| C C F G Construction | Michael John Niven | — | (209) 743 4911 | Electricians | Sonora · Tuolumne County | — | — |
| C E O Construction | Christopher Edward Oakes | — | (209) 588 8753 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| C S Welding & Fabrication INC | Colton Hayden Smith | — | (209) 770 6275 | Other | Tuolumne · Tuolumne County | — | — |
| Cal Gold Construction Corporation | Mark Twain Patterson | info@calgoldconstruction.com | (209) 533 3333 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Caldera Construction | Caldera Construction | — | (209) 533-2188 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| California Comfort | California Comfort | californiacomfortair@gmail.com | (209) 532 3378 | HVAC | Sonora · Tuolumne County | — | — |
| California Gold Development Corporation | Steven Bradford Campbell | — | (209) 533 3333 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| California Pacific Construction | Jeffrey Donald Davis | — | (209) 588 6572 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| California Reforestation INC | William Earl Dorrell | mail@calreforest.com | (209) 586 2115 | Tree | Sonora · Tuolumne County | — | — |
| Calvin Building | Calvin Building | — | (209) 770 0027 | GC, remodel, ADU | Mi-wuk Village · Tuolumne County | — | — |
| Camelot Land Development Corporation DBA Quality First | Donald Clark Parscal | — | (209) 770 6310 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Canaday Enterprises INC | William Brice Canaday | — | (209) 533 5005 | Pool | Soulsbyville · Tuolumne County | — | — |
| Canepa And Sons INC | Roger Byron Canepa | — | (209) 532 1136 | Other | Sonora · Tuolumne County | — | — |
| Capito Constructs INC | Joseph Richard Doug Capito | — | (435) 414 3020 | GC, remodel, ADU | Tuolumne · Tuolumne County | — | — |
| Carefree Pool Service INC | Matthew Stephen Huff | interested@domainmarket.com | (209) 728 5279 | Pool | Jamestown · Tuolumne County | — | — |
| Carl S Eslinger | Carl S Eslinger | — | (209) 743 8584 | Other | Jamestown · Tuolumne County | — | — |
| Carter Roofing INC | Thomas Scott Carter | — | (209) 984 4212 | Other roofers | Jamestown · Tuolumne County | — | — |
| Caveman Creations Construction | Patrick Morgan Rapp | — | (209) 402 6665 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Ccfg Electric | Michael John Niven | — | (209) 743 4911 | Electricians | Sonora · Tuolumne County | — | — |
| Central | Jeffrey Harry Sargo | — | (209) 532 7132 | Other roofers | Sonora · Tuolumne County | — | — |
| Century 21 Sierra Properties Sonora | Century 21 Sierra Properties Sonora | — | (209) 540-9391 | Property managers | Sonora · Tuolumne County | — | — |
| Chapman's Building & Assistance | Chapman's Building & Assistance | — | (209) 962 0663 | GC, remodel, ADU | Big Oak Flat · Tuolumne County | — | — |
| Chappell's Plumbing | Chappell's Plumbing | — | (209) 352 8060 | Other | Sonora · Tuolumne County | — | — |
| Chris Mac Donald Painting | Chris Mac Donald Painting | — | (209) 770 0278 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Chris Simpson Painting | Chris Simpson Painting | — | (209) 532 0784 | Windows, patio, painters | Sonora · Tuolumne County | — | — |
| Christopher Lee Cullen DBA C L C Construction | Christopher Lee Cullen | — | (831) 601 0198 | Electricians | Groveland · Tuolumne County | — | — |
| Citadel Construction | John Richard Vass | — | (209) 454 7777 | GC, remodel, ADU | Sonora · Tuolumne County | — | — |
| Cj Construction | Robert Eldon Campbell | — | (209) 662 3345 | GC, remodel, ADU | Soulsbyville · Tuolumne County | — | — |
| Clarence Davis Stucco | Clarence Davis Stucco | — | (510) 549 9911 | Other | Twain Harte · Tuolumne County | — | — |
| Clayton Rosasco | Clayton Rosasco | — | (209) 532 3571 | Other | Sonora · Tuolumne County | — | — |
| Clink Electric | Darren Michael Eaton | clinkelectric@gmail.com | (209) 532 7743 | Electricians | Jamestown · Tuolumne County | — | — |
| Cmr Plumbing & Drain | Christopher Martin Rangel | — | (209) 768 9151 | Other | Sonora · Tuolumne County | — | — |
| Columbia Concrete Pumping & Supply INC | Michael Donovan Skuce | — | (209) 532 1853 | Other | Columbia · Tuolumne County | — | — |
| Comfort Inspections | Comfort Inspections | — | (209) 694-6584 | Inspectors | Jamestown · Tuolumne County | — | — |
| Comphel Heating & Air Conditioning Inc. | Comphel Heating & Air Conditioning Inc. | — | (209) 396-7405 | HVAC | Sonora · Tuolumne County | — | — |
| Comphel Heating And Air Conditioning INC | Chad Robert Pais | — | (209) 532 0387 | HVAC | Sonora · Tuolumne County | — | — |
| Complete Construction An LLC | Randy Keith Voorhees | — | (530) 362 1146 | Electricians | Sonora · Tuolumne County | — | — |
| Concrete Innovations INC | Richard Howard Jones | — | (209) 586 6447 | Pool | Sonora · Tuolumne County | — | — |
| Confidence Ridge Construction | Robert Todd Smith | — | (209) 352 7962 | GC, remodel, ADU | Twain Harte · Tuolumne County | — | — |
| Consolidated Electrical Distributors | Consolidated Electrical Distributors | — | (209) 532-6948 | Electricians | Sonora · Tuolumne County | — | — |