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.
Ask the Builder estimates that room additions cost $115 to $200 per square foot as of 2014, putting the cost of a basic 10-by-10-foot bedroom between $11,500 and $20,000.onverting an unfinished attic to a 15-by-15-foot bedroom with small bath costs an average of $49,438, with a nearly 85 percent return on investment, according to a 2014 report by Remodeling. The cost of this bedroom conversion can be as much as 30 percent higher in high cost-of-living areas.