Home Security System Costs Compared: What to Spend in 2026

Five years ago, home security meant one thing: a professionally installed, monitored alarm system from ADT or Vivint with a 3-year contract and $40–$60/month monitoring fees. Today, you can build a credible security system for $200 with no monthly fees, or spend $3,000+ on a professionally installed system with 24/7 monitoring, cellular backup, and environmental sensors.

The right answer depends on what you're actually protecting against, what your insurance company rewards, and whether you want self-monitoring or professional response.

The hidden cost in professional systems is the contract. ADT and Vivint typically require 36–60 month commitments with early termination fees of $500–$1,500. DIY systems operate month-to-month. Over a 10-year homeownership period, the total cost difference can exceed $5,000.