Glue down is more for us. The glue often costs .75/ft. If the subfloor is concrete, sealer (2 coats) adds another .50/ft. Then you add $3/ft. minimum for the install itself. Nail downs start at $3/ft. Wood floors are all we do and we are very conscious of doing our jobs to the best of our ability.
1 Home addition cost estimates of $80 to $130 per square foot for a basic family room addition is common. 2  If the home addition includes a bathroom and/or a kitchen, the room addition costs can easily escalate to $200-250 per square foot.
Building out to add a bedroom allows you maximum flexibility. Adding a 14-by-16-foot master suite, including bathroom, over a crawlspace costs an average of $103,844 as of 2014, according to Remodeling. This type of project also offers a nearly 75 percent return on investment.