An intercom system costs anywhere from $150 to $15,000, depending on several factors including the type of system, audio, visual, or a combination of both. It also depends on how smart the system is. A basic audio intercom might cost $200 to $300 to buy and install. In contrast, a complete home automation system with video and a complete intercom setup might run $15,000 when you add the recreational, environmental, and security components.