NAICS 561621 · Administrative and Support and Waste Management and Remediation Services
NAICS 561621: Security Systems Services (except Locksmiths)
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.
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.
Not in this code
Establishments primarily engaged in selling security alarm systems for buildings, without installation, repair, or monitoring services are classified in Sector 42, Wholesale Trade, or Sector 44-45, Retail Trade.
Establishments primarily engaged in installing alarm systems (e.g., fire, burglar), without selling or monitoring services are classified in Industry 238210, Electrical Contractors and Other Wiring Installation Contractors.
Establishments primarily engaged in retailing motor vehicle security systems, with or without installation or repair services are classified in Industry 441330, Automotive Parts and Accessories Retailers.
SBA size standard
A business is small under NAICS 561621 if it has no more than $25 million in average annual receipts (averaged over the last five completed fiscal years, including affiliates).
Source: SBA Table of Size Standards, effective 2023-03-17. Always check the size standard printed in the solicitation itself.
Who buys it
Departments that posted the most NAICS 561621 solicitations in the last two years:
ARS Security Door Access Reader Upgrade · Agriculture · California · posted September 28, 2026
Food and Nutrition Administration Access Control System Upgrade · Agriculture · Colorado · posted September 28, 2026
J012--Fire Alarm & Fire Protection System Maintenance · Veterans Affairs · posted September 28, 2026
H312--Fire Alarm Maintenance Service Contract FY27 - NEW Base + Four - 583 · Veterans Affairs · posted September 28, 2026
Repair and Maintenance for Naval Hospital Camp Pendleton Security Systems · Department of Defense · California · posted September 25, 2026
IRS Intrusion Detection System, C. Clifton Young Federal Building & US Courthouse · General Services Administration · Nevada · posted September 25, 2026
Fire Alarm and Protection System Inspection and PM · Veterans Affairs · California · posted September 25, 2026
BAFS CCTV Replacement · Department of Defense · Hawaii · posted September 24, 2026
Do this kind of work?
Send XL Eagle your price on an open security systems services (except locksmiths) job. We write and submit the bid under our registrations. If we win, you do the work at your price. No fees.
NAICS 561621 is Security Systems Services (except Locksmiths). 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.
What is the SBA size standard for NAICS 561621?
The size standard for NAICS 561621 is $25 million in average annual receipts. Firms at or under it count as small businesses for contracts assigned this code.
Are there government contracts for security systems services (except locksmiths)?
Yes. 1 government contract is open under NAICS 561621 right now, and 250 were posted in the last 12 months.
Can I bid on NAICS 561621 contracts without registering in SAM.gov?
You need an active SAM.gov registration to win a federal contract in your own name. If you would rather skip that, XL Eagle can bid as the prime contractor using your price, and you do the work as our subcontractor.
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