next–door 
/ˈnɛkstˈdoɚ/ adjective
always used before a noun /ˈnɛkstˈdoɚ/ adjective 1 : living in the next house, apartment, room, etc.
▪ We've been next-door neighbors for the past 30 years. 2 : next to your or someone else's house, apartment, room, etc.
▪ the next-door house
▪ We've been next-door neighbors for the past 30 years.
▪ the next-door house
