| Concept Construction | Jimmie Alfred Walker | — | (760) 686 4826 | GC, remodel, ADU | Helendale · San Bernardino County | — | — |
| Conco Construction Engineer Design & Build INC | Shannon Roland Denmark | — | (760) 247 8814 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Concor Building Solutions INC | Benjamin Sandobal Grijalva | — | (909) 835 2200 | GC, remodel, ADU | Colton · San Bernardino County | — | — |
| Concrete Connection INC | Albert Godoy Carrillo | — | (909) 597 9633 | Other | Chino Hills · San Bernardino County | — | — |
| Concrete Daddy Construction & Pumping | Segura Sergio Ramirez | — | (909) 684 2276 | Other | Fontana · San Bernardino County | — | — |
| Concrete Expertz | Anna Valenitainc Tukutau | — | (310) 918 2568 | Other | San Bernardino · San Bernardino County | — | — |
| Concrete Ideas | Concrete Ideas | — | (714) 803 2627 | Other | Blue Jay · San Bernardino County | — | — |
| Concrete Masters INC | Daniel Aaron Martinez | — | (909) 275 9438 | Other | Apple Valley · San Bernardino County | — | — |
| Concrete Protection Systems West INC | Richard Craig Hunt | — | (909) 984 6100 | Other | Ontario · San Bernardino County | — | — |
| Concrete Service Pros INC | Luis Enrique Velazquez-Angulo | — | (909) 341 3111 | Other | Fontana · San Bernardino County | — | — |
| Concretepanda Co | Alexander Eliseo Martinez | — | (909) 205 4338 | Other | San Bernardino · San Bernardino County | — | — |
| Condominium Construction Services INC | James Irvin Schlagel | — | (626) 852 2110 | Other roofers | Upland · San Bernardino County | — | — |
| Condor Electric Co | Carole Ardys Ray | — | (951) 206 1522 | Electricians | Upland · San Bernardino County | — | — |
| Confidence Builder The Construction Company | Claude Kelly Guinther | — | (626) 252 0648 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Connectivity Solutions | Connectivity Solutions | — | (818) 712 9100 | Other | Apple Valley · San Bernardino County | — | — |
| Connector Electric | Joe Dan Sumpter | — | (909) 730 1940 | Electricians | Alta Loma · San Bernardino County | — | — |
| Consko General Construction INC | Danny Donghee Lee | — | (213) 505 0444 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Consolo Fence | Consolo Fence | — | (909) 753 9646 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Constatino's Landscaping INC | Jimenez Constantino | — | (909) 684 9898 | Windows, patio, painters | Rancho Cucamonga · San Bernardino County | — | — |
| Constru One INC | Maria Guadalupe Salgado Monroy | construone@construone.com | (909) 680 2418 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Constructa | Ralf George Zacky | — | (909) 794 6862 | GC, remodel, ADU | Mentone · San Bernardino County | — | — |
| Constructify INC | Rodd Golshan | — | (840) 201 7395 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Construction | Cesar Pena | — | (760) 493 0886 | GC, remodel, ADU | Victorville · San Bernardino County | — | — |
| Construction | Gerald Lee Fix | — | (909) 702 3503 | Other | Fontana · San Bernardino County | — | — |
| Construction & Restoration | Martin Machuca-Romero | — | (909) 680 9678 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Construction Collective LLC | Brett Tyler Smith | — | (909) 758 1976 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Construction Excellence | Vasquez Ricardo | — | (949) 355 2033 | GC, remodel, ADU | Redlands · San Bernardino County | — | — |
| Construction Services Co | Larry Kirk Hollins | — | (909) 641 4810 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Construction Station Flooring And Design INC | Gustavo Mancilla | — | (909) 797 6333 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| Construction West INC | James Blair Johnston | — | (909) 322 5437 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Constructors J-mak INC | Juan Manuel Arreguin Cazarez | — | (323) 620 4353 | Other | Montclair · San Bernardino County | — | — |
| Construx West INC | Ryan Charles Schneider | — | (909) 470 0193 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Contemporary Landscape And Maintenance INC | Rafael Flores Velazco | — | (760) 240 7770 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| Continental Flooring INC | Brian Douglas Ruff | — | (909) 941 8305 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Contract Flooring Services | Robert Jr Urzua | enquiries@contractflooringservices.com | (909) 208 8486 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Control Solutions Electric | Estrada-gutierrez Juvenal | — | (909) 491 8621 | Electricians | Fontana · San Bernardino County | — | — |
| Control Solutions Electric | Juvenal Estrada-Gutierrez | — | (909) 491 8621 | Electricians | Fontana · San Bernardino County | — | — |
| Control Systems | Control Systems | — | (909) 859 4156 | Electricians | Ontario · San Bernardino County | — | — |
| Control Temp INC | John Mark Kimm | — | (909) 793 8014 | HVAC | Redlands · San Bernardino County | — | — |
| Controlworks INC | Jason Daniel Briggs | — | (909) 627 7155 | HVAC | Chino · San Bernardino County | — | — |