# Tier One Mechanical Inc

Tier One Mechanical Inc is a fire sprinkler company based in Rancho Dominguez, California. It holds an active CSLB C-16 Fire Protection Contractor license (No. 1071811) from the California Contractors State License Board, verified against state records on October 24, 2026.

## California Contractors State License Board licenses

| License | Type | Expires | Status |
|---|---|---|---|
| 1071811 | CSLB C-16 Fire Protection Contractor | December 31, 2026 | active |

## Contact and locations

- Phone: 310-637-1500
- Primary location: 18414 S Santa Fe Avenue, Rancho Dominguez, CA 90221 (Los Angeles County)

## Verify

Search 1071811 at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx to confirm current status.

_Source: California Contractors State License Board (CSLB) licensee records (https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx), retrieved October 24, 2026. Published by Plumb Registry._