TIER ONE MECHANICAL INC
California contractor license #1071811 · Rancho Dominguez, Los Angeles County
License
- License number
- 1071811
- Status
- Clear
- Classifications
- C-16 Fire Protection Contractor
- C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor
- C-36 Plumbing Contractor
- Business type
- Corporation
- Issued
- Dec 10, 2020
- Expires
- Dec 31, 2026
- Workers' compensation
- Workers' Compensation Insurance — Federal Insurance Company
- Contractor's bond
- $25,000 — Liberty Mutual Insurance Company
- DIR public works registration
- Registered through Jun 30, 2027
From the California Contractors State License Board (CSLB) public license file, last updated Mar 30, 2026. Verify license #1071811 on CSLB's License Check.
California public works
TIER ONE MECHANICAL INC appears on 26 public works projects registered with the California Department of Industrial Relations, 15 of them as the prime contractor, for 7 awarding bodies between 2020 and 2026. Projects it led total $530,556 in reported contract value.
| Date | Project | Awarding body | Role | Contract amount |
|---|---|---|---|---|
| Sep 1, 2026 | Bldg 89A Re-Route Water LineWater | California State Polytechnic University Pomona | Prime | $33,645 |
| Aug 6, 2026 | BLDG 61, 62, Copper Pipe RepairsBuildings & facilities | Cal Poly Pomona | Prime | $10,581 |
| Jul 13, 2026 | Emergency PlumbingPlumbing & restrooms | Cal Poly Pomona | Prime | $39,802 |
| Jul 1, 2026 | EMEGENCY SEWER SERVICE MAINTENANCE AND PSewer & wastewater | Cal Poly Pomona | Prime | $41,000 |
| Jun 1, 2026 | BLDG 63, Repair Underground Hot WaterBuildings & facilities | Cal Poly Pomona | Prime | $21,085 |
| Mar 30, 2026 | Emergency Repair Hot Water Leak Bldg 61Paving & streets | California State Polytechnic University Pomona | Prime | $176,803 |
| Nov 21, 2025 | Replace 6" Reclaimed Water MainWater | HECTOR | Prime | $15,913 |
| Nov 10, 2025 | 20261098HVAC & mechanical | HECTOR | Prime | $44,968 |
| Oct 1, 2025 | Bldg 4 , Heater ReplacementBuildings & facilities | HECTOR | Prime | $24,778 |
| Apr 16, 2025 | Replace 6" Reclaimed RiserParks, landscape & fields | HECTOR | Prime | $26,775 |
| Mar 4, 2025 | Boiler replacement for bldg. 23HVAC & mechanical | Cal Poly Pomona | Prime | $36,113 |
| Jan 31, 2025 | Underground Leak Casa DriveWater | California State Polytechnic University Pomona | Prime | $24,626 |
| Oct 9, 2024 | Replace Water HeaterPlumbing & restrooms | HECTOR | Prime | $15,710 |
| Sep 27, 2024 | Backflow Valve Repl Bldg 98Plumbing & restrooms | California State Polytechnic University Pomona | Prime | — |
| Sep 4, 2024 | IHP3011124Other | IEHP Inland Empire Health Plan | Prime | $18,758 |
| May 23, 2023 | Equity Innovation HubOther | California State University, Northridge | Subcontractor | — |
| Nov 30, 2022 | Falling Leaves Foundation Medical InnovaOther | UC Irvine | Subcontractor | — |
| Jan 24, 2021 | Facility O&M Services - SRO-Ventura-2021Buildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
| Jan 24, 2021 | Facility O&M Services - SRO-Santa BarbarBuildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
| Jan 23, 2021 | Facility O&M Services - SRO-Imperial-202Buildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
| Jan 23, 2021 | Facility O&M Services - SRO-San Diego-20Buildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
| Jan 23, 2021 | Facility O&M Services - SRO-Riverside-20Buildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
| Jan 19, 2021 | Facility O&M Services - SRO-Los Angeles-Buildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
| Jan 11, 2021 | Facility O&M Services - SRO-San BernardiBuildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
| Jan 10, 2021 | Facility O&M Services - SRO-Kern-2021Buildings & facilities | Judicial Council of California - (PUB WORKS) | Subcontractor | — |
Most recent 25 of 26. Contract amounts are the whole project's, as the awarding body reported them to DIR (reported since July 2024); a role is "Prime" when the awarding body registered the contractor on the project.
Awarding bodies it works for most
- Judicial Council of California - (PUB WORKS) · 9 projects
- Cal Poly Pomona · 5 projects
- HECTOR · 5 projects
- California State Polytechnic University Pomona · 4 projects
- California State University, Northridge · 1 project
- IEHP Inland Empire Health Plan · 1 project
- UC Irvine · 1 project
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