Photos: Hillary Clinton's life in the spotlight. Clinton waves to the media in January 1996 as she arrives for an appearance before a grand jury in Washington. The first lady was subpoenaed to testify as a witness in the investigation of the Whitewater land deal in Arkansas.
1 Adding a basement to an existing house can cost $30,000-$70,000 or more, depending on the size of the existing crawlspace or half-basement or if the house is on a slab foundation, and how much of the work is do-it-yourself and how much is done by contractors.
The cost for materials and labor is around $10.00 - $15 per square foot. This may also include excavation. Other items to be considered for basement foundation include basement cavity, site drainage, window well placement, in-slab ductwork and piping, sidewalks, walls and so on.he cost of constructing simple slab foundation is around $6.00 to $10.00 per square foot including the materials and labor. For complicated slab, the cost is around $15 to $20 per square foot.