Hallow I am civil engineer, how can I start house insurance company?

It would help to know where you live in order to answer your question better. If you live in the U.S. you would need to take classes in an approved school to become a licensed insurance agent. You then would need to take tests. But, it really would be helpful to answer your question better if you would say the country where you live, or in the U.S. at least the state.

It would also help if you would specify more about the type of house insurance that you are wanting to sell.