NET
16 Make a roof for the ark and finish it, leaving 18 inches from the top. Put a door in the side of the ark, and make lower, middle, and upper decks.
Darby
16 A light shalt thou make to the ark; and to a cubit high shalt thou finish it above. And the door of the ark shalt thou set in its side: [with] a lower, second, and third [story] shalt thou make it.
KJV
16 A window shalt thou make to the ark, and in a cubit shalt thou finish it above; and the door of the ark shalt thou set in the side thereof; [with] lower, second, and third [stories] shalt thou make it.