DIAMOND D ENGINEERING
California contractor license #1027104 · Ukiah, Mendocino County
License
- License number
- 1027104
- Status
- Clear
- Classifications
- A General Engineering Contractor
- HAZ Hazardous Substance Removal Certification
- Business type
- Limited Liability
- Issued
- May 22, 2017
- Expires
- May 31, 2027
- Workers' compensation
- Workers' Compensation Insurance — Hartford Casualty Insurance Company
- Contractor's bond
- $25,000 — Western Surety Company
- DIR public works registration
- Registered through Jun 30, 2027
From the California Contractors State License Board (CSLB) public license file, last updated Sep 1, 2026. Verify license #1027104 on CSLB's License Check.
California public works
DIAMOND D ENGINEERING appears on 10 public works projects registered with the California Department of Industrial Relations, 4 of them as the prime contractor, for 7 awarding bodies between 2022 and 2026. Projects it led total $141,647 in reported contract value.
| Date | Project | Awarding body | Role | Contract amount |
|---|---|---|---|---|
| Mar 11, 2026 | Mill Creek Park Vault Restroom ProjectPlumbing & restrooms | COUNTY OF MENDOCINO Facilities & Fleet Division | Prime | $69,293 |
| Dec 15, 2025 | Cottonwood structural assessmentBuildings & facilities | Yolo County Housing | Prime | $17,359 |
| Sep 25, 2025 | Water Tank Landslide RepairWater | City of Ukiah | Subcontractor | $45,141 |
| Sep 24, 2025 | Landfill Slide RepairOther | City of Ukiah | Subcontractor | $45,320 |
| Jul 7, 2025 | 2025 Old Hwy 53 Guardrail RepairTraffic & signals | City of Clearlake | Prime | $24,953 |
| Feb 6, 2025 | Golf Course SlideStorm drain & flood control | City of Ukiah | Prime | $30,042 |
| Jan 25, 2024 | Bollards Removal ProjectOther | City of Healdsburg | Subcontractor | $41,986 |
| Sep 18, 2023 | Jack of Hearts Road Upgrade & StormproofPaving & streets | Mendocino County Resource Conservation District | Subcontractor | — |
| Sep 12, 2023 | Corral Creek Road Upgrade & StormproofinPaving & streets | Mendocino County Resource Conservation District | Subcontractor | — |
| Dec 21, 2022 | Seismic Monitoring Container Vault ReplaOther | University of CA-Berkeley | Subcontractor | — |
Most recent 10 of 10. 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
- City of Ukiah · 3 projects
- Mendocino County Resource Conservation District · 2 projects
- City of Healdsburg · 1 project
- City of Clearlake · 1 project
- COUNTY OF MENDOCINO Facilities & Fleet Division · 1 project
- Yolo County Housing · 1 project
- University of CA-Berkeley · 1 project
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