Drainers install, maintain, and repair stormwater drainage, sewer drainage, and sub-soil drainage systems for residential, commercial, and civil projects across Australia. While plumbers handle water supply and internal sanitary plumbing, drainers specialise in the below-ground pipe systems that carry wastewater to the sewer main and stormwater to the street or waterway. In many states, drainage is a separate licence class from plumbing — for example, QBCC issues a "Drainer" licence distinct from the plumber licence, and NSW requires a Drainer licence from NSW Fair Trading. Homeowners most commonly engage a drainer for blocked sewer lines, stormwater drainage for new buildings, sub-soil (agricultural) drainage to manage waterlogged yards, sewer connection and disconnection, CCTV pipe inspections, pipe relining, and stormwater detention system installation as required by council.

Queensland Building and Construction Commission — Regulatory Overview

Queensland Building and Construction Commission is Queensland's principal regulator for the building and construction industry, responsible for licensing all drainers who perform regulated work in the state. The QBCC issues and renews licences, sets minimum requirements for licensees, investigates complaints, and takes disciplinary action against non-compliant operators.

As of February 2026, Queensland Building and Construction Commission oversees 183 licensed drainers across Queensland, covering 2 licence classes. This represents one of the most comprehensive licensing regimes in Australia, designed to protect consumers and maintain industry standards.

Penalties for Unlicensed Work

Performing unlicensed drainer work in Queensland carries significant fines. Homeowners who engage unlicensed drainers lose access to statutory consumer protections and may face voided insurance, failed inspections, and other consequences.

How to Verify a Drainer in Queensland

Verifying a drainer's licence in Queensland is straightforward and should be done before engaging any tradesperson for work. You can use TradieVerify's free search tool to instantly look up any Queenslanddrainer by name, licence number, or business name. Alternatively, you can search directly through Queensland Building and Construction Commission at https://www.qbcc.qld.gov.au.

When verifying, confirm: (1) the licence is current and active, (2) the licence class covers the type of work you need, (3) there are no conditions or restrictions on their licence, and (4) there is no disciplinary history. A legitimate drainer will have no hesitation providing their licence number for verification.

How to Hire a Drainer in Queensland

1
Confirm they hold a specific drainage licence, not just a plumbing licence
In Queensland, NSW, and several other states, drainage work requires a separate Drainer licence. A plumber licensed only for water supply and sanitary plumbing may not be authorised to perform drainage work. Check the licence class on your state regulator's website. In some states (e.g. Victoria), plumbing registration covers drainage, but in others, it does not.
2
Ask for a CCTV inspection before committing to major drainage repairs
A CCTV pipe inspection (using a camera inserted into the drain) provides video evidence of the exact location and nature of the problem — tree root intrusion, cracked pipes, joint displacement, or bellied sections. A drainer who recommends excavating and replacing pipes without first performing a CCTV inspection may be recommending more work than is needed. CCTV inspections typically cost $200–$500.
3
Check whether they can provide pipe relining as an alternative to excavation
Pipe relining installs a resin-impregnated liner inside the existing pipe, creating a new pipe within the old one — without excavation. This method is faster, less disruptive, and often cheaper than traditional dig-and-replace for damaged sewer and stormwater pipes. Not all drainers offer relining. If your drainage problem can be solved with relining, ask whether the drainer is trained and equipped for it.
4
Ask about council requirements for stormwater detention or OSD
Many Australian councils require new buildings and significant renovations to install an On-Site Stormwater Detention (OSD) system to limit stormwater runoff. The drainer should be familiar with your council's OSD requirements, including permitted discharge rates and detention tank sizing. Non-compliant stormwater systems can result in failed council inspections and costly rectification.
5
Get clarity on the depth and location of existing services before excavation
Drainage excavation often occurs near other buried services — water mains, gas lines, electrical cables, and telecommunications. A competent drainer will request a Dial Before You Dig (DBYD) report and use a service locator before excavating. Hitting a gas main or electrical cable during drainage excavation is dangerous and expensive.

