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.
1 A modular home (built in a factory then trucked to the building site in sections) starts at $50,000-$60,000 for 800-900 square feet (1-2 bedrooms, 1 bath) not including the cost of the land, foundation or other site work, but can cost $500,000-$1 million for large, customized homes. A bedroom addition consisting of 500 square feet of new floor space with two bedrooms and a bathroom can cost $50-$250 or more a square foot, or $25,000-$125,000.