A 20 yard dumpster holds 20 cubic yards of waste and sits 14 feet long x 8 feet wide x 5 feet tall. Some examples of projects for a 20 yard dumpster include: Clean out of a large basement, attic, and garage. Total tear out of flooring and carpet for a large house. Removal of a 400-500 square foot deck. Shrub, brush, & tree removal. Bathroom or large kitchen renovation.