10 × 12 deck cost & materials
Short answer
A 10 × 12 ft deck is 120 square feet. In composite it costs about $3,600–$7,200 installed and needs roughly 18 deck boards and 10 joists.
Area
120 sq ft
Composite cost
$3,600–$7,200
Deck boards
18
Joists
10
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Frequently asked questions
How many deck boards for a 10 × 12 deck?
About 18 16-ft boards (5½" wide) for 120 sq ft, including 10% waste. Longer boards mean fewer pieces but more offcuts.
How much does a 10 × 12 deck cost?
A composite 10 × 12 deck costs about $3,600–$7,200 installed. Pressure-treated wood is cheaper; PVC costs more.
How many joists for a 10 × 12 deck?
About 10 joists at 16" on center, plus 6 footings. Enter your exact size and spacing in the calculator.