Today, two guys came to look under the house. Needless to say, they gave wildly different reports.
The first guy works for an outfit that installs fancy steel jack “spikes” 30 ft. into the ground, like one would see used for new Happy Valley houses built on the side of cliffs, -whatever-, and he looked horrified that this house had such a small crawlspace, as opposed to a new suburban-style foundation.
The other guy was moderate in his comments; in fact, he didn’t see much to do to the crawlspace (despite it being accessible to rodents, a few posts needing extra support, etc.); he indicated that the patio area was the problem, since rainwater pools near the back wall of the house.