Standard Sofa. Average Dimensions: 70-84 inches long x 30-40 inches wide x 30-40 inches tall. Ideal for small-to-medium spaces, a standard sofa is easy to maneuver and works in a variety of setups, whether it is up against a wall, at an angle or floated in the middle of a room. Usually, a standard sofa will average about 86 inches in length and
The average 4-seat sofa will weigh in the region of 350 lbs. These sofas are designed to accommodate four people at once, so they tend to be quite large. The actual weight of your 4-seat sofa will vary depending on what the frame is made from and the type of cushions the seats and backrests are made from. 5 Seat Sectional Larger ones are around 72 in. (183 cm) long. Allow for a bench that is about 20 in. (51 cm) wide and 42 in. (107 cm) long as well. Based on these dimensions, it is wise to allow a clear floor space that’s at least 7 feet (213 cm) wide and 10 feet (305 cm) long to accommodate a grand piano.