sweating water pipes

My wife and I recently offered a contract on a wonderful house -- a house to which the current owner has made extensive additions. All was proceeding well until the home inpsector told us that there was inadequate (really, almost no) crawlspace underneath one of the added rooms. In addition, there is no concrete slab under this room. We have been told that the lack of either a concrete slab or sufficient crawlspace will prevent us from reselling the house on a VHA or FHA mortgage and that these problems may also prevent us from receiving a termite bond. We are also concerned about the potential for mold growth. One solution would be to take up the present floor and pour a concrete slab. Another solution would be to have a crawlspace dug. I hope someone out there may have some helpful thoughts on this matter. I appreciate your advice very much. Except for this one problem, we love the house and its price. Thanks!

We are looking into moving a house onto a site where there was a house before that burned. The old basement is still there, and we were thinking of using it - with putting new walls within the old basement and just making it a little smaller. We don't have much money to spend and am wondering if this would work and what would be best block or poured cement. :confused: