| Dobson Construction | Saul Damian Dobson | — | (949) 205 3895 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Doc Support Construction | Arash Abolfathi | — | (855) 362 7877 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Docta Builders INC | Ezequiel Nicolas Rubin | erubin@doctabuilders.com | (949) 702 6442 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Doctor Drains LLC | Jordan Thomas Sanguedolce | — | (949) 879 9376 | Other | Laguna Beach · Orange County | — | — |
| Doctor Patch | Doctor Patch | — | (949) 698 0000 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Doheny Plumbing INC | Jerry Lee Pressnell | — | (949) 492 0137 | Other | San Clemente · Orange County | — | — |
| Dohrman Construction INC | Chad Dohrman | — | (714) 671 1400 | GC, remodel, ADU | Brea · Orange County | — | — |
| Dolphin General Construction INC | Fernando Cuamatzi | — | (714) 235 7320 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Dolphin Plumbing | Dolphin Plumbing | — | (714) 914 2442 | Other | Seal Beach · Orange County | — | — |
| Dolton Electrical Services | Thomas Michael Dolton | — | (949) 933 4841 | Electricians | San Juan Capistrano · Orange County | — | — |
| Doluu Designs | James Edward Callison | — | (714) 248 9539 | Electricians | Midway City · Orange County | — | — |
| Dom Construction LLC | Timothy Cannon Forsythe | info@dom-construction.com | (323) 638 5669 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Domador Commercial Services LLC | Burnett Jr Watkins | — | (805) 798 0025 | Electricians | San Clemente · Orange County | — | — |
| Dominguez Construction | Dominguez Hernandez Valeriano | info@ndiscovered.com | (714) 679 0630 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Dominguez Drywall | Dominguez Drywall | — | (714) 920 4092 | Other | Anaheim · Orange County | — | — |
| Dominguez Glass | Dominguez Glass | — | (562) 237 0771 | Windows, patio, painters | La Habra · Orange County | — | — |
| Dominic Carnesi | Dominic Carnesi | — | (714) 515 9848 | Electricians | Fullerton · Orange County | — | — |
| Dominic Orozco | Dominic Orozco | — | (657) 784 7488 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dominic The Electrician | Dominic The Electrician | — | (714) 969 3164 | Electricians | Fountain Valley · Orange County | — | — |
| Don Chang Landscaping | Don Chang Landscaping | — | (949) 502 1249 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| Don Edward Otrambo DBA Adco Electrical Contractor | Don Edward Otrambo | — | (714) 991 4938 | Electricians | Anaheim · Orange County | — | — |
| Don Fleming | Don Fleming | — | (909) 316 7100 | Electricians | Rancho Santa Margarita · Orange County | — | — |
| Don Fraser Construction | Donald Craig Fraser | — | (714) 315 2267 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Don Gabel Construction | Donald Thomas Gabel | — | (714) 401 8863 | GC, remodel, ADU | Orange · Orange County | — | — |
| Don Hansen Enterprises | Donald Eugene Hansen | — | (714) 231 3284 | Electricians | Santa Ana · Orange County | — | — |
| Don Kaiser Electric | Donald John Kaiser | — | (949) 899 3929 | Electricians | Aliso Viejo · Orange County | — | — |
| Don Nishikawa DBA D & N Plants | D & N Plants | — | (714) 337 1567 | Windows, patio, painters | Midway City · Orange County | — | — |
| Don R Golden & Jeffrey M Golden | Don Richard Golden | — | (949) 275 1989 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Don R Weiler | Don R Weiler | — | (714) 612 7915 | Other | Huntington Beach · Orange County | — | — |
| Don Walker Construction | Donald Irving Walker | — | (808) 640 7960 | GC, remodel, ADU | Laguna Woods · Orange County | — | — |
| Don Wallingsford INC | Don Curtis Wallingsford | — | (714) 693 0111 | HVAC | Anaheim · Orange County | — | — |
| Don Weber Construction INC | Yanni Li | — | (949) 350 0633 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Don Wert Construction | Donald Thomas Wert | — | (949) 633 3428 | Other | San Clemente · Orange County | — | — |
| Don Whetstine - Builder INC | Donald Jeffery Whetstine | — | (714) 321 9913 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Don White Plumbing | Don White Plumbing | — | (714) 234 6650 | Other | Santa Ana · Orange County | — | — |
| Don Williams Landscape And Tree Service | Julia Denise Williams | — | (714) 363 3740 | Windows, patio, painters | Orange · Orange County | — | — |
| Don's Drapery Service INC | Donald Clay Curtis | — | (714) 577 9192 | Other | Anaheim · Orange County | — | — |
| Don's Plumbing | Don's Plumbing | — | (949) 290 8806 | Other | Dana Point · Orange County | — | — |
| Donald B Blayney Construction Co | Donald Brian Blayney | — | (818) 427 6154 | GC, remodel, ADU | Seal Beach · Orange County | — | — |
| Donald F Holly & Son INC | Donald Frank Sr Holly | — | (714) 526 2010 | Electricians | Fullerton · Orange County | — | — |