| Canepa Landscaping INC | Chad Rossman Canepa | info@canepalandscaping.com | (707) 322 7007 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Canopy Arborists | Rosas Edgar Guerrero | — | (707) 888-4635 | Other | Santa Rosa · Sonoma County | — | — |
| Canyon Craftsman | Canyon Craftsman | — | (650) 438 2040 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Canyon Rock Co INC | Jonathon Wayne Trappe | — | (707) 887 2207 | Other | Forestville · Sonoma County | — | — |
| Capital Drywall | Capital Drywall | — | (415) 606 2367 | Other | Rohnert Park · Sonoma County | — | — |
| Capri Construction & Coating INC | Seth Vincent Capri | — | (707) 591 1476 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Capstone Roofing INC | William Silva Defaria | info@capstoneroofing.biz | (707) 575 3577 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Captain Construction | Gregory David Altman | — | (415) 879 5708 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Captain Wallpaper | Captain Wallpaper | chat@captainwallpaper.com | (707) 908-5623 | Other | Cloverdale · Sonoma County | — | — |
| Captain Wallpaper INC | Oleksandr Bezhenar | chat@captainwallpaper.com | (707) 908-5623 | Other | Rohnert Park · Sonoma County | — | — |
| Caratti Construction | Vincent Sam Caratti | — | (707) 483 9554 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Carbajal Carpentry INC | Javier Carbajal | — | (707) 338 5818 | Other | Petaluma · Sonoma County | — | — |
| Cardinal Electric | Craig Bentley Clark | — | (707) 490 6719 | Electricians | Rohnert Park · Sonoma County | — | — |
| Carey Electrical | Paul Anthony Carey | — | (707) 765 4546 | Electricians | Petaluma · Sonoma County | — | — |
| Carillo's Construction | Carrillo Avina Edwin | — | (707) 933 6463 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Carl Blomgren | Carl Blomgren | — | (415) 609 1274 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Carl Jordan Construction | Carl Lester Jordan | — | (415) 717 7526 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Carl L Burchfiel General Contracting | Carl Lee Burchfiel | — | (707) 526 1300 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Carl Quinten Painting & Coatings | Carl Quinten Painting & Coatings | — | (707) 623 2401 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Carm's Custom Concrete & Overlay | Carm's Custom Concrete & Overlay | — | (707) 431 0829 | Other | Santa Rosa · Sonoma County | — | — |
| Carpenter & Son's Building INC | Jonathan Alan Carpenter | — | (707) 479 7638 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Carpet Center | Richard Leland Eyestone | interested@domainmarket.com | (707) 239 8420 | Other | Healdsburg · Sonoma County | — | — |
| Carr's Construction Service INC | Christopher George Sr Carr | info@carrsconstructionservice.com | (707) 539 8650 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Carrillo's Painting INC | Jose Martin Carrillo | — | (707) 696 5761 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Carrington Construction INC | Troy Lee Roatch | — | (707) 478 2734 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Carrino Construction INC | Mark Francis Carrino | — | (707) 529 3803 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Carroll Mechanical Systems | Carroll Mechanical Systems | — | (925) 405 2612 | HVAC | Penngrove · Sonoma County | — | — |
| Carson Manufacturing Company | Curtis Vernon Lang | — | (707) 795 3141 | Other | Cotati · Sonoma County | — | — |
| Carter Carpet Exchange INC | Vince Lee Carter | — | (707) 396 3851 | Other | Santa Rosa · Sonoma County | — | — |
| Cartwright Builders INC | James Allen Cartwright | — | (707) 477 5228 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Carvelho Electric | James Kenneth Carvelho | — | (707) 326 6140 | Electricians | Santa Rosa · Sonoma County | — | — |
| Cary & Associates Builders INC | Corey Todd Cleland | — | (707) 829 8589 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Casadidio Construction | Anthony Alfred Casadidio | — | (707) 823 1727 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Casari Ranch LLC | Casey Martin Mazzucchi | ariana@casariranch.com | (707) 338 9817 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Cascada Landscape | Mendoza Roberto Lomeli | — | (707) 332 5787 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Cascade-plumbingsolutions LLC | Dustin Jerome Sanders | dusty@cascade-plumbingsolutions.com | (415) 757 8748 | Other | Rohnert Park · Sonoma County | — | — |
| Case Electrical Construction | Scott Case Belland | — | (707) 484 7120 | Electricians | Santa Rosa · Sonoma County | — | — |
| Case H Meints Construction | Case Henry Meints | — | (707) 235 5387 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Caspersen Excavating | Caspersen Excavating | — | (707) 486 0921 | Other | Healdsburg · Sonoma County | — | — |
| Castaneda Grading & Excavating | Humberto Wilfre Madrigal Castaneda | — | (707) 623 3386 | Other | Santa Rosa · Sonoma County | — | — |