No idea how it would work, but not a bad idea to use one.
One would think new construction would be built and inspected to all of the latest codes. Maybe I'm just being naive. Then again, it's impossible to see everything during a quick inspection visit.
My neighbor told me how various construction sites he inspected, they would try to bribe him or suggest a bribe if he would just let a bunch of stuff slide.
A lot of people (my brother-in-law included) look at building inspectors as the enemy. They'll argue and go to great lengths to hide or distract inspectors from items that aren't up to code. Or they think they just know more than the inspector does (I did know more than some of our inspectors, but I still appreciated the second set of eyes to catch my mistakes).
Personally, when we built our house I enjoyed each inspector visit. They were all quite friendly and offered helpful advice with each visit. The guy that came out most often frequently suggested improvements that weren't really code issues, but I appreciated and used many of his ideas anyway. He really seemed to enjoy watching our progress.
Our electrical inspector cringed when he first showed up after I told him I did all the wiring myself. By the time he left he kept commenting I should teach the professionals how to do it right.
Apparently the "pros" cut lots of corners.
Our funniest inspector was a new gal that had just started and came out to inspect our new garage. She showed up on our muddy construction site in high heel dress shoes. She stood about 30 feet from the garage on our gravel driveway and said, "yep, looks good".
Our final inspector was just the opposite. She took her job seriously, even climbing under the house and crawling around to check the insulation and plumbing. She definitely earned her pay that day, I was impressed.