Growing up, upto 1/4" was ok. Now I see 1/2" to 3/4" and more off all the time on walls, window and door openings, etc. I've had many arguments with shitty contractors about this.
I've looked for some sort of standard on this for a long time with no luck. I've also talked with some of the Arch.'s I've worked with without any success.
It seems to be one of those items that didn't get written 'because everyone knows it is supposed to be level and plumb'.
The developers always use the argument that all the finish components that follow will be installed level/plumb (yeah right) so it doesn't matter.
OHD garage headers out of level? When do I see one that is level? I used to do a lot of garage insp. Carpenter A measures studs for one side of header and just cuts the other side at the same time. Forget about checking the concrete level. That's what the flashing is for to hide mistakes.

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Accurate Inspections & Consulting, Inc.
773/844-4AIC
Markus Keller