Question about DBA
That is a strange case. I never heard about fire inspections for computer repair and website building businesses.
I presume the county wants to check if your parent's home is safe, meaning you will not set it on fire while building someone's website. That's one hell of a nanny county. Unfortunately, listing your friend's address as the business address means you will technically have to have your business located there. I do understand your dad though - it is better not to give the government agent another reason to knock on your door.