Short answer: Exchange lists 11 plumbing companies in Queensland. Plumbing is licensed twice over here: an individual needs a plumber or drainer licence from the Queensland Building and Construction Commission, and a business contracting for the work needs a contractor licence on top. Work is classified as permit, notifiable or minor under the Plumbing and Drainage Act 2018, and notifiable work must be certified and lodged within ten business days of completion.
Individual licence
Plumber or drainer licence, in provisional, journeyman and unrestricted grades with endorsements.
Business licence
Contractor licence for the entity contracting above the statutory threshold.
Permit work
New sanitary drainage and on site sewerage: local government permit, inspections, final certificate.
Notifiable work
Form 4 certificate lodged with the Commission within ten business days of completion.
Backflow
Testable devices registered with the local government and tested annually by an endorsed person.
Governing act
Plumbing and Drainage Act 2018.
Plumbers in Queensland
Queensland runs one of the more structured plumbing regimes in Australia. The Queensland Building and Construction Commission licenses the individual tradesperson and, separately, the business that contracts for the work, and the Plumbing and Drainage Act 2018 sorts every job into one of three categories that determine whether a local government permit is needed, whether a form has to be lodged, or whether neither applies.
That classification is the thing a plumber new to the state has to internalise first, because the compliance obligation attaches to the category rather than to the size of the invoice. A modest job can be permit work, and a substantial one can be notifiable, and getting the category wrong is the most common source of enforcement action against otherwise competent contractors.
Two licences: the tradesperson and the business
An individual carrying out plumbing or drainage work needs a plumber or drainer licence, issued in provisional, journeyman and unrestricted grades according to qualification and supervised experience. Endorsements extend the licence into specific areas such as backflow prevention device testing, thermostatic mixing valves, on site sewerage facilities and solar or heat pump hot water installation. Those endorsements are how Queensland controls the higher risk work, and a plumber without the relevant endorsement cannot certify it.
Separately, any business entering into a contract for plumbing work above the statutory threshold needs a contractor licence, which brings with it the Commission's minimum financial requirements: net tangible asset and current ratio tests scaled to revenue category, with annual reporting above the lower categories. A sole trader doing contracted work needs both the trade licence and the contractor licence. The most common structural mistake is a company with well qualified plumbers and no contractor licence of its own.
Licensing and work categories at a glance
Item
Who or what
Trigger
Obligation
Plumber or drainer licence
The individual
Performing plumbing or drainage work
Qualification, supervised experience, grade and endorsements
Contractor licence
The business
Contracting for plumbing work above the threshold
Minimum financial requirements, nominee where required
Permit work
The job
Higher risk or new sanitary drainage and on site sewerage
Local government permit before work, inspections, final certificate
Notifiable work
The job
Defined replacement and alteration work
Form 4 certificate lodged with the Commission within ten business days
Minor work
The job
Repairs and maintenance listed as minor
No permit and no notification, but still licensed work
Home warranty cover
Residential contracts
Residential work above the threshold
Premium paid before work starts
Permit, notifiable and minor work
Permit work is the highest category. It covers new sanitary drainage, on site sewerage facilities and other higher risk work, and it requires a plumbing and drainage permit from the local government before the work starts, inspections during the work and a final certificate at the end. The local government is the authority here rather than the Commission, so the process varies in administration between Brisbane City, the regional councils and the smaller shires even though the standard does not.
Notifiable work is the middle category and the one that generates most of the paperwork. It covers a defined list of replacement and alteration work: replacing fixtures connected to sanitary drainage, altering water services, installing hot water systems and similar. No permit is needed, but the licensed plumber must complete and lodge a Form 4 certificate with the Commission within ten business days of finishing, and must give a copy to the owner. Minor work, largely repairs and maintenance, needs neither, but it still must be done by a licensed person.
The ten business day lodgement is the deadline that catches busy service businesses. It runs from completion of the work rather than from invoicing, it applies per job, and the Commission can and does audit lodgement records. A service plumber doing several notifiable jobs a week needs a process that lodges as part of closing the job, not a monthly catch up.
Backflow, thermostatic valves and testable devices
Queensland requires that testable backflow prevention devices be registered with the local government and tested annually by a licensed person holding the backflow endorsement, with the test results recorded and reported. The same pattern applies to thermostatic mixing valves in healthcare, aged care, childcare and similar settings, which require annual servicing by an endorsed person. Both create an ongoing compliance obligation attached to the building rather than to a one off installation.
