Federal Contracting by NAICS Code · Facilities & Support
NAICS 561621: Security Systems Services (except Locksmiths)
Installation, repair, and monitoring of electronic security alarm systems — including access control, intrusion detection, and CCTV. Used for federal facility security technology contracts and integrated electronic security work.
📊 Based on 117 real federal solicitations tracked under this code
Sector
Facilities & Support
Typical award value
$250K - $25M per award
Set-aside activity
Yes
Federal agencies that buy under NAICS 561621
These buyers award security systems services (except locksmiths) work under this code most often. Set up alerts on WinAContract to catch their solicitations early, then draft your response in GovCon.
Set-asides used under NAICS 561621
Filtering opportunities by NAICS 561621 and your certification surfaces the bids where large primes are excluded. See our set-aside program guides for how each one works.
Common questions about NAICS 561621
Which federal agencies buy under NAICS 561621?
The agencies that most frequently post security systems services (except locksmiths) solicitations under NAICS 561621 include Department of Homeland Security, GSA, Department of Defense, Department of Veterans Affairs, Department of State (OBO). Tracking these buyers on WinAContract and drafting responses in GovCon is the fastest way to build a pipeline under this code.
Is NAICS 561621 eligible for small-business set-asides?
Yes. Solicitations under NAICS 561621 commonly use Small Business, 8(a), HUBZone, SDVOSB. If your firm holds a matching socioeconomic certification, you can compete on set-aside opportunities where large businesses are excluded — typically a far less crowded field.
What is the typical contract value for NAICS 561621?
Federal awards under NAICS 561621 typically range $250K - $25M per award. Actual values vary widely by agency, scope, and contract vehicle — for example, individual IDIQ task orders versus standalone definitive contracts.
What NAICS codes are related to 561621?
Closely related codes include 561612 (561612 · Security Guards and Patrol Services), 238210 (238210 · Electrical Contractors and Other Wiring Installation Contractors), 541512 (541512 · Computer Systems Design Services). Registering in SAM.gov under every code that fits your capabilities widens the set of opportunities you'll match.
Related NAICS codes
Bidding on a NAICS 561621 opportunity?
GovCon is the AI proposal-writing tool built for federal offerors — import the solicitation, draft Sections L & M, and check compliance. Free plan, no card required.
Start free →Browse all NAICS contracting guides, look up any code with the free NAICS lookup tool, or read the federal contracting glossary.