In this article I explain the tools needed, and then the steps involved with tiling over existing tile. I highlight the situations where this is a viable option, and when it may be not optimal to use.

Supplies: 

Cheap paint roller and brush 

Priming agent (I recommend Schluter Primer U)

Painters tape

Painters plastic

Proper size Notch Trowel 

Water

An adhesive (either thinset or mastic for backsplashes, and thinset only for floors)

Grout

Sponges 

Mixing drill with mixing bit

Spacers (if applicable)

Tile/Grout Sealer (Optional)

1. Assess Existing Tile Condition

   - Check for hollow spots, cracked grout joints, mold, and loose tiles. Seek professional advice if issues are present, as they may indicate improper installation.

2. Prepare Surrounding Areas

   - Protect adjacent areas with painters tape and plastic before priming.

3. Prime Existing Tile Surface

   - Apply a suitable primer (e.g., Schluter Primer U, Mapei ECO Prim Grip) to the existing tile surface.

4. Plan Tile Layout

   - Lay out the tile pattern/design before starting the installation.

5. Prepare Adhesive

   - Mix thinset (if applicable) using a drill and mixing bit.

6. Apply Adhesive to Wall

   - Spread adhesive (thinset or mastic) on a small area, ensuring ridges go perpendicular to the tile's longest side.

7. Tile Installation

   - Place tiles on the adhesive, collapsing ridges for maximum coverage. Use spacers and repeat until the entire area is tiled.

8. Grout Application

   - Once adhesive sets, grout the tiles using the preferred color and brand.

9. Follow Grout Instructions

   - Adhere to grout instructions; consider optional sealing for both tile and grout for added protection.

10. Admire Your Finished work

- this is the most satisfying step of the process, enjoy your new tiled area that you completed all by yourself!