Jamieson, Fausset and Brown on 2 Kings 4:10

10. Let us make a little chamber--not build, but prepare it. She meant a room in the oleah, the porch, or gateway (2Sa 18:33; 1Ki 17:19), attached to the front of the house, leading into the court and inner apartments. The front of the house, excepting the door, is a dead wall, and hence this room is called a chamber in the wall. It is usually appropriated to the use of strangers, or lodgers for a night, and, from its seclusion, convenient for study or retirement.