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A 6x8 deck covers 48 square feet and costs about $845 – $1,320 installed in pressure-treated pine, up to $1,843 – $2,880 in composite. It takes about 15 decking boards at 8 ft, 7 joists, 2 footings and 20 linear feet of railing.
| Material | Installed cost |
|---|---|
| Pressure-Treated Pine | $845 – $1,320 |
| Cedar | $1,229 – $1,920 |
| Redwood | $1,459 – $2,280 |
| Composite (Trex/TimberTech) | $1,843 – $2,880 |
| PVC / Cellular | $2,227 – $3,480 |
| Ipe / Tropical Hardwood | $2,496 – $3,900 |
A 6x8 deck is 48 square feet. In pressure-treated pine, expect roughly $845 – $1,320 installed. Cedar runs about $1,229 – $1,920 and composite about $1,843 – $2,880. 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 6 ft direction, you need 13 rows — that is 104 linear feet of decking, or about 15 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.