How to Choose a Plumber in Australia

The honest 8-step checklist. No fluff, no upsell — just the questions and checks that separate a plumber who'll fix your problem from one who'll create three new ones.

The 8-step checklist

1. 1. Check they're actually licensed

   Every plumber in Australia needs a current state-issued licence. In Queensland it's the QBCC, in Victoria it's the VBA (Victorian Building Authority), in NSW it's NSW Fair Trading, in SA it's CBS, and in WA it's the Plumbers Licensing Board. Don't take their word for it — every single one of those bodies has a free public licence lookup. Type the plumber's name or licence number into the register before you let them quote. If the licence has lapsed, expired, or is restricted to a class of work that doesn't cover your job (e.g. drainage vs gas vs roofing plumbing), walk away. An unlicensed plumber voids your home insurance the moment something leaks.

2. 2. Ask for a fixed quote, not hourly

   For 90% of residential jobs — a hot water system swap, a leaking tap, a blocked drain, a toilet replacement — a good plumber can give you a fixed price after a quick site look or even photos sent through. Hourly is only acceptable when the scope genuinely can't be known up front (think: opening a wall to chase a slow leak, or unblocking a drain where the cause is unknown). If a plumber refuses to fixed-quote a $400 hot water valve replacement, that's a flag they're hoping the meter runs. Always get the quote in writing with materials, labour, callout fee, GST and disposal costs broken out.

3. 3. Check they carry public liability insurance

   $5 million is the bare minimum you should accept for residential work, and most decent plumbers carry $10–20M. Ask for a Certificate of Currency (it's a one-page PDF from their insurer) and check the expiry date. If a plumber floods your kitchen, blows a gas line, or causes water damage to a downstairs neighbour's apartment, that policy is what stands between you and a six-figure bill. No certificate, no job.

4. 4. Read Google reviews properly

   Star count is the laziest signal. What you actually want to look at is how the business owner responds to the bad reviews. A plumber who replies calmly, takes ownership, and offers to make it right is one you can trust when something goes sideways on your job. Sort by 'lowest first' and read 5 in a row. You'll learn more in 3 minutes than from any sales pitch.

5. 5. Ask about the apprentice situation

   This one almost no homeowner asks and it matters more than any other. Apprentice plumbers in Australia must be supervised by a licensed plumber — but in practice, sending an unsupervised apprentice to a residential callout is rampant. Ask straight up: 'Will a licensed plumber be on the job, or just an apprentice?' If the answer is fuzzy, push back.

6. 6. Check they know the standards

   Any plumber worth hiring will mention AS/NZS 3500 (the national plumbing and drainage standard) or WELS (Water Efficiency Labelling) without being prompted. If you're installing tapware or a toilet, ask whether the products carry a WELS rating. A plumber who looks blank when you mention these is either green or careless.

7. 7. Materials warranty vs workmanship warranty

   These are two different things and a good plumber knows the difference. The materials warranty comes from the manufacturer (e.g. Rinnai gives 12 years on the heat exchanger of a continuous-flow gas unit). The workmanship warranty comes from the plumber and covers their install — most reputable plumbers give 12 months minimum, many give 5 or 7 years on big-ticket installs. Get the answer in writing on the quote.

8. 8. See if they actually answer the phone

   Ring the plumber's number during business hours. If it rings out, goes to generic voicemail, or you get a 'we'll call you back' that never lands, that's a preview of how they'll handle your job. The best operators have a real receptionist, a 24/7 answering service, or an AI receptionist that books the job on the spot. A plumber who can't pick up the phone usually can't run a calendar — and that means missed appointments and jobs that drag on.

Red flags — walk away if you see these

• Door-knocking tradies. Real plumbers don't need to door-knock.
• Pressure to pay 100% upfront. A reasonable deposit (10–30%) is fair. Full payment before work starts is not.
• No written quote. "I'll sort it on the day, mate" is how a $300 job becomes a $1,800 invoice.
• No ABN. Check it on abr.business.gov.au.
• Cash-only discount. Sounds nice but means no invoice, no GST, no warranty, no record if things go wrong.

The phone test — why it matters

Ring the plumber's number during business hours. Then ring at 5pm. Then ring at 7pm. A plumber who picks up — or has a real receptionist or an AI receptionistthat books your job on the spot — has their business sorted. That's the same person who'll turn up when they say they will.

A plumber whose phone rings out, or who promises a callback that never comes, is showing you exactly how they run jobs. The phone behaviour is a near-perfect predictor of the job behaviour. We'd argue it's a stronger signal than online reviews.

Frequently asked questions