Just like any other type of roof, hip roof framing starts by figuring the length and cutting a common rafter. The common rafter will determine the height and length of the ridge board which will establish where the hip rafters are located.
Some of your more expensive custom homes have what I call an interchange roof.
This is the type of hip roof where the main span is one pitch and the ends of the hips are a steeper pitch.
This makes the ridge board longer, making the building appear larger, and the roof steeper than they really are. This adds even more value to the home.