how much does it cost to build a new deck
1 This is the price for a single-level 16Ã20 foot platform deck with 4 concrete anchors, 3 steps of stairs and railings on three sides.  According to the costs reported by Improve.net members, the national average price for a deck is $6,148, with $14,000 being the top of the budget. To build a deck in Maryland, however, the site users reported to have spent close to $10,000 on average and $25,000 maximum.