The cost to monitor a security system varies based on several factors, including the type of system, the range of services offered, and whether it’s professionally monitored or self-monitored. On average, professional monitoring services charge between $15 to $50 per month. Some premium services might cost more, especially if they include added features like home automation or video surveillance. On the other hand, self-monitoring through DIY home security systems is often more cost-effective, with many systems offering free mobile alerts or charging minimal monthly monitoring fees. It’s essential to compare different home security providers and their packages to ensure you’re getting the best value for your investment.