In a draft of "The Bridge of Khazad-dum" Tolkien wrote that the Balrog was "no more than man-sized". A bit later he wrote a note to himself: "Alter description of the Balrog. ... It felt larger than it looked." In the final version the Balrog had this great shadow about it, and it definitely made it seem larger - but its body could not be plainly seen, and it probably wasn't much larger than man-sized. I'd say that 10 feet is the maximum for a Balrog's height.
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