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.
Bid count updated
- NAICS code
- 561621
- Title
- Security Systems Services (except Locksmiths)
- Sector
- 56 Administrative and Support and Waste Management and Remediation Services
- Subsector
- 561 Administrative and Support Services
- Industry group
- 5616 Investigation and Security Services
- NAICS industry
- 56162 Security Systems Services
- SBA size standard
- $25 million average annual receipts
- Open bids on BidRover
- 2
Open bids citing NAICS 561621
Frequently asked questions
What is NAICS code 561621?
NAICS 561621 is "Security Systems Services (except Locksmiths)" in the 2022 North American Industry Classification System, in sector 56 (Administrative and Support and Waste Management and Remediation Services). 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?
A business is small under NAICS 561621 at or below $25 million average annual receipts, including affiliates (13 CFR 121.201). Confirm the standard named in each solicitation.
How many government bids are open under NAICS 561621?
BidRover counts 2 open bids that cite NAICS 561621 as of Oct 23, 2026, refreshed every hour from official public sources. Many state and local notices do not list a NAICS code, so search by keyword too.
How do I get alerts for NAICS 561621 bids?
Save an alert on this page. A free account gets new matching bids by weekly email; the Team plan ($19/mo) sends daily alerts with match scores, the buyer, source link and documents.
Title and definition: U.S. Census Bureau, North American Industry Classification System (NAICS), 2022. Size standard: U.S. Small Business Administration, Small Business Size Standards, 13 CFR 121.201 (eCFR text as of Oct 21, 2026). Bid counts come from official public sources and refresh every hour; confirm the code and size standard in each solicitation.