| Desi Window Coverings | Andres Mondragon Garibay | — | (442) 800 5110 | Other | Victorville · San Bernardino County | — | — |
| Design Concepts | Design Concepts | — | (909) 591 3939 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Design Concepts In Tile | Design Concepts In Tile | — | (760) 217 3297 | Other | Hesperia · San Bernardino County | — | — |
| Design Windows & Doors INC | Jill Lyn Pentolino | — | (909) 980 3003 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Designed Concepts Construction Company | Eli Andrew Echiribel | — | (562) 298 2154 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Designer Works | Wesley Stephen Ehle | — | (909) 947 5777 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Designing Manufacturing Installation | Thomas Apostolos Pappas | — | (760) 530 9100 | GC, remodel, ADU | Adelanto · San Bernardino County | — | — |
| Desmont Properties | Heinz Joseph Steinmann | — | (760) 887 8069 | GC, remodel, ADU | Wrightwood · San Bernardino County | — | — |
| Dessa Electric Company | Justin Allan Dessa | — | (909) 837 8547 | Electricians | Ontario · San Bernardino County | — | — |
| Devco Sandblasting | Devco Sandblasting | — | (909) 792 2293 | Other | Redlands · San Bernardino County | — | — |
| Devine And Son Plumbing | Devine And Son Plumbing | — | (909) 647 5013 | Other | Highland · San Bernardino County | — | — |
| Devine Looks Home Design & Construction | Juan Carlos Lopez Zavala | — | (909) 678 4626 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Dew Sprinklers + Services | Douglas Edward Wood | — | (951) 543 7883 | Windows, patio, painters | Yucaipa · San Bernardino County | — | — |
| Dewess Plumbing | Dewess Plumbing | — | (760) 887 6860 | Other | Hesperia · San Bernardino County | — | — |
| Dewey Pest & Termite Control | Dewey Pest & Termite Control | — | (909) 699-0018 | Pest, tile roofs | Colton · San Bernardino County | — | — |
| Dez Rez LLC | David Shane Faux | — | (760) 953 5220 | Other | Apple Valley · San Bernardino County | — | — |
| Dg Concrete | Dg Concrete | — | (760) 818 4337 | Other | Barstow · San Bernardino County | — | — |
| Dg's Lawncare | Dg's Lawncare | — | (760) 955 8873 | Windows, patio, painters | Victorville · San Bernardino County | — | — |
| Dgd Remodling | Daniel Antonio Granados | — | (714) 386 9375 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Dgi Structures INC | David Alan Aandewiel | — | (909) 986 8899 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Dgo Roofing | Acevedo-saucedo Marcos | — | (626) 367 6662 | Other roofers | Phelan · San Bernardino County | — | — |
| Dh Remodel & Construction INC | Dean Charles Heinlein | — | (626) 523 5422 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Dhillon Construction | Ranjit S Dhillon | — | (909) 944 8678 | Electricians | Alta Loma · San Bernardino County | — | — |
| Di Shao Construction | Shao Di | — | (484) 986 7856 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Dial One Moore Associates Security Systems | George Edward Jr Moore | — | (800) 542 4030 | Electricians | Chino Hills · San Bernardino County | — | — |
| Diamond Air Services INC | Hau Truong Vo | — | (909) 713 6644 | HVAC | Ontario · San Bernardino County | — | — |
| Diamond Bar Electric INC | Matthew Bernerd Bogy | sales@diamondbarelectric.com | (909) 860 6590 | Electricians | Chino · San Bernardino County | — | — |
| Diamond Construction | Michelle Leanne Horton | todd@diamond-construction.com | (513) 519-7766 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| Diamond Construction Services | Brian Albert Sunny | — | (909) 496 6346 | GC, remodel, ADU | Redlands · San Bernardino County | — | — |
| Diamond Floor's | Salvador Hernandez Gonzalez | — | (951) 377 2106 | Other | Colton · San Bernardino County | — | — |
| Diamond Homes And Construction INC | Juan Carlos Madiedo | — | (626) 625 2836 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Diamond Patios | Gary Mitch Southern | — | (909) 322 9046 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| Diamond Pure Water Filtration INC | Johnny Salvador Sanchez | info@diamondpurewaterfiltration.com | (909) 295 1364 | Other | Chino · San Bernardino County | — | — |
| Diamond Rock Concrete Restoration | Nancy R Hernandez | — | (909) 347 7247 | Restoration | Rancho Cucamonga · San Bernardino County | — | — |
| Diamond West Builders | Diamond West Builders | — | (951) 347 2025 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Diamondback Sawing And Coring INC | James Franklin Walker | — | (909) 357 1566 | Other | Fontana · San Bernardino County | — | — |
| Diane Lee Irwin | Diane Lee Irwin | — | (760) 247 7634 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Diarmuid Griffin | Diarmuid Griffin | — | (818) 451 8910 | GC, remodel, ADU | Highland · San Bernardino County | — | — |
| Diaz Landscape | Hernandez Osvaldo Diaz | manueldiazlandscaping@gmail.com | (760) 885 6193 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| Diaz Landscaping INC DBA A & S Landscaping | Anthony Diaz | — | (951) 657 5336 | Windows, patio, painters | Fontana · San Bernardino County | — | — |