Do you need to get an umbrella policy from the same insurance company that covers your car and home insurance?

Yes. Most companies that offer umbrella or excess liability policies will not offer such a policy unless they also insure your home and or vehicles. The reason for this is that under the policy you are required to carry policies on your home and vehicles but are required to carry certain limits of liability on these policies. It s much easier for the company to monitor these policies and required limits if they handle these policies. There are some companies that will write these separately but the prices are much higher under these circumstances.