The largest of the three domes in the picture opposite measures approximately 12' 7" in diameter and is about 6' 3" high at its center. We recommend building the largest one. All the measurements throughout this web site relate to the largest size. They are fairly inexpensive to build as recycled cardboard is the main component and, if water-based paint is used, can be burned. The domes are strong enough to attach decorative pieces and lighting components to the inside. Assembly time, on site, is 3 to 4 hours for 3 people constructing one dome with the appropriate tools.