NET

7 The side chambers surrounding the temple were wider at each successive story, for the structure surrounding the temple went up story by story all around the temple. For this reason the width of the temple increased as it went up, and one went up from the lowest story to the highest by the way of the middle story.

Darby

7 And for the side-chambers there was an enlarging, and it went round about [the house] increasing upward; for the surrounding of the house increased upward round about the house; therefore the house had width upward, and so ascended [from] the lower [story] to the upper, by the middle one.

KJV

7 And [there was] an enlarging, and a winding about still upward to the side chambers: for the winding about of the house went still upward round about the house: therefore the breadth of the house [was still] upward, and so increased [from] the lowest [chamber] to the highest by the midst.