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Our house was built in the late 40's. Our basement gets wet if it rains a great deal, not really terrible, a shop vac takes care of it easily. But it is annoying and causes mold on the drywall. Our french drains are old ceramic type that are probably crumbled and not working properly, and I think that because of the age of the house, the foundation may have cracks.
I saw a few episodes of that Holmes Inspection show from Canada where they excavated the ground around the foundation, down to the bottom, repaired all the cracks, replaced weeping tiles, and rubber sprayed the foundation as to solve the type of problem I believe I have.
Problem is they never talked about the cost of such a thing. We get the leaks from two sides of the basement, so I'm thinking the excavation work would be around 3/4 of the house.
Nobody's going to be able to tell you what yours is going to cost without looking at it and probably doing a little exploratory digging.
I had to have the drain on one side of my house replaced, IIRC it was about $2500, but included putting a new surface drain in the driveway too. This was a drain just under some gravel so it would probably be cheaper than one which was deeper.