You stand in the bathroom doorway and your mind runs the numbers. A full bathroom renovation. Tiles ripped out. Waterproofing redone. A new shower screen. Trades on site for a week. Maybe two. The bill? Somewhere between eight and fifteen thousand dollars, and that is if the substrate is not already rotted through.
That is what every homeowner fears when they first notice the shower is leaking. The good news, and it surprises most people, is that a leaking shower can be fixed without removing a single tile. The industry calls it a shower repair or a regrout, and at Mr Grout we have been doing it for over 27 years across Brisbane and the Gold Coast.
Here is exactly how it works, when it applies, and why the method we use is often a better long-term solution than demolition and retiling.
First, Understand Where the Water Is Actually Going
When a shower leaks, the water is almost never coming from your pipes. The plumbing is usually fine. The problem is that water from the shower floor is finding its way through the grout and into the space beneath and behind the tiles. The grout, which is supposed to be a watertight barrier, has deteriorated. Once water gets through, it has nowhere to drain. It sits there, soaking into the adhesive, the substrate, and eventually the timber framework and the ceiling below.
If your tiles are still solid and the shower base is intact, the solution is not to tear everything out. The solution is to remove the failed grout, replace it with a properly applied material that will not let water through, and restore the waterproof seal. That is a regrout, and it is done without lifting a tile.
The Mr Grout Method: Epoxy Grout, Not Standard Grout
This is the most important part, so read it carefully. Standard cement-based grout, the stuff your shower was likely built with, is porous. Even when it looks intact, it absorbs a small amount of moisture with every use. Over five, ten, or fifteen years, that moisture adds up. The grout weakens. The adhesive underneath softens. The water path opens.
We use Mapei epoxy grout, which is a fundamentally different product. Epoxy grout is not cement-based. It is a two-part resin system that cures to a hard, non-porous finish. Water does not soak into it. Mould cannot feed on it. It does not shrink, crack, or discolour the way standard grout does. Once it is in, it stays watertight.
Epoxy grout is more difficult to work with than standard grout. It requires precise mixing ratios, a fast application window, and experienced hands to get a clean finish before it sets. That is why most general tilers do not use it. We do, because it is the only grout that genuinely solves the problem for the long term. That is also why our work carries an up to 5-year warranty.
What the Process Actually Looks Like
If you are imagining a week of jackhammers and dust, you are picturing the wrong job. A professional regrout is clean, controlled, and fast. Here is what happens on the day:
- Inspection. The technician checks every tile, every grout line, and the perimeter joints. They confirm the tiles are still bonded and the substrate is sound. If there is hidden damage, we find it now, before any work starts.
- Grout removal. Every millimetre of old, deteriorated grout is cut out using carbide-tipped tools. The tiles are untouched. The work is precise and methodical. No shortcuts. If the old grout stays, the new grout cannot bond.
- Deep clean and dry. The empty grout joints are vacuumed, cleaned, and fully dried. Any residual moisture or dust at this stage will compromise the new grout. This step is boring but it is what separates a five-year fix from a five-month fix.
- Epoxy grout application. The Mapei epoxy grout is mixed and applied into every joint. Because epoxy sets fast, the technician works in controlled sections, ensuring every line is fully packed and finished cleanly before moving on.
- Perimeter sealing. The joints where the walls meet the floor and where the shower screen meets the tiles are re-silicone with a high-quality mould-resistant sealant. These movement joints are critical. If they fail, water gets behind the tiles regardless of how good the grout is.
- Final inspection and clean-up. The technician walks you through the finished shower, explains the curing window, and hands over the warranty details. The area is left clean and ready for use once the curing period has passed.
Most showers are done in a single visit, within a half day. Curing takes 24 to 48 hours after that, depending on conditions. For more detail on timing, see our guide on how long shower regrouting takes.
When This Works (and When It Does Not)
A regrout solves the problem when the leak is coming through the grout. In our experience, that covers roughly 80% of leaking showers. But there are two scenarios where it is not the right call:
1. The waterproofing membrane has failed. If the waterproofing layer beneath the tiles has broken down or was never properly installed, replacing the grout alone will not stop the leak. The membrane itself needs to be redone, and that does require removing tiles. The good news is that a failed membrane usually shows clear signs: water appearing on walls well away from the shower, or leaks that persist even when the shower has not been used for days.
2. The tiles themselves are damaged or loose. If the tiles have de-bonded from the substrate, water is getting through whether the grout is good or not. Cracked tiles also create direct water pathways. In these cases, the affected tiles need to be replaced alongside the regrout. This is still far less invasive than a full bathroom rip-out, but it is more than a regrout alone.
The inspection step catches both of these. If your shower needs more than a regrout, you will know before any work begins, with a written quote that spells out exactly what is involved. No surprises.
Regrouting vs Retiling: The Cost Reality
A professional shower regrout typically costs between $800 and $2,500 depending on the size of the shower and the amount of grout being replaced. A full retile of the same shower runs from $8,000 to $15,000 and involves weeks of disruption.
The regrout preserves your existing tiles, which is important because modern large-format tiles are often of higher quality than what you would replace them with on a budget renovation. You keep the look you chose. You keep the layout you are used to. You just get a shower that is watertight again. We cover this in more detail in our comparison of regrouting versus retiling.
Can You DIY This? Honestly, No
Bunnings sells grout. That does not mean you should be the one applying it to your shower floor. Here is why:
- DIY grout removal tools do not cut deep enough. Leaving old grout in the joint guarantees the new grout will not bond.
- Epoxy grout is not a beginner-friendly product. It sets fast, requires precise mixing, and is unforgiving of mistakes. Get it wrong and you have a harder problem than you started with.
- If the leak is not actually just grout, you will not know. A DIY regrout over a failed membrane or a rotten substrate is money and effort spent making the problem invisible while it gets worse underneath.
The cost of a professional regrout is less than the cost of fixing a DIY regrout gone wrong.
The Bottom Line
Yes, a leaking shower can be fixed without removing tiles. That is not a sales pitch. It is what we do every day. If your tiles are sound and your waterproofing is intact, a professional regrout using Mapei epoxy grout restores the shower to a watertight condition in a single visit, for a fraction of the cost of retiling.
Do not let a fear of renovation costs stop you from getting the leak checked. The inspection is obligation-free, and in four out of five cases, the fix is far simpler than you think.
In Brisbane? Our team handles grout repair Brisbane wide with same-day written quotes. On the Gold Coast, head to our Gold Coast grout repair page to see your local coverage. Prefer to talk? Call 0488 801 015 or book your inspection online. You might be surprised how straightforward the fix actually is.