An extendible sofa has a base assembly, a slide out assembly and a seat assembly. The base assembly has a base assembly frame that forms a seat, and the base assembly frame has a guide. The slide-out assembly is slidably connected to the base assembly by way of the guide. The guide facilitates movement of the slide-out assembly between a compact position and an extended position in which the slide-out assembly extends out away from the base assembly to provide additional seating. The slide-out assembly has a seat guide. The seat assembly has a seat frame slidably connected to the seat guide, and the seat guide facilitates movement of the seat assembly between a stowed position in which the seat assembly is housed within the slide-out assembly and a seat position.