Within the same house. It's pretty rare to have all my brothers and sisters under one roof, so it really does feel like a special occasion.At our new office, we will have dental, dermatological, and primary health care all under one roof!See also: one, roof
under one/the same ˈroof
(informal) in the same house, etc: There were three generations of the family living under one roof.See also: one, roof, same