Laundry Waterproofing Cost Sydney 2026: Requirements, Membrane & Repair Costs
Last Updated: October 2026
Renovating a laundry in Sydney—or noticing water, dampness or damaged flooring around your existing laundry?
Waterproofing is one part of the project you don’t want to overlook.
Homeowners often focus heavily on bathroom waterproofing while assuming the laundry is a much simpler area. But laundries contain washing machines, water connections, sinks or tubs, floor penetrations and other potential sources of water.
So, how much does laundry waterproofing cost in Sydney in 2026?
There isn’t one price that applies to every laundry.
The cost depends on the size and layout of the room, substrate condition, preparation, membrane system, penetrations, drainage, whether existing finishes need removal and whether the project involves new waterproofing or repair of an existing water problem.
This guide explains what affects laundry waterproofing prices, what homeowners should know before renovating and why a cheap surface fix may not solve an existing leak.
Quick Answer: How Much Does Laundry Waterproofing Cost in Sydney?
Laundry waterproofing costs in Sydney vary according to the size and configuration of the laundry, substrate condition, preparation, membrane system, floor and wall detailing, penetrations and whether the work is part of a new renovation or rectification. Existing leaking laundries can cost more to repair because flooring, tiles or damaged materials may need to be removed before the waterproofing system can be accessed and repaired.
Rather than comparing quotes only by a price per square metre, homeowners should compare the complete scope of work.
That includes preparation, detailing, membrane application and any repair work required before waterproofing can begin.
Does a Laundry Need Waterproofing in NSW?
This is one of the most important questions homeowners ask when renovating a laundry.
Laundry waterproofing requirements depend on the construction and configuration of the wet area and the building requirements applicable to the project.
A laundry shouldn’t simply be treated as an ordinary dry room because it can contain:
- washing-machine water connections
- laundry tubs
- sinks
- water supply pipes
- floor wastes
- tiled floors
- plumbing penetrations
- areas exposed to spills or leaks
Australian wet-area construction requirements should therefore be considered when planning the renovation.
For Hills Waterproofing, this is also why the waterproofing scope should be established before new cabinetry, flooring and finishes make the area difficult to access.
What Determines Laundry Waterproofing Cost?
The final cost isn’t based on room size alone.
Here are some of the major factors.
1. Size of the Laundry
Larger laundries generally require more waterproofing material and labour.
But a small laundry isn’t automatically a very cheap waterproofing job.
A compact laundry can still contain:
- several plumbing penetrations
- corners and junctions
- a floor waste
- a laundry tub
- washing-machine connections
These details require attention regardless of the overall floor area.
2. New Laundry vs Existing Laundry
This can make a major difference to cost.
New Laundry or Renovation
When the existing finishes have already been removed and the substrate is ready for preparation, waterproofing can form part of the planned renovation sequence.
A typical process may involve:
substrate preparation → detailing → membrane application → curing → following finishes.
Existing Leaking Laundry
If the room is already finished and water is appearing outside the laundry, the situation can be more complicated.
The project may involve:
investigation → removal of finishes → assessment → substrate repairs → waterproofing → reinstatement.
This is why the cost of installing new waterproofing should not be directly compared with the cost of repairing an existing waterproofing problem.
3. Substrate Condition
Waterproofing relies on the surface underneath it.
If the substrate is damaged, cracked, contaminated or otherwise unsuitable, preparation may be required before the membrane can be installed.
The scope can potentially include:
- cleaning
- crack treatment
- surface repairs
- preparation
- priming
- correction of unsuitable areas
Preparation is not the visually exciting part of a laundry renovation, but it is an important part of the waterproofing system.
4. Waterproofing Membrane
Different projects may require different waterproofing products and systems.
The membrane itself is only one component of the overall cost.
A complete waterproofing scope can involve:
preparation + primer + detailing + membrane + curing + protection.
This is why buying a container of waterproofing membrane and multiplying its cost by the floor area doesn’t provide an accurate estimate of professional waterproofing.
For more information, read our Waterproofing Membrane Cost Sydney 2026 guide.
5. Floor Wastes and Drainage
Where drainage forms part of the laundry design, the relationship between the floor, waste and waterproofing needs appropriate consideration.
Problems around these areas can become particularly frustrating because the visible water may appear some distance from the actual defect.
The waterproofing system and drainage arrangement should therefore be considered together rather than as completely separate parts of the renovation.
