| Crane Station INC | Rex Reyes Sevilla | — | (800) 891 3888 | Electricians | Benicia · Solano County | — | — |
| Crc Builders | James Glen Pitcher | — | (707) 421 8924 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Creative Comfort Systems | Creative Comfort Systems | — | (707) 643 2573 | HVAC | Vallejo · Solano County | — | — |
| Creative Image Landscaping | Creative Image Landscaping | — | (707) 689 3934 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Creekside Plumbing | Jared Paul Grensted | — | (530) 564 2166 | Other | Dixon · Solano County | — | — |
| Crg Insulation & Acoustical INC | Perez Joel Contreras | — | (707) 805 9935 | Other | Vallejo · Solano County | — | — |
| Cristian Suazo Elisea | Cristian Suazo Elisea | — | (707) 474 1955 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Crittendon Construction LLC | Vernell Anthony Crittendon | — | (510) 685 5651 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Crl Painting | Crl Painting | — | (613) 978-0500 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Croz Custom Metal Fabrication INC | Donald Richard Crossley | — | (707) 580 4727 | Other | Fairfield · Solano County | — | — |
| Crystal Clear Pool Service LLC | Antonio Delao | — | (707) 249 4636 | Pool | Vacaville · Solano County | — | — |
| Ct Builders | Ct Builders | — | (760) 637 6405 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Cuesta Geo INC | Chris Van Krieg | — | (925) 337 5546 | Electricians | Fairfield · Solano County | — | — |
| Cuevas Concrete | Humberto Cuevas-Lopez | — | (707) 761 2736 | Other | Vacaville · Solano County | — | — |
| Cuin Drywall | Cuin Drywall | — | (707) 332 6484 | Other | Fairfield · Solano County | — | — |
| Cumberland Post-tension INC | Terry Brad Alosi | — | (707) 747 5430 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Curtin's Quality Pool Service | Michael Keith Curtin | — | (707) 745 2116 | Pool | Benicia · Solano County | — | — |
| Cush Construction INC | Michael Antony Cush | — | (916) 947 1411 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Custom Bath Works | Custom Bath Works | — | (707) 207 1996 | Other | Fairfield · Solano County | — | — |
| Custom Bay Tile LLC | Carlos Martin Garcia Montoya | — | (415) 786 1744 | Other | Vallejo · Solano County | — | — |
| Custom Millworking | Custom Millworking | — | (925) 382 4614 | Other | Benicia · Solano County | — | — |
| Custom Valve Solutions INC | Neil Arthur Tiangsing | — | (925) 951-3234 | HVAC | Vallejo · Solano County | — | — |
| Cya Septic | Cya Septic | — | (707) 688 2246 | Other | Fairfield · Solano County | — | — |
| Cyr General Engineering | Cyr General Engineering | — | (530) 588 3586 | Other | Rio Vista · Solano County | — | — |
| D & C Landscaping INC | Dung Van Dinh | info@dclandscaping.com | (510) 353-6030 | Windows, patio, painters | Vallejo · Solano County | — | — |
| D & K Heating & Air Conditioning | David James White | — | (707) 344 0030 | HVAC | Vacaville · Solano County | — | — |
| D A D Fencing | D A D Fencing | — | (707) 450 6782 | Other | Vacaville · Solano County | — | — |
| D A R Plumbing Corp | Hugo Olivio Ruiz Garcia | — | (707) 696 8070 | Other | Fairfield · Solano County | — | — |
| D B R Enterprises LLC DBA Carpenter Crane Hoist | Benjamin Charles Jones | — | (707) 562 3543 | Other | Vacaville · Solano County | — | — |
| D C Acoustics And Insulation INC | Eric Allen Campbell | — | (707) 425 6569 | Other | Fairfield · Solano County | — | — |
| D C Construction | David Daniel Carr | — | (916) 256 0009 | GC, remodel, ADU | Dixon · Solano County | — | — |
| D C Electric | Dennis Gonzales Cardenas | — | (707) 426 2117 | Electricians | Suisun City · Solano County | — | — |
| D C S Interlocking Pavers | D C S Interlocking Pavers | — | (510) 205 1453 | Other | Fairfield · Solano County | — | — |
| D H Parkinson Construction | Daniel Hepner Parkinson | — | (707) 425 3205 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| D H Well Drilling And Service INC | Daniel Emmett Hagan | — | (707) 689 0645 | Other | Rio Vista · Solano County | — | — |
| D L C Construction Management | Israel Wilfredo De La Cruz Pescoran | — | (707) 750 5155 | GC, remodel, ADU | Benicia · Solano County | — | — |
| D L C Management INC | Israel Wilfredo De La Cruz Pescoran | — | (707) 750 5155 | GC, remodel, ADU | Benicia · Solano County | — | — |
| D L Construction | Dino Ray Molina | — | (415) 879 2733 | GC, remodel, ADU | Rio Vista · Solano County | — | — |
| D L M Flooring | D L M Flooring | — | (707) 365 5620 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| D M Pauletich & Sons Construction | Dwayne Michael Pauletich | — | (707) 731 3958 | GC, remodel, ADU | Vallejo · Solano County | — | — |