NAICS 561621
Security Systems Services (except Locksmiths)
Sector: Administrative and Support Services
SBA size standard
$22.0M
Top buying agencies
- Department of Homeland Security
- Department of Defense
- General Services Administration
Open opportunities in NAICS 561621
Updated August 24, 2026696active solicitations
Most active buyers
- Department of Defense416
- Department of Veterans Affairs118
- Interior, Department of the69
- Department of Homeland Security39
- Department of Health and Human Services17
Most common set-asides
- Total Small Business Set-Aside (FAR 19.5)241
- Unrestricted135
- No Set aside used129
- Small Business Set Aside - Total108
- Service-Disabled Veteran-Owned Small Business Set Aside41
Counts reflect active contract opportunities ingested from SAM.gov and refresh daily. Figures move as solicitations are posted, amended, and closed.
Description
Establishments primarily engaged in selling, installing, servicing, and monitoring security and alarm systems, including electronic access control.
Common uses in federal contracting
- Electronic security system installation
- Access control and CCTV integration
- Alarm monitoring and maintenance
How to use this NAICS
Add NAICS 561621 to your SAM.gov entity profile to be identified as a provider in this industry. If you are a small business under the $22.0M size standard, you qualify for small-business set-asides in this code.
See our guide to federal set-asides for a walk-through of which programs you can stack on top of this NAICS.