6. Plumbing Penetrations
Laundry walls and floors can contain numerous penetrations for:
- washing-machine connections
- taps
- sinks
- tubs
- drainage pipes
- water supply pipes
These areas can require additional detailing.
A room with more complex plumbing can therefore require more waterproofing work than another laundry of exactly the same floor area.
Laundry Waterproofing Cost Per m²
A common Google search is:
“How much does laundry waterproofing cost per square metre?”
Per-m² pricing can help with early budgeting, but it shouldn’t be treated as the final project cost.
Imagine two laundries with the same floor area.
Laundry A
A stripped renovation with a straightforward layout and prepared substrate.
Laundry B
An existing finished laundry with damaged flooring, several penetrations and an unresolved water leak.
The square metres may be identical.
The required work isn’t.
That’s why Hills recommends obtaining a quote based on the actual condition and scope of the laundry.
For broader waterproofing pricing information, see our Waterproofing Cost Sydney – Price Per m² Guide.
How Much Does a Laundry Waterproofing Membrane Cost?
The membrane material is not the whole job.
Professional installation can involve:
- checking the substrate
- preparing the area
- treating critical junctions
- detailing penetrations
- priming where required
- installing the waterproofing system
- allowing required curing
- preparing the area for following trades
The complexity of those stages influences the final quote.
When comparing contractors, ask what is included rather than comparing only the cost of membrane material.
Laundry Waterproofing vs Bathroom Waterproofing
A laundry and bathroom are both wet areas, but their layouts and water exposure are not identical.
A bathroom may contain:
- shower
- bath
- floor waste
- vanity
- multiple high-water-exposure areas
A laundry may contain:
- washing machine
- laundry tub
- sink
- water connections
- floor waste
- cabinetry
That means the waterproofing scope shouldn’t automatically be copied from one room to another.
Each area should be assessed according to its design and applicable requirements.
If you’re also renovating a bathroom, read our Bathroom Waterproofing Cost Sydney 2026 guide.
Laundry Waterproofing During a Renovation
The best time to think about waterproofing isn’t after your new laundry has been installed.
It is during the planning and preparation stages.
Why?
Because after installation, the waterproofing may be concealed beneath:
- floor tiles
- flooring
- cabinetry
- appliances
- finishes
If a waterproofing defect is discovered later, accessing it may mean disturbing work you’ve already paid to complete.
A properly planned renovation allows waterproofing to be integrated into the construction sequence rather than treated as an afterthought.
Water Leaking From Your Laundry Floor?
This is where the article moves from renovation advice into high-intent repair searches.
If water is appearing outside your laundry, don’t immediately assume the waterproofing membrane has failed.
Possible sources can include:
- washing-machine hoses
- plumbing connections
- laundry tub
- waste pipes
- floor waste
- seals
- waterproofing defects
- another concealed water source
The first step should be determining where the water is actually coming from.
Signs Your Laundry May Have a Waterproofing Problem
Watch for:
- bubbling paint
- swollen skirting boards
- damp flooring
- mould around the laundry
- musty smells
- loose tiles
- damaged grout
- water stains on adjoining walls
- moisture in the room beside the laundry
- ceiling stains beneath an upstairs laundry
- recurring water damage
These signs don’t automatically confirm membrane failure.
However, repeated moisture should be investigated rather than repeatedly painted over or sealed.
Laundry Leaking Into the Room Next Door
Water doesn’t always become visible directly where it entered.
You may first notice:
Laundry → wall → adjoining hallway or room
Signs can include:
- peeling paint
- swollen timber
- damaged flooring
- damp plasterboard
- mould
- staining
If these symptoms appear after the washing machine is used or following water exposure in the laundry, identifying the source becomes important before repairs begin.
Replacing the damaged paint or flooring without addressing the water source can allow the problem to return.
Laundry Leaking Through the Ceiling Below
An upstairs laundry leak can become particularly serious because the first visible symptom may be downstairs.
You might notice:
- brown ceiling stains
- bubbling paint
- damp plasterboard
- dripping
- mould
The visible ceiling damage doesn’t necessarily identify the exact location where the water entered above.
Investigation may need to consider both plumbing and waterproofing before deciding on the repair.
Is It Waterproofing or Plumbing?
This distinction can save homeowners from paying for the wrong repair.
