Lifting too far and supporting only part of a structure are the two that actually happen. Both are decided when the scope is written, which is why the scope is worth reading more carefully than the price.

Why partial scopes are tempting in Phoenix

Against a median home value of $381,900, the temptation to scope only the visibly worst side of a house is real and understandable. But the median house here was built in 1984, and a survey reads the whole slab rather than the corner where the crack is. Scoping one side without a reason from that survey is the specific decision most likely to produce new cracking within a year.

The reasoning behind that

The first is over-lifting. A house that has been settled for fifteen years has had its plumbing, brickwork, drywall and door frames all take up the moved position. Recovering every inch of that movement asks all of them to move back at once, and some will not. Experienced firms recover most of it and stop, which is a judgment rather than a failure. The second is partial support. Supporting one side while the other keeps moving increases the difference between them, and difference is what cracks walls. A scope covering one elevation of a house needs a reason from the survey beyond cost. The third, less discussed, is plumbing. Lines cast into the slab move when the slab moves, which is why the pre-and-post test belongs in the scope rather than in the argument afterwards. None of these are reasons not to repair a foundation. They are reasons to read the scope and ask what was left out and why.

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