- Why the smallest room produces the most expensive mistakes
- Treating the laundry as a dry room and skipping waterproofing
- Moving the plumbing to chase a better layout
- Renovating a pre-1990 laundry without an asbestos check
- Designing the cabinetry before measuring the appliances
- Wiring the room for one appliance when it runs three
- Sealing the room without mechanical ventilation
- Getting the drainage and tempered water wrong
- Frequently asked questions
The laundry is the room homeowners spend the least time planning and the most money fixing. It is small, it is functional, and it sits at the bottom of the renovation priority list — so it gets the leftover budget, the leftover attention, and a layout sketched on the back of the kitchen plan. Then it produces a repair bill that has nothing to do with how it looks.
That is the part the renovation industry is not commercially incentivised to tell you: the laundry is a wet area, governed by the same standards as a bathroom, sitting on top of plumbing, electrical, and often a sheet of material that was legal in 1985 and hazardous now. The mistakes that cost real money in a laundry renovation are not aesthetic. They are structural, and they are made before a single tile is chosen.
What follows are the seven laundry renovation mistakes that actually cost money in Australia — what each one costs, why it costs it, and the planning decision that prevents it. None of them are about taste. All of them are about sequence and specification, which is where the prepared homeowner wins the project before it starts.
Nobody loses $10,000 on a laundry because the tiles were wrong.
They lose it because the room was treated as dry when the standards treat it as wet.
The figures below are drawn from current Australian renovation cost reporting, the National Construction Code's wet-area provisions, and the state consumer-protection regulators who publish the defect data. Use them as a frame against your own room.
Why the smallest room produces the most expensive mistakes
A laundry renovation in Australia runs from roughly $2,000 for a cosmetic refresh to $25,000 or more for a full custom fit-out, with most homeowners landing somewhere between $6,000 and $15,000 for a mid-range strip-out and rebuild. The room is small, so the visible budget is small — and that is exactly what sets the trap. A homeowner who would never skip a step in a $40,000 kitchen will happily skip three in an $8,000 laundry, because the number feels too low to need a system.
The number is low. The downside is not. A waterproofing failure costs the same to remediate in a laundry as in a bathroom, because the water does not know which room it is in — and the laundry concentrates every expensive risk of a wet-area renovation into the room with the smallest budget and the least planning. That is the worst ratio of cost-to-fix against money-spent of any room in the house.
Treating the laundry as a dry room and skipping waterproofing
This is the mistake that turns a $9,000 renovation into a $20,000 one. A laundry is a wet area. Under the National Construction Code and AS 3740 — Waterproofing of domestic wet areas, the floor requires waterproofing and the room requires a floor waste, because a laundry holds a washing machine, a trough, and a hot-water connection, any one of which can fail and release water onto the floor.
Homeowners who treat the room as dry — tile straight onto the substrate, skip the membrane, leave out the floor waste — discover the consequence the first time a hose perishes or a connection weeps. Water tracks under the cabinetry, into the wall framing, and through to the room next door or the level below. By the time it shows as a stain on a ceiling, the framing is wet, the flooring is lifting, and the remediation involves tearing out work that was finished six months ago. The waterproofing that would have cost $1,000 to $2,500 to do correctly becomes a five-figure rebuild.
The discipline is the same one that governs bathroom waterproofing in Australia: the membrane is a hold point you verify before tiling begins, because once the tiles are down the membrane cannot be inspected. The laundry gets the same treatment or it gets the same failure.
Moving the plumbing to chase a better layout
The single biggest cost lever in a laundry renovation is whether the plumbing stays where it is. Keeping the trough, the washing-machine taps, and the floor waste in their existing positions keeps the plumbing line small. The moment any of them moves — particularly on a concrete slab — the cost escalates, because relocating waste and water means cutting the slab, re-laying drainage to the correct fall, and re-rough-in work that a like-for-like layout never triggers.
Relocating laundry plumbing typically adds $2,000 to $5,000 to the project, and the figure climbs on a slab. That is not a reason never to move it — sometimes a better layout is worth the spend — but it is a decision to make deliberately, with the cost in front of you, not a line a designer slips into a plan because the trough looks better on the other wall. A homeowner who understands that they are buying a slab cut, not a longer pipe, prices the decision correctly. A homeowner who does not finds it as a variation.
Get your laundry cost baseline first
The free Renovation Cost Calculator gives you a trade-by-trade estimate in under 5 minutes — before your first trade conversation. It separates the cost of the room you want from the cost of the decisions that quietly inflate it.
