MASSONE MECHANICAL INC
California contractor license #615532 · Alamo, Contra Costa County
License
- License number
- 615532
- Status
- Clear
- Classifications
- C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor
- C-38 Refrigeration Contractor
- Business type
- Corporation
- Issued
- Mar 19, 1991
- Expires
- Mar 31, 2027
- Workers' compensation
- Workers' Compensation Insurance — Oak River Insurance Company
- Contractor's bond
- $25,000 — American Contractors Indemnity Company
- DIR public works registration
- Registered through Jun 30, 2027
From the California Contractors State License Board (CSLB) public license file, last updated Jan 12, 2026. Verify license #615532 on CSLB's License Check.
California public works
MASSONE MECHANICAL INC appears on 5 public works projects registered with the California Department of Industrial Relations, 4 of them as the prime contractor, for 3 awarding bodies between 2024 and 2026. Projects it led total $401,507 in reported contract value.
| Date | Project | Awarding body | Role | Contract amount |
|---|---|---|---|---|
| Jul 30, 2026 | Various Sites Refrigeration Repair ServiHVAC & mechanical | West Contra Costa Unified School District | Prime | $50,000 |
| May 13, 2026 | 2026 Central Kitchen Walk-in FreezerHVAC & mechanical | MT. DIABLO UNIFIED SCHOOL DISTRICT PURCHASING | Prime | $67,200 |
| Aug 27, 2025 | Central Kitchen ModernizationBuildings & facilities | West Contra Costa Unified School District | Subcontractor | $14,390,000 |
| Oct 8, 2024 | DW Refrigeration Repair ServiceHVAC & mechanical | West Contra Costa Unified School District | Prime | $45,000 |
| Aug 19, 2024 | 2099 Arnold Walk- In ReplacementHVAC & mechanical | Contra Costa County | Prime | $239,307 |
Most recent 5 of 5. 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
- West Contra Costa Unified School District · 3 projects
- Contra Costa County · 1 project
- MT. DIABLO UNIFIED SCHOOL DISTRICT PURCHASING · 1 project
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