NAICS Code for Security Systems Company
The NAICS code for a security systems company is 561621, Security Systems Services (except Locksmiths). Companies that sell security or fire alarm systems combined with installation, repair or monitoring use 561621, Security Systems Services (except Locksmiths). If you install alarm wiring only, Census classifies that as electrical contracting (238210). Camera and access control installers should pick whichever describes most of their work.
Related codes to add
Most businesses list several NAICS codes. Use 561621 as your primary if it covers most of your revenue, and add these when they describe work you also do:
| Code | Use it when | Size standard |
|---|---|---|
| 238210 Electrical Contractors and Other Wiring Installation Contractors | You install alarm systems only, without sales, monitoring or service. | $19 million or less in receipts |
| 561622 Locksmiths | You're a locksmith. | $25 million or less in receipts |
| 561612 Security Guards and Patrol Services | You provide security guards. | $29 million or less in receipts |
How to choose
Your primary NAICS code should match the work that brings in most of your revenue, and it sets which size standard applies to you for most set-aside contracts. Read each code's Census definition before you register. Our guide on how to choose NAICS codes covers the trade-offs. To see whether you count as small under these codes, try the size standard checker.
Frequently asked questions
What is the NAICS code for a security systems company?
The NAICS code for a security systems company is 561621, Security Systems Services (except Locksmiths). Companies that sell security or fire alarm systems combined with installation, repair or monitoring use 561621, Security Systems Services (except Locksmiths). If you install alarm wiring only, Census classifies that as electrical contracting (238210). Camera and access control installers should pick whichever describes most of their work.
What is the SBA size standard for NAICS 561621?
A business counts as small under NAICS 561621 with $25 million or less in average annual receipts, under the SBA's table of size standards. Federal contracts set aside for small businesses under this code are limited to firms that meet it.
Can I list more than one NAICS code?
Yes. In your SAM.gov registration you pick one primary NAICS code and can add as many others as describe work you can actually do. Add every code below that fits, because agencies search and set aside contracts by code.