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You can technically install tile over tile, but we don’t suggest it. Installing tile over any surface that isn’t a completely flat and prepared subfloor will result in a shoddy overall job, uneven flooring, tiles that don’t adhere, extra weight, gaps, cracks, and room for moisture and dirt to enter. For the best results, only install new tile on a flat, sanded surface like subflooring or concrete that is prepared for tile.

If you have asbestos tile and would rather tile over it than remove it, or if your existing tile is completely flat and bonded tightly to the floor, you may be able to tile over existing tile. But experts recommend thinking twice before you do.

It’s best to install a shower door after the bathroom tile is in place to ensure you have accurate measurements. If you try installing a shower door first, the tile might be too thick to install afterward, or the tile will be too thin and create a gap between the shower doors that allows water to leak. With the tile in place first, you’ll know the exact shower door size that you need.

The difference between floor and wall tiles is that floor tiles generally have higher strength and porosity ratings than wall tiles. Wall tiles are typically weaker and more likely to crack or become damaged under sustained pressure like high foot traffic. 

For this reason, avoid using wall tiles on floors and vice versa.

Yes, you can tile a shower as a DIY project, and you can save hundreds of dollars in labor costs by doing so. However, you’ll need to rent or buy quite a few tools and supplies for the job, including a saw, tile nippers, and a new shower pan. In terms of the work itself, you should be prepared to tackle a variety of different tasks, including measuring and ordering materials, removing old tile, waterproofing the wall, adding rows of tile, grouting, and more.