Selling a home without building permits

Lets just say some guy I know did a little work to his house in the form of rewiring existing outlets and lights as well as redoing the sheetrock in the garage and putting a subpanel out there with new wiring to the outlets and lights.

Lets say this guy I know wants to sell the house in a few years. When he goes to sell it, are they going to know what work has been done or if a subpanel was out in the garage before he bought the house in the first place? I'm just wondering if they are able to see the existing home inspection and realize that this work has been done.

This guy is a first time home owner so he is just curious how it works :mrgreen: