Mobile Home - Home insurance and Permits

[Pandu Chimata]

Hello folks, I am in the process of purchasing a mobile home (never done before) in the Palm Springs area. 

1. I am looking to see which companies offer insurance for Mobile homes. I asked my agent (who insures my primary residence) and they don't do insurance for mobile homes.

2. Also, what kind of rules/code will be applied if you change the structure inside of a mobile home such as adding a new room or changing the layout, etc.? Do mobile homes come under city permit/code? 

Any help in this regard is appreciated.