Renovating a pre-1990 laundry without an asbestos check
The laundry is the room most likely to contain asbestos, and the room homeowners are least likely to check before demolition. In Australian homes built or renovated before 1990, asbestos cement sheeting was a standard wall and ceiling lining in wet areas, and the laundry — fibro walls, a fibro splashback behind the trough, vinyl flooring with a backing board — was a common place to find it.
Demolishing that material without testing it releases fibres into the home and turns a renovation into a contamination event. The Asbestos and Silica Safety and Eradication Agency sets out the rules: in most states a licensed removalist is required for more than ten square metres of bonded asbestos, and doing it yourself can be both illegal and uninsurable. Professional assessment is cheap — a few hundred dollars. Removal is not, typically running $2,000 and up. But the unbudgeted version of that cost, discovered mid-demolition with the room already open and a contamination clean-up underway, is far worse than the planned one. In any pre-1990 home, the asbestos check is a line item, not a surprise.
Designing the cabinetry before measuring the appliances
A laundry is built around two appliances that have non-negotiable dimensions, and homeowners routinely design the joinery before confirming them. A front-loading washing machine is roughly 600mm deep before you add the door, and the door swings out 550mm or more — so a cabinet run that looks generous on a plan becomes a room where the washing-machine door hits the opposite cabinetry. A top-loader needs vertical clearance for the lid. A stacked washer-dryer needs height and a bracket rated for it. A heat-pump dryer needs airflow clearance the brochure specifies and the plan ignores.
The fix costs nothing if it happens in the right order and thousands if it does not. Confirm the exact make, model, and door-swing of every appliance before the joinery is drawn, not after — because cabinetry built to the wrong clearances is cabinetry rebuilt at full price. This is the laundry version of the rule that governs every room: the specification is locked before the trade quotes, never discovered after the trade installs.
Wiring the room for one appliance when it runs three
The old laundry had one power point for one washing machine. The modern laundry runs a washing machine, a dryer that increasingly draws its own dedicated circuit, and bench appliances — and homeowners keep specifying it for the load it carried in 1995. A single double power point behind the machines, with no allowance for the dryer's circuit or the bench, produces a finished room that trips its own breaker or runs an extension lead across a wet floor.
Electrical work in a wet area is governed by AS/NZS 3000 — the Wiring Rules, which set the clearances between power points and water sources and require residual current device (RCD) protection on the circuits. Getting the electrical plan right means deciding, before the walls close, how many circuits the room needs and where every outlet sits relative to every water source. Adding a circuit after the plaster is on is a chase-and-patch job at several times the cost of running it during rough-in — and rough-in is a phase that happens once.
Five of the seven mistakes on this page are sequence failures, not taste failures — they happen because a decision was made after the phase that should have contained it.
Waterproofing, plumbing position, appliance clearances, and electrical layout are all locked before the walls close. A laundry planned to that sequence costs what it should. A laundry planned room-by-room as the trades arrive pays the variation premium on every one of them.
Sealing the room without mechanical ventilation
A laundry generates more moisture than almost any room in the house — a washing machine, a hot trough, and frequently a dryer venting warm, wet air into a small, often windowless space. Seal that room with new cabinetry and fresh paint and no mechanical ventilation, and the moisture has nowhere to go but into the surfaces. The result is mould on the new joinery, peeling paint, and a smell that no amount of cleaning fixes because the cause is structural.
The National Construction Code requires wet areas to be ventilated, by an openable window or by mechanical exhaust. In a windowless laundry, or one with a condensing or vented dryer, that means an exhaust fan ducted to the outside — not into the roof cavity, where it simply moves the moisture problem into the ceiling. Ventilation is one of the cheapest line items in the room and one of the most expensive to retrofit once everything is finished, because retrofitting it means opening surfaces that were just closed.
Getting the drainage and tempered water wrong
Two plumbing details decide whether a finished laundry actually works, and both are easy to get wrong on a plan that was never reviewed against the standards. The first is drainage: the floor has to fall to the floor waste, and the washing machine needs a standpipe and trap sized for the discharge rate, or it floods the floor on every spin cycle. The second is hot water: a laundry trough is a fixture that delivers hot water, and under the plumbing code, hot water delivered to a fixture used for personal washing is tempered to a maximum of 50°C to prevent scalding.
