| City Trees | City Trees | — | (415) 626-8535 | Tree | San Francisco · San Francisco County | — | — |
| City Wide Insulation Company INC | Paul Anthony O'connor | — | (415) 652 0260 | Other | San Francisco · San Francisco County | — | — |
| Citywest Construction INC | Neeson Thomas | — | (415) 279 8860 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cj Plumbing INC | Zhicheng Chow | — | (415) 254 6213 | Other | San Francisco · San Francisco County | — | — |
| Cl Construction LLC | Ruiqiu Guan | — | (415) 825 2067 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Claddagh Construction | Carey Catriona | — | (415) 518 1360 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Claddagh Refrigeration Company INC | John Anthony Coyne | — | (415) 643 9248 | HVAC | San Francisco · San Francisco County | — | — |
| Claremont Homes INC | Michael William Conley | — | (903) 922 6279 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Clarks Painting Company | Clark Kenneth Mariotti | info@clarkspainting.com | (415) 244 4467 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Classic Shades Painting Company INC | Yefim Skomorovsky | — | (415) 566 4910 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Clay Hill Construction | Vincent Gerard Cosgrove | — | (415) 987 3736 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Clayton Hubbard Painting | Clayton Hubbard Painting | — | (415) 552 9866 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Clayton Timbrell & Co | Clayton Carey Timbrell | — | (415) 660 5604 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Clayton Woodworks INC | Jeffrey Scott Gaffney | info@claytonwoodworks.com | (415) 377 5418 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Clear Windows And Clear Doors INC | Freddy Kam Hing Leung | — | (415) 468 1300 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Clearheart | William Charles Jones | — | (415) 571 5338 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Clever Heating And Cooling | Chong Hun Park | — | (415) 385 8224 | HVAC | San Francisco · San Francisco County | — | — |
| Clew Bay Construction | Enda Paul Moore | — | (415) 216 7048 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cliff Point Construction INC | Anthony Joseph Reid | — | (415) 422 1687 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Climbing Construction INC | Ryan Tadashi Honda | — | (408) 859 9446 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Clipper Construction INC | Allan Mathieu Palmer | — | (415) 621 4733 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cluain Meala Plumbing | Cluain Meala Plumbing | — | (415) 886 5365 | Other | San Francisco · San Francisco County | — | — |
| Clw Builders INC | David Wei Xiong Liang | — | (415) 333 9788 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cma Development INC | Ma Charles | charles@cma-development.com | (917) 837 0015 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cmc Professional Paperhangers | Cmc Professional Paperhangers | — | (415) 860 5554 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cmc Traffic Control Specialists LLC | Brandon Earl Lovell | — | (415) 206 1700 | Other | San Francisco · San Francisco County | — | — |
| Cmd Low Voltage | Cmd Low Voltage | — | (415) 571 1875 | Other | San Francisco · San Francisco County | — | — |
| Coast To Coast Drywall Co | Vernon Clarence Washington | — | (415) 525 0300 | Other | San Francisco · San Francisco County | — | — |
| Coastal Side Builders INC | Roger Moore | — | (415) 646 6349 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Coastal Tile & Construction INC | Rostyslav Poberezhny | — | (415) 845 7262 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Coastside Communications INC | Mallozzi Gregory | — | (415) 885 1440 | Electricians | San Francisco · San Francisco County | — | — |
| Coastside Painting And Decorating | Coastside Painting And Decorating | — | (415) 307 6914 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Cobble & Forge INC | Joshua Thomas Mead | — | (415) 725 0973 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Coca Painting | Coca Painting | — | (415) 866 4864 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Cody Design Build INC | David Michael Cody | info@codydesignbuild.com | (415) 260 6570 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cogent Construction & Consulting INC | Santre Chi Li | — | (415) 850 2930 | Electricians | San Francisco · San Francisco County | — | — |
| Cogent LLC | Santre Chi Li | — | (415) 987 2032 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Coil INC | Penn Bobby | — | (415) 941 6802 | Electricians | San Francisco · San Francisco County | — | — |
| Coit Construction INC | James Joseph Lee | — | (415) 640 4808 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cole's Construction | Jesse Emerson Fowler | — | (415) 251 6000 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |