Yes, you can tile onto a painted wall — but it takes the right prep work to ensure long-lasting results. The key is assessing the condition and type of paint and making sure the surface is stable and ready for tiling.

Here’s a step-by-step guide to help you get it right:

1. Check the Condition of the Existing Paint

Before tiling, take a close look at the painted surface:

• Peeling or Flaking Paint:
  If the paint is coming off, it needs to be completely removed. Tiles won't bond properly to an unstable surface.
• Type of Paint:
  Some paints (like emulsion) may not interact well with tile adhesives. In these cases, it's best to strip the paint entirely.
• Surface Texture:
  Tiling requires a smooth, stable surface. If the wall is textured, consider smoothing it down.

2. Prep the Wall for Tiling

Proper preparation is everything. Follow these steps:

• Remove Unstable Paint:
  Scrape, sand, or use a chemical stripper to get rid of any unsuitable or peeling paint.
• Sand Glossy Surfaces:
  If the paint is solid but has a shiny finish, sand it to create a dull surface that adhesive can grip.
• Apply a Primer:
  Use a primer specifically designed for tile installation. This helps improve adhesion and create a stable base.
• Score the Surface (if needed):
  For very smooth paint, lightly scoring the surface with a scraper can improve grip.
• Clean Thoroughly:
  Remove all dust, grease, and debris. A clean surface is essential for strong adhesion.
• Level the Wall:
  Fill any holes or imperfections with a patching compound and sand until smooth and even.

3. Tiling the Wall

Now you're ready to tile:

• Choose the Right Adhesive:
  Use a high-quality adhesive that's suitable for painted surfaces and the type of tile you're using.
• Apply Properly:
  Spread the adhesive evenly and make sure each tile is firmly pressed in place to avoid weak spots.

4. Watch Out for Common Issues

• Paint Failure:
  If the paint wasn’t properly prepared, it can peel under the weight of the tiles, leading to tile failure.
• Adhesive Compatibility:
  Not all tile adhesives are designed for painted surfaces. Check the manufacturer's recommendations before you start.

Final Thoughts

Tiling over a painted wall is definitely doable — as long as you prepare the surface correctly. Rushing this step can lead to tiles coming loose later on. If you’re unsure whether your wall is suitable or want peace of mind, it’s always a good idea to consult a professional tiler.