New Build Plumbing on the Gold Coast: The Complete 2026 Guide

This is the hub for everything to do with plumbing a new home on the Gold Coast. We'll walk through why new build plumbing is its own specialty, the stages of plumbing work through a build, what the plumber actually installs, how coordination works between you, the builder and the trades, what compliance and certification you should end up holding, what drives the cost, and the mistakes that catch people out. Wherever a topic deserves a deeper dive, we've linked you straight to it.

If you want the practical pre-start list rather than the full process, our new build plumbing checklist is the 12-point run-through we walk every client through before we start. If you're owner-building, the licensing and DIY rules are covered in full on our owner-builder plumbing requirements for QLD guide. This page is the broader, process-focused overview that ties it all together.

Why new build plumbing is its own specialty

Plenty of plumbers are excellent at maintenance and repair but rarely touch a new build, and the two jobs ask for different things. New build plumbing is as much about sequencing and coordination as it is about the plumbing itself.

Here's what makes it different:

• It's done in stages, in a fixed order. The drainage goes in before the slab. The water and gas rough-in goes in after the frame but before the walls. The fixtures go on after the tiling. Get out of sequence and you're tearing out finished work.
• Most of it gets buried. Under-slab drainage is set in concrete. Rough-in pipework disappears behind plasterboard. A mistake you'd fix in an hour on an exposed pipe becomes a major job once it's covered.
• It has to line up with everyone else. The plumber works to the builder's program, around the framer, the electrician, the waterproofer and the tiler. Timing matters as much as workmanship.
• It carries the whole certification load. The plumber has to sign off the work for QBCC and your certifier at the end, and without that paperwork the build doesn't get its certificate of classification.
• Decisions are locked in early. Where the toilet sits, which hot water system you run, whether you're on gas, these get committed before the slab is poured. Changing your mind later costs real money.

None of this is hard if it's planned. It only becomes a problem when the plumbing is treated as something to sort out later. On a build, later is usually too late.

The plumbing stages of a new build

Every new home runs through the same four broad plumbing stages, in the same order, regardless of whether it's a small townhouse or a big custom job. The detail within each stage is where the real work sits, and we cover that properly in our new build plumbing stages on the Gold Coast guide. Here's the high-level map so you can see how the whole job fits together.

That's the whole job at a glance. The order is not flexible, and each stage has its own inspection or hold point. If you want the blow-by-blow on what happens within each one, including the set-out detail and the inspection sequencing, that all lives in the stages guide.

What the plumber actually installs

People often picture a new build plumber as the person who hangs the taps at the end. The taps are the last 5% of it. Here's everything that actually goes in.

Sewer and stormwater drainage

The sanitary drainage carries waste from every fixture out to the council sewer connection at the right fall, so it flows by gravity. The stormwater system carries roof and surface water away to your legal point of discharge. Both go in at the pre-slab stage and both are set in or under the slab, which is exactly why they have to be right the first time. On the Gold Coast, where most suburban homes are slab-on-ground, the relationship between your sewer connection depth and your floor level is the first thing we check, because the drain can't run uphill.

Water supply and pressure limiting

The water service brings mains water from the meter into the house and distributes hot and cold to every fixture. A pressure-limiting valve goes on at the meter. Mains pressure on the Coast can run high, above what household pipework and fittings are comfortably rated for, and a pressure-limiting valve protects the whole house from premature failures. It's required by AS/NZS 3500 on a new install and it's not something to skip.

Gas rough-in and appliance points

If the home has gas, whether natural gas off the street or LPG off bottles, the gas pipework is roughed in to each appliance point: cooktop, hot water, any heating or a BBQ point. Even if you're not going gas now, running a sleeve to the kitchen during the build is cheap insurance against a wall-out later. Gas work in Queensland is licence-only and needs its own compliance certificate, which is why we treat gas fitting as its own scope within the build.

Hot water system

The hot water system is one of the bigger decisions in the build, and it's best locked in early because the system you choose changes what gets roughed in. A heat pump needs a pad and electrical supply. Gas continuous flow needs gas, exhaust clearance and the right connections. Solar needs the roof designed for it. Deciding at fit-off instead of at design stage is how people end up paying for a retrofit.

