| Collier Building Specialties INC | Charles Alan Kennedy | — | (415) 467 9235 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Collier Warehouse INC | Christy Lynn Akin | — | (415) 920 9720 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Collins Construction INC | Brendan Michael Collins | — | (415) 309 7362 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Colonial Ornamental Iron Works INC | Alfonso Gomez Picazo | — | (415) 822 2920 | Other | San Francisco · San Francisco County | — | — |
| Colores Painting Co INC The | Hugo Noel Ruiz | benjaminz@colorespainting.com | (415) 235 3155 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Colorfast Painting Company | Genevieve Rampley Ryan | — | (415) 672 8501 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Com1 Communications | Alan Wayne Merritt | — | (415) 845 7018 | Other | San Francisco · San Francisco County | — | — |
| Commercial Audio Video Solutions INC | Donald Patrick Lynch | — | (408) 425 9331 | Other | San Francisco · San Francisco County | — | — |
| Commercial Interior Builders INC | James Naylor Bruntz | — | (415) 896 1102 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Commins Construction Co | Noel Wyndham Commins | — | (415) 867 7268 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Competente Construction | David Soriano Competente | — | (415) 794 8258 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Complete Fabrications INC | Ryan Michael Drake | — | (415) 822 3522 | Other | San Francisco · San Francisco County | — | — |
| Complete Security INC | Paul Frederic Gommel | — | (415) 543 1660 | Alarm and generators | San Francisco · San Francisco County | — | — |
| Concept Design And Build INC | Larry Dean Curtis | — | (415) 888 9612 | Electricians | San Francisco · San Francisco County | — | — |
| Conklin Bros INC | Kenneth Allen Conroy | — | (415) 282 1822 | Other | San Francisco · San Francisco County | — | — |
| Conor Forde Painting | Conor Patrick Forde | conor@conorfordepainting.com | (415) 377 0010 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Conor Ward DBA Materialist | Conor Ward DBA Materialist | — | (415) 710 7891 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Conquer Roofing | Abdul Nation Gassama | — | (650) 921 6876 | Other roofers | San Francisco · San Francisco County | — | — |
| Constantine Construction | Eugene Constantine Polos | — | (415) 613 3734 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Constructa INC | Gianluca Baldo | — | (415) 550 8288 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Construction Framework Company | Ilya Zhuchkov | — | (415) 612 0983 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Construction Guys INC | Koon Kit Woo | service@constructionguys.com | (415) 860 6888 | Electricians | San Francisco · San Francisco County | — | — |
| Construction Services Industries | Debbie Morales Ghadiri | — | (415) 407 7805 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Construction Studios INC | Joy Ou | — | (415) 394 9017 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Construction Systems Building & Design | Wilfred Owen Hall | — | (415) 756 6987 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Continuum Tile Company | Menapace Daniel | info@continuumtile.com | (415) 452 4270 | Other | San Francisco · San Francisco County | — | — |
| Cookline Construction INC | Levi Shenandoah Hunt | — | (415) 857 4729 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Coolrite Refrigeration INC | Manuel Vartan Nazerian | — | (415) 640 7951 | HVAC | San Francisco · San Francisco County | — | — |
| Cooptek | Jimmie Christopher Cooper | — | (650) 755 4500 | Other | San Francisco · San Francisco County | — | — |
| Cooritalia INC | Francesca Alessio De | info@cooritalia.com | (415) 339 5810 | Other | San Francisco · San Francisco County | — | — |
| Corcus Construction INC | Thomas Patrick Breen | info@corcusconstruction.com | (415) 423 4603 | Other | San Francisco · San Francisco County | — | — |
| Corinthian Decorative Finishes | Corinthian Decorative Finishes | — | (415) 923 0500 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Corish Commercial Electric INC | Ross Jon Halligan | — | (650) 537 0944 | Electricians | San Francisco · San Francisco County | — | — |
| Cork Corporation | Cornelius Patrick Lyons | — | (415) 254 3180 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Corkcon LLC | Barry Pena O Mahony | — | (628) 294 4236 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cormican Plastering INC | Domnick Martin Cormican | — | (415) 760 1600 | Other | San Francisco · San Francisco County | — | — |
| Cornelius Enterprise | Cornelius Enterprise | — | (415) 596 8278 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Cornely Company | John James Gray | — | (415) 252 1800 | HVAC | San Francisco · San Francisco County | — | — |
| Cornerstone Construction | Shane Thomas O'reilly | gwebb@cornerstone-construction.com | (832) 259-2520 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Corona Remodeling INC | Corona Alejandro | — | (415) 867 7559 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |