I always planned on building my own house, but not until I have a LOT of money and time to spend. It will be my last house, the one I retire in.
I know a guy who went so far as to buy the land, something like 20 acres. He put a trailer on it and put in the septic system and a lot of fencing. It sat for a few years, and then he bought an already-built custom mansion in a nearby city. He has a full time job and didn’t really count on the time involved in building. So now he has a trailer on 20 acres that sits empty most of the time. That’s an awful lot of money for what basically amounts to a giant camp site.