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Installation of a basic car alarm typically costs another $50-$200 or more, depending on the complexity of the system and the ease of access inside the vehicle's dash, bringing the total cost to $80-$500.
Note, however, that ADT promotional packages for new customers are frequently offered, and the costs shown are only an estimation based on what customers in the past have paid. 1  A basic ADT alarm system might cost around $100-$350 to install if you agree to a 36-month monitoring plan that about $35 per month.DT Home Alarm System Prices. ADT, founded more than 130 years ago, is North Americaâs large provider of electronic security services.