These are not decisions a homeowner makes by taste — they are compliance items a licensed plumber executes, which is precisely why they get skipped when the work is done cheaply or informally. A laundry plumbed without the correct falls, standpipe, and tempered supply is a laundry that either does not drain or does not comply, and both are problems that surface after final payment, when the leverage to compel the fix is gone. The state consumer-protection regulators — NSW Fair Trading and its equivalents — exist for exactly this gap, but the cheaper route is to specify it correctly the first time.
The pattern under all seven
Every mistake on this page shares a structure: a decision that belonged in the planning phase was deferred until the room was already being built, and the cost of correcting it after the fact was a multiple of the cost of making it on time. The laundry punishes this harder than any other room because its small budget tempts homeowners to skip the planning the room's wet-area status actually requires.
That is the whole game. A laundry renovation that is sequenced — waterproofing verified, plumbing position decided on cost, asbestos checked, appliances confirmed, electrical and ventilation planned before the walls close — costs what the quote says. A laundry renovation improvised room-by-room as the trades turn up costs the quote plus every variation the improvisation triggers. The difference is not money. It is order.
The complete laundry renovation checklist sets out every one of those decisions in the order it has to be made, and the laundry renovation cost guide shows where each dollar goes — so the room is planned as the wet area it is, not the afterthought it looks like.
Run the laundry like a wet-area renovation, because it is one
The Laundry Renovation Blueprint carries the full sequence — the waterproofing hold point, the appliance clearances, the electrical and plumbing specification, and the decisions locked before the walls close — so the smallest room in the house is planned with the same discipline as the most expensive.
If the cost baseline is the right first step, use the free Renovation Cost Calculator — a trade-by-trade estimate for your specific laundry, in under 5 minutes, before any trade has quoted.
Frequently asked questions
Does a laundry renovation need waterproofing in Australia?
Yes. A laundry is classified as a wet area under the National Construction Code, which means the floor must be waterproofed and the room must have a floor waste. AS 3740 governs the waterproofing of domestic wet areas, and it applies to the laundry the same way it applies to the bathroom. Skipping the membrane to save $1,000 to $2,500 is the most expensive saving in the room, because a failure tracks water into the framing and the adjoining space and turns into a five-figure remediation.
How much does a laundry renovation cost in Australia in 2026?
A cosmetic refresh — paint, tapware, a new benchtop, keeping the existing layout — runs roughly $2,000 to $6,000. A mid-range strip-out and rebuild with new cabinetry, tiling, and fixtures typically lands between $6,000 and $15,000, where most homeowners sit. A high-end laundry with custom joinery, stone, full-height tiling, and relocated plumbing runs $18,000 to $25,000 or more. The largest single cost lever is whether the plumbing moves.
Why is moving laundry plumbing so expensive?
Relocating the trough, washing-machine taps, or floor waste means re-running water and waste lines to the correct drainage fall, and on a concrete slab it means cutting and re-laying the slab. That work typically adds $2,000 to $5,000 to a laundry renovation, where a like-for-like layout that keeps every fixture in its existing position adds nothing. The cost is in the slab and the drainage, not the length of pipe — which is why it should be a deliberate, priced decision rather than a layout preference.
Could there be asbestos in my laundry?
If the home was built or renovated before 1990, it is possible. Asbestos cement sheeting was a standard wall, ceiling, and splashback lining in wet areas, and the laundry was a common location. Demolishing it without testing releases fibres into the home. A professional assessment costs a few hundred dollars; in most states a licensed removalist is required for more than ten square metres of bonded asbestos. Test before demolition in any pre-1990 home — the planned cost is always lower than the contamination clean-up.
What is the most common laundry renovation mistake?
Designing the cabinetry before confirming the appliances. A front-loading washing machine is around 600mm deep with a door that swings 550mm or more, and joinery drawn without those exact dimensions produces a room where the door hits the opposite cabinet or the machine does not fit its cavity. The fix costs nothing if the appliances are confirmed before the joinery is drawn, and the price of new cabinetry if they are not.
Does a laundry need its own exhaust fan?
If the room has no openable window, yes — the National Construction Code requires wet areas to be ventilated, and a windowless laundry needs mechanical exhaust ducted to the outside. Even a laundry with a window benefits from exhaust if it houses a dryer, because a dryer releases warm, moist air that condenses on cool surfaces and grows mould on new joinery and paint. The fan must vent outside, not into the roof cavity, which only relocates the moisture problem.