Commercially this is one of the better recurring revenue streams available to a Queensland plumbing business, because the obligation is annual, the register is held by the council, and the customer cannot lawfully ignore it. It also carries real risk: a falsified or careless test on a high hazard containment device is a public health matter. Firms that build the annual register properly, with asset records and scheduled visits, tend to hold those clients for years.
Water, rainwater and the Queensland Development Code
Queensland's plumbing technical requirements sit on the national plumbing code as adopted by the state, with Queensland specific provisions layered through the Queensland Development Code. Water savings targets for new residential buildings, rainwater tank provisions and requirements for the connection of tanks to toilets, laundries and external use have been part of that framework since the drought years of the 2000s, and although the specific mandates have changed over time, rainwater tanks remain extremely common across South East Queensland and are frequently a development approval condition rather than an owner preference.
On site sewerage is the other distinctly Queensland technical area, because a very large share of the state is unsewered. On site sewerage facilities need council approval, must use treatment plants approved for use in Queensland, and carry ongoing servicing obligations for aerated systems. A plumber working outside the reticulated networks needs the on site sewerage endorsement and a working relationship with the relevant council's environmental health team.
Climate, corrosion and where the work is
Queensland's conditions shape plumbing choices in ways that matter. The coastal strip has high atmospheric corrosivity from salt, so material selection for exposed pipework, fixings and hot water units has to reflect the corrosivity category of the location rather than a national default. Warm ambient temperatures mean cold water services in roof spaces can arrive at the tap uncomfortably warm and can sit in the bacterial growth range, which is a design consideration for insulation and routing that colder states never confront.
Cyclone regions in the centre and north bring fixing and restraint requirements for tanks, hot water units and roof mounted plant. Flooding is the other recurring event: Brisbane, Ipswich and the Lockyer Valley have flooded repeatedly, and post flood work, including backflow protection, non return valves on sanitary drainage and the reinstatement of on site sewerage systems, is a persistent part of the market.
The bulk of the work sits in South East Queensland, where population growth, high rise residential, hospital and institutional projects and the 2032 Games infrastructure programme have produced sustained demand. Regional centres including Townsville, Cairns, Mackay and Rockhampton carry their own markets tied to resources, ports, defence and tourism, and the resources corridor carries industrial pipework that is a different discipline again, with its own qualification and shutdown scheduling expectations.
Verify a licence and check the source
Every figure and rule on this page can be checked against the primary source. These are the offices that publish them. Confirm current requirements directly before you rely on any of them:
Do I need two licences to run a plumbing business in Queensland?
Usually yes. The individual doing the work needs a plumber or drainer licence, and the business entering the contract needs a contractor licence from the Queensland Building and Construction Commission. A sole trader contracting directly needs both.
What is notifiable plumbing work in Queensland?
A defined category of replacement and alteration work, including replacing fixtures connected to sanitary drainage and installing hot water systems, that needs no permit but requires the licensed plumber to lodge a Form 4 certificate with the Commission within ten business days of completing the work.
When do I need a plumbing permit rather than a notification?
Permit work covers new sanitary drainage, on site sewerage facilities and other higher risk work. It requires a permit from the local government before work starts, inspections during the work and a final certificate at the end.
How often do backflow prevention devices have to be tested in Queensland?
Testable devices must be registered with the local government and tested annually by a licensed person holding the backflow endorsement, with results recorded and reported.
What endorsements can a Queensland plumber hold?
Endorsements cover higher risk areas including backflow prevention device testing, thermostatic mixing valves, on site sewerage facilities and solar or heat pump hot water installation. A plumber cannot certify work in an area they are not endorsed for.
Are rainwater tanks required in Queensland?
Requirements have changed over time and depend on the Queensland Development Code provisions and the local planning conditions applying to the development. Tanks remain very common across South East Queensland and are frequently imposed as a development approval condition.
Why does material selection matter more on the Queensland coast?
Salt laden air gives the coastal strip a high atmospheric corrosivity category, so exposed pipework, fixings, brackets and hot water units need to be specified to that category rather than to a national default, or they fail early.
