Deck Deck Cost Calculator 01Deck Dimensions & Shape 12×12 12×16 16×20 20×20 20×24 Length (ft) Width (ft) = 320 sq ft Rectangular ×1.00 Baseline framing L-Shaped ×1.15 Extra framing & angled cuts Wraparound ×1.25 More perimeter & framing Multi-Level ×1.30 Extra structure & transitions 02Decking Material Pressure-Treated $25–$40/sq ft Budget-friendly · DIY-friendly · needs periodic sealing Cedar $32–$50/sq ft Natural rot resistance · takes stain well Composite $40–$60/sq ft Low-maintenance · 25–30 yr warranty typical PVC / Premium $55–$80/sq ft Fully weatherproof · longest warranties Tropical Hardwood $55–$85/sq ft Premium density · exceptional lifespan 03Height Above Grade & Stairs Ground-Level (12″) Raised (24″) Elevated (60″) inches Elevation tier— Auto-computed stairs— 04Railing Include railing Wood / Pine — $30–$45/lf Composite — $45–$60/lf Aluminum — $55–$80/lf Cable — $80–$100/lf Glass Panel — $110–$150/lf Estimated railing length— Perimeter estimate excluding the side attached to your house 05Add-ons Built-in bench seating +$800–$1,800 Pergola / shade structure +$3,000–$9,000 Outdoor lighting package +$500–$1,800 Built-in planters +$400–$1,200 Picture-frame border pattern +8–12% of base Remove existing deck +$3–$6/sq ft 06Location National Average Northeast — NY, NJ, MA, CT, PA West Coast — CA, WA, OR Mid-Atlantic — MD, VA, DC, DE Midwest — IL, OH, MI, MN, WI, IN South — TX, FL, GA, NC, SC, TN Mountain West — CO, AZ, UT, NV, ID