You need at least one 10' high
door to get the machine through. I would make that the one facing the street. The other one I would make just 8' high. 10' of width is ample for both. I have one wash with 12'W X 10'H openings. I have seen no benefit and more costs involved with the oversized openings. The bigger
doors are heavier and harder to raise and let more heat escape when they open.
Doors are a very high maintenance item. Don't put in a huge dollar eater when a smaller dollar eater will do better.