A leaking shower usually comes from one of three places: a worn tap washer making the rose drip, failed silicone or grout at the junctions, or a broken waterproofing membrane under the tiles. You can change a tap washer yourself, but stains outside the recess, swollen skirting, drummy tiles or a damp ceiling below mean water is escaping the wet area, and that needs a licensed tradesperson.
This guide helps you work out which leak you have, what each fix involves, and what to expect when you call someone in Sydney.
Key points
- A shower rose that drips after you turn it off is a tap washer problem, which Sydney Water lists as homeowner work.
- Most shower leaks that damage walls and floors come from failed silicone, cracked grout or a broken membrane under the tiles.
- Don’t seal over a leaking shower with silicone or grout sealer; it traps water in the tile bed and hides the real fault.
- Water marks outside the shower, loose tiles or a stained ceiling below mean you need a licensed tradesperson to find the source.
Leaking shower terms explained
| Term | What it means | Why it matters |
|---|---|---|
| Waterproofing membrane | A liquid or sheet layer under the tiles that holds water inside the wet area | When it fails, water soaks into walls, floors and framing, and only re-waterproofing fixes it |
| Puddle flange | A collar around the floor waste that the membrane bonds to | It lets water that gets under the tiles drain into the waste instead of the slab; see our puddle flange guide |
| Waterstop angle | A metal or PVC angle at the shower edge or doorway, sealed to the membrane | It stops water tracking under the tiles into the next room; our waterstop angle guide explains placement |
| Floor waste and fall | The drain in the shower floor and the slope that carries water to it | Poor fall leaves water ponding against the walls and grout, where leaks start |
| Grout | The cement or epoxy filler between tiles | Cement grout is porous, so it is not a waterproof seal on its own |
| Silicone (waterproof seal) | A flexible sealant at corners, wall-floor joints, the screen and tapware | These joints move, so silicone rather than grout keeps water out of them |
Leaking shower or dripping shower head? Work out which you have
| What you notice | Where the water goes | Likely cause | Who fixes it |
|---|---|---|---|
| Shower rose drips after you turn it off | Down the drain | Worn tap washer or ceramic cartridge | You (washer) or plumber (cartridge) |
| Water on the bathroom floor outside the screen | Across the tiles | Screen seals, door gaps or poor floor fall | Glazier or licensed tradesperson |
| Dark or crumbling grout near the floor | Into the tile bed | Failed grout or silicone, possible membrane failure | Licensed tradesperson |
| Swollen skirting, door frame or vanity | Through the wall or under the doorway | Failed membrane or missing waterstop angle | Licensed waterproofer or plumber |
| Stain on the ceiling below the shower | Through the floor | Leaking waste, failed puddle flange or membrane | Licensed plumber |
| Wet wall behind the taps, even when the shower is off | Inside the wall cavity | Leaking water pipe or tap body | Licensed plumber |
What you need to check a shower leaking water
| Item | What it’s for | Price band (indicative) |
|---|---|---|
| Torch | Shows hairline cracks in grout and gaps in silicone at low angles | $ |
| Dry towels or paper towel | Lets you dry an area and see exactly where water reappears | — |
| Spray bottle or handheld shower | Wets one zone at a time during a spray test | $ |
| Painter’s tape and a marker | Marks damp patches so you can see whether they grow | $ |
| Phone camera | Records stains and damp patches over a few days for your tradesperson | — |
| Tap washer and jumper valve kit | Fixes a dripping shower rose on compression taps | $ |
4 checks to find where your leaking shower is losing water
These checks only look and test; they don’t open walls or lift tiles. Do them in order, and stop at the first one that shows the source.
1. Check the taps and shower rose
- Turn the shower off firmly and watch the rose for a few minutes; a steady drip points to the tap washer or cartridge.
- Feel the wall around each tap flange after a shower for dampness that spreads beyond the cover plate.
- Check the cover plates for a missing silicone bead, since water can run behind them into the wall.
- Look under the shower arm flange for drips or staining that suggest a fitting leak behind the tiles.
- Change the tap washer if the rose is the only drip; our tap washer guide walks you through it.
2. Inspect the silicone and grout
- Dry the shower fully, ideally overnight, so fresh moisture shows up clearly in the next steps.
- Run a torch along every corner and the wall-floor joint, looking for split, peeling or mouldy silicone.
- Check grout lines for cracks, holes or dark patches that stay damp long after the rest has dried.
- Press on floor tiles near the waste and walls; a hollow sound or movement suggests water under the tiles.
- Photograph anything suspicious so you can show your tradesperson exactly where the problem started.
3. Spray-test the screen and walls
- Close the screen door and spray only the glass and seals for a few minutes, keeping the walls and floor dry.
- Check outside the screen for water escaping at the hinge side, the door sweep or the base channel.
- Next, spray one wall at a time and check the room behind or below for new damp patches.
- Mark any damp patch with painter’s tape and note which zone you sprayed when it appeared.
- Repeat over a couple of days, because slow leaks can take hours to show through plaster or a ceiling.
