How to Install a Tile Backsplash: Layout, Setting, Grouting

Before you start

Read the cost comparison first if you’re choosing a tile. The short version: ceramic or porcelain subway on a flat painted wall is the right DIY backsplash. Glass, natural stone, mosaic sheets, and herringbone or chevron patterns are where the difficulty jumps — each is doable with practice, but not the job to learn on.

If there’s an existing tile backsplash, removing it is a separate half-day of prying, scraping and drywall repair, and the result has to be flat before you tile. Factor it in or have it done.

Materials and tools

For 30 square feet: tile plus 15% extra (buy it all at once — dye lots vary), thinset or mastic, unsanded grout, grout sealer, color-matched caulk, 1/16 or 1/8 inch spacers, outlet box extenders for every box on the wall, and edge trim for any exposed ends.

Tools: snap cutter, 1/4 inch notched trowel, margin trowel, grout float, two buckets, sponges, nippers, a 2-ft level, and a wet saw rental for the day you’re cutting. The full priced list is on the cost page.

The one thing that matters most

Layout. A backsplash is at eye level and lit by under-cabinet lights; a row that drifts, or grout lines that jog at an outlet, will bother you every morning. Pros spend as much time dry-fitting and marking lines as they do setting tile. Do the same. Once the first row is straight and level and centered where you want it, the rest is repetition.

The steps below cover a standard ceramic subway backsplash. Adjust adhesive and cutting for other tiles as noted.

Step by step

1. Prep the wall

   Clear the counters, turn off the breaker for outlets on the wall, remove cover plates and switch plates, and tape off the counter and cabinet edges. Fill any holes and sand glossy paint lightly so adhesive grips. The wall must be flat: hold a level against it and mark humps or dips over 1/8 inch — skim them with joint compound and let it dry. Tile shows every wave underneath it.

2. Plan the layout

   Measure the wall and dry-lay a row of tile with spacers on the counter to see where cuts land. Center the pattern on the focal point (range or sink) so both ends get equal cuts, and adjust so no sliver cuts under 1 inch end up anywhere visible. Mark a level line for the bottom of the first full row, 1/8 inch above the counter for a caulk joint. Mark a plumb line at the center. These two lines are the whole job.

3. Mix and spread adhesive

   Mix thinset to peanut-butter consistency and let it slake 10 minutes, or open the mastic. Spread a section about 2 sq ft at a time with the flat side of the trowel, then comb with the notched side in one direction at a 45° angle. Don't spread more than you can tile in 15 minutes — skinned-over adhesive won't bond. For glass, back-butter each tile and flatten the ridges so they don't show through.

4. Set the first row on your line

   Press the first full tile into the adhesive on the center line, sitting on the level line, with a slight twist to seat it. Add spacers and work outward in both directions. Check the row with the level as you go, not at the end. Wipe any adhesive that squeezes into the joints before it sets — it's much harder to remove later.

5. Work up the wall, cutting as you go

   Stagger joints for an offset pattern by starting alternate rows with a half tile. Measure and cut each piece as you reach it rather than pre-cutting: walls aren't square and the gap changes. Straight cuts on the snap cutter; L-cuts and notches on the wet saw or with nippers; leave cut edges toward corners and under cabinets where trim or caulk hides them.

6. Cut around outlets and finish the edges

   Mark outlet cuts with the tile held in place, cut so the edge sits 1/8 inch inside the box, and fit box extenders. Install metal edge trim or bullnose tile on any exposed end before tiling up to it. Remove spacers once the adhesive has firmed up (an hour or two), then leave everything alone for 24 hours.

7. Grout

   Mix unsanded grout for joints under 1/8 inch (sanded for wider). Work it diagonally across the tile with the float, packing joints full, then scrape off the excess at a steep angle. After 15–20 minutes, wipe with a damp — not wet — sponge in light diagonal passes, rinsing constantly. Let the haze form, then buff with a dry cloth. Don't grout the joint where tile meets the counter; that gets caulk.

8. Caulk, seal, and reassemble

   Run a bead of color-matched silicone or siliconized caulk along the counter joint and inside corners, tool it smooth with a wet finger. After 48–72 hours, apply grout sealer to the joints (and stone sealer to the whole surface if it's natural stone). Reinstall cover plates over the box extenders, turn the breaker on, and you're done.

What would this cost you? The kitchen backsplash calculator prices the DIY version with the tools you already own and a value on your time, next to a pro quote.