WILLIAMSON DEVELOPMENT GROUP
California contractor license #990201 · Lake Elsinore, Riverside County
License
- License number
- 990201
- Status
- Clear
- Classifications
- A General Engineering Contractor
- B General Building Contractor
- C-10 Electrical Contractor
- Business type
- Corporation
- Issued
- Jan 29, 2014
- Expires
- Jan 31, 2028
- Workers' compensation
- Workers' Compensation Insurance — Amguard Insurance Company
- Contractor's bond
- $25,000 — Nationwide 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 Jun 19, 2026. Verify license #990201 on CSLB's License Check.
California public works
WILLIAMSON DEVELOPMENT GROUP appears on 3 public works projects registered with the California Department of Industrial Relations, 3 of them as the prime contractor, for 2 awarding bodies between 2024 and 2025. Projects it led total $1,007,700 in reported contract value.
| Date | Project | Awarding body | Role | Contract amount |
|---|---|---|---|---|
| Oct 9, 2025 | Nutrition Center Oven ReplacementBuildings & facilities | Ontario-Montclair School District | Prime | $395,000 |
| Oct 9, 2025 | Transportation Server & Storage RoomFire & life safety | Ontario-Montclair School District | Prime | $413,000 |
| Jun 4, 2024 | 2023-24-23 Kitchen InfrastructureOther | Murrieta Valley Unified School district | Prime | $199,700 |
Most recent 3 of 3. 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
- Ontario-Montclair School District · 2 projects
- Murrieta Valley Unified School district · 1 project
Is this your business?
Claim it on Atriam to add your work photos, service area and a booking link, and to run calls, leads, estimates and invoices in one place — free.
Claim this business