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Yes, you can tile over existing tiles in a bathroom, but it is not always recommended. For this method to be successful, the original tile surface must be clean, flat, and free of damage such as cracks, unevenness, mold, or mildew. While tiling over existing tiles can save time and money, there are potential drawbacks. The new adhesive may not bond properly, and the process adds extra weight to the wall or floor. Additionally, the increased height of the surface could interfere with door clearances. For the best and most durable results, removing the old tiles before installing new ones is generally the better option.

Glazed ceramic tiles don’t need to be sealed because the glazing already offers some protection against moisture. Unglazed ceramic tiles need to be sealed to keep the porous tile safe from moisture and staining. However, both types of tile can benefit from sealing. Sealant can make the tiles easier to keep clean and offer more resistance to water, spills, and stains.

For best results, you should remove the toilet in a bathroom before removing tile or installing new tile. If you don’t remove the toilet, it will be harder to fully waterproof the tile around the toilet, which could increase the risk of mold growth or plumbing leaks. If you have trouble removing the toilet, hire a plumber to help.

Many homeowners have successfully retiled a bathroom themselves. It can be a challenging but rewarding process, but it’s best for someone who already has at least intermediate DIY skills.