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Three-bay garages are normally freestanding structures, but they can also be attached to homes the way conventional garages are if the land parcel is of adequate width and depth. The garage doors can be separated for individual access to each bay, or you can have one door that covers all bays. Some three-bay garages have windows in the doors and walls and others have none, which prevents potential thieves from viewing the contents and assessing their value.

https://www.hunker.com/13425523/what-is-a-3-bay-garage
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New construction focuses on convenience and luxury more than ever before, and that translates to multiple garage bays. The majority of today’s average homes have room for two or three cars, figuring that owners commute and have errands to run. A single vehicle used to cut it, but families have chosen to divide and conquer as their lives have gotten more complicated. A two-income household almost certainly opts for two or more garage bays so each person can go to work independently, but even those who work from or at home have to go out for meetings, groceries, and to shuttle kids or pets around. We assume there should be a garage bay per adult in the home, so as a family grows and teenagers get their licenses, they might look for a home with more garage space.
https://www.thehousedesigners.com/articles/home-buying-basic...