| Chris Saville General Contractor | Chris Saville General Contractor | — | (209) 795 2298 | GC, remodel, ADU | Avery · Calaveras County | — | — |
| Christopher's Electrical | Christopher Michael Bruce | — | (209) 712 8136 | Electricians | Arnold · Calaveras County | — | — |
| Cisco Fire Sprinklers INC | Bruce D Eads | — | (209) 785 2643 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Citybright Electric LLC | Macias Alex Silva | — | (510) 775 3530 | Electricians | Valley Springs · Calaveras County | — | — |
| Clark Fencing | Clark Fencing | — | (209) 297 1644 | Other | Mokelumne Hill · Calaveras County | — | — |
| Classic Design Fine Cabinetry | Classic Design Fine Cabinetry | — | (209) 772 3652 | Other | Valley Springs · Calaveras County | — | — |
| Classic Drywall | Classic Drywall | — | (650) 452 4080 | Other | Copperopolis · Calaveras County | — | — |
| Clear Cut Painting | Clear Cut Painting | — | (209) 628 1042 | Windows, patio, painters | Copperopolis · Calaveras County | — | — |
| Clements Construction | Damon Benny Clements | — | (916) 627 0982 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Clifford E Overmier | Clifford E Overmier | — | (209) 754 1577 | Other | San Andreas · Calaveras County | — | — |
| Clifford Stevens | Clifford Stevens | — | (209) 768 9435 | Windows, patio, painters | Camp Connell · Calaveras County | — | — |
| Cloward Construction | Delmar Grant Cloward | — | (209) 419 3993 | GC, remodel, ADU | Mokelumne Hill · Calaveras County | — | — |
| Cm Construction | Christopher Miles Merwin | — | (916) 995 2508 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Cmr Painting | Cmr Painting | — | (925) 389 7080 | Windows, patio, painters | Valley Springs · Calaveras County | — | — |
| Coast To Country Construction | Ryan Thomas Morrissey-irvine | — | (650) 576 9648 | GC, remodel, ADU | Mountain Ranch · Calaveras County | — | — |
| Coggins Construction | Brad Alan Coggins | — | (209) 795 3092 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Coldani Insulation & Garage Doors | Richard Aaron Coldani | — | (209) 256 2345 | Other | Valley Springs · Calaveras County | — | — |
| Cole Specialty Construction And Drywall | Aaron Howard Cole | — | (209) 505 1997 | Other | Angels Camp · Calaveras County | — | — |
| Cole Tiscornia Construction | Cole John Tiscornia | — | (209) 471 0826 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Collins Masonry Company | Wyatt Hal Collins | — | (209) 423 1290 | Other | Avery · Calaveras County | — | — |
| Colorworks Painting | Colorworks Painting | — | (760) 746-5464 | Windows, patio, painters | Escondido · Calaveras County | — | — |
| Compass Security Systems | Compass Security Systems | — | (760) 855-2032 | Alarm and generators | Valley Center · Calaveras County | — | — |
| Competitive Auto Electrical | Competitive Auto Electrical | — | (855) 471-2673 | EV chargers | Rancho Calaveras · Calaveras County | — | — |
| Comprehensive Construction Services | Michael Anthony Triano | — | (209) 603 5373 | GC, remodel, ADU | Burson · Calaveras County | — | — |
| Concrete N More | Concrete N More | — | (408) 398 4122 | Other | Copperopolis · Calaveras County | — | — |
| Consolidated Engineering INC | Casey Michael Curtin | — | (209) 752 5366 | Other | Valley Springs · Calaveras County | — | — |
| Constant Construction LLC | Ryan Courtney Constant-Rosteski | — | (209) 431 9164 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Contreras Plumbing A Partnership | Ricardo Miguel Contreras | — | (209) 813 5673 | Other | Copperopolis · Calaveras County | — | — |
| Contreras Plumbing LLC | Richard Michael Jr Contreras | contact@contrerasplumbing.com | (209) 813 5673 | Other | Copperopolis · Calaveras County | — | — |
| Cook Construction | William James Cook | — | (916) 997 7201 | GC, remodel, ADU | Burson · Calaveras County | — | — |
| Cooper General Engineering INC | William Nathan Cooper | — | (209) 795 5475 | Other | Arnold · Calaveras County | — | — |
| Copper Crest Electric | Copper Crest Electric | — | (760) 800-0021 | Electricians | Bonsall · Calaveras County | — | — |
| Corky Graham Construction | Corky Guy Graham | — | (707) 592 7076 | GC, remodel, ADU | Mokelumne Hill · Calaveras County | — | — |
| Cornerstone Steel Fabrication | Cornerstone Steel Fabrication | — | (209) 728 4126 | Other | Angels Camp · Calaveras County | — | — |
| Cort Hellenthal Construction | Hellenthal Cort | — | (831) 252 9496 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Costa Quality Works | Costa Quality Works | — | (209) 606 3924 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Cpc Construction Services INC | Christopher Adam Pinney | — | (510) 614 5527 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Craig Builders | Craig Builders | — | (510) 693 3991 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Craig Tatum Construction | Craig Davis Tatum | — | (209) 770 3778 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Crandell Engineering | Crandell Engineering | — | (925) 303 6110 | Other | Valley Springs · Calaveras County | — | — |