Doing it yourself, you can build an 8x10-foot ground-level deck from treated lumber for about $500 in materials. Having a contractor build it for you raises the price to $1,500. You could build a treated-lumber raised deck, say 10x16 feet, for about $1,500 in materials.
Then, what size decking screws should I use?
Most decking screws are 8-gauge and, while 2 1/2 inches is the minimum length needed to hold decking boards to the joists, 3-inch screws are commonly used to provide extra holding power against the upward pressure of shrinking or warping boards. Specialty decking materials have different requirements.
How much does it cost to build a 20x20 deck?
Cedar, redwood or wood composites are more expensive, ranging from $35 to $60 per square foot installed. At those prices: A 16x20 foot deck made with pressure-treated wood would cost $9,600 to $11,200. A 20x20 deck using the same material would cost $12,000 to $14,000.
How much does it cost to build a 12x12 deck?
The average homeowner spends about $7,000 to build a 200 to 500 square foot deck, with smaller decks costing as low as $2,000. The cost to build a deck in wood, composite or plastic is about $35 per square foot, including materials.