1 Kings 6:9,10 - Joseph Benson’s Commentary on the Old and New Testaments

So he built the house, and finished it That is, the walls of the house. And then he built chambers There is nothing in the Hebrew for the word then, which being omitted, the sense is, that he here gives an account of the height of these chambers, as, 1 Kings 6:6, he did of the breadth. But it is very briefly; and we are to understand that those below, and those in the middle, and those above, were all of an equal height, namely, five cubits. So they were fifteen cubits in all, which was five less than the height of the house, for that was twenty cubits; otherwise there would have been no room for the windows, which, it is probable, were above all these chambers, in the top of the house.