Contra Costa County construction: bids, contractors and projects
Caltrans lettings, licensed contractors and project news for Contra Costa County, California, updated daily from public records.
Contra Costa County is part of our District 4 (Oakland) coverage area and falls under Caltrans District 4 (Oakland), headquartered in Oakland. CSLB's license file lists 6,898 construction contractors with a Contra Costa County address: 3,675 licensed General Engineering (A) and General Building (B) contractors and 3,223 licensed specialty (C) and Residential Remodeling (B-2) contractors. The largest single group is CSLB General Building (B) contractor (3,213). Most are based in Concord, Antioch, Richmond.
Caltrans's advertised letting schedule currently has 1 upcoming proposal in Contra Costa County, the next on Nov 10, 2026.
Upcoming Caltrans lettings in Contra Costa County
| Letting | Proposal | Major work type | Documents |
|---|---|---|---|
| Nov 10, 2026 | 04-0AA214 | RHMA (Gap Graded), cold plane AC Pvmt, HFST, Mod signals & lighting 路 License A,C-12 | Proposal |
Contractors based in Contra Costa County
Counts come from the Contractors State License Board's License Master file (businesses whose license status is Clear and whose address is in Contra Costa County). Firms holding a General Engineering (A) or General Building (B) classification are counted as general contractors; the rest as specialty contractors.
- CSLB General Building (B) contractor: 3,213
- CSLB specialty (C) contractor: 3,168
- CSLB General Engineering (A) contractor: 462
- CSLB Residential Remodeling (B-2) contractor: 55
Find Contra Costa County subcontractors Find Contra Costa County general contractors
Contra Costa County project news
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How to bid public work in Contra Costa County
State highway work in Contra Costa County is let by Caltrans; the county is in Caltrans District 4 (Oakland) (Caltrans districts). Bidders need a CSLB license and, for public works, DIR public works contractor registration. See how to bid Caltrans contracts.
State agencies buy through Cal eProcure (see the supplier registration guide).
Statewide rules that apply here
- Bidding Caltrans: a CSLB license, DIR registration, a bidder ID and a digital ID
- California mechanics liens: 20 days to give notice, 90 days to record, 90 days to sue
Nearby counties
District 4 (Oakland) region: Alameda 路 Marin 路 Napa 路 San Francisco 路 San Mateo 路 Santa Clara 路 Solano 路 Sonoma
Also in Caltrans District 4: (same as above)