One of the trickiest parts of adding the floating shelves in our duplex kitchens was drilling through the tile backsplash. We had just spent time and money installing that tile and didn’t want to damage it. It felt a little nerve‑wracking at first, but it’s absolutely doable with the right approach and patience. Here’s a clear, step‑by‑step guide to drilling through tile without breaking it, based on our experience.
Ideally, shelf supports should be installed before tiling. We, however, decided on the shelf placement after the tile was up, so drilling carefully into finished tile was unavoidable. We chose a slightly thicker version of the DIY floating shelves we’d already built for another room and set out to make tidy, secure holes in the backsplash.
Tools Needed To Drill Through Tile
To drill through tile without damaging it, gather the right tools. Using appropriate equipment and a steady technique reduces the risk of cracking porcelain or ceramic.
- Power drill
- Various sizes of tile drill bits (diamond and carbide)
- Optional water delivery system guide
- Water cup for cooling
- Painter’s tape
- Paper towels
- Spare tile (optional, for practice)
Most important tip: be patient. Grinding through tile takes time and doesn’t reward rushing.
Step 1: Mark Your Drilling Locations
Before drilling, confirm exactly where you need holes. Since drilling is slow (we averaged about 5–7 minutes per hole), make sure you’re in the right spot. For shelves that need to be anchored to studs, locate studs first.
Because the tile was already installed, our electronic stud finder wouldn’t work through the thick porcelain. We relied on renovation photos, measurements, outlet locations, and drywall mud marks to estimate stud positions. Once we had a general line, we tested shelf height visually by holding up the brackets to make sure the placement looked right and was level.
After confirming the height, we put blue painter’s tape over each drilling point and drilled a small pilot hole through the shelf bracket using a standard bit. That left a tiny mark on the tape to guide the tile drilling.
That tiny mark was enough to pinpoint each hole location and move on to the correct tile bit.
Step 2: Buy The Right Bit
Tile requires a bit designed to grind rather than cut. Diamond drill bits slowly grind through hard materials like porcelain and work well on ceramic, cement, or glass tile too—just verify the bit packaging lists your material. We used a combination of diamond bits and carbide glass & tile bits to get the best results.
Diamond bits wear out over time, so buy a few extras if you anticipate drilling many holes.
Step 3: Make A Practice Hole (Optional)
If possible, practice on a spare tile or a tile purchased from a store that matches your material. Testing first gives confidence that your bits and technique won’t crack the tile. We tested and everything worked fine—nothing shattered—so it was reassuring before working on the installed backsplash.
Step 4: Make A Marking Hole
To prevent losing your marked locations, start with a small carbide bit and make a shallow dent through the painter’s tape. Apply minimal pressure—just enough to create a small pilot indentation. This step helps the larger diamond bit stay centered when you switch to it.
That small pilot hole is all you need to remove the tape and move on to the larger bit without losing your spot.
Step 5: Use Water To Cool The Bit
Water is essential because drilling produces heat and dust that can damage your tile and wear out the bit. Cooling the bit with water prolongs its life and reduces the chance of cracking the tile. We tried a plastic water delivery kit that fits over the tile and drips water onto the bit, but it didn’t drip as slowly as expected. Still, the kit’s guide helped keep the drill steady at the start.
In practice, our simplest solution worked best: keep a cup of cool water nearby and dip the bit into it every 15–20 seconds. That intermittent cooling kept the bit from overheating and minimized dust.
Step 6: Take Your Time
Patience is the most important part of drilling tile. Use light, steady pressure and let the bit grind through the material. Rushing increases heat and the risk of cracking. Our holes took around 5–7 minutes each, so plan for a slow process. It’s far better to spend extra time drilling carefully than to replace a cracked tile.
We finished with clean, secure holes and mounted the floating shelves to each wall without incident. For small 5/16″ screw holes this method works great; the same careful technique applies to larger holes used for plumbing, provided you use the correct bit size and water cooling. Many larger bits also come with or recommend water cooling systems.
When drilling through tile, remember the essentials: mark your studs and heights carefully, use the right bits, keep the bit cool with water, and go slowly. With those steps, you can add shelves, fixtures, or other wall-mounted items to a tiled surface without damaging it.
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