Bathroom renovations

• Whether the layout stays the sameSame positions is a refresh
• Which floor it is on, and what is belowGround floor over a basement is accessible
• Whether you want a tub or a showerSwapping a tub for a walk-in shower changes the drain and the waterproofing
• The state of what is behind the tilesAny history of leaks or a soft floor

General guidance, not advice on your own situation. The person you hire decides what applies to it.