How to Fix a Pool Tile That Fell Off, Without Draining It

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To fix a pool tile that fell off, chip out 2–3 mm of old bed, butter the tile with underwater epoxy and press it in. One adhesive maker says that is easy under about 60 cm of water; deeper needs a diver or a lower level. Lowering an 8 × 4 m pool 300 mm costs $32.74 to refill in Sydney.

The short answer

The underwater method works for one tile, or a couple sharing a joint, on a concrete-faced pool. One tile adhesive maker’s bulletin says it will never be as good as a repair with the pool empty.
The 60 cm / 2 m rule: under about 60 cm of water you can reach in and fix it; deeper is not practicable without diving gear, and the maker reports repairs done below 2 m by divers.
Cure: the maker’s method weights the tile for 24 hours and allows normal use 3 days later. Cold water below 10°C slows the epoxy; a heated pool speeds it up.
Lowering the water is cheap: 300 mm off an 8 × 4 m pool is 9.6 kL, $32.74 to refill at Sydney Water’s $3.41 a kL; the whole 44.8 kL is $152.77.
A tiler charges $200–$500 for a loose tile on one national guide and $200–$600 for spot tile replacement on a NSW guide, both vendor-published.

The 60 cm / 2 m rule: how to re-fix a fallen pool tile by where it is, the water you would remove from an 8 × 4 m pool at 1.4 m average depth, and what that water costs to replace at Sydney Water’s 2026–27 price of $3.41 a kilolitre (method and cure from one adhesive maker’s technical bulletin and a second maker’s pool tiling guidance; our arithmetic)
Where the tile came off	Method	Water to remove	Refill cost, Sydney	Before swimming
One tile under less than 60 cm of water	Re-fix it underwater with an underwater epoxy: no draining	0 kL	$0	Weight or hold it; the maker’s method leaves the weight 24 hours, then normal use 3 days later
One waterline tile	Either re-fix it in the water, or lower the level about 300 mm and fix it in the dry	9.6 kL to lower 300 mm	$32.74	Follow the adhesive’s data sheet before the water goes back over it
One tile deeper than 60 cm	Lower the water until it is within reach, or pay a diver: the bulletin says deeper water needs diving gear	25.6 kL to lower 800 mm	$87.30	As above
Several loose tiles, or tiles that sound hollow	Drain and repair properly, after checking the water table	44.8 kL, the whole pool	$152.77	For a full tiling job, one adhesive maker says at least 3 days before grouting and 3 weeks before water
Fibreglass or vinyl pool	Not this method: the underwater tile method is only for concrete-faced pools	—	—	Ask the shell’s maker or a repairer

A tile fell off my pool: what to do first

Nothing about one fallen tile is urgent, but three things are worth doing on day one:

Get the tile out of the water and keep it. If it is whole, it is the only exact match you have. If it broke, take a piece to a tile supplier.
Tap the tiles around the gap with the handle of a screwdriver. A hollow, drummy sound means they have let go too. One tile adhesive maker’s bulletin says that if one tile is loose, others might be as well, and a thorough inspection may be called for.
Check the water level for a few days. A falling level points at a leak, which needs finding before any tile goes back, and the bucket test for a leaking pool separates a leak from evaporation.

Then use the table above. One sound gap in a concrete pool is a repair you can do in an afternoon. A row of hollow tiles is a retile, and what it costs to retile a pool or just the waterline has those prices.

The 60 cm / 2 m rule: if the gap is within about 60 cm of the surface, fix it in the water; if it is deeper, lower the water or pay a diver; if several tiles are loose, drain and do it properly.

How to fix pool tiles underwater, step by step

This is the method in one tile adhesive maker’s technical bulletin for re-fixing ceramic tiles underwater in a concrete pool. It covers isolated tiles, or a couple sharing one joint.

Clean the gap. Chisel out any broken tile without damaging the tiles beside it, and remove about 2–3 mm of the old bedding so the new adhesive has a fresh surface.
Butter the tile out of the water. Apply an underwater-rated epoxy to the back of the tile, enough for at least 90% coverage and a bed 2–3 mm thick, with extra around the edges to fill the joints.
Press it in. Push the tile into the gap so the adhesive squeezes out around the edges, and smooth the excess into the grout lines with a wet finger. Do not stir the water around it, or the adhesive starts to disperse.
Hold it. A wall tile has to be held until the bond firms; a floor tile can be weighted. The bulletin’s method leaves the weight 24 hours and allows normal use 3 days later.
One at a time. For several tiles, let each harden before setting the next.

