How Wide Does A Hallway Need To Be . This leaves you about 4 to 5 inches of floor showing on each side. The bare minimum width, in my opinion, a hallway should be is 42 inches. New home with empty front room (entryway and living room), husband and from www.reddit.com 4.4 the minimum width of all hallways is 3 feet (914 mm). Herein, how wide should a corridor be? Due to a structural column) as long as the reduced.