I recently had a conversation in the polru about the cost of housing in the United States and I said that it is much cheaper to build than to buy a ready-made one.
The answer was that you can only build and design with a license.
Now I started a big project with the development of a village in California.
Just had to dig into all the permits.
You can build and design up to two floors of wood without a license. At least in this case.