It happened on this job. The page records moisture problems found during demolition that had to be remediated, and old plumbing and electrical that needed full upgrading once it was exposed.
What this page does not print is what that added to the cost or the schedule. So ask the question the other way round before you sign: how are unforeseen conditions priced, and who has to approve the extra work in writing before it goes ahead.
Not on this one. This job was built to a move-in date, so the house was handed over ready to occupy rather than lived in while the trades ran through it. The page also notes limited access for material handling because the street around it was occupied.
If you need to stay in your home while the work runs, say so before the quote rather than after. It changes how the trades are sequenced, and a kitchen or a bathroom being out of use for part of the job is the part worth pinning down early.
On this house it did. The page records that the old plumbing and electrical needed full upgrading to meet current code, that the house was completely rewired with a new breaker panel, and that the finishing was code compliant with final inspections.
What that means for your house depends on what is behind your walls now. Ask for the electrical scope to be written down separately, and ask which inspections your job needs.