Hi, Thanks for the question. The total height of columns are 10'-10" from the deck they are resting on to the beam they are visually supporting. The top of the central shaft is 14.5" dia and tapers down to the base of the column which is 17.5" dia. Please take into consideration the size of the columns are directly proportional to the size and scale of the home and the style of the column. Many columns can be visually too small or too large. Good luck with your project.