| Digital Boy INC | Brandon Richard Swartz | — | (949) 870 2885 | Other | Costa Mesa · Orange County | — | — |
| Digital Decora INC | Gregory Michael Lally | sales@digitaldecora.com | (714) 549 8400 | Electricians | Costa Mesa · Orange County | — | — |
| Digital Electric INC | Nava Mario | — | (714) 609 5040 | Electricians | Orange · Orange County | — | — |
| Digital Home Design | Cesar Augusto Guerrero | — | (949) 240 9096 | Other | Laguna Niguel · Orange County | — | — |
| Digital Media Concept | Digital Media Concept | — | (714) 823 7333 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Digitalglue | Robert Joseph Adrieiii Gagnon | — | (949) 388 9078 | Other | Dana Point · Orange County | — | — |
| Digitech Business Solutions INC | Dave Hamzee | — | (949) 466 0506 | Electricians | Santa Ana · Orange County | — | — |
| Digitopia | Seoung Guk Yang | — | (213) 219 3870 | Other | Anaheim · Orange County | — | — |
| Dillavou Construction INC | Joseph Allen Dillavou | — | (949) 939 3092 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| Dilworth Construction INC | Dustin William Dilworth | — | (949) 433 5535 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Dimaggio DBA Dimaggio Construction | Joshua Charles Di Maggio | — | (949) 279 6630 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dimensions INC | Neil Stewart Schwartz | — | (949) 613 3056 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Dinamic Mod Construction INC | David Cornel Damian | — | (714) 814 5058 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dinh's Construction | Duc Quang Dinh | — | (714) 914 0383 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dio Flooring LLC | Troy Mathew Diomartich | — | (949) 329 3868 | Other | Rancho Santa Margarita · Orange County | — | — |
| Dionati Painting INC | Jonathan Ezequiel Vazquez Dionati | — | (949) 870 0051 | Windows, patio, painters | Orange · Orange County | — | — |
| Diplomat Consultation & Management LLC | Mehrab Pouran | — | (949) 539 9911 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Dircio's Painting | Dircio's Painting | — | (714) 270 0518 | Windows, patio, painters | Fountain Valley · Orange County | — | — |
| Direct Connect Construction | Jeffery Allen Coss | — | (714) 455 3650 | Electricians | Anaheim · Orange County | — | — |
| Direct Flooring Source INC DBA Xprt Construction | Mohammad Saber Shahhosseini | — | (818) 920 9778 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Direct Guard Services - Orange County | Direct Guard Services - Orange County | — | (800) 578-2123 | Alarm and generators | Irvine · Orange County | — | — |
| Direct Interiors INC | Todd Lenard Johnson | — | (949) 842 0448 | Other | San Juan Capistrano · Orange County | — | — |
| Direct Shades & Blinds INC | Gene Wallace Goble | — | (714) 313 8630 | Other | Lake Forest · Orange County | — | — |
| Direct Sign | Direct Sign | — | (714) 206 9739 | Other | Westminster · Orange County | — | — |
| Direct Source Industrial Solutions INC | Hung The Nguyen | — | (714) 872 6800 | Electricians | Anaheim · Orange County | — | — |
| Dirkand INC DBA Water Savers Company | Dirk Steven Holcomb | — | (949) 955 1233 | Pool | Irvine · Orange County | — | — |
| Dirt INC | Fidel Cisneros Jr Melgoza | — | (949) 444 0454 | Other | Costa Mesa · Orange County | — | — |
| Discount Window And Door LLC | Walker Troy Jenkins | — | (714) 978 7200 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Distinguished Homes INC | Richard Ronald Cisakowski | — | (714) 637 4405 | GC, remodel, ADU | Anaheim Hills · Orange County | — | — |
| District West Construction | Jacob Antonio Weis | — | (714) 326 2044 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Dittemore Insulation Contractors INC | Jeffrey Michael Baxley | — | (714) 289 7095 | Other | Anaheim · Orange County | — | — |
| Divad Corporation | David Michael Smith | — | (877) 511 5554 | Other | Orange · Orange County | — | — |
| Diverse Lock Solutions | Diverse Lock Solutions | — | (626) 665 6226 | Other | Brea · Orange County | — | — |
| Diversified Asphalt Products INC | Chadwick Richard Martindale | — | (714) 449 8666 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Diversified Automation Services INC | Kevin Verdeen Kelsheimer | — | (949) 428 5040 | Electricians | Santa Ana · Orange County | — | — |
| Diversified Communications Services LLC | Jeremy Dale Bryan | — | (714) 888 2284 | Electricians | Brea · Orange County | — | — |
| Diversified Flooring INC | Samuel Lee Adams | — | (714) 788 8303 | GC, remodel, ADU | Atwood · Orange County | — | — |
| Diversified Painting INC | Michael Edward Cervenak | — | (714) 969 5962 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Diversified Roofing Systems INC | Peter Nils Van Dijk | — | (949) 652 6952 | Other roofers | Irvine · Orange County | — | — |
| Diversified Thermal Services LLC | Craig James Steinmetz | — | (714) 632 7401 | HVAC | Anaheim · Orange County | — | — |