2018 Porch and Deck Prices How Much Does A Deck Cost?
Decks & Porches Costs. . According to our decking installation cost estimator, the average price to build a deck is $6,148. Keep in mind, this price includes professional installation. . Composite decking is waterproof and will not crack, warp or separate. It costs $1,715 to $1,975 to build an average-sized synthetic wood deck.