An addition that extends a main building.

synoniemen: annex, extension, wing.

Roget 39: adjunct; addition, additament^†; additum [Lat.], affix, appelidage^†, annexe^†, annex; augment, augmentation; increment, reinforcement, supernumerary, accessory, item; garnish, sauce; accompaniment etc. 88; adjective, addendum; complement, supplement; continuation.    rider, offshoot, episode, side issue, corollary; piece [Fr.]; flap, lappet, skirt, embroidery, trappings, cortege; tail, suffix etc. (sequel) 65; wing.    ... meer laten zien

Nederlands: bijgebouw, uitbouw, aanhangsel, bijlage, vleugel, zijvleugel