I had a co-worker who built a house in the same sort of way while living with his father nearby. I did ask about inspections and he said that out in rural Texas, they just don't do that, and they also pay very little in property tax.
Generally speaking you want at least one window per room as a means of escape in the event of a fire in case the door is blocked, but the natural light might also be important to people.
It’s still the case that in much of the country (rural) the inspections are more concerned with “will your house kill the electrical/water/sewer/neighbor” than with your safety-its assumed you know what you’re doing.
Even in the big cities inspections are often cursory if it seems obvious to the inspector that the people involved know what they’re doing.
And this is why you should hire a good home inspection service that knows how to inspect construction and when; they will be more thorough.
Generally speaking you want at least one window per room as a means of escape in the event of a fire in case the door is blocked, but the natural light might also be important to people.