Fixtures and tapware

The fixtures are the visible end of the job, the toilets, basins, baths, showers, sinks, tapware, the dishwasher and laundry connections. They go on at fit-off after the tiling, and this is where careful work shows. A mixer a couple of degrees off level, a spout that doesn't sit over the basin, a scratched finish, these are the details that separate a careful install from a rushed one.

Coordination: builder, plumber and owner-builder

Who runs the show depends on how the build is set up, and it's worth being clear on this before you start, because coordination is where new builds either flow or fall over.

On a builder-managed build, the builder holds the program and the plumber works to it. The builder books the plumber in for each stage, coordinates with the other trades, and the plumbing is one line item in a much bigger schedule. Your job as the owner is mostly to make your fixture and system selections in time, because late decisions stall the plumber.

On an owner-builder build, you're the coordinator. You're booking the plumber for each stage, lining them up with the framer, the waterproofer and the tiler, and making sure inspections are scheduled. It's more control and a genuine saving, but the coordination work is real and the consequences of getting the order wrong land on you. We cover the licensing, what you can and can't legally do yourself, and how to engage a plumber stage by stage in the owner-builder requirements guide.

Either way, the single best move is bringing the plumber in early. A good plumber will flag where a drain is going to fight the slab grade, where a wet area is too far from services, and what you need to decide before the slab is poured, while it's all still cheap to change. We've put the detail on those pre-slab calls in what plumbing you decide before the slab is poured, because that one conversation saves more money than almost anything else on a build.

Compliance and certification: what you get and why it matters

In Queensland, plumbing, drainage and gas work are regulated and licence-only. On a new build that means the work has to be done by a QBCC-licensed plumber, inspected at the right stages, and certified at the end. The paperwork isn't bureaucracy for its own sake, it's what lets your certifier issue the certificate of classification, the document that legally lets you move in.

Here's what should land in your hands at the end of the build:

• QBCC Form 4 (plumbing compliance). The plumber's certification that the plumbing and drainage work complies. This is the big one. If you're not sure what it is or whether you need it, we explain it in full in what a QBCC Form 4 is and whether you need it.
• Gas compliance certificate for any gas work, issued by the licensed gas fitter.
• Hydrostatic pressure test certificate confirming the water service was tested and holds.
• Backflow prevention test certificate if a backflow device was installed.
• Hot water system warranty registered in your name.
• As-built drainage plan showing where everything actually went, which you'll be glad of years later when you need to dig.

Inspections happen at hold points through the build, typically before the slab pour and after rough-in, plus the final. These get booked ahead because inspectors and certifiers fill up, so a plumber who books them early keeps your build moving. File the whole paperwork pack somewhere safe. You'll need it for the certificate of classification, for any future insurance claim, and when you eventually sell.

What drives the cost, and a rough range

Whole-house new build plumbing on the Gold Coast commonly runs somewhere in the region of $15,000 to $30,000 or more, but that's a wide band for a reason, and every build is genuinely different. Treat any number you read online, including ours, as a starting point only. Get a fixed-price quote against your actual plans before you budget on it.

The things that move the number:

• Size and number of wet areas. More bathrooms, an ensuite, a butler's pantry, a separate laundry, each adds fixtures, pipework and labour.
• Single or double storey. A second storey means more pipework, more rough-in, and stack and vent work that a single level doesn't need.
• Fixture quality. Builder-grade tapware and a budget toilet sit at one end. Premium brassware, a freestanding bath and feature showers sit at the other, and the gap is large.
• Gas. Adding gas means a gas rough-in, appliance connections and a separate compliance certificate. Natural gas versus LPG changes the setup too.
• Hot water choice. A basic electric unit and a high-end heat pump or solar system are different jobs and different money.
• Site and connection. An easy connection at the boundary is cheap. A long run, a deep connection, or a tricky grade adds cost before a single fixture goes in.
• Acreage services. Tanks, pumps, on-site wastewater and LPG all add to the scope, which we cover below.

Because of all that, the honest answer to "what will my plumbing cost" is always the same: it depends on your plans, and the only number worth budgeting on is a written quote against them.

Choosing fixtures and supplying your own

Your fixture selections drive a chunk of both the cost and the rough-in, so they're worth getting sorted early. The big trap is finalising fixtures after the rough-in is done. The rough-in sets the centres, heights and outlet positions for your specific tapware, and a wall mixer set for one spout won't sit right for another. Lock your selections before rough-in, not after.

