
nebenan
next door
Refers to a place located directly next to another one, for example the neighboring house, apartment, or room.
Das Zimmer nebenan ist noch frei.
The room next door is still available.
next door
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next door
Refers to a place located directly next to another one, for example the neighboring house, apartment, or room.
Das Zimmer nebenan ist noch frei.
The room next door is still available.
The word 'nebenan' (next door) is made up of the words 'neben' (next to) and 'an' (on/at). It literally means 'directly next to it' and is used for places like the neighboring house or room.
Die Bäckerei ist gleich nebenan.
The bakery is right next door.
'Nebenan' (next door) is an adverb and is not declined like a normal adjective. It either stands alone or after the noun it describes. A form like 'das nebenane Haus' is incorrect.
Meine Großeltern wohnen nebenan.
My grandparents live next door.
A very common and useful phrase is 'die Nachbarn von nebenan' (the neighbors next door). It refers to the people who live in the house or apartment directly next to you.
Gestern habe ich meine neuen Nachbarn von nebenan kennengelernt.
Yesterday I met my new neighbors from next door.
next to it / off / additionally
Both words describe a position directly next to something else. daneben usually refers to a specifically mentioned point of reference, while nebenan more often refers to a neighboring room or building. Use daneben when the point of reference is important in the sentence, and nebenan for the neighboring place or building.

Das Café liegt direkt neben der Bäckerei, und die Apotheke befindet sich im Haus nebenan.
The café is right next to the bakery, and the pharmacy is in the building next door.
Das Café liegt direkt neben der Bäckerei, und die Apotheke befindet sich daneben.
The café is right next to the bakery, and the pharmacy is next to it.