NAICS UNIVERSITY · Free research for insurance agents
Security Systems Services (except Locksmiths)
NAICS 561621 · United States · 2022 edition
This U.S. industry comprises establishments primarily engaged in (1) selling security alarm systems, such as burglar and fire alarms, along with installation, repair, or monitoring services or (2) remote monitoring of electronic security alarm systems.
Activities described by this code
Other activities to examine
- Selling security alarm systems for buildings, without installation, repair, or monitoring services: 42 — Wholesale Trade, or Sector 44-45, Retail Trade
- Installing alarm systems (e.g., fire, burglar), without selling or monitoring services: 238210 — Electrical Contractors and Other Wiring Installation Contractors;
- Retailing motor vehicle security systems, with or without installation or repair services: 441330 — Automotive Parts and Accessories Retailers
Census classification reference
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Compare another operationInsurance operations research — draft
Security systems services businesses typically sell, install, service, and/or remotely monitor electronic alarm systems — including burglar alarms, fire alarms, access control, and video surveillance. Day-to-day work often involves technicians working at client sites for installation and service calls, combined with back-office or central-station monitoring operations. Many firms earn recurring monthly revenue from monitoring contracts in addition to installation and repair work.
Questions to investigate
- Does the business provide remote monitoring services, and if so, approximately how many accounts are monitored?
- What types of clients are served — residential, light commercial, or sensitive/high-value facilities such as banks or government buildings?
- Do monitoring or installation contracts include limitation-of-liability clauses, and if so, at what level?
- Do technicians use company vehicles, personal vehicles, or both for service calls?
This insurance research was generated in April 2026. It has not received a complete human review. The October 12, 2026 audit checked codes and titles only, not descriptions or coverage assertions.