A lot of owners ask about supplying their own taps and fixtures to save money, and sometimes it works out. Before you do, check three things: the warranty terms, because some brands only honour the warranty when installed through authorised channels; the stock and lead time, because a back-ordered fixture can stall your fit-off; and that the spec actually matches the rough-in. Plenty of owners find the saving wasn't worth the hassle once a delayed or mismatched fixture holds the job up. If you do supply your own, get the full spec to your plumber before rough-in so the set-out is right.

On finishes, coastal air matters here. Close to the beach, salt is hard on cheap coatings, and quality finishes hold up where budget ones go dull and pitted within a couple of years. It's worth spending where it counts on anything exposed.

Common new build plumbing mistakes

Most of the trouble we get called to on new builds traces back to a short list of avoidable mistakes. None of these are exotic. They're the ones that keep happening.

• Missing a slab penetration. Every wet fixture needs a through-slab sleeve set before the pour. Miss one and you're coring through finished concrete later. Have the plumber present at pre-pour and check every penetration.
• Locking in the layout, then changing it. Moving a wet area after the drainage is set, or after rough-in, means reworking buried pipework. It's one of the most expensive changes you can make on a build.
• Finalising fixtures too late. Wrong centres set at rough-in, discovered at fit-off after the tiling, which is exactly when it's most expensive to fix.
• Skipping the pressure-limiting valve. Leave it off and you get premature fitting failures across the whole house, plus a non-compliant install.
• Missing an inspection slot. Inspectors book out. Miss the pre-slab inspection and the pour gets delayed, which delays the framer, which pushes the whole build.
• Not collecting the compliance paperwork. No Form 4, no certificate of classification, no moving in. Make sure the full pack is handed over at completion.

Almost every one of these is prevented by the same thing: a plumber who's involved early, communicates before doing variations, and books inspections without being chased.

Timeline: how long the plumbing takes

The plumber isn't on site continuously through a build. They come in for each stage and leave between them while other trades work. Spread across a typical suburban new build, the plumbing involves a handful of distinct visits over four to six months of elapsed build time, even though the plumber's actual days on site are far fewer than that.

Roughly, it runs like this: pre-slab drainage and set-out early in the build, rough-in after the frame is up, the pressure test before sheeting, fit-off after waterproofing and tiling, and final commissioning and certification near handover. An acreage build with a tank, on-site wastewater and LPG runs longer because there's simply more to install and more to commission. The exact spacing depends on your builder's program, but the order never changes.

Acreage differences: tank, septic and LPG

A lot of the Gold Coast hinterland and acreage, around Mudgeeraba, Tallai, Bonogin and out west, sits beyond mains sewer, mains gas and sometimes town water. That changes the plumbing scope meaningfully.

• Rainwater tank and pump. Without town water, or to supplement it, you're on tank water, which means a tank, a pump and the pipework to feed the house at usable pressure. That's licensed plumbing work from the tank into the home.
• On-site wastewater. No council sewer means a septic system or an aerated wastewater treatment system. Which one suits depends on a council soil test and the site, and the council has to approve it before installation. An aerated system also comes with an ongoing servicing requirement.
• LPG instead of natural gas. No gas main means LPG: a bottle hardstand outside, a regulator and changeover, and internal pipework to the appliances, all licensed gas work with its own compliance certificate.

None of this is a problem, it's just more scope, and it adds to both the cost and the timeline. The key on an acreage build is getting the soil test and system approvals moving early, because they sit on the critical path.

Why you should use a licensed plumber early

The thread running through all of this is the same: the plumbing decisions that matter most get made before any pipe goes in the ground. Slab grade versus connection depth, where the wet areas sit, which hot water system, gas or no gas, what gets sleeved for the future. A licensed plumber brought in at design stage flags all of it while it's still cheap to change. Brought in once the slab's drawn and the trusses are ordered, they're working around problems instead of preventing them.

Licensing isn't optional here either. In Queensland, plumbing, drainage and gas work is licence-only, the work has to be certified, and that certification is what gets you legally into the house. Using a licensed plumber isn't just the safe choice, it's the legal one, and it's the difference between a clean certificate of classification and a build that stalls at the finish line.

If you're planning a new home on the Gold Coast, the best time to talk to a plumber is before the design is locked. We handle new build plumbing across the Coast, from production homes to custom and acreage builds, and we're happy to look over your plans early. Send them through the contact page or ring us on 0472 657 042.