| Curtis Vance | Curtis Vance | — | (909) 438 5822 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Curtis Williams Electric | Curtis Damien Williams | — | (909) 856 7427 | Electricians | Fontana · San Bernardino County | — | — |
| Custom Asphalt INC | Dorothy Ellaine Seiker | interested@domainmarket.com | (909) 623 8211 | Other | Upland · San Bernardino County | — | — |
| Custom Brick & Block Masonry | Guadalupe Jr Tule | — | (323) 365 1370 | Other | Ontario · San Bernardino County | — | — |
| Custom Built Pools & Spas | Custom Built Pools & Spas | — | (909) 921 9046 | Pool | Fontana · San Bernardino County | — | — |
| Custom Carpentry | Arturo G Iii Martinez | — | (951) 634 4510 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Custom Concepts Construction | Jason John Van Elzakker | — | (909) 709 7446 | GC, remodel, ADU | Alta Loma · San Bernardino County | — | — |
| Custom Concrete Systems | Custom Concrete Systems | customconcretesystems@yahoo.com | (909) 771 8929 | Other | Yucaipa · San Bernardino County | — | — |
| Custom Construction | Mark Francis Boroch | — | (909) 996 2981 | Other roofers | Ontario · San Bernardino County | — | — |
| Custom Design Construction | David Thomas-champ Cochran | — | (714) 335 0842 | GC, remodel, ADU | Wrightwood · San Bernardino County | — | — |
| Custom Drywall Specialists INC | Manuel Sencion | — | (909) 226 2547 | Other | Ontario · San Bernardino County | — | — |
| Custom Electrical Services | Joshua Matthew Salas | — | (909) 269 1621 | Electricians | Colton · San Bernardino County | — | — |
| Custom Floor Creations INC | Morales Jesus Jimenez | — | (909) 499 3395 | Other | San Bernardino · San Bernardino County | — | — |
| Custom Homes Contractor DBA Custom Homes Construction | Ansary Aboubakare | — | (714) 809 6827 | HVAC | Ontario · San Bernardino County | — | — |
| Custom Interlocking Pavers INC | Aragon Carlos Martinez | — | (562) 447 4897 | Other | San Bernardino · San Bernardino County | — | — |
| Custom Mojave Pools INC | Joseph Raymond Buchheit | — | (888) 293 8488 | Pool | Victorville · San Bernardino County | — | — |
| Custom Mountain Homes INC | David Nathanial Ferguson | — | (909) 754 2131 | GC, remodel, ADU | Lake Arrowhead · San Bernardino County | — | — |
| Custom Pro Tile & Stone INC | Vazquez Raul | — | (909) 360 0389 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Custom Professional Electronics INC | Raymond Badir | — | (626) 641 3211 | Other | Ontario · San Bernardino County | — | — |
| Custom Termite & Pest Control | Custom Termite & Pest Control | — | (909) 497-6219 | Pest, tile roofs | San Bernardino · San Bernardino County | — | — |
| Custom Tile | Custom Tile | — | (909) 717 6711 | Other | Montclair · San Bernardino County | — | — |
| Cut Above Construction & Contracting INC | David Wayne Chambers | — | (909) 615 2887 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Cut N Dry Restoration | James Jacob Mcneely | mitigation@cutndryrestoration.com | (909) 987 9861 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| Cutler Power And Light INC | Ryan Daniel Cutler | — | (909) 319 4991 | Electricians | Chino · San Bernardino County | — | — |
| Cutting Edge Builders INC | Frank Patrick Coniglio | — | (909) 989 4900 | GC, remodel, ADU | Alta Loma · San Bernardino County | — | — |
| Cutting Edge Commercial Construction | Paul Daniel Andrade | — | (909) 272 7587 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Cutting Edge Construction | Joseph Lane Rowlette | — | (909) 559 7216 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Cv Floors | Cv Floors | — | (909) 957 2291 | Other | Fontana · San Bernardino County | — | — |
| Cvhd Services INC | Perry James Pastion | info@cvhdservices.com | (760) 799 4650 | Electricians | Yucca Valley · San Bernardino County | — | — |
| Cvmd INC | Kendra Rose Mackwitch | — | (760) 275 3528 | GC, remodel, ADU | Yucca Valley · San Bernardino County | — | — |
| Cyber Guard Protection Inc. | Cyber Guard Protection Inc. | info@cyberguardprotection.com | (951) 666-1563 | Alarm and generators | San Bernardino · San Bernardino County | — | — |
| Cyppress Apartment INC DBA Nedall Construction | Tayseer Mohamad Mohamad | — | (909) 644 2906 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| D & B Custom Cabinets INC | Dinh Van Nguyen | — | (909) 628 6643 | Other | Chino · San Bernardino County | — | — |
| D & B Pressure Washing | Blake Annatolio Vazmendes | — | (760) 219 4058 | GC, remodel, ADU | Redlands · San Bernardino County | — | — |
| D & D Burkhart General Contractor | Daniel Scott Burkhart | — | (909) 948 8798 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| D & D Contractors INC | Marin David Gonzalez | — | (909) 933 3745 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| D & D Custom | D & D Custom | — | (760) 831 6953 | GC, remodel, ADU | Yucca Valley · San Bernardino County | — | — |
| D & D HVAC INC | Arman Alex Asaturian | — | (323) 872 4186 | HVAC | Fontana · San Bernardino County | — | — |
| D & J Contractors INC DBA Foothills Heating & Cooling | Daniel Alexander Figueroa | — | (909) 573 3808 | HVAC | Chino · San Bernardino County | — | — |
| D & L Home Solutions | D & L Home Solutions | — | (951) 830 2494 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |