How do home security systems work?

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Reviewed by Security Help Guide Editorial Team · Last updated August 2026

Related: Best Systems: Types & Options · what home security costs · camera cost calculator.

• Professional monitoring averages (about $20-$60 per month, near $30 average): Security.org and SafeWise cost guides, 2025 (security.org, safewise.com).
• Security camera installation labor (about $80-$200 per camera; DIY saves roughly $150 per camera): HomeAdvisor and Angi installation cost guides, 2025 (homeadvisor.com, angi.com).
• Deterrence findings (about 83% of burglars check for an alarm; roughly 60% would pick another target; about 40% deterred by visible cameras): Kuhns, Blevins & Lee, “Understanding Decisions to Burglarize from the Offender’s Perspective,” University of North Carolina at Charlotte, 2012.
• Installer licensing requirements are set by each state (an alarm, security, or low-voltage board, the state police, or local rules) and by local alarm-permit ordinances; always verify the rule where you live.
• Cost and timeframe figures are typical U.S. ranges for education only and vary by home, equipment, region, and company. They are not an offer, quote, or guarantee.