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Grout lines should typically be between 1/8 to 3/16 inch thick. This ensures enough room for the grout to dry properly and makes them wide enough to look clean and professional. If grout lines are too small, it can be easier to see imperfections in the spacing. 

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.

To make a bathroom look bigger, choose light-colored, medium- to large-format tiles. Light colors such as white, cream, or light gray make a space feel more open, while dark colors, busy patterns, and small tiles can make a bathroom feel smaller. It may seem counterintuitive, but small tiles can shrink a room visually due to the increased number of grout lines. Using medium- to large-format tiles creates a more seamless look. For the best effect, pair your light-colored tiles with a matching or similarly colored grout. This minimizes the grid-like pattern and gives the floor and walls a more continuous, uninterrupted appearance, helping the room feel significantly larger.

The tile trim you use will depend on a few factors, including design preferences, budget, and whether the project is DIY or not. You might choose plastic trim if you want an easier DIY job that is more budget-friendly. There are also more color options available in plastic. On the other hand, you might choose metal to match your fixtures or for areas with heavy use.