cost of redwood deck
What should be included: 1  A redwood deck can cost $30-$75 or more a square foot ($9,600-$24,000 for a 16'x20' deck), depending on the quality of the lumber, project complexity, and whether construction is by casual labor or a licensed contractor. Because redwood is so expensive ($15-$25 and more a square foot for deck materials), building a redwood deck is no longer a common do-it-yourself project.