Possible Plumbing Problem
The leak may be associated with:
- washing-machine hose
- tap connection
- water supply
- waste pipe
- sink or tub plumbing
Possible Waterproofing Problem
Water may be escaping through areas that should be protected by the wet-area waterproofing system.
Sometimes Both Need Investigation
A plumbing leak can also expose weaknesses or cause damage around the surrounding building materials.
Instead of guessing, identify the source first.
Can You Repair Laundry Waterproofing Without Removing Tiles?
It depends on what has failed.
If the source is an accessible plumbing or local maintenance issue, removing the tiled floor may not be necessary.
However, if the concealed waterproofing membrane underneath the finished surface requires replacement, access to that layer may be required.
This is the same principle we discuss in our guide:
Do I Need to Remove Tiles to Fix a Waterproofing Leak?
Don’t demolish the laundry without investigation—but don’t assume a surface seal will repair every concealed waterproofing problem either.
Can Regrouting Fix a Leaking Laundry?
Regrouting can be appropriate where the grout itself requires maintenance.
But grout shouldn’t be confused with the waterproofing membrane.
If moisture is moving through the building assembly because the waterproofing system has failed, simply replacing grout may not address the underlying problem.
This is especially important when a laundry has already been:
- regrouted
- resealed
- repainted
but the moisture keeps returning.
Laundry Waterproofing Repair Cost
Repair costs depend on what needs to be accessed and rectified.
There can be a substantial difference between:
Accessible Local Repair
A confirmed, limited issue that can be reached without extensive demolition.
Waterproofing Membrane Repair
A defect involving the waterproofing system.
Membrane Replacement
A broader failure requiring access to and replacement of existing waterproofing.
Complete Laundry Rectification
A larger project involving demolition, damaged substrates, waterproofing and reinstatement.
This is why an accurate quote should follow an understanding of the problem.
Why Delaying a Laundry Leak Can Cost More
A small amount of visible moisture may not look urgent.
But if water continues reaching surrounding materials, the eventual scope can expand.
Potentially affected areas can include:
- skirting boards
- plasterboard
- cabinetry
- timber
- flooring
- paint
- adjoining rooms
- ceilings below
At that stage, you’re no longer paying only for waterproofing.
You’re paying for waterproofing plus resulting building repairs.
Laundry Waterproofing in Apartments
A leaking laundry inside an apartment can become more complicated if moisture affects:
- another apartment
- common property
- shared building elements
- the ceiling below
Responsibility depends on the circumstances, source of the problem and relevant strata arrangements.
For more information, read our guide:
Who Is Responsible for Waterproofing in Apartments NSW?
If the problem affects a neighbouring lot, investigating the source early can also help clarify what type of repair is actually required.
Laundry Waterproofing as Part of a Whole-Home Renovation
If you’re renovating several rooms, waterproofing shouldn’t be planned one room at a time without considering the overall project.
Your property may require waterproofing across:
- main bathroom
- ensuite
- laundry
- balcony
- terrace
- other wet areas
Planning these areas together can make it easier to coordinate waterproofing before expensive finishes are installed.
This will become particularly relevant to our upcoming Whole Home Waterproofing Sydney guide.
What Should a Laundry Waterproofing Quote Include?
When comparing quotes, ask what you’re actually getting.
Depending on the project, the scope may identify:
- waterproofing area
- substrate preparation
- membrane system
- junction treatment
- penetration detailing
- floor waste detailing
- repairs
- exclusions
- demolition if applicable
- reinstatement if applicable
- relevant documentation
Two quotes with different scopes shouldn’t be compared only by their final dollar amount.
Cheap Laundry Waterproofing Can Become Expensive
Waterproofing is usually hidden once the renovation is complete.
That makes shortcuts particularly risky.
Once your:
tiles + cabinetry + appliances + finishes
are installed, accessing the membrane can become far more disruptive.
A low waterproofing quote can therefore become an expensive decision if the finished laundry later needs to be dismantled for rectification.
Focus on the quality and completeness of the proposed work, not only the initial number.
Real Hills Project: Laundry Waterproofing in Annangrove, NSW
A recent Hills Waterproofing project in Annangrove, NSW demonstrates why preparation and membrane installation are so important when renovating a laundry.
The residential project involved waterproofing both the laundry and bathroom as part of a property renovation. During the initial inspection, signs of minor water damage were identified in the laundry walls, with the existing waterproofing requiring rectification before the renovation could progress.
