Repair Types Compared
Cement-based grouts such as Davco Sanitized Colorgrout (~$26 for 1.5kg) and Ardex FG8 (~$26 for 5kg) include anti-mould additives but remain porous and need periodic sealing. Epoxy grout costs more upfront but is non-porous, stain-resistant, and does not require sealing. For shower floors especially, epoxy is the better long-term choice.
What Affects the Cost
Surface problem vs membrane failure. Cracked grout or peeling silicone is a surface fix costing a few hundred dollars. A failed membrane underneath the tiles requires a full strip-out and replacement costing several thousand. Getting the diagnosis right before committing is critical.
Shower size and type. Larger showers with more tiles cost more to strip and retile. Hobless walk-in showers have more membrane area and more complex drainage falls than step-up (hob) designs. Under AS 3740:2021, the minimum fall to waste in shower areas is 1:80.
Grout type. Epoxy grout ($800–$1,500 for a full regrout) costs more than cement-based ($600–$1,200) but lasts roughly twice as long and resists mould without sealing.
Tile condition. If tiles can be saved during a partial repair, costs stay lower. If tiles are cracked, hollow-sounding, or discontinued and cannot be matched, full retiling is needed.
Subfloor damage. If the leak has persisted for months or years, timber framing underneath may be rotted. This must be repaired before new waterproofing goes on. Timber remediation can add $1,000–$3,000+ depending on the extent of damage.
Previous repair attempts. Showers that have been regrouted or injection-sealed before but still leak usually indicate membrane failure. The money spent on those repairs is gone.
Building type. Apartments add strata complications. If the leak is affecting the unit below, there may be insurance and body corporate considerations. Under most state strata legislation, waterproofing within your lot boundary is the lot owner's responsibility.
A silicone and grout reseal on a standard shower hob where the membrane is intact sits toward $250. A full strip-out of a hobless shower with confirmed membrane failure, rotted timber subfloor requiring framing replacement, and full retiling pushes toward $4,200.
How to Tell What Has Failed
Not every shower leak needs a full strip-out. The symptoms point to the source.
Silicone failure: Water seeps at the junction between the shower screen and tiles, or between the shower base and wall tiles. The silicone looks discoloured, has pulled away from the surface, or has black mould growing through it. Dries between showers. Fix: reseal.
Grout failure: Water tracks through cracked or missing grout joints. Grout appears chalky, powdery, or has gaps. Dampness shows on the other side of the shower wall. Fix: regrout.
Membrane failure: Persistent dampness that does not dry between showers. Water stains on the ceiling below. A musty smell that lingers. Soft or spongy floor near the shower base. Fix: full strip-out and re-waterproof.
A flood test confirms membrane condition. Block the drain, fill the shower base with 10–20mm of water, and leave it for 24 hours. If dampness appears outside the shower area, the membrane has failed. A good waterproofer will offer this test before recommending a full strip-out.
City and Regional Price Comparison
Shower leak repair pricing varies across Australia based on labour rates, construction methods, and local housing stock.
City-level differences: Sydney (NSW) is the baseline. Melbourne tracks close to Sydney. Brisbane often sits slightly below due to concrete slab construction being standard, which limits subfloor damage from leaks. In Perth and Adelaide, smaller trade pools and material logistics can affect shower repair quotes, while specialist waterproofer availability can extend booking lead times.
Property-level differences: Within any city, the main variable is the age and construction of the property. Older homes with timber-framed bathroom floors face higher repair costs because leaked water damages the subfloor structure over time. Concrete slab homes limit the damage scope because the slab itself does not deteriorate from water exposure, though the leak may travel sideways to adjacent rooms. Inner-city areas with older housing stock (Sydney's terraces, Melbourne's Victorians, Adelaide's character homes) consistently produce more complex repairs than newer outer suburbs. Properties built during construction booms (2003–2012 in Perth, 1990s–2000s apartment stock in Sydney and Melbourne) are now reaching the age where original waterproofing is approaching end of life.
How We Calculate
Estimates are based on surveyed rates from licensed waterproofers and plumbers across Australian capital cities, adjusted for regional labour markets and property age. All prices include GST. Figures cover standard residential shower leak repairs. Commercial properties are not included, and waterproofing the whole bathroom is a different scope: bathroom waterproofing costs $600–$3,600 per bathroom for preparation, membrane application and certification, excluding tiling.