Since both of the damaged vehicles were a result of the same incident then it's likely that your insurance company will only consider the entire claim one accident. Our State of Insurance report
shows that at-fault accidents have an average impact of $899 per year in additional premium in California
. Given that figure is an average it's not a true picture of what will happen to your policy, but it should provide an estimate for what to expect. You would need to contact your insurance provider for the specific impact to your rate.