| De La Rosa Painting | La Rosa David De | — | (714) 851 0149 | Windows, patio, painters | Orange · Orange County | — | — |
| De La Rosa Plumbing | Jose Cruz De La Rosa De La Cruz | — | (714) 483 8807 | Other | Fullerton · Orange County | — | — |
| De La Torre All Purpose Plumbing INC | Catalino Victor De La Torre | — | (714) 227 8370 | Other | Garden Grove · Orange County | — | — |
| De La Torre Commercial Interiors INC | Edward Michael De La Torre | — | (714) 685 9077 | GC, remodel, ADU | Orange · Orange County | — | — |
| De La Torre Construction | Edward Michael De La Torre | — | (714) 685 9077 | GC, remodel, ADU | Orange · Orange County | — | — |
| De Leon Flooring | De Leon Flooring | — | (949) 230 6526 | Other | Lake Forest · Orange County | — | — |
| De Leon General Construction INC | Byron Roberto Deleon | — | (949) 600 0715 | GC, remodel, ADU | Tustin · Orange County | — | — |
| De Leon Synthetic Surfaces | Diego Andree De Leon | — | (714) 363 3277 | Other | Orange · Orange County | — | — |
| De Luna Construction | Mario Luis Deluna | — | (714) 276 7017 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| De Priest Designs | De Priest Designs | — | (714) 504 3473 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| De That Ton | De That Ton | — | (714) 724 4476 | Electricians | Westminster · Orange County | — | — |
| De Vore Pools & Spas | De Vore Pools & Spas | — | (949) 503 1240 | Pool | San Juan Capistrano · Orange County | — | — |
| Dea Construction INC | David Chieu Luong | — | (206) 795 1404 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Deal Construction INC | Steven Michael Deal | — | (949) 338 8298 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Dean Concrete INC | Daniel Roy Dean | — | (949) 317 0845 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Dean Daniels | Dean Daniels | — | (714) 676 7320 | Other | Orange · Orange County | — | — |
| Dean Edwin Braymer | Dean Edwin Braymer | — | (714) 321 8287 | Pool | Anaheim · Orange County | — | — |
| Dean Hesketh Company INC | Matthew Douglas Hesketh | — | (714) 236 2121 | Other | Anaheim · Orange County | — | — |
| Dean Rhoades Const | Dean Rhoades Const | — | (714) 310 9901 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Dean Smithlin Company INC | Dean Peter Smithlin | — | (949) 689 7228 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Dean Visosky Contractors INC | Richard Lyn Jr Visosky | — | (714) 363 3575 | GC, remodel, ADU | Orange · Orange County | — | — |
| Deangelis Electric | Riccardo Jr Deangelis | — | (714) 393 8123 | Electricians | Huntington Beach · Orange County | — | — |
| Deans Painting Service | Dean Kenneth Melvin | — | (714) 321 0369 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Deark E&c INC | Dong Keun Jin | info@dearkec.com | (714) 519 3484 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Deb Construction L L C | Scott Daniel Shellhammer | — | (714) 632 6680 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Debor | Momeny Amir | — | (949) 478 9323 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Decco Construction INC | David Wesley Eminhizer | — | (714) 273 1111 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Deck Process And Services INC | Raul Asenscio Mares | — | (714) 953 5125 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Declark Construction INC | Michael Dale De Clark | — | (714) 815 0293 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Deco Electric | Kevin Michael Duszynski | — | (714) 742 5945 | Electricians | Anaheim · Orange County | — | — |
| Deco Master Painting | Deco Master Painting | — | (562) 217 1254 | Windows, patio, painters | Fullerton · Orange County | — | — |
| Deco Painting | Youngjin Park | — | (714) 232 2636 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Decode Building INC DBA Built Renovation | Christopher Mehdi Naghibi | — | (714) 594 9740 | GC, remodel, ADU | Seal Beach · Orange County | — | — |
| Decor Cj's Painting | Decor Cj's Painting | — | (714) 492 3336 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Decor-n-tile | Mark Lee Spencer | — | (949) 502 3355 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Decorative Concrete Concepts INC | Daniel Delatorre Mora | — | (714) 474 8842 | Other | Anaheim · Orange County | — | — |
| Decorative Flooring & Finishes | Arturo Munoz | — | (714) 866 1114 | Other | Garden Grove · Orange County | — | — |
| Dedicated Circuit | Dedicated Circuit | — | (714) 337 6901 | Electricians | Stanton · Orange County | — | — |
| Dedicated Construction Services INC | Chad David Sorensen | — | (714) 330 6604 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Dedicated Electric | Eric Scott Sorensen | — | (949) 521 3535 | Electricians | Santa Ana · Orange County | — | — |