I have a 26 (front) x 41 (depth) foot house,about 100 years old, in upstate NY. It appears to have been built in three different sections. The front third has a field stone crawl space with uneven dirt "floor". You can see light through the foundation in some spots. This is connected to the middle third of the house which has about 6 foot walls make of field stone. There is evidence of termites living within the field stone layers. The floor is still dirt. There is a 4 foot cylindrical dug hole in this floor with a slate "collar." It is dry and I have filled it in with stone. The back third of the house, under the kitchen, has absolutely no access. It is completly shut off from the basement. Outside there is a little concrete that looks like it was troweled on as an afterthought. The belief is that the floor joists are just on the dirt which is probably why the house is infested with termites. Can this foundation be improved somehow other than jacking the house up and pouring a complete new basement??? Of course, cost is a factor. Thanks!

It's something that would definitely have to be seen before any comment can be made. Almost anything is possible, until budget becomes a consideration, but you have three different structures on three different foundations...it cries out for an on-site evaluation by a competent architect or structural engineer.