4. Check the floor falls and waste
- Run the shower and watch where water travels; it should head straight to the grate without pooling.
- Look for puddles left near walls or the doorway after the shower is turned off and the floor drains.
- Lift the grate and check the waste is clear, as a slow drain lets water sit against the grout; see how to clean a shower drain.
- Check the grout around the grate for cracks, since that joint sits right over the puddle flange.
- Note any musty smell from the waste, which can point to a leaking or dry trap; see our bathroom drain smell guide.
How to fix a leaking shower: DIY or licensed tradesperson?
| Fix | What it involves | DIY or licensed tradesperson |
|---|---|---|
| Change the tap washer | Swap the jumper valve and washer in a compression tap | DIY, per Sydney Water’s homeowner guidance |
| Clean a slow floor waste | Remove hair and soap build-up from the grate and trap | DIY at the grate; plumber for blockages in the pipe |
| Replace screen seals | Fit new door sweeps and seals to the glass | DIY or glazier |
| Cut out and replace silicone or grout | Remove failed joints and refill them once the cause is confirmed | Licensed tradesperson when the shower is leaking |
| Replace a ceramic cartridge or tap body | Work inside the tap assembly or wall cavity | Licensed plumber |
| Repair the puddle flange or waste | Lift tiles around the waste and reseal it to the membrane | Licensed plumber |
| Re-waterproof the shower | Strip tiles, renew the membrane to AS 3740, then retile | Licensed waterproofer and plumber |
Sydney Water lists changing a tap washer as work a homeowner can do. Replacing showers, repairing leaks in private water pipes and renovations need a licensed plumber.
How to fix a leaking shower tile floor
- A tradesperson confirms the source first, using moisture readings and controlled water tests rather than guessing from stains.
- Loose or drummy floor tiles near the waste are lifted to check whether the puddle flange and membrane are bonded.
- Poor fall is corrected by re-screeding the floor, because new tiles laid on the same slope will pond again.
- A failed membrane is stripped and renewed to AS 3740, including upturns at the walls and the waterstop angle.
- The floor waste is resealed to the new membrane, so any water under the tiles drains away rather than into the slab.
- Older Sydney bathrooms often have no membrane at all under a tiled floor, so a leaking shower floor there usually means a full rebuild.
Sealing shower tiles and regrouting: what they can and can’t fix
- Grout sealer reduces staining and water uptake on sound grout, but it doesn’t make a leaking shower watertight.
- Regrouting replaces cracked or crumbling joints, yet water already under the tiles stays trapped once the new grout goes in.
- Silicone belongs in moving joints, such as corners, wall-floor junctions and around the screen; our clear silicone sealant guide covers the types.
- Sealing leaking shower tiles from the top only works when the membrane underneath is intact and the tile bed is dry.
- Have the cause confirmed before any regrout, because sealing over a failed membrane hides the leak while the damage spreads.
- Routine care you can do is cleaning grout gently and keeping silicone free of mould, so faults are easy to spot early.
Shower fall calculator: is your shower floor draining properly?
- The fall is the slope from the walls to the floor waste, and the NCC and AS 3740 set the requirements for it in wet areas.
- An online shower fall calculator gives a target slope, but your tradesperson confirms it on site with a level across the tiles.
- The quickest homeowner check is to watch the water; it should run to the grate without stopping or pooling against walls.
- Water pooling at the doorway or screen line means the fall runs the wrong way, and the floor needs regrading.
- Hob-less and step-free showers rely heavily on fall and a correctly placed waterstop angle or linear grate; see our shower floor waste guide.
- Don’t try to fix fall with extra grout or silicone; it needs the tiles lifted and the screed reshaped.
Shower reglazing vs regrouting vs re-waterproofing
| Option | What it is | Fixes a leaking shower? | Best for |
|---|---|---|---|
| Shower reglazing | A new surface coating sprayed over a shower base, bath or tiles | No; it’s cosmetic | Tired-looking but watertight showers |
| Regrouting and resealing | New grout and silicone in failed joints | Only if the membrane is intact | Early grout and silicone failure |
| Puddle flange or waste repair | Resealing the waste to the membrane | Yes, when the leak is at the waste | Ceiling stains directly below the grate |
| Re-waterproofing | Stripping tiles and renewing the membrane | Yes, it fixes the root cause | Water damage outside the wet area |
| Full bathroom renovation | Rebuilding the room, including plumbing | Yes | Older bathrooms with no membrane |
Why showers leak: causes and fixes
| Cause | Sign you’ll notice | Fix | DIY or plumber |
|---|---|---|---|
| Worn tap washer | Rose drips after the shower is off | New washer and jumper valve | DIY |
| Failed silicone at the wall-floor joint | Mould line, damp skirting outside the recess | Cut out and reseal once dry | Licensed tradesperson |
| Cracked grout and drummy tiles | Dark grout, hollow tiles near the waste | Lift tiles, check membrane, retile | Licensed tradesperson |
| Failed membrane | Swollen door frames, stains in the next room | Re-waterproof to AS 3740 | Licensed waterproofer |
| Leaking waste or puddle flange | Stain on the ceiling under the grate | Reseal or replace the waste | Licensed plumber |
| Leaking pipe or tap body in the wall | Damp wall when the shower hasn’t run | Pipe repair and leak detection | Licensed plumber |
What not to do with a leaking shower
- Don’t silicone over old silicone; the new bead won’t bond, and water keeps running behind it.
