Supplying your own tapware and fixtures is common on Gold Coast new builds, especially custom builds where the owner wants a specific look or has found a better price than the builder's range. It is allowed, and we install plenty of owner-supplied fixtures. But there are real catches around certification, warranty and risk that you need to understand before you start buying, because getting it wrong can cost you more than the supply saving. Here is the honest breakdown.
The short answer, yes, with conditions
You can supply your own tapware, basins, toilets, showers, baths and most fixtures. The licensed plumber installs them and certifies the installation. What changes when you supply your own is who carries the warranty and the risk, and there is one hard rule around certification you cannot get around, anything connected to the drinking water supply has to be WaterMark certified. Get those two things right and owner-supply works well.
The WaterMark rule, the one you cannot skip
WaterMark is the certification scheme for plumbing products that connect to the drinking water supply in Australia. Tapware, mixers, valves, flexible hoses, toilet cisterns and inlet valves, and other products that contact drinking water have to carry WaterMark certification to be legally installed. This is not a preference, it is part of the compliance the licensed plumber certifies under AS/NZS 3500. A plumber cannot install and certify a fixture that is not WaterMark approved, because doing so would make the Form 4 compliance certificate invalid.
This matters most with imported and online-bought fixtures. A beautiful tap bought from an overseas site or a non-specialist retailer may not carry WaterMark, and if it does not, we cannot install it on the drinking water supply, no matter how much you paid for it. The safest path is to buy from Australian plumbing suppliers and reputable brands that carry WaterMark as standard. If you have found something online and you are not sure, send us the product details before you buy and we will check the certification. That five-minute check saves you from buying a fixture that cannot legally go in.
Warranty, who you chase when something fails
This is the biggest practical difference with owner-supplied fixtures. When the plumber supplies the fixture, the plumber stands behind it, if it is faulty, they sort out the warranty with the supplier and you deal with one party. When you supply the fixture, the product warranty is yours to chase with the supplier or manufacturer directly. If a mixer cartridge fails in year two, that is a claim you make with the brand, not with us.
The plumber still warrants the workmanship, the quality of the installation. So the split is clear, we are responsible for installing it correctly, you are responsible for the product itself. If an owner-supplied tap fails because the product is faulty, the workmanship guarantee does not cover the product, it covers our install. Worth understanding that split before you decide to supply, because chasing a product warranty yourself, especially on an imported item, can be slow and frustrating compared to the plumber handling it.
The risk you take on with owner-supply
- Wrong item. If you order the wrong size, the wrong connection type, or a fixture that does not suit the rough-in, that is on you, and it can mean a delay while the right item is sourced.
- Faulty on arrival. A fixture that arrives damaged or faulty is your claim to make, and the build may wait while a replacement comes.
- Missing parts. Some fixtures arrive without all the fittings needed to install them. We can only install what is supplied.
- Late delivery. This is the big one. Premium tapware can take weeks to arrive, and if it is not on site when fit-off is scheduled, the build waits for your taps. We will not start a partial fit-off because half-done fit-off creates re-mobilisation cost and stages out of sequence.
- Not WaterMark certified. If a drinking-water fixture turns up without WaterMark, we cannot install it, and you are back to sourcing a compliant alternative.
Lead times, plan for them
If you are supplying premium tapware, the single most important thing you can do is order early. Premium finishes can take weeks to arrive, and the build cannot wait indefinitely at fit-off. The lesson is to lock your fixture selections before pre-slab and order them at slab pour, not at lock-up. We provide a fixture list at quote stage so you know what is needed and when, and we will tell you honestly which selections have long lead times. If you want a premium finish, order it early and accept the timing. If you want the build to move fast, standard chrome ranges from the major Australian suppliers are stocked locally and arrive in days. We cover lead-time planning in our new build plumbing guide.
What we recommend buying yourself vs leaving to us
The fixtures that make sense to supply yourself are the visible, look-driven ones where you have a specific preference, tapware, basins, freestanding baths, shower sets, toilet pans. These are where owner-supply gives you control over the finish and sometimes a price saving. The items we generally recommend leaving to us are the back-of-house, compliance-critical components, the hot water unit, the pressure-limiting valve, isolation valves, backflow devices, and any fittings that have to meet specific standards. These are not look items, they are performance and compliance items, and having us supply them means the warranty and the compliance sit with us as a single package.
The hot water unit, supply this through us
We strongly recommend the hot water unit comes through us rather than owner-supplied. The reason is warranty registration and compliance. When we supply and install the HWU, we register the warranty in your name and the unit, the install and the compliance are a single package we stand behind. An owner-supplied HWU bought to save a few dollars can create warranty headaches, and getting the sizing and type wrong is an expensive mistake. We cover hot water sizing and selection across our hot water content, and on a new build it is one item where the supply saving rarely justifies the risk.
How owner-supply affects the quote
When you supply fixtures, our quote covers the installation labour and the back-of-house components, and your fixture cost sits separately with your suppliers. This can make the plumbing quote look lower, but remember the fixture cost has just moved to your column, it has not disappeared. The honest way to compare is total cost, our labour plus your fixtures, against a plumber-supplied quote that includes the fixtures. Sometimes owner-supply saves money, sometimes the builder or plumber discount on trade-supplied fixtures beats what you can buy retail. We are happy to line-item the quote both ways so you can see the real comparison. Pricing varies with the spec and the fixtures, so the right number always comes from a quote off your plans.
The practical process for owner-supplied fixtures
- Decide early which fixtures you are supplying and which you are leaving to us, ideally before pre-slab.
- Send us the product details before you buy so we can confirm WaterMark certification and that the fixture suits the rough-in.
- Order long-lead items at slab pour, not at lock-up, so they arrive in time for fit-off.
- Have everything on site before fit-off is booked. We need every tap, basin, toilet and shower fitting on hand, because partial fit-off costs you re-mobilisation.
- Keep all your supplier paperwork and warranties filed, because the product warranty is yours to chase.
- Inspect items on delivery for damage and missing parts, so a faulty item is found before fit-off day, not on it.
The bottom line on owner-supply
Owner-supplying tapware and fixtures works well when you buy WaterMark-certified products from reputable suppliers, order long-lead items early, and accept that the product warranty and the supply risk are yours. It gives you control over the finish and can save money. The pitfalls are non-compliant imported fixtures, late deliveries that hold up fit-off, and warranty chasing that you would otherwise have handed to the plumber. Leave the compliance-critical back-of-house items and the hot water unit to us, and we will install your owner-supplied fixtures to AS/NZS 3500 and certify the installation. For the full build picture, read our new build plumbing guide, see our new build plumbing service, or get in touch and we will check your fixture list before you buy.