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.
Are you doing the work or is someone else. It can cost between $100.00 to $250.00 per square foot. The addition of the new bedroom and bathroom, it will not only provide the space that you need, but will add value to your home. You can expect a 75% to 90% or appreciation to the addition with permits.