cob in montana

So im moving to Montana in just a few short weeks an i need to know if cob is a viable building material as far as codes go. Are building codes severely followed or are they more lax like in Hawaii you can live in a non permitted home slash shelter for possibly ever with out a a county worker coming to inspect an subsequently fining you or having said structure demolished. These are questions I would dearly like answered by the well informed. Thank you very much