| Chris Flynn Plumbing | Chris Flynn Plumbing | — | (707) 815 6636 | Other | Calistoga · Napa County | — | — |
| Chris Keller's Tree Service | Christopher Brooks Keller | — | (707) 319 8059 | Tree | Napa · Napa County | — | — |
| Chris Mollo Painting | Chris Mollo Painting | — | (707) 254 5876 | Windows, patio, painters | Napa · Napa County | — | — |
| Christman Electrical Contracting | Phillip Rudolph Iv Christman | info@christmanelectricalcontracting.com | (707) 332 2814 | Electricians | Napa · Napa County | — | — |
| Christopher Myers General Contracting | Christopher Ryan Myers | — | (619) 675 5439 | GC, remodel, ADU | St Helena · Napa County | — | — |
| Cisco's Landscaping | Cisco's Landscaping | — | (707) 738 1129 | GC, remodel, ADU | Napa · Napa County | — | — |
| Citybest Construction INC | Georgiy Kulya | info@citybestconstruction.com | (415) 850 3512 | GC, remodel, ADU | Calistoga · Napa County | — | — |
| Ck Electrical INC | Charles Waylon Kuhn | — | (707) 227 5683 | Electricians | Napa · Napa County | — | — |
| Clayton Plumbing Services | Eric Anthony Clayton | — | (707) 738 4986 | Other | American Canyon · Napa County | — | — |
| Clerici And Son's Construction | Sam Joseph Clerici | — | (707) 486 9452 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| Clerici Construction INC | Sam Carlo Clerici | — | (707) 246 8387 | Electricians | American Canyon · Napa County | — | — |
| Clyde E Trego Jr | Clyde E Trego Jr | — | (707) 479 5304 | GC, remodel, ADU | Napa · Napa County | — | — |
| Cm Heating And Air | Cm Heating And Air | — | (707) 699 5219 | HVAC | Napa · Napa County | — | — |
| Cmp Building Group | Chris Michael Pollastrini | — | (707) 592 3700 | GC, remodel, ADU | Napa · Napa County | — | — |
| Cmv Painting INC | Melgoza Villa Cesar | — | (707) 346 1897 | Windows, patio, painters | Napa · Napa County | — | — |
| Co Renovations | Christian Alejandro Osuna Sandoval | — | (818) 795 0930 | GC, remodel, ADU | Napa · Napa County | — | — |
| Code 3 Electric INC | Jayson Andrew Uribe | — | (707) 249 8933 | Electricians | Angwin · Napa County | — | — |
| Comprehensive Painting | Comprehensive Painting | — | (707) 322 5259 | Windows, patio, painters | Napa · Napa County | — | — |
| Connor And Sons Concrete INC | Paul Vincent Connor | — | (707) 312 1577 | Other | Napa · Napa County | — | — |
| Conti Construction | Dean Wayne Conti | — | (707) 328 5821 | GC, remodel, ADU | Napa · Napa County | — | — |
| Contractor Services & Associates | John Michael Snyder | — | (707) 253 8199 | Other roofers | Napa · Napa County | — | — |
| Copper Iron Designs INC | Andrew John Bradford | — | (707) 249 2728 | Other | Napa · Napa County | — | — |
| Corey W Dyer | Corey W Dyer | — | (707) 254 5544 | Windows, patio, painters | Napa · Napa County | — | — |
| Corona Seal And Stripe | Corona Seal And Stripe | — | (707) 815 1743 | Other | Napa · Napa County | — | — |
| Cortes Electric | Cortes Gonzalez Antonio | — | (707) 210 7225 | Electricians | Napa · Napa County | — | — |
| Cottonwood Homes INC | Christian John Kreer | — | (707) 258 0974 | GC, remodel, ADU | Napa · Napa County | — | — |
| Courtney Construction | Daniel Bernard Courtney | — | (707) 253 0254 | GC, remodel, ADU | Napa · Napa County | — | — |
| Cowan Roofing | James Lloyd Sr Cowan | jim@cowanroofinginc.com | (707) 333 4660 | Other roofers | American Canyon · Napa County | — | — |
| Cowboy Construction | Jon David Nelson | — | (707) 738 2318 | GC, remodel, ADU | Napa · Napa County | — | — |
| Craftsman Building Co | James Edward Cheney | — | (907) 244 9986 | GC, remodel, ADU | Napa · Napa County | — | — |
| Craig C Walker | Craig C Walker | — | (707) 738 6618 | GC, remodel, ADU | Napa · Napa County | — | — |
| Creative Construction Company | Adam Kenneth Welsh | — | (707) 257 7982 | GC, remodel, ADU | Napa · Napa County | — | — |
| Cross Valley Construction | Robert Thurston Tillinghast | — | (707) 494 3811 | Electricians | Napa · Napa County | — | — |
| Crown Landscape Contractors INC | Aman Preet Singh | crownrfp@gmail.com | (707) 704 6273 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| Crown Remodeling | Crown Remodeling | — | (707) 815 7493 | GC, remodel, ADU | Napa · Napa County | — | — |
| Cruz Painting | Cruz Painting | — | (707) 299 0933 | Windows, patio, painters | Napa · Napa County | — | — |
| Crystal Clear Pool & Spa Service | Hijar Oscar | — | (707) 252 8255 | Pool | Napa · Napa County | — | — |
| Csa Contracting | Cory Scott Amarant | estimates@csacontracting.com | (530) 796 6050 | GC, remodel, ADU | Napa · Napa County | — | — |
| Curtis Cole Custom Hardwood Flooring INC | Curtis Edward Cole | — | (707) 337 6662 | Other | Napa · Napa County | — | — |
| Curtis Shaw Construction INC | Curtis Matthew Shaw | contact@sansoxygen.com | (707) 312 0569 | GC, remodel, ADU | Napa · Napa County | — | — |