NAICS 561621: Security systems services federal contracts, size limit and who buys
Federal spending, new contracts, buying agencies and set-asides for NAICS 561621 (security systems services), from USAspending.gov, with the SBA size limit and what the code covers.
Alarm and security system monitoring, and alarm sales combined with installation, repair or monitoring. Locksmiths are 561622. Installing alarm wiring alone is 238210.
| Small business size limit | $25.0 million average annual revenue |
|---|---|
| Federal spending, FY2026 | $711 million |
| New contracts and orders, FY2026 | 1,225 |
| Typical new standalone contract | $73,000 (middle half $43,000 to $167,000) |
| Set aside for small businesses | 36% of new standalone contracts |
| Women-owned set-asides | WOSB |
Most new contracts here aren't set aside: 262 of 407 new standalone contracts in FY2026 had no set-aside.
Spending by year
| Fiscal year | Obligated |
|---|---|
| FY2022 | $744 million |
| FY2023 | $758 million |
| FY2024 | $805 million |
| FY2025 | $784 million |
| FY2026 | $711 million |
Federal fiscal years run October to September. Defense Department contract data is published 90 days late, so the last months of FY2026 aren't fully counted yet.
Who buys it, and where
- Department of the Navy $143 million
- Department of the Air Force $101 million
- Homeland Security $88 million
- Federal Aviation Administration $52 million
- Department of Veterans Affairs $51 million
- California $175 million
- Virginia $139 million
- DC $77 million
- Maryland $51 million
- Michigan $27 million
How the work is set aside
Of 407 new standalone contracts worth $25,000 or more in FY2026, 145 were set aside for small businesses or a certified group. Our guide to set-asides explains who qualifies for each.
| Set-aside | Contracts |
|---|---|
| Small business | 81 |
| Service-disabled veteran-owned | 40 |
| 8(a) | 9 |
| Women-owned | 10 |
| Buy Indian | 5 |
Common questions
What about locksmiths?
Locksmiths have their own code, 561622.
Is installation alone included?
No. Installation only is electrical work, 238210. This code is for monitoring, or sales combined with installation, repair or monitoring.
Related codes
- 238210 electrical contractors
- 238220 plumbing, heating and air-conditioning contractors
- 811310 commercial and industrial equipment repair and maintenance
- 561210 facilities support services
Agencies don't always code the same work the same way, so it pays to list several codes. Our guide to which NAICS codes to list explains why.
How we counted: USAspending.gov contract data for NAICS 561621, pulled October 27, 2026. Spending is obligations on all contracts and orders in each fiscal year. New contracts and orders are awards first made in FY2026. Standalone contracts are definitive contracts and purchase orders first awarded in FY2026 and worth at least $25,000, with the amount obligated so far. Agencies and states are ranked by FY2026 obligations. Treat these figures as a guide, not an exact count.
See the security systems bids open near you
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Sources
- USAspending.gov contract data (API, pulled October 27, 2026)
- U.S. Census Bureau: 2022 NAICS manual and index
- SBA size standards, 13 CFR 121.201
- SBA: eligible NAICS for the WOSB program
How we get our numbers: our sources and methods.
General information, not legal advice. AwardRight is an independent consulting service, not affiliated with SAM.gov, the SBA or any government agency.