How Much Does Stormwater Drainage Cost in Australia (2026)?
Quick Answer
Stormwater drainage costs $2,000–$15,000+ for a full system. Ag pipe (subsoil): $50–$100/m installed. PVC pit and pipe: $150–$300/m. Charged gully/downpipe connection: $300–$600 each.
Stormwater Drainage Costs
| Component | Cost | Notes |
|---|---|---|
| Ag pipe (subsoil drainage) | $50–$100/m | Includes gravel surround and geofabric |
| PVC stormwater pipe (90mm) | $80–$150/m | Supply, excavation, install, backfill |
| Stormwater pit (grated) | $400–$800 each | Supply and install |
| Charged gully connection | $300–$600 | Downpipe to underground |
| Connection to council main | $1,000–$3,000 | Includes council fees |
| Soak well / absorption trench | $800–$2,000 | Where no council connection available |
When is Stormwater Work Required?
- New builds: All new homes require a stormwater management plan
- Extensions/renovations: Additional roof area requires additional stormwater capacity
- Flooding issues: Existing properties with drainage problems
- Driveway/paving: New impervious surfaces need drainage solutions
Compliance
Stormwater drainage is notifiable work in QLD. You must comply with AS/NZS 3500.3 (Stormwater Drainage) and lodge a Form 7. Council may also require a stormwater management plan for larger projects.
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