Civil plumbing in Queensland: the knowledge hub
Civil plumbing covers the buried water, sewer, drainage and stormwater infrastructure connecting a building to public networks. In Queensland that work is governed by the Plumbing and Drainage Act 2018, AS/NZS 3500 and the standards of the local water service provider. These guides explain how it is approved, priced, built and repaired.
Six topic guides · Written by JMP Group, Capalaba QLD · Last reviewed September 2026
Start here
Three answers most enquiries begin with
What is a civil plumber?
A civil plumber installs and maintains underground water, sewer, drainage and stormwater infrastructure between a building and the public network. The trade holds plumbing licensing, works to AS/NZS 3500 and operates excavation plant, which separates it from both domestic plumbing and general earthmoving.
Who owns the pipe that failed?
The property owner maintains the sanitary drain from the building's fixtures to the connection point on the authority's sewer main, along with water pipework downstream of the meter. The main itself belongs to the water service provider. CCTV footage establishes which side a defect sits on.
Which approval does my job need?
Queensland sorts plumbing work into permit-exempt, notifiable and compliance-assessable categories. New or altered sanitary drainage is compliance assessable: it needs council approval before work starts, inspection at hold points and a final certificate.
Topic guides
Six subjects, each taken to the bottom
Who owns which pipe on a Queensland property
Where responsibility changes hands for sewer, water and stormwater, how body corporate common property differs, and what evidence settles a dispute.
- Connection point and boundary trap explained
- Water meter as the ownership split
- Easements and shared drainage lines
Plumbing and drainage approvals in Queensland
The three categories of plumbing work, who signs off, which inspections apply and what happens when a hold point is missed.
- Permit-exempt, notifiable, compliance assessable
- Water authority connection applications
- Road opening permits and traffic control
What drives the cost of underground work
The six variables that set a civil plumbing price, how to read a quote's inclusions, and where variations come from.
- Depth, ground, services, surface, access, approvals
- Rock clauses and how they are measured
- Comparing quotes that look different on paper
Blocked, cracked and collapsed drains
How drains fail, what the camera looks for, and the decision between a section repair, a reline and full replacement.
- Symptom-to-cause diagnosis table
- Tree roots, old earthenware and clay movement
- What insurers and body corporates ask for
Stormwater rules, discharge and detention
Lawful point of discharge, on-site detention, inter-allotment drainage, overland flow and the neighbour disputes they cause.
- QDC roof and allotment drainage requirements
- Why detention tanks are conditioned on approvals
- Fixing a yard that floods after development
Trenching, service strikes and backfill
The 1.5 metre rule, shoring and benching, Before You Dig searches, and why compaction decides whether your driveway sinks.
- Queensland WHS excavation duties
- Locating live services before the bucket moves
- Bedding, overlay and layered compaction
Pick your situation
Where to start, depending on why you are here
Homeowner with a problem
Start with what the drain is doing, then establish whose pipe it is before agreeing to any repair.
Builder or developer
Approvals and inspection lead times shape the program more than the excavation ever does.
Body corporate or property manager
Recurring blockages need evidence a committee can approve spending against.
Plumber or contractor
The machine side: trench support, service location, backfill standards and rock measurement.
Reference
Who approves what, by region
The water service provider and the local government are separate roles, and in some regions the same organisation performs both. This table is the short answer to "who do I lodge with".
| Region | Water & sewer | Plumbing approval & stormwater |
|---|---|---|
| Brisbane | Urban Utilities | Brisbane City Council |
| Redlands & Bayside | Redland City Council | Redland City Council |
| Logan | Logan Water (Logan City Council) | Logan City Council |
| Ipswich | Urban Utilities | Ipswich City Council |
| Gold Coast | City of Gold Coast | City of Gold Coast |
| Sunshine Coast | Unitywater | Sunshine Coast Council or Noosa Council |
| Toowoomba | Toowoomba Regional Council | Toowoomba Regional Council |
Confirm the current process with the authority before lodging: service areas and application systems change. Regional detail and ground conditions.
Glossary
Terms that appear on drawings and approvals
- Connection point
- The location where private pipework meets the water service provider's asset. Responsibility for maintenance changes hands here.
- Sanitary drain
- The private underground pipework carrying wastewater from a building's fixtures to the connection point. Owned and maintained by the property owner.
- Invert level
- The internal base level of a pipe or pit. Differences between inverts create the fall that makes a gravity system flow.
- Overflow relief gully
- An external grated outlet set below floor level so a blocked drain surcharges outside the building rather than through a fixture.
- Lawful point of discharge
- The location local government accepts stormwater leaving a property: a kerb, a council drainage pipe or a drainage easement.
- On-site detention
- Storage that holds part of a storm and releases it slowly, so a developed site discharges no faster than it did before development.
- Notifiable work
- A category of Queensland plumbing work a licensee may perform without prior approval, then notify to the QBCC after completion.
- As-constructed
- The record of what was actually built: positions, depths and levels of installed pipework, marked up against the approved design.
- Trench support
- Shields, boxes, shoring or battered walls that stop an excavation collapsing on the people working inside it.
A question these guides do not answer?
Call and describe the site. Answers that turn out to be useful to other people end up on this hub.