| California Glass Of Vallejo INC | Aaron Christopher Bolton | — | (707) 643 5609 | Windows, patio, painters | Vallejo · Solano County | — | — |
| California Landscaping Dp | Thanh Van Ngo | — | (707) 333 8620 | Windows, patio, painters | Fairfield · Solano County | — | — |
| California Pool & Spa Service & Repair | Anthony Lee Wong | — | (707) 209 5876 | Pool | Vallejo · Solano County | — | — |
| California Premier Roofing | Brian Sean Sauer | cpremieroofing@yahoo.com | (707) 209 9390 | Other roofers | Benicia · Solano County | — | — |
| California Quality Insulation | California Quality Insulation | — | (707) 805 9935 | Other | Vallejo · Solano County | — | — |
| California Retaining Walls Co | Toni Patricia Mitchel | — | (707) 745 0200 | Other | Benicia · Solano County | — | — |
| California Roofing | Jose Damian Camacho | — | (707) 530 3505 | Other roofers | Vallejo · Solano County | — | — |
| California Switchgear | Kevin Francis Inglesby | sales@deipower.com | (707) 688 3643 | Electricians | Vacaville · Solano County | — | — |
| California Tile Restoration | California Tile Restoration | — | (707) 389 8375 | Restoration | Suisun City · Solano County | — | — |
| California Valley Landscape INC | John Costa Ferreira | — | (707) 448 4832 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Calinc Services INC | David Wayne Esparza | — | (707) 446 7996 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Calinc Training LLC | David Wayne Esparza | — | (707) 446 7996 | Other roofers | Vacaville · Solano County | — | — |
| Calvary Construction Services | Kenneth Elwood Jr Caspers | — | (707) 450 0400 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Cam Construction And Painting | Cesar Anthony Mendes | — | (707) 446 2226 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Camacho Construction | Luis Carlos Camacho | — | (510) 680 4267 | GC, remodel, ADU | Suisun City · Solano County | — | — |
| Camacho Mechanical | Camacho Mechanical | — | (209) 607 9807 | HVAC | Rio Vista · Solano County | — | — |
| Camacho's Concrete | Camacho's Concrete | — | (707) 971 6038 | Other | Fairfield · Solano County | — | — |
| Camacho's Painting | Camacho's Painting | — | (415) 532 5339 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Camarillo Roofing Solution | Montar Juan Camarillo | camarilloroofingsolution@yahoo.com | (707) 716 7720 | Other roofers | Fairfield · Solano County | — | — |
| Cameron Walker | Cameron Walker | — | (707) 438 5669 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Camilo's Palm Tree Service INC | Jorge Arturo Rodriguez Hernandez | — | (707) 384 9867 | Other | Fairfield · Solano County | — | — |
| Campbell's Tree Service | Colin Craig Campbell | — | (707) 374 3299 | Tree | Rio Vista · Solano County | — | — |
| Campos Construction | Benjamin Raymond Campos | — | (510) 705 3733 | GC, remodel, ADU | Elmira · Solano County | — | — |
| Candido Construction | Francisco Javier Candido | — | (707) 280 7618 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Canlas Build LLC | Lemuel Laxamana Canlas | — | (510) 610 1154 | Electricians | Vallejo · Solano County | — | — |
| Canyon Contracting & Design INC | Jeffery Paul Fernandez | — | (707) 326 5390 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Capital Roofcare | Capital Roofcare | — | (707) 999 8470 | Other roofers | Vacaville · Solano County | — | — |
| Capitol Glass Co INC | Michael Bolieiro Amaral | — | (707) 745 4570 | Windows, patio, painters | Benicia · Solano County | — | — |
| Cardoza Builder LLC | Jose Luis Casco | walter@cardozabuilder.com | (415) 902 8309 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Cardoza Mechanical | Cardoza Mechanical | — | (661) 437 1023 | HVAC | Vacaville · Solano County | — | — |
| Care Stone Builders LLC | Jonathan Robert Cadorin | support@carestonebuilders.com | (916) 661 0323 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Carjo Group INC | Carlos Dimas Gonzalez | — | (707) 429 3350 | Other | Fairfield · Solano County | — | — |
| Carjo Group Northbay INC | Carlos Dimas Gonzalez | — | (925) 584 7204 | Other | Fairfield · Solano County | — | — |
| Carlisle Construction | Frank Carlisle | — | (925) 890 9458 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Carlos Aguilar Painting | Carlos Aguilar Painting | — | (415) 717 8537 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Carlos Landscape | Paniagua Carlos | — | (707) 265 0846 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Carlson Construction | Gary Keith Carlson | — | (707) 429 2946 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Carmody Construction | Nathaniel David Carmody | — | (707) 812 9995 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Caro Electric LLC | Vicente Cristoval Caro | — | (707) 674 7910 | Electricians | Vallejo · Solano County | — | — |
| Carrier Construction | Philip James Carrier | — | (707) 249 9102 | GC, remodel, ADU | Dixon · Solano County | — | — |