2018 Cost to Build A Deck | Deck Prices | Deck Materials - ImproveNet26 Jun 2017 ... Building A deck cost Factors. There are plenty of reasons why certain decks are much cheaper than others. Those factors include: Materials; Design; Railings; Built-in Features; Removal of Old deck; Permits & Insurance; Hiring A Pro; Longevity. cost of Materials. The material you choose for your deck will play a major role in your deck installation cost. As you can see on our decks and porches cost estimator, prices go from as little as $1/sf to as high as $41/sf.