I am hanging bifold doors in a closet. What spacing do I need on the sides and in the center ? How much space on the top and the bottom if I have hardwood floors?

How many doors are in your bifold unit? If u are replacing sliding doors with bifold, the doors will have to be cut.

The finished width opening for a 4 door unit is minimum of 5/8'' larger then door unit.

The length of doors is 3/4''less then space between top track and bottom mount.

The space between doors 2 and 3 is about 1/8''

Good luck

Chuck