How much does stormwater drain installation cost in Melbourne? (2026)

If your yard floods every winter or rainwater pools against your slab, you almost certainly have a stormwater problem — not a roofing one. Most Melbourne homeowners we visit are shocked at how much damage a few hours of heavy rain can do when the system underneath the lawn was never sized properly.

Below is exactly what stormwater drainage costs to install or upgrade in 2026, what drives the price up or down, and the three mistakes that turn a $4,000 job into a $14,000 one.

Typical stormwater pricing in Melbourne

Stormwater jobs are quoted by linear metre plus the connections (pits, agi-drains, charged lines, council tap-ins). A small fix — like extending one downpipe to the kerb — is often under $900. A full property re-drain with multiple downpipes, surface pits and a Legal Point of Discharge (LPOD) connection is a much bigger job.

These ranges assume standard residential access. Steep blocks, rock, or jobs requiring an engineer add 15–40%.

Scope	Typical 2026 price	Notes
Single downpipe extension to kerb	$650 – $1,200	Up to 6m, grass reinstated
Replace blocked stormwater section	$1,400 – $2,800	Per 8–12m section
New rear yard pit + agi-drain	$1,800 – $3,500	Includes 6–10m of agi
Full property re-drain (3-bed)	$6,500 – $14,500	Multiple DPs, pits, LPOD
Council main connection	+$1,200 – $3,500	Permit, traffic, after-hours
Charged stormwater system	+$1,500 – $4,000	For tank or LPOD below grade

What drives the price up

Length of trench. Every metre of trench needs digging, bedding, pipe, backfill and reinstatement. Long runs from rear downpipes to the street kerb add up fast.

Depth and obstacles. Concrete paths, paving and tree roots all slow excavation. A 600mm-deep trench through grass costs a fraction of the same trench through pavers.

Connection point. Connecting to a council kerb outlet is cheaper than tapping into a council stormwater main (which usually requires a permit, a tapping fee and an out-of-hours connection).

Surface water management. Adding agi-drains, spoon drains, channel grates or sumps adds materials and labour but often saves the foundation.

Sample quotes from real Melbourne jobs

Numbers below are real recent jobs (suburb, scope and 2026 quote). Use them as a sanity check — but always get a written quote for your specific property.

Property	Scope	Quoted price
Brunswick weatherboard	2 DPs to kerb, 14m total	$2,950
Glen Waverley brick	Rear pit + 18m agi + new LPOD	$5,400
Brighton renovation	Full re-drain, 4 DPs, charged line	$11,800
Reservoir flat block	Spoon drain + 8m relay	$3,200

How to avoid the three most expensive mistakes

1. Skipping the LPOD check. Council requires stormwater to discharge to a legal point. Installing without confirming LPOD often means re-doing the work.

2. Undersizing pipes. 90mm PVC is fine for a single downpipe; for combined runs you usually need 100mm or 150mm. Undersized pipes overflow and damage slabs.

3. Connecting to sewer. It's illegal in Victoria and risks heavy council penalties.

What we include in our stormwater quote

Every J.O. Plumbing stormwater quote is itemised with: linear metres of trenching, pipe size and material, number and type of pits, LPOD details, reinstatement (concrete/turf/pavers), council fees and a written 12-month workmanship warranty.

Frequently asked

Q. Do I need a permit for stormwater work?

For internal works on your block, usually no. For a new connection to a council asset (kerb or main), yes — your plumber lodges this and the fee is typically $250–$650 plus inspection.

Q. Will my insurer pay for stormwater damage?

Sudden storm damage to belongings is usually covered. Pre-existing drainage failure is almost never covered. Document everything and get a CCTV report before lodging.

Q. How long does the work take?

A simple downpipe extension is half a day. A full property re-drain typically takes 2–4 days including concrete reinstatement curing time.

### CALL TO ACTION

Suspect a stormwater problem before next winter? Book a $295 site assessment — fully credited toward any work over $1,500. Call 0411 234 567 or request a quote at joplumbing.com.au.