| Chun Chuan Ma | Chun Chuan Ma | — | (510) 565 2090 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Chung-chi Kang | Chung-chi Kang | — | (510) 220 1558 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Chuong Hoang | Chuong Hoang | chuonghoang.ca@gmail.com | (510) 962 2156 | Windows, patio, painters | Newark · Alameda County | — | — |
| Circuitry Electric | Mosaha Daniel Herrera-perez | — | (408) 505 8916 | Electricians | Pleasanton · Alameda County | — | — |
| Cisco Electric | Francisco Javier Ramos | — | (510) 688 4582 | Electricians | Castro Valley · Alameda County | — | — |
| Citi Bay Painting | Citi Bay Painting | — | (480) 200 3567 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Citi Oak General Builders LLC | U Kimny | — | (650) 670 2372 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| City By The Bay Developers INC | Petrus Johannes Van Luffelen | — | (925) 580 1177 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| City Cottages | City Cottages | — | (510) 409 1797 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| City Floors | City Floors | — | (415) 378 3710 | Other | Berkeley · Alameda County | — | — |
| City Of Paris Mosaics Tile & Design | Debra Ann Buckley | — | (510) 301 1280 | Other | Oakland · Alameda County | — | — |
| City Paintworx | Saul Sanchez | — | (510) 830 7973 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Cityway Electric INC | Elvis Efren Villeda Landaverde | impallari@gmail.com | (650) 515 5014 | Electricians | Hayward · Alameda County | — | — |
| Citywise Quality Construction INC | Wai Tai Lee | — | (415) 606 3372 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Clamar's All Phase Construction INC | Mario Edward Clamar | — | (510) 813 6273 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Clamar's Precisions Builds | Clamar's Precisions Builds | — | (510) 938 1162 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Claremont Landscaping | Claremont Landscaping | hugaton@mac.com | (510) 524 0500 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Clark T Thiel | Clark T Thiel | — | (415) 867 5104 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Classic Construction Company | Brooks David Weitzman | — | (510) 708 5120 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Classic Glass & Shower INC | Wayne Bradley Jr Lucas | — | (510) 714 4297 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Clay Jensen | Clay Jensen | — | (925) 584 8116 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Claycon Developers Corp | Adonte Edward Clayton | — | (510) 712 5742 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Clean Tech Lighting And Power | Clean Tech Lighting And Power | — | (510) 575 4233 | Electricians | Oakland · Alameda County | — | — |
| Clear Point Hardwood Floor | Clear Point Hardwood Floor | — | (510) 278 3185 | Other | San Leandro · Alameda County | — | — |
| Clear Sky Construction Inc. | Clear Sky Construction Inc. | — | (510) 239-9186 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Clearpath Builders LLC | Liu Dapeng | — | (408) 646 2888 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Clearshot Electric INC | Michael Scott Sandnas | contact@clearshotelectric.com | (510) 980 8790 | Electricians | Newark · Alameda County | — | — |
| Clearstone Chimney Inspection Services | Clearstone Chimney Inspection Services | — | (510) 275-0289 | Inspectors | Alameda · Alameda County | — | — |
| Clearwater Plumbing | Clearwater Plumbing | — | (408) 245 7586 | Other | Castro Valley · Alameda County | — | — |
| Clearwater Pool Service And Repair | Gregory Michael Simi | — | (925) 964 1900 | Pool | Oakland · Alameda County | — | — |
| Clementine Construction | George Williams Iv Rutherford | — | (510) 409 1229 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Clementson Painting INC | Ivan Adali Castro Velasquez | — | (408) 561 2959 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Clever Construction INC | Jon Jun | — | (415) 314 0003 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Cliff Olson Construction | Clifford Raymond Olson | — | (510) 461 9047 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Cliffero Painting & Decorating Co | Aubrey Dean Clifton | — | (510) 414 4746 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Clifford E Mapes | Clifford E Mapes | — | (510) 569 4168 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Climate Pros LLC | Scott Keith Rinker | cs@climatepros.com | (630) 893 8511 | HVAC | Hayward · Alameda County | — | — |
| Climatecare Boiler Works | Peter Jacob Ellery | — | (510) 244 7566 | HVAC | Hayward · Alameda County | — | — |
| Cline Glass Contractors INC | Thomas Francis Cline | — | (510) 490 4400 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Clingerman Painting & Decorating INC | David Scott Clingerman | — | (925) 479 0590 | Windows, patio, painters | Dublin · Alameda County | — | — |