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How to purchase builder's risk insurance
Find an insurance company to buy builder's risk insurance from.
If you already have home insurance, the company that holds that policy is a good place to start. If you do not have homeowner's insurance, you can inquire with the company that you have renter's insurance or even automobile insurance with.
Ask your agent if they offer builder's risk insurance and if he can give you a reduced rate since you already have your other policies with them. You can also shop around and get price quotes from other insurance companies.