DIABLO BOILER & STEAM INC
California contractor license #530963 · Antioch, Contra Costa County
License
- License number
- 530963
- Status
- Clear
- Classifications
- C-4 Boiler, Hot-Water Heating and Steam Fitting Contractor
- Business type
- Corporation
- Issued
- May 25, 1988
- Expires
- Sep 30, 2028
- Workers' compensation
- Workers' Compensation Insurance — State Compensation Insurance Fund
- Contractor's bond
- $25,000 — Atlantic Specialty Insurance Company
- DIR public works registration
- Registered through Jun 30, 2028
From the California Contractors State License Board (CSLB) public license file, last updated Sep 3, 2026. Verify license #530963 on CSLB's License Check.
California public works
DIABLO BOILER & STEAM INC appears on 8 public works projects registered with the California Department of Industrial Relations, 8 of them as the prime contractor, for 2 awarding bodies between 2025 and 2026. Projects it led total $177,475 in reported contract value.
| Date | Project | Awarding body | Role | Contract amount |
|---|---|---|---|---|
| Sep 9, 2026 | Fairmont Hospital - “Fulton” boilers SB-HVAC & mechanical | Alameda Health System (AHS) | Prime | $5,180 |
| Aug 14, 2026 | John George - AjaxOther | Alameda Health System (AHS) | Prime | $13,852 |
| Aug 10, 2026 | Fairmont Hospital - Building C SB2 BoileHVAC & mechanical | Alameda Health System (AHS) | Prime | $3,650 |
| May 28, 2026 | John George - Circulating Pump #3Other | Alameda Health System (AHS) | Prime | $4,120 |
| Jan 13, 2026 | Fairmont Hospital - Weld Repair on the "Plumbing & restrooms | Alameda Health System (AHS) | Prime | $8,416 |
| Nov 11, 2025 | Fairmont Hospital - Troubleshooting (1)HVAC & mechanical | Alameda Health System (AHS) | Prime | $3,694 |
| Nov 11, 2025 | Fairmont Hospital - Leaking Valve on (1)HVAC & mechanical | Alameda Health System (AHS) | Prime | $1,731 |
| Aug 27, 2025 | Boiler Repairs and MaintenanceHVAC & mechanical | Department of General Services | Prime | $136,833 |
Most recent 8 of 8. 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
- Alameda Health System (AHS) · 7 projects
- Department of General Services · 1 project
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