basement conversion cost per square foot
$73 cost per square foot: Tatiana Xenelis-Mendoza served as the designer and general contracted for her 750-square-foot basement conversion completed this month in her house in the Portsmouth neighborhood. She spent $55,000 on the project including $25,000 worth of her own time.lso, the entry is at the end of the narrow driveway, which means they have to move cars so guests can enter. $64 cost per square foot: Das Chapin and Amanda Punton built a 780-square-foot basement conversion on their Southeast Buckman neighborhood property.