I have a sun room that was added to my 31 year old house about 25 years ago and is made up mostly of windows. It sits on a poured concrete slab, no crawl space. The main house is on a slab, no basement or crawl space. The slab on the sun room runs with the grade such that towards the end, the foundation wall is exposed at a height of about 15". There is a 4 ft. crack that starts thin and gets bigger going away from the sun room, no more than 1/16" at its widest. I have had 2 contractors come out so far that say it is due to settling and suggest major repairs, one excavating and putting in a new footing, the other using a push pier. Now, I'm just a woman so what do I know but here is what I think. What is actually cracked and buckling is the parge attached to the cinder block. There is absolutely no evidence of settling inside or outside the room. When I take my level to measure at certain places near the crack, on the floor inside, siding above parge, window top and bottom, that little bubble sits right in the middle. Are these contractors messing with me with their 4 figure fixes? Do I just need to have some reparging done? Should I pay $300 to $400 for a structural engineer? Any help would be appreciate. Thanks.