Red Flags When Hiring a Drainer

Recommends excavation without a CCTV inspection first:A drainer who jumps straight to "we need to dig up your yard" without first inspecting the pipe with a CCTV camera may be recommending unnecessary work. CCTV inspection is a standard diagnostic tool that costs $200–$500 and can save thousands by identifying the exact problem location and whether relining is a viable alternative to excavation.
Does not hold a specific drainage licence:In states where drainage is a separate licence class (e.g. Queensland, NSW), performing drainage work without the correct licence is illegal. Unlicensed drainage work may not be covered by home warranty insurance and may not be accepted by council or your water authority for compliance certificates.
Does not call Dial Before You Dig before excavating:Dial Before You Dig (DBYD) provides information on the location of underground services (gas, electricity, water, telecommunications). Excavating without a DBYD report is reckless and can result in hitting a gas main, electrical cable, or water main — causing service outages, property damage, and potentially fatal injuries. A competent drainer always orders a DBYD report before any excavation.

Typical Drainer Costs in Queensland

Hourly Rate

$80 – $130

Callout Fee

$70 – $120

Common Drainer Jobs & Estimated Costs

Job	Estimated Cost
Blocked drain clearing (CCTV + jet)	$200 – $600
Stormwater drain installation	$1,500 – $5,000
Sewer line repair or replacement	$2,000 – $8,000
Drainage pit installation	$500 – $1,500
French drain installation	$1,000 – $3,500

Drainer Complaints & Disputes in Queensland

Queensland Building and Construction Commission (QBCC)

139 333 Website

How to Lodge a Complaint

1Write to the tradesperson detailing the issue and requesting rectification within a reasonable timeframe (usually 14 days)
2If unresolved, lodge a complaint online via the QBCC website or call 139 333
3QBCC will assess the complaint and may arrange an inspection
4If the complaint is substantiated, QBCC can issue a direction to rectify the work
5If the tradesperson fails to comply, QBCC may take disciplinary action or use its insurance fund to cover rectification

Frequently Asked Questions

How much does it cost to fix a blocked drain in Australia?

A simple drain unblock using an electric eel or high-pressure water jetter typically costs $150–$400. If the blockage is caused by tree roots or a collapsed pipe, further investigation (CCTV inspection: $200–$500) and repair may be needed. Pipe relining for a damaged section costs $500–$1,500 per metre. Full excavation and pipe replacement costs $200–$500 per metre plus reinstatement of landscaping, driveways, or concrete. A typical sewer line repair (5–10 metres) costs $2,000–$8,000.

What is the difference between a plumber and a drainer?

A plumber installs and maintains the water supply, hot water, and internal sanitary plumbing (basins, toilets, showers) inside a building. A drainer installs and maintains the below-ground drainage systems that carry wastewater from the building to the sewer main and stormwater from the site to the stormwater system. In some states these are separate licence classes; in others, a plumbing registration covers both. For below-ground pipe work, always confirm the tradesperson holds a drainage licence or endorsement.

How do I know if I have a drainage problem?

Common signs include slow-draining fixtures (sinks, showers, toilets), gurgling sounds from drains when other fixtures are used, sewage odours in the yard or house, patches of unusually green or lush grass over the sewer line (indicating a leak feeding the soil), pooling water in the yard after rain, and rising damp or water stains on lower walls. Recurring blockages in the same drain line are a strong indicator of a structural problem (root intrusion, cracked pipe, or belly) that needs investigation.

How many licensed drainers are there in Queensland?

As of February 2026, there are 183 licensed drainers registered with Queensland Building and Construction Commission in Queensland. This includes all licence classes: Drainage, Drainage - On-site Sewerage Facility.

How do I verify a drainer's licence in Queensland?

You can verify any Queensland drainer's licence using TradieVerify's free search tool or directly through Queensland Building and Construction Commission at https://www.qbcc.qld.gov.au. Enter the drainer's name or licence number to confirm their registration status, licence class, and any disciplinary history.

Licensed Drainers in Queensland

Find Drainers by City

QueenslandDrainer Statistics

Breakdown by Licence Class

Breakdown by Financial Category

Drainer Licensing in Queensland