| Burris Builders INC | Richard Wayne Jr Burris | info@burrisbuilders.com | (925) 433 1485 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Burton Builders LLC | Gabriel Ivan Alvarez | — | (510) 949 7840 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Burton Underground INC | Albert Dominic Iii Seeno | — | (925) 682 6419 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Burtt Construction Services | Eric Robert Burtt | — | (510) 540 0155 | Electricians | Orinda · Contra Costa County | — | — |
| Busch Electric INC | Linda Marie Rodgers | — | (925) 690 8216 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Bustamante Construction | Camilo Alexander Bustamante Iraira | — | (341) 732 6714 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Butch Gill Painting | Butch Gill Painting | — | (925) 323 4455 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Bwi/tpc A Joint Venture | Perini Corporation Tutor | — | (925) 932 7900 | Other | Walnut Creek · Contra Costa County | — | — |
| Bycnn LLC | Padilla Joel | — | (650) 544 0373 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Byron Crowley Construction INC | Crowley Byron | — | (415) 317 9317 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| C & C Fire Protection INC | Robert Lyn Jr Corriea | — | (925) 289 7655 | Other | Concord · Contra Costa County | — | — |
| C & C Tree Solutions | C & C Tree Solutions | — | (510) 330 6201 | Tree | Concord · Contra Costa County | — | — |
| C & H Plumbing Corporation | Thomas Maynard Gunsul | — | (707) 334 4734 | Other | Martinez · Contra Costa County | — | — |
| C & J Electric Company | Ardith Vern Jones | — | (510) 919 1946 | Electricians | Walnut Creek · Contra Costa County | — | — |
| C & J Paint Pros INC | Carolina Mendez Lopez | — | (408) 685 6226 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| C & T Rodent Control Exclusion & Pest Control | C & T Rodent Control Exclusion & Pest Control | info@candtpestcontrol.com | (800) 461-9886 | Pest, tile roofs | Contra Costa · Contra Costa County | — | — |
| C & W Tree & Landscape Co | Clifford Edwin West | — | (925) 229 4999 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| C / S Erectors INC | Roger Landon Iii Osburn | — | (925) 820 8113 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| C A Mc Kee Construction General Contractor | Charles Albert Mc Kee | — | (925) 906 9942 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| C A Stanley Construction INC | Cody Augustus Stanley | — | (925) 584 9890 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| C And J Installs LLC | Cameron William Cheak | — | (925) 787 4658 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| C B 2 Builders Incorporated | Lori Ann Campagna | — | (415) 402 0360 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| C B A Home Building Services | Chris J Brown | — | (702) 587 2209 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| C B M Remodeling | C B M Remodeling | — | (650) 867 3670 | GC, remodel, ADU | Hercules · Contra Costa County | — | — |
| C B P Construction INC | Bautista-pech Conrado | — | (415) 656 9922 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| C B Pro Construction | Bognari Constantin | — | (925) 864 1331 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| C C R Construction INC | Charles C Rottmann | — | (925) 890 1918 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| C D & Power | Lisa Marie Carter | — | (925) 229 2700 | Electricians | Martinez · Contra Costa County | — | — |
| C D M Asphalt | C D M Asphalt | — | (925) 459 4158 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| C D Plumbing Construction | Dino Delvin Konrai | — | (925) 639 9939 | Other | Walnut Creek · Contra Costa County | — | — |
| C De Leon Plumbing Co | De Leon Cresencio | — | (510) 385 3877 | Other | El Sobrante · Contra Costa County | — | — |
| C E Construction | Carlos Enrique Escalera | — | (510) 672 7057 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| C E Electric | Elizarraraz Cayetano | — | (925) 625 5388 | Electricians | Oakley · Contra Costa County | — | — |
| C E Z Electric | Christopher Eric Zanetta | — | (831) 595 0021 | Electricians | Pacheco · Contra Costa County | — | — |
| C Fer Construction INC | Carlos Fernando Becerra-diaz | — | (510) 949 9202 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| C H & L Landscaping | Alejandro Chavez Rodriguez | — | (925) 231 5714 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| C H F Flooring | Hernandez Fernandez Candelario | — | (925) 597 1632 | Other | Antioch · Contra Costa County | — | — |
| C H I Construction | Ruslan Alexandrovic Petrov | — | (415) 748 8204 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| C H U B A Construction | Alexander Mikhailovich Chuba | chubaconstruction@gmail.com | (925) 322-1106 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| C Hammond Construction | Clifford Henry Hammond | — | (510) 412 4466 | Other | Richmond · Contra Costa County | — | — |