- Don’t apply grout sealer to wet or cracked grout, because it traps moisture in the tile bed.
- Don’t keep using a shower that’s staining the ceiling below, as wet plaster can sag and timber framing can rot.
- Don’t lift tiles or cut into the wall yourself; you can damage the membrane and the pipes behind it.
- Don’t rely on reglazing to stop water, since a surface coating doesn’t repair anything underneath.
- Don’t accept a “just regrout it” quote without a moisture test showing where the water is actually going.
When to call a licensed tradesperson for a leaking shower
- Water appears outside the shower recess on skirting, door frames, carpet or the room next door.
- A stain or bubble shows on the ceiling below the bathroom, especially directly under the waste.
- Floor tiles sound hollow or move when you press them near the waste or along the walls.
- A wall stays damp when the shower hasn’t run, pointing to a pressurised pipe or tap body leak.
- Your water bill jumps for no reason, which can mean a hidden leak somewhere in the supply.
- Mould keeps returning on grout and silicone within weeks of cleaning, a sign of moisture behind the tiles.
Sydney Water says replacing showers and repairing leaks in private water pipes need a licensed plumber. Use a licensed tradesperson for any waterproofing, and check their details with our NSW licence check guide.
What a leaking shower repair costs in Sydney
| Service (Sydney, Oct 2026, incl. GST) | Price range | Typical |
|---|---|---|
| Plumber call-out fee | $69–$170 | $140 |
| Plumber hourly rate | $92–$230 | $140 |
| After-hours hourly rate | $170–$345 | $255 |
| After-hours or emergency visit | $290–$805 | $520 |
- The final cost depends on the source; a tap repair is a short visit, while re-waterproofing means stripping and retiling.
- Ask for an itemised quote after leak detection, so you pay for the actual fault rather than a guess.
- Ask for a Certificate of Compliance on plumbing work; it confirms the job meets the Plumbing Code of Australia.
- Compare labour rates in our Sydney plumber cost guide before you accept a quote.
How to stop your shower leaking again
- Squeegee the walls and floor after each shower so water doesn’t sit on grout lines and silicone joints.
- Inspect silicone every few months and have split or mouldy joints replaced before water gets behind them.
- Keep the floor waste clear of hair, because a slow drain holds water against the lowest grout joints.
- Use a pH-neutral cleaner on grout, as harsh acids and bleach break down grout and sealers over time.
- Fix dripping taps quickly, since constant water at the rose and floor speeds up grout wear.
- Insist on a compliant membrane when you renovate; our bathroom waterproofing guide covers what to ask.
Leaking shower FAQs
How do you fix a leaking shower?
Start by finding the source. A rose that drips after you turn it off usually needs a new tap washer, which you can change yourself. Water escaping onto walls, floors or the ceiling below points to silicone, grout, the waste or the membrane, and a licensed tradesperson should diagnose and repair it.
How do you fix a leaking shower tile floor?
A leaking shower floor is fixed from underneath the tiles. A tradesperson lifts the affected tiles, checks the membrane and puddle flange, corrects the fall if water ponds, then re-waterproofs and retiles. Regrouting the surface alone rarely works, because water already in the tile bed keeps escaping.
How do you seal leaking shower tiles?
Sealing only helps when the membrane under the tiles is intact. Failed grout and silicone are cut out, the area is left to dry, then joints are refilled and silicone is applied to corners and junctions. If the shower is already leaking, have the source confirmed first so you don’t seal water in.
How do you regrout a bathroom?
Old grout is raked out without chipping tile edges, the joints are cleaned and dried, and new grout is pressed in and sponged off. Corners and changes of plane get silicone, not grout. In a leaking shower, regrouting comes after the leak is diagnosed, never instead of it.
How do you seal shower tiles?
On a sound, dry shower, clean the grout thoroughly, let it dry, then apply a penetrating grout sealer along the joints and wipe excess off the tiles. Keep silicone joints in good condition at the corners. Sealer cuts staining and water uptake, but it can’t fix a broken membrane.
How do you fix a shower leak inside the wall?
A leak inside the wall, from a pipe, tap body or shower arm fitting, needs a licensed plumber. Sydney Water lists repairing leaks in private water pipes as licensed work. A plumber pinpoints the leak, opens the smallest possible section of wall, repairs the pipe and makes sure the waterproofing is restored.
Getting a leaking shower fixed in Sydney
If your checks point beyond a worn tap washer, the leak is in the waste, the pipes or the waterproofing. TQN Plumber’s licensed Sydney plumbers find shower leaks with non-invasive testing, then quote the repair itemised before work starts. We’ll tell you whether a reseal will last or the membrane needs renewing. Book shower leak detection.
