Folding Queen Size Sleeper Sofa Bed,Convertible Sofa with Three Ottomans. $289.99. Was: $399.99. Free shipping. 13 sold. or 3 Seater Sofa Sets. $345.00. Free Decide What Size & Shape Sofa You’d Like. The cost of a sofa varies depending on its size and shape. In turn, the right size and shape depend on the size of your family and home. If you’re a small family looking for a two or three-seater under 90″ or 95″, you can generally get away with a budget or mid-range option. Manervia 3 Seater Vegan Leather Sofa. by Marlow Home Co. From £779.99 was £869.99. ( 5) 2-Day Delivery. FREE Delivery. Get it by Fri 01 Dec. Sale. +2 Colours. Ikea Karlstad 3 Seat Sofa Cover, Ikea Karlstad Replacement Cover, Ikea Karlstad Sofa Cover, Karlstad Sofa Slipcover, Karlstad Couch Cover. (1.1k) $205.31. $228.12 (10% off) FREE shipping. AMBER YELLOW heavier weight linen slipcover. Linen couch cover. Linen drop cloth couch cover. Large linen coverlet. How tall is a typical seat? Seats are typically required to be between 16 to 20 inches (40.6 cm – 50.8 cm) tall and at least 18 inches (45.7 cm) deep. If backs are present on the seats, they typically are at least 14 inches (35.5 cm) high. WG1ZA.