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.
Find out how you can get this project done for only per month (est.*). The average national cost of building a foundation is $7,850, with most homeowners spending between $4,159 and $11,891. This data is based on actual project costs as reported by HomeAdvisor members. Any structure, whether a house, a garage, or workshop, is only as strong as its foundation.