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When working on your bathroom floor tiling, you should always tile the floor first and then refit the toilet afterward. This has both practical and visual advantages—the tile will have a better seal, and the installation will look cleaner.

On the other hand, when you try to cut the tiles to fit around the toilet, you’re putting yourself at a disadvantage. It’s a lot more work, it’s hard to be precise, and mistakes or miscalculations can lead to future moisture damage to the tiling, grout, and subfloor.

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.

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.