House plans with two master suites are ideal for households where the home plan requires a second master suite for aging parents or grandparents, grown children, or a roommate. The master suite gives the adults in the house a comfortable retreat, with amenity-packed private bathrooms, walk-in closets, and a large bedroom area. Yet an increasing number of adults have another set of adults living with them. House plans with two master suites can provide privacy for all the adults who live in your home.