Sectional sofas typically measure 90–109 inches in width, with overall footprints ranging from 94–156 inches depending on the configuration, such as L-shaped, U-shaped, or chaise models. Standard seat depths are 21–28 inches, while deep seating ranges from 28–35+ inches. Common configurations include 2, 3, or 4 pieces with high-density foam, durable fabrics (polyester/linen), and sturdy hardwood frames.