Raised Deck Cost At $45 to $50 per square foot, a small 10 x 12-foot second-story deck made from pressure-treated lumber costs $5,400 to $6,000. Increase the size to 16 x 20 feet, and the price soars to between $14,400 and $16,000.Click to see full answer. Just so, how much does it cost to build a 20×20 deck?The average homeowner spends $2,200 to build a 10×10 foot deck, $6,160 to build a 14×20 deck, and $8,800 to build a 20×20 deck. The cost to build a deck with pressure-treated wood, hardwood, or composite is about $25 per square foot, for both materials and installation.Additionally, how much does it cost to build a deck with stairs? Adding simple footings beneath the concrete pillars averages $1-$2 per square foot. Adding railings or stairs to a deck will also increase its cost. The average cost to install steps and railing 6 is $30-$35 per square foot. A long flight of steps will cost more to install and averages $48-$55 per square foot. Furthermore, how much would it cost to build a balcony? Building a balcony runs $15 to $35 per square foot.Does a deck add value to a home?value of home improvement projects. In the NAR/NALP study, a new wood deck will recover 106 percent of its value when the house is sold. Estimated construction cost estimated was $9,450, and the estimated value that a new deck adds to the house value at the sale was $10,000.
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