Why Every Perth Homeowner Should Use a Licensed Plumber or Gas Installer
- Bonza Team
- May 14
- 6 min read
Using an unlicensed plumber or attempting DIY gas work in Perth is illegal, potentially dangerous, and likely to void your home insurance.
In Western Australia, all plumbing and gas work must be carried out by a licensed professional — and for good reason.
The consequences of cutting corners range from a $5,000 fine to a gas explosion.
This article explains exactly what's at stake and how to protect your home, your family, and your wallet.
What Are the Risks of Using an Unlicensed Plumber in Perth?
The risks aren't theoretical. Perth homeowners who've hired unlicensed operators — or attempted plumbing work themselves — have faced burst pipes, sewage backups, voided insurance claims, and gas leaks that required full evacuations. These aren't rare edge cases.
They're the predictable result of skipping licensed tradespeople to save a few hundred dollars upfront.
The actual cost of fixing unlicensed work is almost always higher than hiring a licensed plumber from the start.
Is Plumbing and Gas Work Regulated in Western Australia?
Yes — strictly. In Western Australia, plumbing and gas work is regulated under the Plumbers Licensing Act 1995 and the Gas Standards Act 1972.
Only licensed professionals can legally carry out:
Hot water system installation and replacement
Gas appliance connections and installations
Drainage and sewer work
Leak detection and pipe repairs
Bathroom, kitchen, and laundry renovations involving water or gas
Performing this work without a licence can result in fines of up to $5,000 for unlicensed plumbing — and significantly higher penalties for unlicensed gas work, given the immediate safety risks involved.
Why Does a Plumbing Licence Actually Matter?
A licence number isn't just a piece of paper. It's proof that the person working on your home has completed formal training, passed industry assessments, and is legally accountable for the work they carry out.
When you hire a licensed plumber, you get:
Verified competency — they've been assessed to a defined industry standard, not just watched a few YouTube tutorials
Legal accountability — they can be reported to the Building and Energy regulator if their work is substandard
Insurance validity — most home and contents policies require licensed tradespeople; unlicensed work can void a claim entirely
Manufacturer warranties protected — hot water systems, gas appliances, and similar equipment require licensed installation to maintain warranty coverage
When Bonza Complete Plumbing and Gas sends a plumber to your door, their licence numbers are PL10971 (plumbing) and GF19007 (gas fitting). You can verify both on the WA Building and Energy register before they touch a single fitting.
What Can Go Wrong With DIY Plumbing or Gas Work?
Water Damage and Flooding
Incorrectly connected pipes or loose fittings can leak slowly for months before anyone notices. By that point, you may be looking at damaged flooring, mould inside wall cavities, and — in older Perth homes with aging pipe systems — structural deterioration. A burst pipe from a faulty DIY repair can flood a home in minutes.
Blocked Drains That Get Worse
Clearing a blocked drain yourself might shift the immediate problem, but it rarely solves the cause.
Tree root intrusion, collapsed pipes, and pipe displacement (common in Perth's sandy and limestone soils) require camera inspection and professional equipment to diagnose properly.
Treating the symptom without finding the source usually means a sewage backup is coming.
Gas Leaks and Explosions
This is where DIY stops being a financial risk and becomes a safety emergency. A gas connection that isn't properly sealed — even slightly — can leak undetected.
Gas accumulates. All it takes is a spark. Licensed gas fitters carry pressure-testing equipment specifically to verify every connection is sealed before they leave the property. There is no DIY equivalent that offers the same assurance.
Voided Insurance and Warranty
If something goes wrong after unlicensed work, your insurer is within their rights to decline the claim.
The same applies to appliance manufacturers — most hot water system and gas appliance warranties explicitly require licensed installation.
Saving $200 on labour can cost you the entire replacement value of the system.
How Do You Verify a Plumber's Licence in Perth?
Don't rely on a van livery or a business card. The WA Department of Energy, Mines, Industry Regulation and Safety (DMIRS) maintains a public register of licensed plumbers and gas fitters at building.energy.wa.gov.au.
Before any plumber starts work at your property, ask for their licence number and check it. A legitimate, professional operator will have no hesitation giving it to you upfront.
At Bonza, we put our licence numbers on our website — PL10971 / GF19007 — because we have nothing to hide and everything to prove.
Book a licensed Bonza plumber today — get a free upfront quote with a confirmed appointment time:
What Should You Expect From a Licensed Plumber in Perth?
A licensed plumber should give you certainty — on price, on timing, and on outcome. Here's the minimum standard you should accept:
A free upfront quote before any work begins — not an estimate that shifts once the job starts
A confirmed appointment time — not a four-hour window that eats your whole morning
Licensed credentials available on request — no excuses, no vagueness
A one-visit resolution — a properly equipped plumber shouldn't need to come back because they forgot a part
If the person at your door can't confirm their licence number or won't give you a written quote before they start, that's your signal to ask them to leave.
Frequently Asked Questions
Can I do any plumbing work myself in Western Australia?
Minor maintenance tasks — like replacing a tap washer or a showerhead — are generally permissible for homeowners. However, any work involving drainage, gas, hot water systems, or connections to the water main must be carried out by a licensed plumber. When in doubt, call a licensed professional.
What is the fine for unlicensed plumbing work in Perth?
Under WA legislation, fines for unlicensed plumbing work can reach $5,000. Penalties for unlicensed gas work are higher, given the direct safety risks. Insurance and warranty implications typically cost far more than the fine itself.
How do I verify a plumber's licence in WA?
Visit the Building and Energy public register at building.energy.wa.gov.au. Enter the plumber's licence number or business name to confirm they are currently licensed and in good standing.
Does unlicensed plumbing void my home insurance?
Yes, in most cases. Standard home and contents policies in Australia require that plumbing and gas work is performed by a licensed contractor. If unlicensed work caused or contributed to the damage, insurers are entitled to deny the claim.
Why does gas work require a separate Gas Fitter licence?
Gas fitting carries a distinct set of risks compared to general plumbing. A separate Gas Fitter (GF) licence — like Bonza's GF19007 — confirms that the person has been specifically trained and assessed in gas system safety, pressure testing, and compliance with Australian gas standards. A plumbing licence alone does not authorise gas work.
What areas does Bonza Complete Plumbing and Gas service?
Bonza services the full southern Perth corridor — from Fremantle to Mandurah, including Cockburn, Rockingham, Baldivis, and surrounding suburbs south of the Swan River.
How quickly can Bonza respond to a plumbing issue?
Bonza operates with fully stocked vehicles and confirmed appointment times. For urgent issues, contact us directly and we'll give you a specific time — not a vague window.
The Bottom Line: Licensed Plumbing Isn't Optional in Perth
The licence requirement exists because plumbing and gas mistakes have consequences that go well beyond the inconvenience of a second visit.
Water damage destroys homes. Gas leaks kill people. The regulation is there to protect you — and the fine structure exists to make sure it's taken seriously.
When you hire a licensed plumber, you're not paying for paperwork. You're paying for verified competency, legal protection, insurance validity, and the right to hold someone accountable if the job isn't done properly.
For Perth homeowners south of the river, Bonza Complete Plumbing and Gas offers fully licensed plumbing (PL10971) and gas fitting (GF19007), free upfront quotes, confirmed appointment times, and fully stocked vehicles so the job gets done in one visit.
Ready to book a licensed plumber you can actually trust? Get Your Free Quote from Bonza →
Bonza Complete Plumbing and Gas — Licensed, Local, South of the River. PL10971 | GF19007 | Fremantle to Mandurah
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