| California House Painting INC | Raymond Ng | — | (415) 312 8898 | Windows, patio, painters | Daly City · San Mateo County | — | — |
| California Iron Works | California Iron Works | — | (415) 822 2794 | Other | Daly City · San Mateo County | — | — |
| California Kitchen Cabinets Custom | California Kitchen Cabinets Custom | — | (510) 853 2006 | Other | Redwood City · San Mateo County | — | — |
| California Symbiosis Group | Juan Victor Garcia Chu | — | (414) 671 5424 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| California Water And Fire Restoration | California Water And Fire Restoration | — | (650) 642 7300 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| California Water Systems | California Water Systems | — | (650) 574 1273 | Other | San Mateo · San Mateo County | — | — |
| California Wood Floors INC | Liam Joseph Hussey | — | (650) 780 9663 | Other | Redwood City · San Mateo County | — | — |
| Calvert Builders | Benjamin Dean Calvert | — | (650) 430 5613 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Calvert Ventures INC | Henry John Calvert | — | (650) 444 2200 | GC, remodel, ADU | El Granada · San Mateo County | — | — |
| Calvey Heating & Air | Calvey Heating & Air | service@calveyhvac.com | (650) 910-6107 | HVAC | San Mateo · San Mateo County | — | — |
| Calvin Ng | Calvin Ng | — | (650) 678 4699 | GC, remodel, ADU | Hillsborough · San Mateo County | — | — |
| Calwest Builders INC | Robert Allen Johnston | calwestbuilders@aol.com | (818) 999-5200 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Camacho Tile | Camacho Tile | — | (650) 455 4114 | Other | San Mateo · San Mateo County | — | — |
| Camarina Construction Corporation | Carlo Jr Campobello | info@camarinaconstruction.com | (415) 867 7296 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Camex Electric & Builders | Miguel Angel Sanchez | — | (650) 207 7340 | Electricians | San Mateo · San Mateo County | — | — |
| Camino Carpets | Paul Soheil Nazarian | — | (650) 573 8001 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| Camp Curry Construction | Philomena Ann Terry | greg@gregterry.com | (650) 678 1110 | GC, remodel, ADU | Hillsborough · San Mateo County | — | — |
| Campagna Construction | Mark Taylor Campagna | — | (415) 756 7186 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Campi Construction | James Raymond Campi | — | (650) 280 9313 | GC, remodel, ADU | Foster City · San Mateo County | — | — |
| Campillo Builders INC | Jesse Jacob Campillo | jesse@campillobuilders.com | (650) 716 9943 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Campos Painting | Campos Painting | — | (415) 756 5619 | Windows, patio, painters | San Mateo · San Mateo County | — | — |
| Campos Painting | Campos Painting | — | (650) 952 9104 | Windows, patio, painters | South San Francisco · San Mateo County | — | — |
| Can Do Contractors | Colomba Adoracion Canas | — | (415) 725 1073 | GC, remodel, ADU | Moss Beach · San Mateo County | — | — |
| Can Do Flooring | Can Do Flooring | info@candoflooring.com | (407) 680-3269 | Other | San Carlos · San Mateo County | — | — |
| Candela Construction INC | Ahmad Hokmabadi | — | (650) 533 7372 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Canelo Flooring | Canelo Flooring | — | (415) 710 9337 | Other | Brisbane · San Mateo County | — | — |
| Cano Tree Service LLC | Guerra Isabel | — | (650) 400 8772 | Other | Redwood City · San Mateo County | — | — |
| Canyon Woodworks INC | Scott James Andrews | scott@canyonwoodworks.com | (650) 302 1548 | Other | Belmont · San Mateo County | — | — |
| Cap Painting | Cesar Augusto Palma | — | (650) 642 7278 | Windows, patio, painters | San Carlos · San Mateo County | — | — |
| Capati Construction Co | Virgilio David Capati | — | (650) 438 3060 | GC, remodel, ADU | Pacifica · San Mateo County | — | — |
| Capital Building Maintenance & Cleaning Services INC | Wesley Rodgers Iii Dean | — | (650) 588 9808 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Car Construction | Carlos Alberto Rueda | — | (650) 392 9173 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Carcasa Construction | Juan Carlos Serna Camacho | — | (650) 518 0231 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Caribbean Floors INC | Stefan Eugene Owens | — | (650) 369 8755 | Other | Redwood City · San Mateo County | — | — |
| Carl Durazzo Painting | Carl Durazzo Painting | — | (650) 504 6033 | Windows, patio, painters | Burlingame · San Mateo County | — | — |
| Carl O Noack | Carl O Noack | — | (650) 892 9294 | Electricians | San Mateo · San Mateo County | — | — |
| Carlin Construction | Carlin Sean | — | (415) 260 5199 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Carlos Lopez Construction INC DBA Bay Counties Construction And | Luis Carlos Lopez | — | (415) 271 3525 | Electricians | Daly City · San Mateo County | — | — |
| Carmel Kabash General Construction And Painting Contractor | Carmel Candice Kabash | — | (415) 368 8963 | GC, remodel, ADU | Brisbane · San Mateo County | — | — |
| Carney Refrigeration INC | Thomas Augustine Jr Carney | iceman.carney@icloud.com | (650) 697 8762 | HVAC | San Mateo · San Mateo County | — | — |