Rough cost range for a new deck, DIY or professionally installed.
How this worksDeck size is length × width in square feet. We multiply by typical per-square-foot ranges: DIY basic $8–15 (just materials for pressure-treated lumber), DIY premium $15–25 (composite or cedar materials), and pro install $30–60 (materials plus labor, roughly half and half). Real costs vary by local lumber prices, footings, railings, and permits — treat this as a ballpark.