How many deck boards do I need for a 10×10 deck?

Deck boards for a 10×10 deck by board length

For 5/4 × 6 boards (5.5 in wide) with 1/4 in gaps laid across the 10 ft dimension: 21 rows and 384 linear feet before waste. Pick the length that divides your deck with the least cutoff.

Lumber list for a 10×10 deck

• Decking: 24 boards of 5/4 × 6 × 16 ft, which is 384 linear feet plus waste.
• Joists: 9 pieces of 2 × 8 (spans to 12 ft) or 2 × 10 (spans to 15 ft), each 10 ft long, at 16 in on center. Composite decking usually requires 12 in spacing; check the brand.
• Rim joists and beam: two rim joists of 10 ft, plus a doubled 2 × 10 beam of 10 ft on 6 posts of 4 × 4 or 6 × 6 at 8 ft spacing, each on a concrete footing. The concrete calculator sizes the footings.
• Ledger: a 10 ft 2 × 10 lagged to the house every 16 in, with flashing, if the deck attaches to the house.
• Hardware: 18 joist hangers, 397 lb of 2-1/2 in deck screws, and a box of structural screws or 1/2 in lags for the ledger and beam.
• Stairs: figure them separately with the stair calculator.

What a 10×10 deck costs

Pressure-treated 5/4 × 6 decking runs about $1.50 to $2.50 per linear foot, so the boards alone are $576 to $960. Framing lumber, hardware, and footings add roughly $600 to $1,000, putting the whole deck at $1,200 to $2,000 in materials, or $12 to $20 per square foot. Composite decking at $4 to $7 per linear foot raises the board cost to $1,536 to $2,688. A contractor-built pressure-treated deck of this size typically prices at $3,000 to $5,000; composite runs $4,500 to $8,000.