to $160 per metre through lawn or garden in 2026, including excavation, pipe, bedding, backfill and basic reinstatement. Cutting through concrete adds $80 to $150 per metre, and running under a driveway is the most expensive scenario.
What does a full property stormwater upgrade cost?
Connecting a few downpipes to an existing street outlet usually costs $1,500 to $4,000. A complete re-drain with a new council main connection, multiple pits and surface reinstatement commonly runs $8,000 to $18,000.
Do I need council approval for stormwater work?
For a connection to a council stormwater main, almost always. Expect an application, an approved drainage plan and an inspection before backfill, with fees of $300 to $900 and a four to eight week lead time. Requirements vary by council, so confirm locally before quoting.
What fall does a stormwater pipe need?
The usual minimum residential grade in Australia is 1 in 100, or a 10mm drop per metre of run. Less fall than that lets water and silt sit in the line, which is the most common reason a newly installed system still floods.
Do I need a licensed plumber for stormwater?
Yes. Stormwater drainage is licensed plumbing work in every Australian state and territory, and connections to council infrastructure require a compliance certificate. Unlicensed drainage work creates problems at sale and can jeopardise a flood insurance claim.
How much does a soakwell cost?
Supplied and installed, soakwells typically cost $400 to $900 each depending on diameter, depth and access. They are standard practice in sandy soils such as much of Perth, but many clay-soil councils on the east coast will not accept them as the discharge method.