As an Amazon Associate I earn from qualifying purchases.
A 8x8 deck covers 64 square feet and costs about $1,126 – $1,760 installed in pressure-treated pine, up to $2,458 – $3,840 in composite. It takes about 20 decking boards at 8 ft, 7 joists, 2 footings and 24 linear feet of railing.
| Material | Installed cost |
|---|---|
| Pressure-Treated Pine | $1,126 – $1,760 |
| Cedar | $1,638 – $2,560 |
| Redwood | $1,946 – $3,040 |
| Composite (Trex/TimberTech) | $2,458 – $3,840 |
| PVC / Cellular | $2,970 – $4,640 |
| Ipe / Tropical Hardwood | $3,328 – $5,200 |
A 8x8 deck is 64 square feet. In pressure-treated pine, expect roughly $1,126 – $1,760 installed. Cedar runs about $1,638 – $2,560 and composite about $2,458 – $3,840. 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 8 ft direction, you need 18 rows — that is 144 linear feet of decking, or about 20 boards at 8 ft with a waste allowance. A 8 ft board crosses the deck in one piece, so there are no butt joints.
About 2, one under each post, with posts at no more than 8 feet along the beam. That is roughly 0.25 cubic yards of concrete for 12 inch tubes poured 42 inches below grade — around 12 eighty-pound bags. Your own frost depth sets the real number and is not negotiable.