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How to Replace Bifold Doors Many home improvement stores offer bifold doors as kits, that include doors and track for installation. The door you purchase should have a total width that is approximately an inch less than the size of the opening that is framed. If your bifold closet doors creep open it could be because of a loose top guide pin for the sliding track or the floor pin that rotates at the bottom may be a bit out of place or missing. These problems are simple and cheap to fix. Cost Bifold doors