Home inspectors will check for permits for common stuff like hot tub spa, pool, enclosed lanai, birdcage, or an added building, wall or extension. Where you have to do your own research is basically the landscaping and driveway/walkways.
As many have said, it's pretty simple, if the home you are looking at has any feature that looks unusual and different than the neighbors then you need to look into it.
As far as home and roof color, again if it looks way different than the neighborhood you need to check. Generally, reputable roofers and painters will make sure an approved color is used.
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