| De Silva Construction | John Ireland De Silva | — | (760) 248 9163 | GC, remodel, ADU | Lucerne Valley · San Bernardino County | — | — |
| De Young Power Systems INC | Steven Mitchell De Young | — | (909) 748 7400 | Electricians | Redlands · San Bernardino County | — | — |
| Dealer Equipment Repair Service INC | Richard Lee Holt | — | (909) 271 9867 | Other | Hesperia · San Bernardino County | — | — |
| Dean Bacon | Dean Bacon | — | (909) 362 1375 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Dean Farrar Construction INC | Dean William Farrar | — | (909) 725 8897 | GC, remodel, ADU | Big Bear City · San Bernardino County | — | — |
| Dean Howard Heat & Air INC | Harold Dean Howard | — | (760) 559 8100 | HVAC | Apple Valley · San Bernardino County | — | — |
| Dean Mariani Jr | Dean Mariani Jr | — | (909) 229 9560 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Dean's Welding | Dean's Welding | info@deanswelding.com | (760) 949 5464 | Other | Victorville · San Bernardino County | — | — |
| Deanna Buck | Deanna Buck | — | (626) 914 2416 | Windows, patio, painters | Upland · San Bernardino County | — | — |
| Deans Half Price Plumbing And Drain | Dean Raymond Guerrero | — | (760) 900 9509 | Other | Hesperia · San Bernardino County | — | — |
| Deboer Construction | David Matthew Deboer | — | (909) 384 2664 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| Decar Construction | David Gutierrez Decarli | — | (909) 200 8284 | GC, remodel, ADU | Alta Loma · San Bernardino County | — | — |
| Decent Painting & Electrical | Ismael Garcia Carrillo | — | (909) 473 0870 | Electricians | San Bernardino · San Bernardino County | — | — |
| Deco - Data Electrical Communication & Optics | Zale Terry Harris | — | (909) 289 0047 | Electricians | Oak Hills · San Bernardino County | — | — |
| Deco Construction | Dora Pan Waters | hello@decoconstruction.com | (909) 838 9987 | GC, remodel, ADU | Redlands · San Bernardino County | — | — |
| Decorative Concrete Design | Decorative Concrete Design | — | (866) 881 4395 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| Dedicated Pool & Spa | Bobby Dean Kelley | — | (760) 574 3419 | Pool | Yucca Valley · San Bernardino County | — | — |
| Deepools Service & Repairs | Darwin Eduardo Penate Espinoza | — | (949) 235 8184 | Pool | Ontario · San Bernardino County | — | — |
| Deer Canyon Electric INC | Lionel Ralston Schoch | — | (909) 839 3693 | Electricians | Ontario · San Bernardino County | — | — |
| Dees Burke Engineering Constructors LLC | Dena Bryn Burke | — | (626) 228 3670 | Other | Ontario · San Bernardino County | — | — |
| Defend Alarm And Fire INC | Ramon Jr Carrillo | — | (909) 600 7151 | Electricians | Rialto · San Bernardino County | — | — |
| Defensive General Contractor | Emmanuel Gonzalez-Paz | — | (442) 353 3558 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Dehart Painting | Dehart Painting | — | (909) 634 6171 | Windows, patio, painters | Yucaipa · San Bernardino County | — | — |
| Del Comm | Del Comm | — | (909) 226 0017 | Other | Apple Valley · San Bernardino County | — | — |
| Del Mar Floor Covering INC | Martha Alicia Del Rio | — | (909) 331 6637 | Other | Ontario · San Bernardino County | — | — |
| Del Mar Painting | Del Mar Painting | — | (909) 578 2283 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| Del Mechanical | Del Mechanical | — | (909) 597 8328 | HVAC | Chino Hills · San Bernardino County | — | — |
| Del Rayo Construction | Zarate Flores Arturo | — | (714) 612 6519 | GC, remodel, ADU | Rialto · San Bernardino County | — | — |
| Del Rosa Pool Supply | Del Rosa Pool Supply | — | (909) 658 4376 | Pool | Yucaipa · San Bernardino County | — | — |
| Delbert L Fandrich | Delbert L Fandrich | — | (909) 435 6170 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| Delo Floors INC | Jose Miguel Lopez Sanchez | impallari@gmail.com | (909) 495 1595 | Other | San Bernardino · San Bernardino County | — | — |
| Delta Construction And Renovation LLC | Xiaotong Yang | — | (858) 900 6247 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Delta Energy Electrical Solution | Edgar Leonel Hernandez | — | (909) 559 2404 | Electricians | Ontario · San Bernardino County | — | — |
| Delta Group INC | Patrick Alan Thacker | — | (626) 695 6125 | Other | Ontario · San Bernardino County | — | — |
| Delta Private Security | Delta Private Security | — | (800) 498-6371 | Alarm and generators | San Bernardino · San Bernardino County | — | — |
| Demetrius Wallace | Demetrius Wallace | — | (760) 912 0806 | Other | Victorville · San Bernardino County | — | — |
| Demo & Dig Corp | Luis Javier Hernandez | — | (909) 283 2315 | Other | Fontana · San Bernardino County | — | — |
| Demo1st Services | Miguel Alberto Veliz | — | (909) 544 9541 | Other | Fontana · San Bernardino County | — | — |
| Denali Lath & Plaster INC | Juan Antonio Flores Rodriguez | — | (909) 471 6960 | Other | Fontana · San Bernardino County | — | — |
| Denali Roofing INC | Garcia Jaime Gomez | — | (909) 253 6965 | Other roofers | Hesperia · San Bernardino County | — | — |