Project Snapshot
Location: Annangrove, NSW
Property: Residential home
Service: Laundry and bathroom waterproofing
Project type: Renovation and waterproofing rectification
Existing issue: Inadequate previous waterproofing with minor moisture damage identified in the laundry walls
Waterproofing system: Sika® and Enviro Systems waterproofing products
Turnaround: Both wet areas were waterproofed and ready for tiling within three days.
What Hills Waterproofing Completed
The existing waterproofing layers were removed before the surfaces were repaired, dried and prepared for the new waterproofing system.
The project included:
Removal of the existing waterproofing layers
Surface repairs and drying
Primer application
Waterproofing membrane application across the required floors, walls and junctions
Detailing around floor drains and waste outlets
Sealing of wall-to-floor junctions
Post-application checks and water testing
The work covered both the laundry and bathroom, allowing the wet areas to proceed to the tiling stage once the waterproofing process was completed.
Why This Annangrove Project Matters
This project demonstrates why laundry waterproofing cost should not be calculated from floor area alone.
The condition of the existing waterproofing, moisture damage, substrate preparation, removal of old materials, detailing around wastes and installation of the new membrane system can all affect the final scope and price.
For homeowners renovating an older laundry, identifying these issues before new tiles, cabinetry and appliances are installed can also reduce the risk of having to remove expensive finishes later to access a concealed waterproofing problem.
See the Full Annangrove Project
View Hills Waterproofing’s Laundry & Bathroom Waterproofing Project in Annangrove NSW to see more details from the completed project.
Why Choose Hills Waterproofing for Laundry Waterproofing in Sydney?
Hills Waterproofing provides waterproofing services for wet areas throughout Sydney, including:
- laundries
- bathrooms
- showers
- balconies
- waterproofing membranes
- waterproofing repairs
- water-ingress problems
Whether you’re preparing a laundry renovation or trying to determine why an existing laundry is causing water damage, the priority is understanding the area and the required waterproofing scope before proceeding.
Laundry Waterproofing Across Sydney
Hills Waterproofing services the Hills District and wider Sydney, including:
If you’re renovating a laundry or dealing with an existing water problem, contact Hills Waterproofing to discuss the project.
Need a Laundry Waterproofing Quote in Sydney?
If you’re renovating, arrange the waterproofing before the new flooring, cabinetry and appliances make the area difficult to access.
If your existing laundry is leaking, don’t keep repairing the visible damage without finding where the moisture is coming from.
Get a Free Waterproofing Quote
Call Hills Waterproofing on 0410 570 721 or request a quote online for laundry waterproofing and waterproofing repairs across Sydney.
Frequently Asked Questions
Does a laundry need waterproofing in NSW?
Laundry waterproofing depends on the construction, layout and requirements applicable to the wet area. A laundry can contain water connections, sinks, wastes and other areas requiring appropriate wet-area detailing.
How much does laundry waterproofing cost in Sydney?
Costs vary according to room size, substrate, preparation, membrane system, penetrations and whether the work involves new waterproofing or rectification.
How much does laundry waterproofing cost per m²?
Per-m² pricing can provide a preliminary estimate, but it doesn’t fully account for preparation, junctions, penetrations, wastes and repairs. A project-specific quote is more useful.
Do you need to waterproof the whole laundry floor?
The waterproofing extent should be determined according to the laundry design, construction and applicable requirements rather than applying one universal answer to every property.
Why is water coming through my laundry floor?
Possible causes include plumbing leaks, washing-machine connections, drainage problems, floor-waste issues or waterproofing defects. The source should be identified before choosing the repair.
Can laundry waterproofing be repaired without removing tiles?
Potentially, depending on the defect. If the concealed membrane itself needs replacement, access beneath the finished floor may be necessary.
Is grout waterproofing?
Grout is part of the tiled finish but should not be treated as a substitute for an appropriate waterproofing membrane system.
Should waterproofing be completed before laundry cabinetry?
Waterproofing should be coordinated with the overall construction sequence so the required areas can be properly prepared and treated before later finishes obstruct access.
Can a leaking laundry damage adjoining rooms?
Yes. Water escaping from a laundry can potentially affect walls, flooring, cabinetry or ceilings in surrounding areas depending on the source and construction.
Who should I call if my laundry is leaking?
If the source isn’t known, it is important to establish whether the issue relates to plumbing, waterproofing or another building defect before proceeding with rectification.
📞 Call us at 0410 570 721
📧 Email: [email protected]
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