By Greg Allan, tradesman and creator of Data First Coaching
Why does a plumbing licence feel like just another compliance cost?
Many plumbing businesses treat a licence renewal, a backflow ticket or a gas fitting authorisation as a fee to pay and a form to lodge, not something that should pay for itself. Customers never see the training behind a backflow test or a hot water system check, so an unexplained quote can read as just another number next to a cheaper, unlicensed one.
A licence lets a plumber see and price work most customers cannot judge themselves, from the condition of a backflow device to whether a hot water system still meets the rules behind a compliance certificate. When the quote never explains any of that, the business has paid for the ticket but not for the pricing power it was meant to bring.
Is a licensed plumber's advantage being used, or given away for free?
On most jobs a licensed plumber can see things an unlicensed person legally cannot: the state of a hot water system, a backflow device, or old drainage behind a strata property's common areas. Many plumbing businesses find that extra work and quote it at the original callout rate, or fold it into the invoice for nothing, instead of pricing it separately.
A blocked drain job that turns into a drain camera inspection, or a bathroom renovation that uncovers rough-in work that will not pass fit-off, is exactly when a licence should earn its keep. Treating that discovery as a favour rather than a quote is a quiet way a plumbing business leaks margin.
What licence do you need to run a plumbing business in Australia?
There is no single national licence for plumbing in Australia. Each state licenses plumbing work itself, usually in two layers: a contractor's licence, or equivalent, that lets your business take on and invoice for plumbing work, and an individual registration or licence that lets the plumber doing the work actually perform and sign off on it. The categories and process differ state to state, so check the regulator where your business operates.
In New South Wales, Fair Trading says you need a licence or certificate for any plumbing, draining or gasfitting work regardless of its cost, and you need to be licensed in every category you work in, or supervised by someone who is (NSW Fair Trading).
In Queensland, the QBCC says you need an occupational licence for plumbing, drainage and gas fitting work regardless of the value of the work or how it is contracted (QBCC).
In Western Australia, the Plumbers Licensing Act 1995 sets out five occupational licences, and a plumbing contractor's licence applicant must already hold a tradesperson's licence and statements of competency as a water supply plumber, sanitary plumber or drainer (WA Plumbers Licensing Board).
In South Australia, Consumer and Business Services says you need a contractor's licence to contract for plumbing work, and you still need your own plumber's registration to physically perform it (CBS SA).
Wherever in Australia your plumbing business is licensed, Greg coaches online and starts from your own numbers, so operating under a different state's system does not change how the coaching runs.
What's the difference between your contractor's licence and your own registration?
A contractor's licence usually lets your plumbing business take on jobs and invoice the customer, while a registration or practitioner licence lets a specific plumber legally do the work and sign off on it. In several states these sit with different people, which matters once you have an apprentice or another plumber working under your name.
In Victoria, the Victorian Building Authority says plumbing accreditation is only granted to individuals, not companies, and each class of plumbing work has two levels: registration, and a licence that also allows supervising apprentices and issuing compliance certificates for supervised work (VBA).
In Tasmania, Consumer, Building and Occupational Services separates a practitioner licence, needed to do the physical work including as an employee, from a contractor licence, needed to sell plumbing services to the public, business or government (CBOS Tasmania).
In NSW, roof plumbing work above a set value in labour and materials also needs a contractor licence, and separate approvals such as the Notice of Work process can sit alongside your plumbing licence for drainage work connecting to council or water infrastructure (NSW roof plumbing, ABLIS Notice of Work).
This is general information, not legal, tax or employment advice. Check your own situation with the body named here or a qualified adviser.
How do you turn that licence into properly priced backflow, gas fitting and compliance work?
The licence lets you see and quote for things a customer cannot judge themselves, so that work should carry its own margin, not get bundled into the original callout for nothing. A backflow test, a gas fitting job or a compliance certificate on a strata maintenance contract needs to be quoted on its own numbers, with a gross profit margin you actually know.
Picture a plumber running bathroom renovations and backflow device installs, where quoting was slow and manual and every job had dozens of small parts. With that much on each quote it was easy for a bracket, a post or a fitting to be left off, missing on site while someone drove back to the supplier. A quoting template built around a checklist for each type of job, covering every material down to the brackets and posts, closed that gap and meant the quote matched what actually went in the van.
Knowing the gross profit margin on a backflow test or a gas fitting job, rather than guessing from memory, is what lets a plumbing business price its most specialised work properly instead of quietly discounting it to look competitive. That is a data first way of quoting, built from the job's own materials, labour and margin.
This is where AI agents can take over work that eats time without adding value. An AI agent is software that does a job the way you would do it yourself, using your prices, your wording and your rules, so it can build a quote from your own checklist or chase the paperwork behind a compliance certificate. AI agents do not set your price or your margin, they carry the admin around it.
Where can you check the current rules?
- NSW Fair Trading: plumbing, draining and gasfitting licences covers licence and certificate types for plumbing work in New South Wales.
- NSW Fair Trading: roof plumbing licences covers when roof plumbing needs a residential building contractor licence.
- ABLIS: Notice of Work, plumbing and drainage, NSW covers council and water authority approvals alongside your plumbing licence.
- Victorian Building Authority: plumbing registrations and licences covers the difference between registration and licence in Victoria.
- QBCC: when you need a licence covers occupational licensing for plumbing and gas fitting in Queensland.
- WA Plumbers Licensing Board: Form 101 covers the plumbing contractor's licence application in Western Australia.
- CBOS Tasmania: plumbing practitioner and contractor licences covers the difference between a practitioner and a contractor licence in Tasmania.
- CBS South Australia: working as a plumber in SA covers contractor's licences and registration for interstate and local plumbers in South Australia.
How does Data First Coaching approach this?
Data First Coaching does not start by asking which licence a plumber holds. It starts by looking at the business's own quotes and invoices to see whether specialised work, backflow testing, gas fitting, compliance certificates on strata and maintenance contracts, is priced with a known margin or squeezed into the nearest existing rate. The Trade Business Intelligence reads that job and finance data alongside ten years of coaching trade businesses to find where the pricing gap really starts. Greg Allan puts it plainly: “it's a value-based sale and we want to make sure that they understand the amount of work.” The how is worked through inside the Academy, with members, because the Trade Business Intelligence is powered by every member, for every member, and the Academy is for owners open minded and willing to share what they learn.
Looking for a business coach who starts from your numbers? Plumber Business Coach or every answer for plumbers.
