CORNERSTONE ROOFING INC
California contractor license #909400 · Sebastopol, Sonoma County
License
- License number
- 909400
- Status
- Clear
- Classifications
- C-39 Roofing Contractor
- Business type
- Corporation
- Issued
- Jan 18, 2008
- Expires
- Jan 31, 2028
- Workers' compensation
- Workers' Compensation Insurance — Insurance Company Of The West
- Contractor's bond
- $25,000 — Great American Insurance Company
- DIR public works registration
- Registered through Jun 30, 2029
From the California Contractors State License Board (CSLB) public license file, last updated Sep 24, 2026. Verify license #909400 on CSLB's License Check.
California public works
CORNERSTONE ROOFING INC appears on 10 public works projects registered with the California Department of Industrial Relations, 4 of them as the prime contractor, for 6 awarding bodies between 2023 and 2026. Projects it led total $213,657 in reported contract value.
| Date | Project | Awarding body | Role | Contract amount |
|---|---|---|---|---|
| Oct 2, 2026 | Penngrove roof repairsRoofing | Petaluma Joint Union High School District | Prime | $26,888 |
| Mar 24, 2026 | Casa Grande HS Library roofingRoofing | Petaluma Joint Union High School District | Prime | $68,849 |
| Mar 10, 2026 | Casa Grande HS Library ReRoofRoofing | Petaluma Joint Union High School District | Prime | $58,000 |
| Feb 20, 2026 | Evergreen Roofing ProjectRoofing | Cotati-Rohnert Park Unified School District | Prime | $59,920 |
| Jun 9, 2025 | SHPS Roof Replacement & Dry Rot RepairsPaving & streets | St. Helena Unified School District | Subcontractor | $1,795,397 |
| Apr 10, 2025 | Forestville School AlterationRoofing | Forestville Union School District | Subcontractor | $2,240,204 |
| Jun 11, 2024 | Horicon Elementary 2024 ModernizationBuildings & facilities | Horicon School District | Subcontractor | $4,360,000 |
| Jun 10, 2024 | Forestville ReroofBuildings & facilities | Forestville Union School District | Subcontractor | — |
| Dec 11, 2023 | MACKERRICHER SPStorm drain & flood control | DEPARTMENT OF PARKS AND RECREATION-PARK OPERATIONS | Subcontractor | — |
| — | SHES Bldg A,B&E Roof, Drainage & HVACStorm drain & flood control | St. Helena Unified School District | Subcontractor | $3,987,605 |
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
- Petaluma Joint Union High School District · 3 projects
- St. Helena Unified School District · 2 projects
- Forestville Union School District · 2 projects
- Cotati-Rohnert Park Unified School District · 1 project
- DEPARTMENT OF PARKS AND RECREATION-PARK OPERATIONS · 1 project
- Horicon School District · 1 project
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