| Calwest Paving Co | Jesse Joseph Avila | calwestpaving@yahoo.com | (925) 383 1068 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Calwood Construction Co | Jose Luis Martinez | — | (925) 586 5884 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Camacho Glass & Construction INC | Robert George Camacho | — | (925) 488 7475 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Camber Integration Company | Kenneth John Knotek | info@camberintegration.com | (415) 656 8966 | Other | Pleasant Hill · Contra Costa County | — | — |
| Cameron Builders INC | Douglas James Home | info@cameronhomebuilders.com | (925) 377 7400 | GC, remodel, ADU | Moraga · Contra Costa County | — | — |
| Cameron H Ebding | Cameron H Ebding | — | (925) 891 4452 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Cameron Sly | Cameron Sly | — | (925) 998 0351 | Other | Byron · Contra Costa County | — | — |
| Campanella Corporation | Daniel Orlando Jr Lebron | sparky@campanella.com | (510) 536 4800 | Other | Byron · Contra Costa County | — | — |
| Campbell Services LLC | Craig Demerritt Campbell | craigcampbellservices@gmail.com | (510) 501 8484 | Other | Lafayette · Contra Costa County | — | — |
| Campisi INC | Adam Benjamin Campisi | — | (408) 309 0701 | Other | Martinez · Contra Costa County | — | — |
| Campos Interlocking Pavers | Gustavo Campos | — | (510) 672 6117 | Other | Hercules · Contra Costa County | — | — |
| Candler Electric | Joshua James Candler | — | (925) 222 0804 | Electricians | Martinez · Contra Costa County | — | — |
| Candy's Landscape INC | Barragan Candelario | — | (925) 250 1280 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Cangao Chu | Cangao Chu | — | (626) 823 8260 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Canine Construction | Jose Luis Peraza Lizarraga | — | (925) 325 2247 | Other | Antioch · Contra Costa County | — | — |
| Cantechtools LLC | Alain Rene Descoins | — | (925) 323 2763 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Cantor Design | Cantor Design | — | (510) 507 2279 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Capitol Landscaping | Capitol Landscaping | — | (510) 434 8498 | Windows, patio, painters | Pinole · Contra Costa County | — | — |
| Captain Rooter And Plumbing | Captain Rooter And Plumbing | captainrooter@icloud.com | (888) 487 1431 | Other | El Sobrante · Contra Costa County | — | — |
| Carbon Zero Buildings INC | Andrew John Mcnamara | — | (510) 255 0044 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Carbone Construction INC | Kurt Francis Carbone | — | (925) 383 2427 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Cardona Construction | Carlos Estuardo Cardona | cardonaconstructioninc@gmail.com | (415) 374 3936 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Cardona Construction INC | Rene Cardona | cardonaconstructioninc@gmail.com | (925) 642 6349 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Cardona Home Development | Fernadez Margarito Cardona | — | (925) 325 3317 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Cardona Landscape | Cardona Landscape | — | (925) 890 5581 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Careful Construction | Chris Joseph Fellows | — | (925) 727 8590 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Carey Bros Remodeling | James Orrick Carey | — | (877) 734 6404 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Carjo Group East Bay INC | Carlos Dimas Gonzalez | — | (925) 216 6600 | Other | Pittsburg · Contra Costa County | — | — |
| Carl Chambers Construction | Carl Anthony Chambers | — | (510) 414 7712 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Carlos Hernandez Cuevas | Carlos Hernandez Cuevas | — | (925) 775 8029 | Other | Antioch · Contra Costa County | — | — |
| Carlos Insulation INC | Luis Ramos | carlos@carlosinsulation.com | (925) 207 9469 | HVAC | Brentwood · Contra Costa County | — | — |
| Carlos Nowell Concrete Solutions | Carlos Nowell Concrete Solutions | — | (818) 458 7668 | Other | San Pablo · Contra Costa County | — | — |
| Carlos Pools And Landscaping | Carlos Pools And Landscaping | — | (925) 250 5174 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Carlos Reyes Flooring | Carlos Reyes Flooring | — | (510) 621 8092 | Other | Richmond · Contra Costa County | — | — |
| Carlos Tenorio Construction Service | Carlos A Tenorio | — | (510) 589 0590 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Carlson Painting | Carlson Painting | — | (925) 699 4645 | Windows, patio, painters | Danville · Contra Costa County | — | — |
| Carlson William Ventures | Eric William Jr Lakin | — | (925) 330 1138 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Carmichael Const | Carmichael Const | — | (925) 457 0014 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Carmichael Construction | Joseph William Carmichael | — | (925) 890 9253 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Carone & Company INC | Jane Ann Carone | — | (925) 602 8800 | GC, remodel, ADU | Concord · Contra Costa County | — | — |