| Deep Green Landscape | Jose Ricardo Calvillo | — | (714) 366 8916 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Deep Water Plumbing & Heat & Air | Fredrick Abner Lewis | — | (714) 234 6826 | HVAC | Anaheim · Orange County | — | — |
| Deese Flooring | Deese Flooring | — | (714) 244 6653 | Other | Garden Grove · Orange County | — | — |
| Defender Solution | Defender Solution | support@defendersolution.tech | (714) 860 9866 | Electricians | Anaheim · Orange County | — | — |
| Defender Solution Cctv - Alarm Systems | Defender Solution Cctv - Alarm Systems | — | (657) 276-6885 | Alarm and generators | Fountain Valley · Orange County | — | — |
| Defi Construction INC | Chad Stephen Compton | — | (562) 243 9666 | GC, remodel, ADU | Orange · Orange County | — | — |
| Definition Electricals & Entertainment | Sean Sharmad Bronson | — | (310) 371 0019 | Other | Irvine · Orange County | — | — |
| Definition Technologies & Fabrication | Kavan Berenjian | — | (949) 444 4434 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| Degennaro Plumbing INC | James Christopher Degennaro | — | (714) 941 6022 | GC, remodel, ADU | Orange · Orange County | — | — |
| Dehart Construction Services | James Robert Dehart | — | (714) 392 6725 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Deja Vu Construction | Steven Minh-tuan Do | — | (469) 360 9440 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| Dekker Pool And Spa Service | Theodore Iv Dekker | — | (714) 292 6429 | Pool | Yorba Linda · Orange County | — | — |
| Dekra - Lite Industries Incorporated | Russell Julian Warner | — | (714) 436 0705 | Electricians | Santa Ana · Orange County | — | — |
| Del Pozo Drywall | Del Pozo Drywall | — | (949) 278 5313 | Other | Irvine · Orange County | — | — |
| Del Ray Development INC | Levert Eugene | — | (310) 779 3981 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Del Rey Construction / Woodworking INC | Jose Marcos Jr Velasco | — | (714) 402 4880 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Del Sol Construction & Roofing | Romero Roberto | — | (949) 454 1938 | Other roofers | Mission Viejo · Orange County | — | — |
| Del Sol Construction INC | Roberto Romero | — | (949) 454 1938 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Del Toro Construction Services | Ramon Andres Del Toro | — | (714) 267 1571 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Del Valle Painting Co | Daniel Rit Jimenez Jimenez | — | (714) 658 8895 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Del's Tree Experts INC | Monse Azyadet Salazar | — | (714) 767 1885 | Tree | Anaheim · Orange County | — | — |
| Delacruz Cabinetry INC | Juan Jesus De La Cruz | — | (714) 399 8475 | Other | Santa Ana · Orange County | — | — |
| Delarman | Safa Movassaghi | — | (949) 877 1893 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Delatorre All Purpose Plumbing | Delatorre All Purpose Plumbing | — | (714) 227 8370 | Other | Garden Grove · Orange County | — | — |
| Delbert Kim | Delbert Kim | — | (213) 312 7546 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Delco Electric Enterprises INC | Gilbert Anthony Delgado | — | (714) 514 2949 | Electricians | La Habra · Orange County | — | — |
| Delcon INC | Bernard Jay Delzer | — | (949) 759 4367 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Delgadillo Landscape & Maintenance | Delgadillo Landscape & Maintenance | — | (714) 335 3415 | Windows, patio, painters | Yorba Linda · Orange County | — | — |
| Delgado Flooring Systems INC | Duran Miguel Gomez | — | (714) 561 9789 | Other | Anaheim · Orange County | — | — |
| Delmar Demolition | Delmar Demolition | — | (949) 290 2719 | Other | San Clemente · Orange County | — | — |
| Delmar Refrigeration | Mario Alberto Ceja | — | (714) 552 4156 | HVAC | Santa Ana · Orange County | — | — |
| Delmore Security Systems | Delmore Security Systems | — | (949) 770 7900 | Alarm and generators | Lake Forest · Orange County | — | — |
| Delta Builder And Remodeling INC | John Hua | — | (714) 987 0787 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Delta Construction Co | Tran David | — | (714) 987 0787 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Delta Floors Carpet One Floor & Home | Joseph Saehyun Kwon | — | (714) 758 0030 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Delta Plumbing & HVAC INC | Parisa Molazemi | — | (714) 458 6715 | HVAC | Anaheim · Orange County | — | — |
| Delta Power INC | Hosein Gilani | — | (714) 558 6177 | Electricians | Lake Forest · Orange County | — | — |
| Delta Roofing | Alvarez Fidel Tolentino | — | (949) 922 3676 | Other roofers | Costa Mesa · Orange County | — | — |
| Delta T HVAC INC | Gulyan Narek | — | (714) 661 6161 | HVAC | Anaheim · Orange County | — | — |
| Dem Construction | Douglas Edward Menezes | — | (714) 936 1874 | GC, remodel, ADU | Tustin · Orange County | — | — |