| Coastline Current LLC | Vincent Joseph Cerruti | — | (415) 246 2882 | Electricians | Novato · Marin County | — | — |
| Coffey Landscape | Coffey Landscape | — | (415) 246 6976 | Windows, patio, painters | Fairfax · Marin County | — | — |
| Coleman Electric | Paul Bernard Coleman | — | (415) 218 1557 | Electricians | Fairfax · Marin County | — | — |
| Colindres & Associates | Ronald Robert Colindres | — | (415) 448 5390 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Colleen King Painting | Colleen King Painting | — | (415) 663 8225 | Windows, patio, painters | Pt Reyes Station · Marin County | — | — |
| Colli Painting | Colli Painting | — | (415) 606 7173 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Colli Painting | Colli Painting | — | (415) 717 3119 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Color Solutions Painting | Color Solutions Painting | — | (415) 488 3683 | Windows, patio, painters | Novato · Marin County | — | — |
| Colorvie Painting INC | Pedro Wilb Hernandez Gonzalez | — | (415) 847 1334 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Comari | Marcia Xavier May | — | (415) 571 6619 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Commericial Electrical Services | Chalmer Daniel Tolson | — | (415) 250 4269 | Electricians | Woodacre · Marin County | — | — |
| Concept2completion | Kambiz Faradji Shadan | — | (415) 760 0346 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Condor Construction INC | Steven William Hansen | — | (415) 497 5862 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Conley Electric And Remodel | Bryan Lee Conley | — | (415) 717 8245 | Electricians | Novato · Marin County | — | — |
| Connacht Construction | Liam Gerard Headd | — | (415) 999 7569 | GC, remodel, ADU | Novato · Marin County | — | — |
| Connor Daly Corporation | Connor Daniel Daly | — | (415) 294 1804 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Conrad Carl Weissensee Jr | Conrad Carl Weissensee Jr | — | (415) 271 1074 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Conservation Corps North Bay INC | Megan Christine Meder | — | (707) 303 3069 | Windows, patio, painters | Novato · Marin County | — | — |
| Consolidated Construction INC | Clifford Edward Bolton | — | (415) 456 9100 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Construbay | Paulo R Fernandes | paulo@construbay.com | (415) 968 9494 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Constructs | Hayden Kirk Hicks | — | (415) 272 2832 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Continuum Construction | Robert Thomas Iv Newell | jerry@continuumco.com | (415) 513 7790 | GC, remodel, ADU | Novato · Marin County | — | — |
| Cook General Contractor INC | Gregory John Cook | — | (415) 418 0448 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Copper Beech | Copper Beech | info@copperbeech.com | (415) 329 6059 | Electricians | San Quentin · Marin County | — | — |
| Coral Colours INC | Alon Cohen | — | (415) 450 0199 | Other | Novato · Marin County | — | — |
| Corby E Lawton | Corby E Lawton | — | (415) 948 5543 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Coronado Painting | Coronado Painting | — | (415) 595 1399 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Corporate Media Systems INC | Ann Dannecker | — | (415) 457 9550 | Other | San Rafael · Marin County | — | — |
| Cortegana Flooring | Cortegana Flooring | — | (415) 233 1927 | Other | San Rafael · Marin County | — | — |
| Countner Construction | William Slade Countner | — | (206) 949 0422 | GC, remodel, ADU | Novato · Marin County | — | — |
| Couture Architecture A Professional Corporation | Scott Daniel Couture | — | (415) 482 0224 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Crafted Earth INC | Eric Macdonald Spletzer | — | (415) 699 9662 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Craftsman Concepts LLC | Michael James Dominguez | — | (415) 328 3566 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Craig Arant Design Build | Craig Arant Design Build | — | (415) 497 6560 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Craig Jensen | Craig Jensen | — | (415) 507 1893 | Windows, patio, painters | Novato · Marin County | — | — |
| Crane Pest Control | Crane Pest Control | servicemanager@cranepestcontrol.com | (415) 922-1666 | Pest, tile roofs | San Rafael · Marin County | — | — |
| Creative Builders | Creative Builders | — | (415) 720 5690 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Creative Concrete Design | Creative Concrete Design | — | (415) 806 7002 | Other | Novato · Marin County | — | — |
| Creative Habitat Designs | Creative Habitat Designs | — | (415) 806 9246 | GC, remodel, ADU | Novato · Marin County | — | — |
| Creative Wood Works | Creative Wood Works | interested@domainmarket.com | (415) 847 1835 | GC, remodel, ADU | Sausalito · Marin County | — | — |