The house is in West Los Angeles, CA, one story built with a crawl space (in early 50s). A master wall runs from the front to the back of the house, and the house is sinking on both sides of that wall; one side, the shorter, more than the other. The door frames are crooked and some doors are hard or impossible to close. I'm not sure how fast it is sinking now, but it is sinking.
A (general construction) contractor came and checked it, but never got back to me, i think he didn't want to get involved. I know of a couple of "similar" cases where the house was lifted with hydraulic jacks and new posts were placed to reinforce the foundation, but some people has cautioned us that doing so may cause problems to other parts of the house (walls, roof, etc.).
Any suggestions? Thanks