When assessing an engineering foundation performance evaluation you would be wise to ask the following questions:
Does the report state that there were any structural integrity issues found?
If there are no structural integrity issues, does the engineering report describe any other options other than underpinning?
Does the report strike you as being fair to all parties to the transaction?
Are the engineer’s recommendations practical?
Here is a close paraphrase from an engineering report:
The expected degree of levelness should be discussed with the repair contractor. In my experience, foundation repair contractors do not address the degree of levelness to be expected.
Did you get that? Foundation repair contractors do not address the degree of levelness to be expected. Why would any Professional Engineer
Are the recommended repairs cost-effective?
Underpinning a slab foundation is rarely cost-effective.