Finish state: the tile sits flush, the joints are full, and it sounds solid when tapped once the epoxy has cured.

Temperature changes the timing. The bulletin says water below 10°C delays the cure and a heated pool speeds it. A general-purpose underwater epoxy putty’s data sheet says it hardens 20–30 minutes after mixing and can be drilled or sanded after 60 minutes, longer below 20°C. A 50 g pack is $20.95 at one national pool and rubber retailer (retailer-published, read 14 October 2026). That putty is sold for underwater repairs to pools and ceramics, not as a tile adhesive, so check the data sheet of whatever you buy says underwater and tile.

The same bulletin says the method is only for concrete-faced pools, and that an underwater repair will never be as good as a full repair with the pool empty. Treat it as a fix that buys time.

Do I need to drain my pool to replace a tile?

Rarely for one tile. Lowering the water is usually enough, and it is cheap. On an 8 × 4 m pool every 100 mm of depth is 3.2 kL. Lowering it 300 mm to expose a waterline tile is 9.6 kL, $32.74 to replace at Sydney Water’s 2026–27 usage price of $3.41 a kilolitre. Lowering it 800 mm to bring a wall tile within reach is 25.6 kL, $87.30. Emptying all 44.8 kL is $152.77.

The water is the small cost. Where the drained water can legally go, and the risk of an empty shell lifting on a high water table, are bigger. Read what it costs to empty and refill a pool, and where the water can go and why a pool lifts out of the ground before you pull the plug. Other cities’ water prices are on what it costs to fill a pool by city.

Once a tile is in the dry, the adhesive’s data sheet governs when the water can go back. For full tiling jobs, one UK tile adhesive maker’s pool guidance says tiles should cure before grouting, usually at least 3 days, and the pool should then be left at least 3 weeks before water goes in, filling no more than 750 mm a day. A single tile in a fast-setting epoxy is a much smaller job, so ask for the product’s immersion time before you start.

The quotable version: lowering an 8 × 4 m pool by 300 mm to fix a waterline tile costs about $33 in Sydney water; draining it costs about $153, plus the risks of an empty shell.

What does a pool tiler charge to replace a tile?

About $200–$500 for a loose tile repair on a national cost guide dated 4 February 2026, and $200–$600 for spot tile replacement on a NSW marketplace guide, depending on the number of tiles, access and whether matching tiles are available. Both are vendor-published.

The NSW guide says a tiler can replace individual tiles underwater in some cases, or the pool may need to be partly or fully drained. Diving work costs more, and we found no published price for it. If the tile is deeper than you can reach, ask for the underwater price and the drain-down price side by side; the water itself is $87.30 for 800 mm on an 8 × 4 m pool in Sydney.

Pay a professional when tiles around the gap sound hollow, when the waterline band is lifting along its length, or when the pool is losing water. Those are a retile or a leak, not a tile. If the pool is near the end of its interior’s life, pool resurfacing cost by interior compares the options, and you can compare pool quotes on identical written scope. Calcium crust along the waterline is a different problem: how to clean calcium off pool tiles.

Common questions

Can you fix pool tiles underwater?

Yes, for one or two tiles on a concrete pool. One tile adhesive maker’s technical bulletin sets out the method: chisel out 2–3 mm of old bed, butter the tile with epoxy, press it in and weight it for 24 hours.

What glue do you use for pool tiles underwater?

An epoxy rated for underwater use. The data sheet for one underwater epoxy putty says it hardens 20–30 minutes after mixing and can be sanded after 60 minutes, longer below 20°C.

How long before I can swim after replacing a pool tile?

For the underwater method in one maker’s bulletin, the weight stays on 24 hours and the tile takes normal use 3 days later. Cold water below 10°C slows it.

Do I need to drain the pool to replace a tile?

Not for one tile within reach. Lowering an 8 × 4 m pool 300 mm is 9.6 kL, $32.74 to refill at Sydney Water’s 2026–27 price of $3.41 a kL. Drain only for several loose tiles.

Why do pool tiles fall off?

The bond between the tile and its bed has failed. One adhesive maker’s bulletin warns that if one tile is loose, others might be as well, so tap the tiles nearby and listen for a hollow sound before fixing just one.

Sources

General information only, current at 2026-10-14. Pool rules differ by state and by council, and penalty amounts are updated regularly. Confirm your own obligations with your council or a registered inspector before acting.

How to fix a pool tile that fell off