Converting single family into 2 unit

Hi, if I were to convert a current owner occupied single family into a 2 unit rental (both sides rented), would I need to notify the homeowners insurance company and mortgage company?

Would I need to change the insurance policy from the single family to a 2 unit, and would they notify the mortgage company and would the mortgage company need to refinance me? Or would I just need to notify the insurance company that I'm renting it out 100%?