Did you go to the courthouse yet and look at the documentation on the house? If it's in a subdivision or relatively modern (80s) most municipalities have quite a bit of documentation on the house... all the way back to a site plan. City of Waukesha is really good at maintaining documentation. In fact, if it was built in the 80s in Waukesha they actually have energy audit information.
The permits will be on file also and then you can look to see who/what/when did the work.
The courthouse is your best friend, better than a home inspector and any hack contractor that is moonlighting as a sidejob.
Further, you need to do some research of your own. I've found that most people in the wannabe inspection business (included "perfeshinall" tradespeople) is that if they aren't at least 60 years old they don't know shit. If they just do "new construction" then they're pretty much worthless for inspection purposes. It's amazing how many 35 year old HVAC people there are that don't know what vermiculite is.