| Cal - Bay Roofing INC | Luis Enrique Simental Santamaria | — | (415) 909 9461 | Other roofers | San Francisco · San Francisco County | — | — |
| Cal - C A D E Construction INC | James Gallagher | — | (415) 206 0550 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cal Am Construction INC | David Chang | — | (855) 588 5885 | Electricians | San Francisco · San Francisco County | — | — |
| Cal Bay Stone & Tile LLC | Ching Hsiu Chen | — | (646) 515 1000 | Other | San Francisco · San Francisco County | — | — |
| Cal Builder INC | Da Qiang Tan | — | (415) 812 9800 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cal Construction | Gomez Joel | — | (415) 595 1198 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cal Landmark Electric And Construction INC | Liqiang Wen | — | (415) 308 1558 | Electricians | San Francisco · San Francisco County | — | — |
| Cal State Constructors INC | Alan Ko | — | (415) 536 9388 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cal-pac Painting INC | Rush Paul | — | (415) 239 6984 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Caledonia Plastering & Stucco INC | John Martin Cullen | — | (415) 685 9910 | Other | San Francisco · San Francisco County | — | — |
| Cali Roofing & Home Improvements | Cali Roofing & Home Improvements | — | (415) 955-7953 | Other roofers | San Francisco · San Francisco County | — | — |
| Califo Electric INC | Nigel Anthony Mulligan | — | (415) 410 8570 | Electricians | San Francisco · San Francisco County | — | — |
| California Academy Of Sciences | Daniel John Langlands | info@calacademy.org | (415) 845 5485 | Electricians | San Francisco · San Francisco County | — | — |
| California Climate Action Now! Ecological Landscapes | Mark Thomas Major | — | (415) 503 7639 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| California Concepts Construction | Wendell Roger Foster | — | (415) 385 3935 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| California Development & Renovation | Marcus Francis Newbury | — | (415) 974 1234 | Other roofers | San Francisco · San Francisco County | — | — |
| California Energy Solutions | Steven Richard Mc Kee | — | (415) 825 5461 | Electricians | San Francisco · San Francisco County | — | — |
| California Epoxy Flooring INC | Garret Andrew Torgerson | — | (415) 572 8059 | Other | San Francisco · San Francisco County | — | — |
| California Glass House INC | Kharyad Ornin | — | (415) 802 9422 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| California Healthy Home Inspections & Remediation Inc. | California Healthy Home Inspections & Remediation Inc. | — | (415) 828-4700 | Inspectors | Burlingame · San Francisco County | — | — |
| California Home Improvement Solutions INC | Shneyer Lev | — | (408) 590 3030 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| California Painting & Decorating | California Painting & Decorating | — | (415) 441 3416 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| California Shower Door Corporation | Marcos Canizales | — | (415) 822 1511 | Other | San Francisco · San Francisco County | — | — |
| California Structural Builders | California Structural Builders | — | (415) 990 6285 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| California Thermal Windows | California Thermal Windows | — | (415) 661 9140 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| California Woodworking Company | Munson You-Ming Louie | info@calwoodinc.com | (650) 872 7155 | Other | San Francisco · San Francisco County | — | — |
| Calplumbing Co | Michael Ambrose Barbieri | — | (415) 221 4633 | Other | San Francisco · San Francisco County | — | — |
| Calstone Counter Tops INC | Castorena Felipe Angeles | — | (415) 716 9359 | Other | San Francisco · San Francisco County | — | — |
| Camber Operating Company LLC | Matthew Michael Voorheis | — | (510) 406 4875 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cameron Home Builders | Graham John Moore | info@cameronhomebuilders.com | (415) 317 1514 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Campbell Painting | Campbell Painting | info@campbellpainting.com | (415) 994 3327 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Campione Construction | Patrick Charles Campione | — | (415) 722 6486 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Campobello Construction Company | Carlo Jr Campobello | — | (415) 867 7296 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Candido Electric Co | John Joseph Jr Candido | — | (415) 999 0440 | Electricians | San Francisco · San Francisco County | — | — |
| Canning Electric INC | Seamus Martin Canning | — | (415) 753 9335 | Electricians | San Francisco · San Francisco County | — | — |
| Canseco Construction Corp | Edgardo Javier Diaz Reyes | build@cansecoconstruction.com | (239) 285 2290 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Capitol Communications INC | Ronald James Burgess | — | (415) 861 2900 | Electricians | San Francisco · San Francisco County | — | — |
| Capitol Electric Construction Company | Patricia Marie Poggetti | — | (415) 861 2900 | Electricians | San Francisco · San Francisco County | — | — |
| Capomastro Group A California Corporation | Robert Joseph Lewis | — | (415) 801 5482 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Caponio & Son's | Caponio & Son's | — | (650) 342 4354 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |