Drilling through ceramic without cracking it comes down to three things: the right bit, low speed, and patience. A standard twist bit will skate across the glazed surface and likely chip or shatter the tile. With the correct setup, though, ceramic is one of the easier hard materials to drill at home.
Choosing the Right Drill Bit
For standard ceramic tile, a carbide-tipped spade bit works well. Ceramic is made from clay with a thin glazed surface, and carbide can penetrate it smoothly at low speed. For porcelain tile, which is much harder and denser because it’s fired at higher temperatures, you need a diamond-tipped bit instead. Diamond bits grind through the tough glaze rather than cutting it, and they last 5 to 10 times longer than carbide bits in hard materials. If you’re unsure which type of tile you have, a diamond bit will handle both.
Diamond bits cost a bit more upfront but average roughly $0.50 per cut compared to about $0.75 for carbide, so they’re actually cheaper over time if you have several holes to make. Never use a masonry bit or a standard HSS bit on ceramic. They aren’t designed for the hardness of the glaze and will dull immediately or crack the tile.
What You’ll Need
- A variable-speed drill. You need to control RPM precisely. A hammer drill with the hammer function turned off also works, but never use the hammer setting on tile.
- Carbide-tipped or diamond-tipped bit in the diameter you need.
- Masking tape or painter’s tape. This prevents the bit from skating across the glaze when you start.
- Water for cooling. A spray bottle, a wet sponge, or a helper dripping water onto the bit all work.
- A thick wooden board (if drilling a loose tile before installation).
- A marker to mark your hole position.
Preparing the Surface
Mark the exact spot for your hole with a felt-tip pen. Then place an X of masking tape directly over the mark. The tape does two important jobs: it gives the bit something to grip during those first few rotations so it doesn’t wander across the slick glaze, and it reduces the chance of chipping or splintering around the edge of the hole. You should still be able to see your mark through the tape, or you can re-mark on top of it.
If the tile isn’t installed yet, lay it flat on a thick wooden board. This supports the tile evenly and absorbs the force of the bit as it punches through the back. Drilling a tile that’s sitting on a hard surface like concrete, or one that’s only partially supported, is a recipe for a clean snap right through the middle.
Drilling Step by Step
Dampen the tile surface before you begin. This early moisture helps prevent overheating during the critical first seconds when you’re breaking through the glaze. Set your drill to a low speed: 600 to 900 RPM for ceramic, or 400 to 600 RPM for porcelain. If your drill doesn’t have a digital readout, start at the lowest speed setting and increase gradually. Slower is always safer.
Position the bit on your tape mark at a 90-degree angle to the tile. Begin drilling with light, steady pressure. Let the bit do the work. Pushing hard doesn’t speed things up and dramatically increases the chance of cracking. The first few millimeters are the hardest part because you’re grinding through the glaze layer, which is the most brittle section. Once you’re past it, the softer clay body underneath gives way more easily, and you can increase the speed slightly.
Keep water flowing onto the bit as you drill. A continuous drip or a periodic spray from a bottle both work. Water cooling prevents overheating, preserves the sharpness of your bit, and stops micro-cracks from forming in the tile. If you see or smell dust instead of a slurry, stop and add more water. A dry diamond or carbide bit on ceramic generates enough heat to damage both the bit and the tile in seconds.
For thick tiles, drill about a third of the way through, then flip the tile and continue drilling from the other side in the same spot. This reduces the risk of blowout, where the bit punches through the back and chips a large chunk out of the exit side.
Drilling Tile That’s Already on the Wall
The process is the same, but with a few extra considerations. You can’t flip the tile, so blowout on the back isn’t a concern since the adhesive and wall behind it provide support. The bigger challenge is cooling, because water will run down the wall. Some people build a small dam of plumber’s putty around the drill site to hold a small pool of water. Others just have someone periodically squirt water from a spray bottle while they drill.
Once you’ve drilled through the tile, stop. The wall behind the tile is a completely different material, whether it’s drywall, plywood, concrete, or brick, and each one requires a different bit. Swap to the appropriate bit for that substrate before continuing. Trying to push a diamond tile bit through drywall or concrete will either ruin the bit or produce an oversized, sloppy hole.
Common Mistakes That Crack Tiles
Too much speed is the number one cause of cracked tiles. Anything above 900 RPM on ceramic, or above 600 RPM on porcelain, generates excessive heat and vibration. The glaze layer is essentially glass, and glass does not respond well to either.
Drilling too close to the edge of a tile is another frequent mistake. Stay at least half an inch from any edge or corner. The closer you get, the less material is supporting the area around the hole, and the more likely it is to crack along that short distance to the edge. If your mounting hardware demands a hole near an edge, consider drilling into the grout line instead, though you’ll need a masonry bit for that.
Skipping the tape seems minor but makes a real difference. On a glazed surface, the bit will wander before it bites, and that skating motion scratches the glaze even if you eventually get the hole in the right spot. The tape gives instant traction.
Finally, using the hammer or impact setting on your drill is almost guaranteed to shatter ceramic. These settings are designed for masonry and concrete, where impact force helps break through aggregate. Ceramic tile is too thin and too brittle for that kind of force. Use the standard rotation-only mode.
Drilling Ceramic Objects, Not Tile
If you’re drilling into a ceramic pot, vase, plate, or figurine rather than tile, the same principles apply but the stakes are higher because there’s no flat wall behind the piece to provide support. Place the object on a folded towel to cushion it and keep it from sliding. Use a diamond bit, go slowly (start around 400 RPM), and keep water on the contact point at all times. For round surfaces like the bottom of a pot, the tape trick is especially important because the curved surface makes the bit even more likely to wander. Some people start with a very small pilot hole and then step up to their target diameter, which reduces the chance of cracking on curved or uneven surfaces.