How to Drill Through Tile Without Cracking It

One challenge when building the floating shelves in our duplex kitchens was drilling through the tile backsplash. After investing time and money installing beautiful tile, we didn’t want to damage it. It was a little nerve-wracking, but entirely doable. Here’s how we approached it.

Ideally we would have installed shelf supports before tiling, but we couldn’t agree on placement until after the tile was done. Once we decided, we built a chunkier version of the floating shelves we previously made for our bonus room and prepared to drill through the finished backsplash.

Tools Needed To Drill Through Tile

Drilling through a tile backsplash requires a few special tools and supplies. Have these on hand before you begin:

• Power drill
• Various sizes of tile drill bits (diamond or carbide)
• Water delivery system or a simple water cup
• Painter’s tape
• Paper towels
• Spare tile (optional, for practice)

And the number one tip: take your time. Drilling tile is slow work and rushing increases the risk of cracking the tile.

Step 1: Mark Your Drilling Locations

Start by confirming exactly where you need to drill. Since drilling through tile is slow (we averaged about five to seven minutes per hole), make sure your placement is accurate. For floating shelves, that means locating studs behind the wall for secure anchoring.

We had to do a little detective work because our stud finder didn’t work through the thick porcelain. Renovation photos, measurements, outlet locations, and drywall mud marks helped us identify stud locations. Once you’ve found studs and chosen shelf height, hold the bracket in place, check for level, and mark the drilling points.

We placed painter’s tape over the tile at each stud location, then drilled lightly through the shelf bracket with a small standard bit to leave a precise mark on the tape. That small mark became our pilot location for the tile drilling.

With accurate marks in place, you’re ready for the right drill bit.

Step 2: Buy The Right Bit

Tile requires a different approach than wood. Diamond-tipped bits grind through hard surfaces rather than cutting. For porcelain, ceramic, cement, or glass tile, use a diamond or carbide bit designed for that material. We used a combination of diamond and carbide bits and found them effective. Note that diamond bits wear down over time, so keep spares if you have many holes to drill.

Step 3: Make A Practice Hole (Optional)

Before working on your installed tile, practice on a spare tile if you have one. We tested our bits on a spare tile; nothing cracked and it gave us confidence. If you don’t have a spare, you can buy a single tile at a hardware store to test on first.

Step 4: Make A Marking Hole

To keep your drilling location accurate, first use a small carbide bit to make a tiny dent through the painter’s tape. Apply minimal pressure and drill slowly to create a small pilot mark. That dent is enough to guide the larger bit and prevents the bit from wandering when you start the main hole.

Once the pilot dent is visible, remove the tape and move on to the larger bit.

Step 5: Use A Water Delivery System

Water cools the bit and suppresses dust, which reduces stress on both tile and bit. We tried a commercial water delivery cup system that fits over the tile and is intended to supply a slow drip of water. While it helped stabilize the bit and act as a guide, the drip feature didn’t work as expected for us. Instead, we relied on a simple cup of cool water and dipped the bit every 15–20 seconds to keep it cool.

The box kit was still useful as a guide early in the process, but a steady hand and periodic cooling with water worked well for us.

Step 6: Take Your Time

Patience is essential. Use light, steady pressure and let the bit grind through the tile. Rushing increases the chance of chipping or cracking. Our holes took roughly five to seven minutes each, and the total drilling time added up, but the careful approach prevented any broken tiles. In the end we mounted our floating shelves securely to the studs.

If you need larger holes—for example, for plumbing—use appropriately sized tile bits and the same careful method. Many large bits are available with their own water systems, but regardless of size, take your time and prioritize control over speed.

With the right tools, a steady hand, and patience, drilling through tile for shelving or fixtures is completely achievable without damaging your backsplash.