Deck Cost Calculator

Estimate the total cost of building a deck including materials, railing, stairs, and labor based on size and material type.

This calculator estimates total deck cost by combining a per-square-foot material rate, a per-linear-foot railing rate, a flat stair-set charge, and a labor estimate set at 1.5 times the material cost. Deck Material has by far the largest effect on Total Estimated Cost of any input on this calculator -- because it sets the per-square-foot rate ($15 for pressure treated up to $40 for PVC) that both the material cost AND the labor estimate are built from, switching from pressure treated to PVC at these default dimensions moves total cost by well over 100%, far more than resizing the deck itself. Deck Length and Deck Width both increase Total Estimated Cost -- deck area feeds directly into material cost, and perimeter (which drives railing cost) grows with both dimensions too, though length has a somewhat larger effect than width at this calculator's default (rectangular, longer-than-wide) proportions. Railing Type and Stair Sets add their own cost on top, but neither swings the total anywhere near as much as the material choice does. This is a rough per-unit cost estimate using national averages -- actual material prices, local labor rates, permit fees, and site conditions (grade, ledger attachment, footings) can all shift real costs substantially.