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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.

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.

You can, in theory, tile your fireplace hearth with most tiles. However just because you can, doesn’t mean you should. For example, it’s much better to use unglazed tiles because glazed tiles are more resistant to cracking under extreme heat. Porcelain is more heat-resistant than ceramic, but you can still design the hearth as you like by putting the most heat-resistant tiles directly under the fire and, if it matches your style, add more decorative tiles further from the center of the fire. 

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