Replace a Cracked or Broken Bathroom Tile

Bathroom tiles take abuse. Water pressure, temperature swings, impact from dropped bottles, and underlying structural movement all conspire to crack them. A single cracked tile doesn't require you to regrout the whole wall—you can surgically remove and replace just the bad one. The trickiest part isn't the removal; it's knowing when to stop chiseling so you don't damage the surrounding tiles or the substrate beneath. Done right, your patch will be invisible once grouted. The key is matching the tile size and color, and working patiently through the grout removal phase.

1. Shut Down Water First. Before you start, turn off the water supply to the bathroom at the valve under the sink or at the main shutoff. Lay down a drop cloth or towels beneath the work area to catch debris and broken tile shards. Wear safety glasses—tile fragments will fly when the tile breaks, and you need eye protection.
2. Score Grout Lines Deep. Use a grout saw or a rotary tool fitted with a grout-cutting bit to cut out the grout along all four sides of the damaged tile. Cut deep enough to expose the grout completely—about a quarter-inch deep. You're not trying to remove all the grout yet; you're just breaking the seal so the tile can come free without pulling away the surrounding tiles. Work slowly and let the tool do the work.
3. Break Grout Bond Carefully. Switch to a cold chisel or old putty knife and tap along the grouted edges with a hammer. Start at the corners of the tile and work around the perimeter. The goal is to break the grout bond, not to dig deep into the wall. Work from the grout lines toward the tile edge, not the other way around. Listen for the sound to change from solid to hollow—that tells you the grout is failing.
4. Pry With Patience. Once the grout is loose, insert a flat pry bar or old putty knife under the edge of the tile and gently work it back and forth to break the thinset bond underneath. The tile should start to flex slightly. Keep pressure even; if one corner lifts much faster than the others, stop and work the other edges first. Take your time here—rushing this step breaks neighboring tiles. When the tile is mostly free, pop it out by hand.
5. Scrape Clean To Bare. Once the tile is out, scrape away all old thinset and grout from the wall or floor substrate using a putty knife or grout scraper. The surface must be flat, clean, and free of dust. If the substrate is crumbling drywall (in a non-wet area) or damaged cement board, patch it with alkali-resistant drywall or cement board rated for the room's moisture level before continuing. Wipe the area down with a damp cloth and let it dry completely—at least 15 minutes.
6. Dry-Fit For Flush. Place the replacement tile (dry, no mortar) into the opening to confirm it fits. The tile should sit flush with the surrounding tiles—not proud (sticking out) or recessed (sunk in). If it doesn't sit flush because the substrate is uneven, you'll need to build up the thinset on the low side or grind down the substrate. Adjust now; don't rely on grout thickness to fix gaps.
7. Trowel Ridges Right. Mix a small batch of thinset mortar according to the manufacturer's instructions—it should look like peanut butter, not soup. For a single tile, you need only enough to fit in your palm. Using a notched trowel held at a 45-degree angle, spread thinset onto the back of the tile in thin ridges. For wall tiles, use a small square-notch trowel (1/4-inch); for floor tiles, use a larger one (3/8-inch). Cover the entire back surface with ridges, not a solid coat.
8. Press And Level Fast. Press the tile firmly into the opening, twisting it slightly as you push to bed the thinset. Check that the tile is level and flush with the surrounding tiles using a small level or straight edge. If it's too high, tap it down gently with a rubber mallet. If it's too low, pull it out and add more thinset. Work quickly—thinset begins to set within 10 minutes. Once the tile is set, wipe away any excess thinset from the grout lines with a damp sponge.
9. Wait Twenty-Four Hours. Do not grout, disturb, or use the tile for at least 24 hours. Check the thinset manufacturer's recommendation—some fast-set products only need 12 hours, but standard thinset needs a full day. If the bathroom is humid, open a window and run a fan. Keep the area dry.
10. Fill Joints Completely. After thinset has cured, mix grout to a thick, uniform consistency. Use a small grout float to pack grout diagonally into the joints around the new tile, pressing firmly so the grout fills completely. Work in multiple directions to ensure no voids. Then, holding the float at a low angle, drag it diagonally across the surface to remove excess grout. Work when the grout is firm but not rock-hard—this takes judgment that comes with practice.
11. Shape Joints Lightly. After 30 minutes (check the grout bag), when the grout is nearly set but still slightly soft, use a damp grout sponge or a small piece of foam to wipe across the joints. Keep the sponge slightly damp, not dripping wet. Make smooth, diagonal passes to shape the grout line and remove haze. Rinse the sponge frequently. The joints should be smooth and slightly concave.
12. Seal After Full Cure. Allow grout to cure for the time specified on the bag—typically 48 to 72 hours. During curing, keep the area dry and out of use. Once fully cured, if you used unsanded grout in narrow joints or if the grout is porous, apply a grout sealer following the product instructions. For bathrooms, a grout sealer is worth the extra step to prevent staining and water infiltration along the joints.