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A 10x10 deck covers 100 square feet and costs about $1,760 – $2,750 installed in pressure-treated pine, up to $3,840 – $6,000 in composite. It takes about 24 decking boards at 10 ft, 8 joists, 3 footings and 30 linear feet of railing.
| Material | Installed cost |
|---|---|
| Pressure-Treated Pine | $1,760 – $2,750 |
| Cedar | $2,560 – $4,000 |
| Redwood | $3,040 – $4,750 |
| Composite (Trex/TimberTech) | $3,840 – $6,000 |
| PVC / Cellular | $4,640 – $7,250 |
| Ipe / Tropical Hardwood | $5,200 – $8,125 |
A 10x10 deck is 100 square feet. In pressure-treated pine, expect roughly $1,760 – $2,750 installed. Cedar runs about $2,560 – $4,000 and composite about $3,840 – $6,000. Building it yourself typically removes 40 to 55 percent of those figures, because labour is around half of a finished deck price.
Laying boards across the 10 ft direction, you need 22 rows — that is 220 linear feet of decking, or about 24 boards at 10 ft with a waste allowance. A 10 ft board crosses the deck in one piece, so there are no butt joints.
About 3, one under each post, with posts at no more than 8 feet along the beam. That is roughly 0.37 cubic yards of concrete for 12 inch tubes poured 42 inches below grade — around 17 eighty-pound bags. Your own frost depth sets the real number and is not negotiable.