By Outrider Editorial Team · Updated August 20, 2026
Official definition
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.
FY2025 obligations
$783.9M
Contract actions
4,121
IDVs
253
Top buying agencies
- Department of Defense$444.5M
- Department of Homeland Security$108.9M
- Department of Justice$52.0M
- Department of Veterans Affairs$50.1M
- Department of Transportation$37.1M
FY2025 federal contract obligations, USAspending.gov
NAICS 561621 obligated $784 million in FY2025 across 4,121 contract actions. DoD is $444 million, DHS $109 million, DOJ $52 million, VA $50 million, DOT $37 million. The spread across agencies is wide because every federal facility eventually recapitalizes its access control and intrusion detection, and those projects are sized between $100,000 and a few million, which is a comfortable range for a mid-size integrator.
What belongs here
Selling security alarm systems such as burglar and fire alarms together with installation, repair, or monitoring, or remotely monitoring electronic security alarm systems. The bundling is the defining feature. Selling the system and servicing it is what puts you in this code.
- Installing conduit, cabling, and devices as an electrical trade scope is 238210.
- Manufacturing the panels, sensors, and cameras is an electronics code, commonly 334290.
- Guard forces monitoring those systems on site are 561612.
Competing in this code
253 IDVs against 4,121 actions leaves plenty of individually competed work. What narrows the field is federal-specific compliance rather than trade capability: physical access control systems on federal facilities must meet FIPS 201 and the approved products requirements, and DoD installations add their own approval process. An integrator who can name the approved product line, the certified installers, and the cybersecurity authorization path for a networked system is answering questions the electrical contractor bidding against them cannot.
Frequently Asked
NAICS 561621 questions, answered.
What is the SBA size standard for NAICS 561621?
SBA sets it at $25 million in average annual receipts, averaged over your last five completed fiscal years. Come in at or under that and you are small on every NAICS 561621 solicitation, including the set-asides.
Which agencies buy security systems under NAICS 561621?
FY2025 obligations: DoD ($444 million), DHS ($109 million), DOJ ($52 million), VA ($50 million), DOT ($37 million). The wide spread reflects a recurring facility need, not a program, which is why award sizes stay in a range a mid-size integrator can handle.
What is the difference between NAICS 561621 and 238210?
561621 sells the security system and provides installation, service, or monitoring as a package. 238210 is the electrical installation trade performing conduit, cabling, and device work as construction. Solicitations bundling system supply with monitoring use 561621; those written as a building trade scope use 238210, and they attract completely different bidders.
What compliance requirements apply to federal access control systems?
Physical access control systems on federal facilities have to meet FIPS 201 requirements and use products from the approved list, and networked systems need a cybersecurity authorization path. DoD installations layer on their own approval process. Naming the approved product line and certified installers is what separates a credible bid from a commercial one.
Register Under NAICS 561621
Classify your business correctly to maximize visibility to federal buyers and access small business set-asides.
Start Your SAM.gov Registration →