How to Start a Plumbing Business in Australia
Plumbing is one of the most tightly licensed trades in the country, and the licence is only the first gate. Here's what setting up your own plumbing business actually involves.
Plumbing is a good trade to own a business in — the work doesn't dry up, the phone rings at the worst possible moment for the customer, and people pay to make that stop. It's also one of the most tightly regulated trades in Australia, and the licensing is where most first-timers underestimate the job. This guide covers what you're actually setting up: which licence and endorsements you need to contract in your own name, what the setup costs, how to price it, and how to keep the admin from swallowing your evenings.
Doing this job for a living? See ServiceYak for plumbers and quoting in ServiceYak.
Pick the plumbing business you're actually starting
Maintenance plumbing and construction plumbing are two different businesses wearing the same licence. They have different cash flow, different gear, different clients and very different lifestyles. Choose deliberately, because everything else follows from it.
- Maintenance and service — blockages, burst pipes, taps, hot water units. Cash turns over fast, jobs are small, and the phone rules your day. Highest admin load per dollar.
- New residential construction — rough-in and fit-off for builders. Predictable volume and bigger tickets, but you carry the builder's payment terms and their risk.
- Renovation and bathroom work — better margins than construction, more scope creep, more direct dealing with homeowners.
- Commercial and mechanical services — longer contracts, progress claims, more compliance paperwork, more people on site.
- Emergency and after-hours — a genuine premium channel, and a genuine cost to your weekends. Decide whether you want it before you advertise it.
Most new plumbing businesses run maintenance with a bit of reno work, because it pays quickly and doesn't need a crew. Just go in knowing that a business built on small jobs lives or dies on how fast you quote and how fast you invoice.
Licensing, endorsements and certificates
Plumbing licensing in Australia is state-based and it's layered. There's a difference between being licensed to do the work and being licensed to contract for it, and there's a further difference between classes of work — the licence isn't one thing you either have or don't.
- Contractor versus tradesperson. A tradesperson's licence lets you do the work under someone else. A contractor's licence is what lets you take the job in your own name and charge for it. That's the one you need to start a business.
- Classes and endorsements. Water supply, sanitary, drainage, roofing (stormwater), mechanical services, gasfitting, backflow prevention and thermostatic mixing valves are separate authorisations in most states. Your scope of work is whatever you actually hold.
- Gasfitting is its own gate. It's a separate authorisation everywhere, and one of the most common ways a new business ends up turning work away.
- Compliance certificates. Most plumbing work needs a certificate lodged with the regulator or the water authority, and some work needs to be notified before you start. Build the paperwork and the lead time into your quotes.
- Standards. Work has to comply with AS/NZS 3500 and the plumbing volume of the National Construction Code. Product approval matters too — installing something that isn't certified for the application is your problem, not the supplier's.
Licences don't automatically travel across state borders, and the classes don't map neatly between jurisdictions either. If you're near a border or planning to work interstate, check with the regulator in the other state before you quote there — not after you've won the job.
What you'll be spending money on
Plumbing is a gear-heavy trade to start, and the gap between the cheapest possible setup and a properly equipped one is enormous. Rather than a headline figure that won't match your situation, price these categories yourself — that's your real number.
| Category | What sits in it |
|---|---|
| Licensing and registration | Contractor licence, endorsements, ABN and business name |
| Vehicle | Ute or van, fit-out, shelving, pipe racks, ladder rack, signage |
| Core tools | Press tool and jaws, pipe cutters, threading gear, grinders, drills |
| Drain and diagnostic gear | Drain machine, jetter or jetter hire, inspection camera, locator |
| Van stock | Copper, PEX, PVC, fittings, tapware, valves, isolators, silicone |
| Insurance | Public liability, tools, contract works, income protection |
| Software and phone | Job management, accounting, mobile plan |
| Brand and marketing | Signage, uniforms, website, Google Business Profile |
| Working capital | Living costs and materials float until the first invoices are paid |
Two lines deserve extra thought. Drain gear is expensive and it's what lets you take the blockage calls that pay best — hiring it job by job works at first, but it caps how fast you can respond. Working capital is the one that ends businesses: you'll buy a hot water unit before anyone pays you for it, and that gap has to come from somewhere.
