Expensive to build this home?

[Hotzcatz]

If you are doing the work yourself, then it is the cost of the materials plus the septic, grading (unless you are doing that yourself), plumbing and electrical work. Do a rough estimate for the materials and required subcontractors and add a bit for stuff you forgot to put in and that's pretty much your ballpark figure.

You can get a permit for single wall construction, it is entirely legal. I had a set of plans go through the Building Department last year for a small (under 500 square feet) house in single wall without any corrections at all. The owner hired a couple carpenters to help and her house is done now.