Find Plumbing and Drainage Subcontractors in Australia

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Plumbing is licensed more narrowly than most people engaging it realise. A plumber’s licence, a drainer’s licence and a gasfitter licence are three separate authorisations, and holding one says nothing about the others.

This page covers what gets subcontracted in this sector, the credentials worth confirming, and how a job runs on Workforce Marketplace. Early access is open.

What gets subcontracted

The work that most often moves between businesses covers:

Commercial and industrial rough-in and fit-off against a builder programme
Hydraulic services on new build and refurbishment
Drainage, stormwater and sewer connection work
Gasfitting, including hot water systems and commercial kitchen connections
Roof plumbing, guttering and rainwater systems
Backflow prevention testing and thermostatic mixing valve servicing
Maintenance contracts across a portfolio of sites, and after-hours breakdown response

Credentials that matter here

Licensing sits with the state plumbing regulator, which in most states is the same body that licenses builders. The classes to check are:

Plumber’s Licence, through the state plumbing regulator: NSW Fair Trading, the VBA in Victoria, the QBCC in Queensland
Drainer’s Licence, separate from the plumber’s licence and required for sewer and stormwater drainage
Gasfitter Licence, separate again, and required before anyone touches a gas appliance or line
Roof Plumber Licence where the scope includes roofing, guttering or rainwater goods
White Card for any construction site, plus Confined Space Entry and Working at Heights where the scope calls for them

The distinction that catches businesses out is contractor versus worker. A licensed plumber employed by someone else cannot lawfully contract for the work in their own right without the contractor class of licence. Check the licence class and the name it is issued in, not just that a licence exists.

What to confirm before work starts

An active ABN. Where a supplier does not quote one, you are generally required to withhold 47 per cent of the payment and remit it to the ATO. Their GST registration also tells you whether the price should carry it.

That the credential is held by the entity you are contracting with. A person can hold a qualification while the business you are paying holds nothing. Check the name on the document against the name on the invoice.

Insurance appropriate to the scope. Public liability is the common one. Depending on the work you may also need professional indemnity, and workers compensation if they carry their own staff.

That the engagement is genuinely a contract for services. Since the Fair Work amendments the test looks at the real substance of the relationship rather than the label on the paperwork, and getting it wrong creates back-pay, superannuation and payroll tax exposure. Contractor vs employee in Australia sets out how it now works.

Writing a scope that gets comparable quotes

Plumbing quotes diverge on things that are easy to leave out of a scope. Whether the existing services have been located and proved, whether the building is occupied and isolations need staging, who cuts and makes good, the fixture schedule and who supplies it, whether certification and as-built drawings are included, and what the response time is on a maintenance contract. Say which of those you are asking for and the quotes become comparable.

How it works on Workforce Marketplace

Post the scope with the payment structure it actually uses, whether that is fixed price, hourly, daily, quoted or split into milestones for staged work. Subcontractors apply, and you compare them side by side rather than chasing callbacks.

Every account is ABN-verified at sign-up. Beyond that, subcontractors can submit licences, certifications and insurance for verification, which we review rather than grant automatically. Their profile shows the status against each credential without showing the document, the licence number or the ABN. Verification is opt-in, so a profile may hold credentials that have not been submitted, and it reflects the document as at the date it was reviewed rather than standing indefinitely.

Applying for work costs nothing and there are no leads to buy. Payment runs through Stripe, and Workforce Marketplace never stores your card or bank details.