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A 4x8 deck covers 32 square feet and costs about $563 – $880 installed in pressure-treated pine, up to $1,229 – $1,920 in composite. It takes about 10 decking boards at 8 ft, 7 joists, 2 footings and 16 linear feet of railing.
| Material | Installed cost |
|---|---|
| Pressure-Treated Pine | $563 – $880 |
| Cedar | $819 – $1,280 |
| Redwood | $973 – $1,520 |
| Composite (Trex/TimberTech) | $1,229 – $1,920 |
| PVC / Cellular | $1,485 – $2,320 |
| Ipe / Tropical Hardwood | $1,664 – $2,600 |
A 4x8 deck is 32 square feet. In pressure-treated pine, expect roughly $563 – $880 installed. Cedar runs about $819 – $1,280 and composite about $1,229 – $1,920. 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 4 ft direction, you need 9 rows — that is 72 linear feet of decking, or about 10 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.