Photo from: Sun Built Constructions

Cost of bathroom waterproofing

Last updated: 3rd Oct 2018

When you’re renovating your bathroom, the first elements that come to mind often include tiling, fittings and fixtures. One of the most important foundations of the bathroom, however, is the waterproofing that lies beneath. In such a moist environment, waterproofing is absolutely essential in the bathroom to prevent leak-associated issues, including rising damp, peeling paint and plasterboard decay. Bathroom waterproofing services cost around $34.50/m2. If you only want a specific area waterproofed, you can expect rates to be as low as $33/m2. However, if your entire bathroom needs waterproofing, you could end up paying about $42.50/m2.

Where do these prices come from?

All prices stated in this article are based on FY 2016 pricing data compiled by The figures resulted from a comprehensive analysis of quotes submitted by Waterproofing Specialists on the site from July 2015 to July 2016.

The basics: Why waterproof?

By law, waterproofing is an essential and basic requirement of every bathroom. As set out by the Building Code Australia (BCA), the following areas need waterproofing:

  • Shower enclosure floors & walls
  • Shower enclosure step and down to the floor
  • Bathroom walls, to a height of 1.5m
  • Bathroom floor, if on the second floor or higher, or made of timber

The basics: What is waterproofing?

Waterproofing is a membrane-like layer that lies beneath the tiles, and is often included in the tiling quote (although this is worth checking). Applied to the surface like paint, waterproofing is a highly flexible, water based, polyurethane substance that creates a protective film when dry. The process usually takes 2-3 days and involves 2 coats. The area being waterproofed must be completely cleaning and sealed before waterproofing application.

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How much does it cost?

For an average sized bathroom, you can expect to pay around $600-$800 for a complete waterproofing job. For second storey bathrooms, which require floor waterproofing, you can expect this cost to rise. On the other hand, you can expect the cost to lower if packaged with your tiling job or part of a larger renovation involving multiple rooms eg. Ensuite, Main Bathroom & Kitchen.

We cannot stress enough the importance of hiring a professional to do your bathroom waterproofing. Unlike other jobs which could potentially be DIY’d, an amateur waterproofing job could cost you thousands of dollars down the track when a leak comes through. Serious structural damage can be caused by poor waterproofing, so hiring a reliable, well-reviewed professional is also a must. let’s you check reviews of local professionals and compare quotes to find the business that’s right for you. Post your waterproofing job now to start receiving free quotes.

Bathroom waterproofing prices from real customers

Richie from NSW
He needed waterproofing and tiling done for a bathroom renovation at his Paddington residence. The job was already started, and he just needed someone to finish it.
TOTAL COST: $3,500
Abraham from NSW
He hired a professional to waterproof the bathroom and the kitchen at his home in Tuggerawong.
TOTAL COST: $3,000
Viliam from QLD
He paid for waterproofing and screeding to be done on the shower area of his home in Toowong. The job included tiling the shower floors, bathroom walls, and an extra wall in the hallway.
TOTAL COST: $1,750

Factors that affect the cost of waterproofing services

There are jobs that you can do by yourself, but bathroom waterproofing is definitely not one of them. Bathroom waterproofing is best left to qualified experts, and in order to prepare for the cost of hiring professionals, you need to understand the factors that can affect the final price of the job.


Since plenty of waterproofing businesses quote on a per-square metre basis, the size of your bathroom will naturally affect the actual cost of the project. The price also depends on whether you want the entire bathroom waterproofed or just a particular area like the shower floor.


Liquid-applied membranes are the most widely used material for wet areas like bathrooms. Different types of membrane include acrylic, chlorinated rubber or latex, epoxy, polyurethane, polyester resin, and tar epoxy. When it comes to bathroom waterproofing, there is no clear best option, as it will all depend on the application and other job-specific requirements. Additionally, membranes vary in elasticity, and those with higher elasticity typically offer more protection.

Labour costs

Hiring a licensed waterproofing business may seem costly at first, but it’s definitely a worthy investment. Also, remember that the cheapest quote does not necessarily mean it’s the best one for your budget. By hiring unlicensed or shady tradesmen, your bathroom becomes at risk of being damaged. This is will definitely cost you more in the long run.



Pricing information correct as at August 2016.

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There are a lot of qualified bathroom waterproofing experts in your area who can help you. Take a look at’s highest-rated bathroom waterproofing specialists in these major cities: