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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.

The cost to install porcelain tile is about $1,930 on average. Porcelain tile prices range from $880 to $3,000 or more. The average cost tends to be higher than ceramic tile because porcelain tile is very durable. Porcelain tile rating also factors into the material cost. Tile ratings are as follows:

• Grade 0: Walls only

• Grade 1: Walls and light traffic floors

• Grade 2: Rooms with light traffic, but not kitchens or hallways

• Grade 3: Kitchens, hallways, and entryways

• Grade 4: Any area, interior or exterior

• Grade 5: Highest durability good for any area, interior or exterior

To ensure an even and unbending surface to lay tiles on, you’ll typically need to put a subfloor under a tile floor. Fiber cement backboards are the most common choice, but using plywood is also possible. Don’t neglect this step, or you could risk water damage and grout or tiles prematurely cracking or crumbling, especially in an area with high foot traffic. 

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.