Price it properly from the first job
Plumbing has a bad habit that gets built in early: quoting a job by feel because you've done a hundred like it, and never checking whether those hundred actually made money. Set the number deliberately instead.
Start with what you want to earn, add every overhead you carry whether or not you're on a job, and divide by the hours you can genuinely bill. Travel, wholesaler runs, quoting and chasing money will take a bigger bite than you expect. Then add margin on top so the business banks something beyond your wage.
- Set a callout fee or minimum charge for service work. Without one, a fifteen-minute tap washer costs you the drive there and back.
- Work out your after-hours and emergency rate before the first Saturday-night call, and make sure the customer agrees to it on the phone.
- Decide whether you're quoting fixed price or time and materials for each type of job, and be consistent.
- Mark up materials on a stated basis — and know the difference between a 20% markup and a 20% margin, because they're different numbers.
Our guide to working out your charge-out rate runs the full calculation, and after-hours call-out rates covers how to price the work that ruins your weekend.
Insurance and the risks specific to plumbing
Plumbing's risk profile is unusual: the job that goes wrong doesn't usually hurt anyone, it floods a house. Water damage claims are large, they surface long after you've left, and they're the reason your cover matters more than your invoice book.
- Public liability — the baseline. Builders, agents and strata managers will want a certificate of currency before you're on site.
- Tools and equipment — a van full of gear, including drain machines and press tools, is a serious replacement bill.
- Contract works — cover for the job itself while it's under way, often required on larger contracts.
- Income protection — plumbing is hard on backs, knees and shoulders. This is what pays your bills if you're off the tools.
- Workers compensation — required as soon as you employ anyone. Requirements and premiums vary by state; check with your state authority.
Alongside cover, document the job. Photos before you start, photos of the pipework before it's covered, pressure test results, and a written note of anything you found and recommended but weren't engaged to fix. When a claim lands two years later, that record is the whole argument.
Winning the first work and getting paid for it
Plumbing leads come from three places in the first year: people who already know you, agents and builders who need someone who answers the phone, and Google. Work all three.
- Set up your Google Business Profile properly. Emergency plumbing is one of the most searched local trades there is. Fill the profile out, add real job photos, list your service area honestly, and ask every satisfied customer for a review.
- Introduce yourself to agents and strata managers. They need a plumber who turns up and sends a clear invoice. It's unglamorous, repeat, and it fills the quiet weeks — but it comes with their payment terms, so read them.
- Open a wholesaler account. Trade pricing plus 30-day terms is worth more to your cash flow in year one than almost anything else you can do.
- Answer the phone, or lose the job. For urgent plumbing the first plumber who picks up wins. If you can't answer on the tools, get a service that does, and return every call the same day.
- Invoice before you leave the driveway. Small maintenance jobs should be invoiced on site. Terms start when the invoice is sent, and the customer's memory of the job is never fresher than the moment you finish it.
ServiceYak keeps your labour rates, callout fees and common line items in a reusable kit, so a blocked drain or a hot water swap can be quoted and invoiced from the phone on site. The accepted quote becomes the job and the job becomes the invoice, with photos and notes attached to the same record.
Frequently asked questions
What licence do I need to start a plumbing business in Australia?
A contractor's licence in your state or territory — a tradesperson's licence only covers you working under someone else. You'll also need the specific classes and endorsements for the work you intend to do, such as water supply, drainage, sanitary, gasfitting or backflow. Check the current requirements with your state's plumbing regulator.
How much does it cost to start a plumbing business?
It depends almost entirely on what you already own. Price your own licence, vehicle and fit-out, core tools, drain gear, van stock, insurance and software, then add enough working capital to cover living costs and materials until invoices start being paid. That last part is usually larger than everything else combined.
Should I offer after-hours plumbing when I'm starting out?
It's the fastest way to build a customer base and the fastest way to burn out. If you do it, price it properly, get the rate agreed on the phone before you leave home, and set an end date or a rotation before you commit to it permanently.
Do I need a separate licence for gasfitting?
Yes. Gasfitting is a separate authorisation in every state and territory, held on top of your plumbing licence. If you don't hold it, you can't do gas work — and turning that work away is one of the most common frustrations for new plumbing businesses.