| Control Point Air | Ryan Thomas Vernali | ryan@controlpointair.com | (650) 242 2400 | HVAC | San Mateo · San Mateo County | — | — |
| Conway Construction And Consulting INC | Robert Andrew Conway | — | (650) 521 6811 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| Cooke & Mc Cann INC | Paul Thomas Mc Cann | — | (415) 987 0001 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Cooke Construction Services | William Camlin Cooke | — | (510) 815 1953 | Other | San Carlos · San Mateo County | — | — |
| Cool Tech Mechanical INC | Mark Anthony Zugar | — | (888) 471 8444 | HVAC | San Carlos · San Mateo County | — | — |
| Copeland Builders INC | David Brian Copeland | — | (650) 643 9625 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Copper Connections Electrical Contractor | William Troy Baldwin | — | (707) 326 4343 | Electricians | Daly City · San Mateo County | — | — |
| Coppergold Electric INC | Melvin Munoz Moran | — | (415) 720 9367 | Electricians | Daly City · San Mateo County | — | — |
| Copus Construction | Eric Preston Copus | — | (408) 966 5265 | GC, remodel, ADU | Belmont · San Mateo County | — | — |
| Core Communication INC | Nicholas Anthony Rozzi | hello@core-communication.com | (408) 591 4442 | Other | Redwood City · San Mateo County | — | — |
| Core Glass & Aluminum INC | Roger Chung Chow | — | (415) 851 9770 | Windows, patio, painters | South San Francisco · San Mateo County | — | — |
| Coregreen Construction INC | Kevin Albert Guibara | — | (650) 678 4859 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Corish Electric Residential Corporation | Derek Walter Kozacko | — | (415) 626 1885 | Electricians | Burlingame · San Mateo County | — | — |
| Cornerstone Builders | Octavio Lopez | — | (650) 722 4405 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Cornerstone Construction & Maintenance Corp | Chau Michael | — | (415) 999 5151 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Cornerstone Pro Builders INC | Rogelio Fabricio Soto | — | (650) 898 2375 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Cornerstonehd Construction INC | Benson Houngleung Fong | — | (650) 866 3222 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Cornett And Sons INC | David James Cornett | — | (415) 559 2922 | Electricians | San Bruno · San Mateo County | — | — |
| Corporate Park Landscaping INC | Roberto Valencia | — | (650) 631 0179 | Windows, patio, painters | San Carlos · San Mateo County | — | — |
| Corvane Construction Group INC | Tyrone Martin Medrano | info@corvaneconstructiongroup.com | (650) 417 4004 | GC, remodel, ADU | San Mateo · San Mateo County | — | — |
| Cosentino Plumbing & Backflow Services | Owen Angelo Cosentino | — | (650) 443 8069 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Costa Millworks Construction | Fernandes Wesley Augusto Ramos | — | (650) 509 0286 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Cottonaro Custom Homes | Cottonaro Custom Homes | — | (650) 817 5288 | GC, remodel, ADU | San Carlos · San Mateo County | — | — |
| Cougar Concrete Drilling Solutions LLC | Mendoza Crispin | — | (650) 465 7741 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| County Of San Mateo Planning And Building Department | County Of San Mateo Planning And Building Department | — | (650) 363-4161 | Inspectors | Redwood City · San Mateo County | — | — |
| County Restaurant Supply | Mark Edmond Krampert | — | (650) 591 8500 | Other | San Carlos · San Mateo County | — | — |
| Courtney Custom Construction INC | William Keith Jr Courtney | william@courtneycustomconstruction.com | (650) 398 5274 | GC, remodel, ADU | Daly City · San Mateo County | — | — |
| Covey Plumbing | Covey Plumbing | — | (650) 483 7151 | Other | San Mateo · San Mateo County | — | — |
| Cowboy's Construction | Luis Enrique Gonzalez Cruz | — | (650) 644 6551 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Cowboys Tree Service | Velazquez Gustavo | — | (650) 759 0767 | Tree | San Mateo · San Mateo County | — | — |
| Coya Design Build INC | Victor Alfonzo Martinez Rodriguez | — | (650) 745 5532 | GC, remodel, ADU | South San Francisco · San Mateo County | — | — |
| Coyle Masonry Incorporated | Michael Noel Coyle | — | (650) 270 7147 | Other | Redwood City · San Mateo County | — | — |
| Coyne Stair INC | Kevin Francis Coyne | laura@coynestair.com | (650) 969 1900 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| Cozzolino Industries INC | James Salvatore Cozzolino | — | (650) 726 0574 | Windows, patio, painters | Half Moon Bay · San Mateo County | — | — |
| Cp County Construction INC | Ri Tang Chen | — | (650) 627 6358 | GC, remodel, ADU | Millbrae · San Mateo County | — | — |
| Cp Mechanical | Chris Paul | office@cpmechanical.com | (650) 299 9070 | HVAC | San Mateo · San Mateo County | — | — |
| Cpb Construction Corporation | Manuel Erick Calvo-perez | — | (650) 438 2166 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |
| Cpr Plumbing | Cpr Plumbing | — | (650) 632 1500 | Other | San Carlos · San Mateo County | — | — |
| Craft Builders INC | Javier Molina Alvarez | — | (650) 595 5118 | Electricians | San Carlos · San Mateo County | — | — |
| Crafted By Timpano | Joel Carmelo Timpano | — | (650) 589 3996 | GC, remodel, ADU | San Bruno · San Mateo County | — | — |