A sofa is built from the inside out, starting with a sturdy frame made of hardwood or engineered wood. The pieces of the frame are meticulously joined using screws, glue, or mortise and tenon joints to ensure stability and longevity. The construction includes a spring system for support, which can consist of serpentine springs, rubber webbing, or eight-way hand-tied coils, each providing different levels of comfort and resilience. Once the frame and spring system are in place