Average Cost to Build a Deck by Size

Deck Size	Square Footage	National Average Cost Range
14' x 20'	280 sq ft	$11,200 – $16,800
12' x 24'	288 sq ft	$11,520 – $17,280
16' x 20'	320 sq ft	$12,800 – $19,200
20' x 20'	400 sq ft	$16,000 – $24,000

Cost of Deck Installation: How Much Does It Actually Cost?

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