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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.

Bathrooms are naturally moisture-rich environments, so choose a durable, water-resistant tile for your tub surround. Porcelain and ceramic are two popular options that are also quite affordable. Glass is another good option that’s also low-maintenance—you just need a glass cleaner like you would use on the bathroom mirror. Natural stone tile is porous, but it’s still a viable option if you choose it in a glazed version.

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.

Like glass tiles, you will not need to seal most porcelain tiles, particularly if the porcelain is already glazed. It depends on quality. Porcelain is very water resistant, but it is not 100% waterproof. To avoid staining, some homeowners use a penetrating sealer. It is also a good idea to seal your grout. Unless you use epoxy grout, grout is very porous and can harbor bacteria, mold, and mildew.