There is disclosed an extendable sofa comprising a frame having a seat support portion, a back-support portion, and a cushion storage compartment, wherein the frame is adapted to extend and collapse length-wise between a collapsed configuration and an extended configuration. A primary seat cushion adapted to rest upon the seat support portion of the frame when in the frame is in the collapsed configuration. An auxiliary seat cushion adapted to be stored in the cushion storage compartment when the frame is in the collapsed configuration and adapted to rest upon the seat support portion when the frame is in the extended configuration. At least one primary back cushion adapted to rest against the back-support portion of the frame when the frame is in the collapsed configuration. At least one auxiliary back cushion adapted to be stored in the cushion storage compartment when the frame is in the collapsed configuration and adapted to rest against the back-support portion when the frame is in the extended configuration.