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.

The reasons not to install flooring underneath a bathtub outweigh the benefits. A properly installed bathtub will keep water from reaching the unprotected subfloor underneath. Installing a tub on top of finished flooring can lead to damage and scratches to the new floor. Also, a small leak from a tub drain may be more difficult to notice if finished flooring impedes water drips.

No, you don’t need to remove the old grout before installing new tile over existing tile. In fact, the old grout helps fill in gaps between tiles, creating a more even surface for the new layer. However, it's important to ensure that the grout is clean, solid, and free of cracks or crumbling areas. Damaged grout should be repaired or replaced before proceeding. Cleaning the surface thoroughly and filling any low spots will help the new adhesive bond properly and ensure a smooth, stable installation.

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.