Laundry Renovation Order of Trades in New Zealand: The Right Sequence

Last updated: 7 July 2026 · By Mossy Tariq, Founder — Property Blueprint Co.

A laundry looks like the smallest, simplest room to renovate — a tub, some cabinetry, a washer and dryer. But behind that cabinetry sits a wet-area floor waste, a water supply and waste line, a dedicated power circuit, and often a dryer vent that has to exit the building somewhere. The order those trades work in is fixed by what depends on what, and a laundry gives less room than almost any other space in the house to correct a decision made out of turn.

That is the trap. Homeowners plan a laundry renovation the way they would plan a wardrobe fit-out, and the room punishes that assumption harder than a kitchen or a bathroom does, because there is no spare floor area to work around a mistake. A trade working out of sequence in a laundry does not just cost time — it usually means removing cabinetry or fit-out that was only just installed to reach a service that should have gone in first.

A laundry hides its drainage and its dryer venting inside the walls — sequence the trades wrong and the fit-out has to come back off.

What follows is the correct order of trades for a laundry renovation in New Zealand — the sequence, the rough-in and waterproofing that controls it, and the points where it most often goes wrong.

Why the order of trades decides a laundry renovation

Every trade in a laundry depends on the one before it, and several of them are buried or invisible once the room is finished. The plumber's supply and waste lines and the floor waste run under the floor; the electrician's circuits run inside the wall; the waterproofing membrane sits under the tile; the cabinetry sits on top of the finished floor; the appliances connect last, to services that already have to exist and already have to be in the right place.

This is why a laundry renovated out of sequence costs disproportionately more than its size suggests. Discovering after the cabinetry is installed that the washing machine's water inlet is a few centimetres out of position, or that the dryer has nowhere to vent to, is not a quick fix — it means pulling cabinetry that was only just fitted to reach a service that was never planned for. The same dependency logic that governs every wet area in the 12 phases of a renovation applies here, compressed into a room with almost no spare space to absorb an error.

The correct order of trades for a laundry

A laundry renovation in New Zealand moves through these stages in this order. Each stage needs the one before it finished, because the room is too small to work any other way.

1. Choose the appliances and finalise the layout. The washer, dryer, and whether they sit side by side or stack, along with the dryer type, are decided before any trade is booked. Every service position downstream is set from this decision, not the other way around.
2. Strip-out and demolition. The old tub, cabinetry, and floor coverings come out, and the existing plumbing, wiring, and floor waste are exposed so their real condition and position are visible before anything new is planned around them.
3. Rough-in: plumbing, drainage, and electrical. A registered plumber sets the water supply, waste, and floor waste to the confirmed appliance positions, and a registered electrician runs the circuits, including a dedicated circuit for the dryer if it needs one. Both trades work while the floor and walls are still open, because this is the last point either can be repositioned without undoing finished work.
4. Ventilation and dryer duct. Where the dryer is vented rather than a condenser or heat-pump type, the exterior duct run is installed now, while the wall is still open — a step that has to be planned into the rough-in, not added once the cabinetry is in.
5. Waterproofing the wet area. A laundry is a wet area under Building Code clause E3, and the floor waste zone is waterproofed to AS/NZS 4858 and laid to a fall before any tiling begins, exactly as a bathroom floor would be.
6. Inspection, where the work is consented. If the renovation is under building consent — most commonly because drainage or water supply has been relocated — the rough-in and waterproofing are inspected before the floor is tiled and the walls are lined, because neither can be verified once covered.
7. Tiling, linings, and paint. The waterproofed floor is tiled, the walls are lined and painted, and the room is brought to a finished state before any cabinetry goes in.
8. Cabinetry and benchtop install. The cabinetry and benchtop are installed against finished, waterproofed, and painted surfaces, built around the appliance positions locked at the start.
9. Connect and test the appliances. The plumber and electrician return to connect the tub, tapware, and washing machine, and the dryer is connected to its vent or condensate line, with a full cycle run to confirm supply, drainage, and power before anything is called finished.
10. Final inspection and defects. The floor waste and falls, the wet-area finishes, the documentation, and a defects list are checked before final payment, and any consented work has its final council sign-off before the project closes.

The rough-in and waterproofing that has to happen before fit-out

The two stages that decide whether a laundry goes together cleanly are the rough-in and the waterproofing, and both have to be complete before a single piece of cabinetry arrives. The plumber sets the supply, waste, and floor waste to the confirmed appliance positions; the electrician runs the circuits, including any dedicated dryer circuit; and where a vented dryer is specified, the exterior duct is planned into that same rough-in stage, because retrofitting a duct through a finished wall is a different job entirely from running it while the wall is open.

Sanitary plumbing and drainlaying must be carried out or supervised by a person registered with the Plumbers, Gasfitters and Drainlayers Board, and electrical work by a registered electrician — both restricted for the same reason they are hardest to correct once buried. The waterproofing that follows is not optional: a laundry is treated as a wet area under Building Code clause E3 because the washing machine discharges water under pump pressure, hoses can fail, and the tub can overflow, so the floor waste zone is membraned to AS/NZS 4858 and laid to a fall exactly as a bathroom floor is. Skipping or rushing this step is invisible on the day and expensive the first time a hose fails.

