Grout Repair near you

Cleaning brings back grout that is merely dirty. Repair is for joints that have physically failed or that are letting water through, and a few checks separate the two before anyone quotes.

The grout going back into the joints does not have to be the same kind that came out, but it does have to suit the joint width, the tile surface and how wet the room actually gets.

A proper regrout removes the old grout to a consistent depth with a grout saw, a carbide scraper or an oscillating tool, without chipping the glazed edges of the tiles. Scraping off only a surface skin is the classic shortcut and the classic failure: the new grout ends up too shallow to bond and cracks out again within months. The joints are then vacuumed clean, dampened if the product requires it, and packed full with grout worked diagonally across the joints, tooled to an even profile, and the haze wiped off the tile face before it sets hard.

Cement-based grout then has to cure before it is sealed or gets wet, and the label sets that time — which stretches out in a cool room through a southern winter, when June to August brings the slowest drying of the year. Plan on using another shower for a few days rather than testing it early.

Grinding out old cement grout raises respirable crystalline silica dust, and this is the part homeowners rarely anticipate. SafeWork NSW describes crystalline silica as a natural mineral found in products such as sand, concrete and granite and warns that microscopic silica dust particles can settle deep in the lungs, causing serious illness and death, and notes that crystalline silica laws changed in 2024. The controls it names include wet dust suppression, on-tool dust extraction and local exhaust ventilation, with water used to control dust when cutting materials such as brick or concrete and on-tool dust capture described as an effective way to reduce exposure. Where a respirator is used it must be fit tested at the start and every 12 months, against a workplace exposure standard of 0.05 milligrams per cubic metre averaged over eight hours.

Grout is rigid, so it cracks wherever two surfaces move independently of one another: the internal corners of a shower, the junction where wall tile meets the floor, the perimeter of a tiled floor, and anywhere tile meets a bath, a benchtop, a window frame or a different material altogether. Those junctions are meant to hold a flexible sealant suited to wet areas, often colour-matched to the grout. A crack running neatly up every internal corner of a shower is the signature of someone having grouted a joint that always needed sealant.

Sealant is a wearing part with a shorter life than grout, and it is replaced rather than patched. The old bead is cut and scraped out completely, the residue removed and the joint dried thoroughly before a new bead is laid and tooled, because fresh sealant over old sealant or over mould traps moisture and peels away. Larger tiled floors also need movement joints within the tiled field itself, placed as the installation instructions require; grouting over one brings the cracking straight back and takes the new grout with it.

Black spotting along grout lines and sealant beads is the most common complaint in an Australian bathroom, and it is reporting moisture at least as much as it is reporting dirty grout. NSW Health puts the mechanism simply: mould needs moisture and nutrients to grow, and it may grow indoors in wet or moist areas that lack adequate ventilation, including walls or wallpaper, ceilings and bathroom tiles. A bathroom that is humid for hours after every shower is a bathroom that will keep regrowing mould in its joints no matter how often the grout is replaced.

Humidity is the harder half of the problem along the subtropical coast and through a northern wet season, when the outside air brings little drying power with it and a closed-up house holds moisture for days. Running the exhaust fan during and well after a shower, opening the room up when the outside air is drier, squeegeeing the walls and screen down, and leaving the screen door ajar all do more for grout than any product does.

There is a health reason to deal with it rather than live with it. NSW Health lists the effects of mould exposure as a runny or blocked nose, irritation of the eyes and skin, and sometimes wheezing. For routine clean-up of mouldy surfaces the same factsheet suggests a mild detergent, or vinegar diluted in water at four parts vinegar to one part water. Mould that has grown into a silicone bead cannot be scrubbed back out, so that bead is cut away and replaced once the joint has dried properly.

Regrouting renews the surface of a shower. It cannot repair the waterproofing behind it, and when water has already reached the substrate, the evidence usually turns up outside the shower rather than in it. The housing provisions require the shower floor to be waterproof including any hob or step-down and the shower walls to be waterproof not less than 1800 millimetres above the floor substrate, with wet area building elements complying with AS 3740; when water is getting past all of that, the membrane or its detailing is what has failed.

A regrout on its own is minor work, but the moment a repair reaches the membrane it changes category, and the licensing makes the distinction clearly. Queensland treats waterproofing as a separate QBCC licence class from tiling: the waterproofing class covers applying, installing and repairing waterproofing including surface preparation, and applying or installing material or systems for preventing moisture penetration, while the wall and floor tiling class covers cutting and fixing tile to floors, walls, hearths, fireplaces, spas and swimming pools, constructing terrazzo, and applying waterproofing for wall and floor tiling.

New South Wales also licenses both. Waterproofing is defined there as any protective treatment of a home to prevent water or moisture getting into it, and the protective treatment of wet areas of a home such as a shower to stop the unwanted escape of water from those areas, with its own Certificate III qualification pathway. Wall and floor tiling work is a licensed trade in its own right and expressly includes waterproofing wet areas to get them ready for tiling. A contractor licence is required for residential building or trade work valued above a set figure in labour and materials including GST, which a regrout may fall below and a rebuilt shower will not.

So the question to ask is simple and specific: if this turns out to be a membrane failure rather than a grout failure, who does that part of the work and under which licence. Check the licence number on the regulator's public register before the job starts, not after the tiles are off the wall.

Australian Consumer Law gives you guarantees on this work that cannot be excluded by anything in a contract: an acceptable level of care and skill, fitness for any purpose you made known, and supply within a reasonable time where no time frame was agreed. The ACCC is clear that the basic rights covered by consumer guarantees cannot be taken away by anything a business says or does. Given how often a regrout is sold as a fix for a leak, the scope is where you protect yourself: whether the joints are being raked out to full depth or skimmed, which grout is going in, where flexible sealant is being used instead of grout, how the dust will be controlled, how long before the shower can be used again, and what the tradesperson will do if the substrate turns out to be wet.

LokalMatch is how you reach the people who do this. You describe the job once — the room, the extent of the grout, whether it is a shower or a splashback, whether anything is leaking, and your postcode — and tilers and waterproofers covering your area get in touch with you. They pay LokalMatch for the requests they take on, which is how the platform is funded, while describing a job costs a homeowner nothing. LokalMatch does not regrout or waterproof anything, does not quote or set prices, and does not vet, rank or recommend any business that contacts you, so the licence check and the reference check remain yours to make.