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NAICS 561621: Security Systems Services (except Locksmiths)

Security Systems Services (except Locksmiths) is NAICS code 561621. A business is small under it with $25 million or less in average annual receipts. 23 federal contracts are open on SAM.gov under this code right now.

SBA size standard
$25 million or less in average annual receipts
Open contracts now
23
Federal spending, FY2026
$698.3 million
Share won by small businesses
32%
Small businesses registered
3,998
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Open federal contracts for security systems services (except locksmiths)

See all 23 open contracts under NAICS 561621 →

What NAICS 561621 covers

The Census Bureau's NAICS index lists these kinds of work under 561621:

  • Alarm system monitoring services
  • Alarm systems sales combined with installation, repair, or monitoring services
  • Burglar alarm monitoring services
  • Burglar alarm sales combined with installation, repair, or monitoring services
  • Fire alarm monitoring services
  • Fire alarm sales combined with installation, repair, or monitoring services
  • Security alarm systems sales combined with installation, repair, or monitoring services
  • Security system monitoring services

Read the full definition, including what's excluded, on census.gov.

SBA size standard for 561621

To count as a small business for a contract assigned NAICS 561621, your business must have $25 million or less in average annual receipts. Receipts are averaged over your last five completed fiscal years.

From SBA's table of size standards, effective Mar 17, 2023. Confirm it with SBA's size standards tool before you certify your size.

Who buys security systems services (except locksmiths)

Agencies that awarded the most under NAICS 561621 over the last three fiscal years, per USAspending.gov:

AgencyObligated
Department of the Navy$507.4 million
Department of the Air Force$371.2 million
Office of Procurement Operations$259.2 million
Department of the Army$155.6 million
Department of Veterans Affairs$151 million
Federal Aviation Administration$125 million
Washington Headquarters Services$115.9 million
U.S. Marshals Service$108 million

Open notices right now come from Dept of Defense (14), Department of Veterans Affairs (7), General Services Administration (1) and Department of Homeland Security (1).

Set-asides on open 561621 contracts

  • No set-aside (full and open): 13
  • Total small business set-aside: 6
  • Service-disabled veteran-owned set-aside: 4
  • Partial small business set-aside: 1
  • Women-owned set-aside: 1

Not sure which set-asides you qualify for? Try the free SBA certification screener, or read set-aside contracts, explained.

Your competition

3,998 businesses with active SAM.gov registrations are rated small under NAICS 561621, most of them in Texas (450), Florida (391), Virginia (373), California (336) and Maryland (213). Look any of them up with the free CAGE code and UEI lookup.

Federal spending under 561621 by year

Fiscal yearContract obligations
FY2024$805.4 million
FY2025$783.6 million
FY2026$698.3 million
FY2027 (so far)$4.9 million

Source: USAspending.gov, all contract awards with this NAICS code. Fiscal years start October 1.

Related NAICS codes

Frequently asked questions

What is NAICS code 561621?

561621 is the 2022 NAICS code for Security Systems Services (except Locksmiths). The Census Bureau's index lists work such as alarm system monitoring services, alarm systems sales combined with installation, repair, or monitoring services, burglar alarm monitoring services under it. Federal contracting uses the 2022 codes.

What is the SBA size standard for NAICS 561621?

$25 million or less in average annual receipts. A business at or under that is small for contracts assigned this code. The current SBA table took effect Mar 17, 2023.

Are there government contracts for security systems services (except locksmiths)?

Yes. 23 federal contract opportunities under NAICS 561621 are open on SAM.gov right now. Agencies obligated about $698.3 million under this code in fiscal year 2026, according to USAspending.gov.

How do I add NAICS code 561621 to my SAM.gov registration?

Update your entity registration on SAM.gov and add the code on the Goods and Services page, in the Assertions section. You can list several NAICS codes and mark one as your primary. Changes are free.

Keep going

FedReady is an independent company, not affiliated with SBA, SAM.gov, the Census Bureau or any government agency. Open-contract counts come from SAM.gov and update daily; spending figures come from USAspending.gov.