A 20 yard dumpster holds 20 cubic yards of waste. This is roughly equivalent of seven pickup truck loads of debris. Common dumpster dimensions for a 20 yard dumpster are: 22 feet long by 8 feet wide by 4 ½ feet high (dumpster dimensions can vary, but total volume is accurate). This size is ideal for a house cleanout, large home remodeling and additions or stripping a single layer of roofing shingles. This is one of the most popular dumpster sizes because of its price and capacity.