I was also thinking if I have to dig up the outside to install drains why not just demo the floor and dig down about another four feet to get proper head height as well?
I know this won't be a DIY project but I got the house for 49,900 and its value as it sits now is 70,000 .
Like I said the house had been added on to some time in the 70's and the new addition is on a crawl space I'm thinking of hiring a house mover to come out and not lift but just sure up the add on so I can dig out the crawl space and have a full basement .
The home is 1,900 sq feet now and if I add that crawl space as a basement it would put it it well over 2,200 .
The other pro I'm thinking of the only pipe under the crawl space is the main water line coming from the street the gas line is in the basement and above the crawl space is just two bedrooms and a living room .
I really think this could be done with professional help and done right .