Where homeowners get the laundry sequence wrong

The laundry invites two specific sequencing mistakes, both common, both expensive to reverse.

Choosing the cabinetry before the appliances. Selecting a beautiful run of joinery and only then shopping for a washer and dryer to fit it is the most common laundry mistake there is. Appliance dimensions vary meaningfully between brands and models, and a stacked configuration needs different clearances than a side-by-side one. Cabinetry designed before the appliances are chosen is cabinetry designed around a guess, and the guess is usually wrong by the few centimetres that matter.

Fitting cabinetry before the waterproofing is confirmed complete. The temptation to see visible progress — cabinets in, room looking finished — is strong, but installing joinery over a floor waste zone that has not been waterproofed and inspected means that if the membrane fails or was never properly done, the cabinetry comes out to fix it. The check costs fifteen minutes; skipping it costs the room. The full list of ways a laundry renovation goes wrong, including this one, is set out in the laundry renovation mistakes guide.

Both mistakes share the same root cause — treating the laundry as a cabinetry job rather than a services job. The joinery is the visible layer; the drainage, the dryer venting, and the waterproofing underneath it are what has to be right before anything covers them.

How the order protects the budget and the schedule

Running the trades in order is what keeps a laundry on its quoted price and its quoted timeline. When the appliances are chosen before the layout is drawn, when the rough-in and waterproofing are complete and checked before tiling, and when the cabinetry goes in against finished, waterproofed surfaces, each trade walks into a room ready for it and walks out without rework. Nothing gets opened twice, and nothing waits on a decision that should have been made earlier. The full planning sequence, stage by stage, is set out in the laundry renovation checklist, and the budget side of the same room is in the laundry renovation cost guide. How long each stage takes on the calendar — including the lead times that run before any trade arrives — is set out in the laundry renovation timeline.

The prepared homeowner makes this happen by locking the appliance choice before strip-out, confirming the waterproofing record exists before a single tile is bonded, and booking each trade to follow the one before it rather than calling them in whenever the room looks ready. The 12-Phase System, Property Blueprint Co.'s named framework for running a renovation from the first quote conversation to final sign-off, treats this sequence discipline as the difference between a laundry built once and a laundry built twice.

If the cost baseline is the right first step, use the free Renovation Cost Calculator — a trade-by-trade estimate for the specific laundry, in under 5 minutes, before any trade has quoted.

Frequently asked questions

What is the correct order of trades for a laundry renovation?

Choose the appliances and finalise the layout first, then strip out the old room, then the rough-in of plumbing, drainage, and electrical together, including the dryer duct if one is needed, while the floor and walls are open. The wet area is then waterproofed to AS/NZS 4858 and laid to a fall, inspected where the work is consented, then tiled, lined, and painted. Cabinetry and the benchtop go in against those finished surfaces, and the appliances are connected and tested last, followed by a final inspection and defects check.

What has to be roughed in before a laundry is tiled?

The water supply, waste, and floor waste positioned to the confirmed appliances, the electrical circuits including any dedicated dryer circuit, and the exterior duct run for a vented dryer all have to be installed before the waterproofing membrane goes down and the floor is tiled. Sanitary plumbing and drainlaying must be carried out or supervised by a person registered with the Plumbers, Gasfitters and Drainlayers Board, and electrical work by a registered electrician.

Do I choose the appliances before or after designing a laundry?

Before. The washer and dryer, and whether they sit side by side or stack, set the plumbing positions, the power points, and the cabinetry dimensions. Designing the joinery first and buying the appliances afterwards is the most common laundry mistake, because the appliances then may not fit the space or the configuration the cabinetry was built for.

Does a laundry need to be waterproofed like a bathroom?

Yes. A laundry is treated as a wet area under Building Code clause E3, because the washing machine discharges water under pump pressure, hoses can fail, and the tub can overflow. The floor waste zone is waterproofed to AS/NZS 4858 and laid to a fall, the same protection a bathroom receives and for the same reason, and it has to be complete before tiling and before any cabinetry is installed over it.

Why does the order of trades matter so much in a laundry?

Because a laundry has almost no spare floor area to absorb a mistake, and much of what matters is hidden — the drainage under the floor, the wiring inside the wall, the dryer duct, and the waterproofing membrane under the tile. Fitting cabinetry before those are confirmed complete means pulling recently installed joinery to reach a service that was never planned for. The order builds the laundry once instead of twice.

Can plumbing and electrical work happen at the same time in a laundry?

Yes, and they usually should. The plumber and electrician typically work in the same rough-in window while the floor and walls are open, because both are setting positions against the same confirmed appliance layout and neither can start until that layout is locked. Running them separately, days apart, only adds time without adding any sequencing benefit, provided the appliance positions and any dryer duct route were settled first.