Let’s get a topic going about phrases that are used when someone is trying to make you exceed the specifications, do extra work for free, or are useful to deflect some criticism, etc. Some examples of what I’m talking about are:

This is a trade standard.
We had to remobilize……
It was installed in a neat and workmanlike manner
The customer cannot be unduly enriched (meaning they cannot get something for free)
There are now differing site conditions