cost for a deck per square foot
1 A PT wood deck can cost $8-$50 a square foot ($2,560-$16,000 for a 16'x20' deck), but averages about $25-$35 a square foot ($8,000-$11,200 for 16'x20'), depending on the quality of materials, project complexity, and whether construction is by casual labor or a licensed contractor.ow much does cost? Typical costs: 1  A PT wood deck can cost $8-$50 a square foot ($2,560-$16,000 for a 16'x20' deck), but averages about $25-$35 a square foot ($8,000-$11,200 for 16'x20'), depending on the quality of materials, project complexity, and whether construction is by casual labor or a licensed contractor.