NAICS REFERENCE
NAICS 561621: Security Systems Services
Security systems services covers selling, installing, monitoring, and servicing security alarm and surveillance systems.
DIRECT ANSWER
What is NAICS 561621?
NAICS 561621, Security Systems Services, is a security services classification. Contractors can use it to filter relevant federal awards, then check scope, incumbent, agency, timing, and public notices before treating an expiring award as a credible recompete.
REFERENCE
What This Code Covers
Security systems services covers selling, installing, monitoring, and servicing security alarm and surveillance systems.
Use the code as a starting point for scope review. The contract statement of work, buyer office, vehicle, incumbent, and timing still decide whether an opportunity fits.
- Alarm system monitoring
- Common work pattern for Security Systems Services.
- Security system installation
- Common work pattern for Security Systems Services.
- Access control systems
- Common work pattern for Security Systems Services.
- Surveillance systems support
- Common work pattern for Security Systems Services.
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What This Code Usually Does Not Cover
Adjacent codes matter because a saved search can miss good work or create noise when the scope is classified differently.
- Adjacent distinction
- Security guard staffing belongs closer to 561612.
- Adjacent distinction
- General electrical contracting belongs closer to 238210.
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Federal Contracting Context
Security services requirements should be reviewed against agency fit, place of performance, incumbent history, set-aside context, and the current award period.
Prime Leads treats NAICS as a filter, not a guarantee. A stronger read pairs the code with contract cliff timing and public procurement motion such as Sources Sought notices or RFIs.
- Why prioritized
- Named in the first Hyperagent NAICS batch as a physical security systems lane.
- Demand signal
- Security system requirements often connect to facility modernization, recurring monitoring, and access control support.
- Monitoring note
- Track active awards under this code, then qualify each one with timing evidence and source context.
FAQ
Questions before you act on the signal.
What does NAICS 561621 mean?
It means Security Systems Services. The code classifies a broad type of work, but the scope and contract documents decide whether it is the right fit.
What kinds of federal contracts use NAICS 561621?
Contracts that primarily match security services work may use this code, especially when the scope includes alarm system monitoring or security system installation.
How can I monitor recompetes for NAICS 561621?
Track active awards in the code, watch period-of-performance cliffs, compare incumbent and scope history, and look for Sources Sought, RFI, forecast, or modification signals.