As with any security system quote, the price of a church security system is going to depend on a number of factors. Is there usable equipment already installed? What type of features are you looking for? A simple intrusion detection system will usually cost less than a full security system with multiple cameras and access control. Adding new equipment like panels and security cameras as well as door readers can put installation costs into the multiple thousands when it comes to a dollar amount. As far as monthly costs, a church security system with cameras will be upwards of $45 a month to account for multiple devices and the amount of video storage you might need. Additional access control doors can increase monthly costs as well.