| C & J Painting | Chris Kountouris | — | (707) 226 5510 | Windows, patio, painters | Napa · Napa County | — | — |
| C & M Management INC DBA Bluestone Pool & Landscape | Michael Scott Willard | — | (707) 224 2412 | Windows, patio, painters | Napa · Napa County | — | — |
| C J Construction | Colby Garrett Jennings | — | (707) 257 0864 | GC, remodel, ADU | Napa · Napa County | — | — |
| C L Kretschmann Designer/builder | C L Kretschmann Designer/builder | — | (415) 328 5600 | GC, remodel, ADU | Napa · Napa County | — | — |
| C R Briskovich Design / Build | Chad Ryan Briskovich | — | (415) 595 6225 | GC, remodel, ADU | Napa · Napa County | — | — |
| C R Buildworks INC | Julian Christopher Webster | — | (707) 812 6188 | GC, remodel, ADU | Napa · Napa County | — | — |
| C R North Bay INC | Jose Reynaldo Davila | — | (707) 553 7860 | GC, remodel, ADU | Napa · Napa County | — | — |
| C S Development INC | Charles Francis Skinner | — | (707) 815 0713 | GC, remodel, ADU | Napa · Napa County | — | — |
| C&j Pacific Construction LLC | Christoforos Dimitrios Kountouris | — | (707) 812 8203 | GC, remodel, ADU | Napa · Napa County | — | — |
| Caddell Nova A Joint Venture | Group INC Nova | — | (707) 265 1122 | Electricians | Napa · Napa County | — | — |
| Caires Painting | Caires Painting | — | (707) 363 2035 | Windows, patio, painters | Napa · Napa County | — | — |
| Caliber Roofing | Brad Robert Semmens | — | (707) 592 5415 | Other roofers | Napa · Napa County | — | — |
| California Stonecraft | California Stonecraft | info@californiastonecraft.com | (707) 252 4496 | Other | Napa · Napa County | — | — |
| Calixto General Engineering | Cordoba Rodrigo Calixto | — | (707) 235 3036 | Other | Yountville · Napa County | — | — |
| Call My Guy Construction Services | Stephan Louis Butler | — | (707) 337 3122 | GC, remodel, ADU | Napa · Napa County | — | — |
| Cameron Electric | Zachary Alan Cameron | — | (707) 666 2257 | Electricians | Napa · Napa County | — | — |
| Carey Development LLC | Brent Herbert Mart Hebb | — | (707) 656 9609 | GC, remodel, ADU | Napa · Napa County | — | — |
| Carl Frederick Shellhorn DBA Carl's Welding & Repair Service | Carl Frederick Shellhorn | — | (707) 695 9722 | Other | Napa · Napa County | — | — |
| Carlson Construction And Painting | Robert Ivar Jr Carlson | — | (707) 257 2030 | GC, remodel, ADU | Napa · Napa County | — | — |
| Carmichael Construction | David William Carmichael | — | (707) 480 8380 | GC, remodel, ADU | Napa · Napa County | — | — |
| Carmichael Construction | David William Carmichael | — | (704) 480 2447 | GC, remodel, ADU | Napa · Napa County | — | — |
| Carpet Creations | Carpet Creations | info@carpet-creations.com | (707) 888 1929 | Other | Napa · Napa County | — | — |
| Carpet One | Mark Allen Eatmon | — | (707) 462 1554 | GC, remodel, ADU | Napa · Napa County | — | — |
| Carreiro Homes Designers Builders | Carreiro Homes Designers Builders | — | (707) 321 7797 | GC, remodel, ADU | Calistoga · Napa County | — | — |
| Carston's Interiors INC A California Corporation | Scott Fredrick Carston | — | (707) 224 6994 | Other | Napa · Napa County | — | — |
| Carter Air Balance Co | David Matthew Galli | — | (707) 252 4859 | Other | Napa · Napa County | — | — |
| Carter's Construction | Carter Bentley Franklin | — | (707) 529 9708 | GC, remodel, ADU | Napa · Napa County | — | — |
| Casa Nueva Construction Services | Pena Melgoza Jorge | — | (619) 735 4073 | GC, remodel, ADU | Napa · Napa County | — | — |
| Cazbilt | Craig Denys Cazet | — | (707) 591 3227 | GC, remodel, ADU | St Helena · Napa County | — | — |
| Cedar Tree Care INC | Juan Carlos Garibay Quintero | — | (415) 726 8422 | Tree | Napa · Napa County | — | — |
| Ceg Low Voltage | Jorge Ariel Zetina | — | (707) 257 9701 | Other | Napa · Napa County | — | — |
| Cello & Maudru Construction Company INC | Michael Taylor Cello | — | (707) 257 0454 | GC, remodel, ADU | Napa · Napa County | — | — |
| Centric Building INC | Timothy Carl Mc Donald | info@centricgc.com | (415) 983 9520 | GC, remodel, ADU | St Helena · Napa County | — | — |
| Cesar's Landscaping Services LLC | Cesar Alberto Ortiz Montano | — | (707) 812 9432 | Windows, patio, painters | American Canyon · Napa County | — | — |
| Cggs Backhoe Service INC | Brian Allan Van Lehn | — | (209) 321 6331 | Other | Napa · Napa County | — | — |
| Chandler Construction Co | Voldi Louis Chandler | — | (707) 815 2318 | GC, remodel, ADU | Napa · Napa County | — | — |
| Chapman & Sons Painting | Chapman & Sons Painting | — | (707) 291 1575 | Windows, patio, painters | Napa · Napa County | — | — |
| Charles A Ruffner Painting | Charles A Ruffner Painting | — | (707) 738 0755 | Windows, patio, painters | Napa · Napa County | — | — |
| Chisto Construction LLC | Robert Raymond Taft | — | (707) 398 7371 | GC, remodel, ADU | Napa · Napa County | — | — |
| Chris Christensen | Chris Christensen | — | (707) 738 9546 | GC, remodel, ADU | Napa · Napa County | — | — |