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Yes, you can tile over existing shower tiles, but it's better to remove the old tiles first for the best results. Tiling over existing tiles requires a clean, level surface and proper adhesion. If the old tiles are in good condition, you can roughen the surface to improve adhesion. However, removing the old tiles ensures a smoother, longer-lasting finish and prevents potential issues down the line.

Your floors should be completely level for tile, otherwise you risk damaging the tiles in the future. When there are even small gaps or hills in the subfloor beneath the tile, this puts more pressure on the tile when you walk around on the floor. With repeated traffic, the tiles are at risk of cracking, and you’ll have to deal with tile repairs sooner than if the floor was completely level.

When tiling over concrete, you should install an anti-fracture membrane after the concrete has been prepared. The anti-fracture membrane acts as a moisture barrier and should be installed to protect the tiles from moisture which helps maintain their integrity. Often, Ditra, a brand name, is used interchangeably with moisture barrier.

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.