OP, you can get the pans for the house you are looking at from Sumter County building department. With this you can call 2 or 3 contractors to get magnitude estimates. I stress magnitude estimates because T&D (probably the leader in this area) will have a 2 month lead-time for a detailed estimate, and probably 2-3 months before start of construction. You could ask on this site for names of construction firms that have successfully done this type of work. Having the house plans will let the contractor provide a realistic magnitude estimate for the work.
As well as the foundation work, irrigation lines must be relocated, the outside wall is most likely load bearing, so there will be consideration as too how much wall can be removed, and header requirements. The design of the roof in the area may have a significant impact on overall cost. My point being that someone may have been able to do this for $20,000 (ideal conditions) while another had a cost of $40,000 (less than ideal conditions), IMHO there are way too many variables to get a good number here.
If you really like the house, then figure $40,000 for the modifications, if the house still makes sense, buy it and then make the changes, if it does not, you might want to look at other houses with larger garage and or golf cart garage included.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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