| Donald Hunsberger Construction | Donald Alec Hunsberger | — | (714) 856 7486 | GC, remodel, ADU | Orange · Orange County | — | — |
| Donald L Cox INC DBA Cox Construction | Donald Lee Cox | — | (714) 827 2334 | GC, remodel, ADU | Cypress · Orange County | — | — |
| Donald Lopez INC DBA Surface Tempo | Donal Rene Lopez Flores | — | (714) 425 6028 | Other | Irvine · Orange County | — | — |
| Donald Manthey | Donald Manthey | — | (714) 418 3545 | HVAC | Fountain Valley · Orange County | — | — |
| Donald Painting | Donald Painting | — | (714) 283 0405 | Windows, patio, painters | Orange · Orange County | — | — |
| Donald Patton Construction INC | Donald Wood Patton | — | (714) 444 2980 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Donald Povieng | Donald Povieng | — | (619) 520 2856 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Donald Sherman Electric | Donald Garrett Sherman | — | (562) 307 0827 | HVAC | San Clemente · Orange County | — | — |
| Donatelli's Construction INC | David Michael Donatelli | — | (800) 797 7329 | GC, remodel, ADU | Cypress · Orange County | — | — |
| Donco & Sons INC | Eleanor Diane Fink | — | (714) 779 0099 | Electricians | Anaheim · Orange County | — | — |
| Done Right Installation | Done Right Installation | — | (714) 225 3403 | Other | Orange · Orange County | — | — |
| Done Right Restoration LLC | Amber Lee Parker | — | (909) 436 9480 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Done Rite Roofing LLC | Robert Wayne Logan | — | (714) 232 1819 | Other roofers | Stanton · Orange County | — | — |
| Doninely's Remodeling INC | Noe De Jesus Doninely Gamez | — | (714) 756 9812 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Donlon Builders | Desmond Quinn Donnellan | info@donlonbuilders.com | (714) 528 0800 | GC, remodel, ADU | Brea · Orange County | — | — |
| Donnie Smith Enterprises | Donnie Jason Smith | — | (714) 639 2878 | Other | Anaheim · Orange County | — | — |
| Donssen Construction INC | Brandon Lurssen | — | (714) 497 3882 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dont Trip Electric | James Robert Okvist | info@donttripelectric.com | (949) 378 8538 | Electricians | Costa Mesa · Orange County | — | — |
| Door 1 Systems INC | Mark Joseph Siano | — | (714) 540 1645 | Other | Huntington Beach · Orange County | — | — |
| Door Crafters Of Irvine | Door Crafters Of Irvine | — | (949) 857 0766 | Other | Irvine · Orange County | — | — |
| Door Medics Entry Solutions INC | Manuel Francis Debarros | — | (714) 525 3667 | Other | Anaheim · Orange County | — | — |
| Door Pros | Jesse Dominique Evans | — | (714) 809 6054 | Other | Huntington Beach · Orange County | — | — |
| Door Systems INC | Jeff Gerard Bonnema | — | (714) 258 7100 | Other | Placentia · Orange County | — | — |
| Door Window And Glass Pros | Sergio Arteaga | — | (714) 932 7190 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Doorposh | Mohammed Said Elkhatib | — | (714) 369 3983 | Other | Anaheim · Orange County | — | — |
| Doortek Systems INC | Michael Anthony Peters | — | (714) 669 2771 | Other | Anaheim · Orange County | — | — |
| Doran Company | Christopher Peter Doran | — | (562) 833 9784 | GC, remodel, ADU | La Habra · Orange County | — | — |
| Dorantes Plastering INC | Manuel Feregrino Dorantes | — | (949) 289 5376 | Other | Garden Grove · Orange County | — | — |
| Dordoni Door & Hardware Installation | Dordoni Door & Hardware Installation | — | (949) 394 1375 | Other | Newport Beach · Orange County | — | — |
| Dore Michael Wolin | Dore Michael Wolin | — | (949) 322 1319 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Dorian's Works | Dorian's Works | — | (714) 322 7466 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dornan Construction | Derick Andrew Dornan | — | (714) 749 0888 | GC, remodel, ADU | Cypress · Orange County | — | — |
| Doron Waldman | Doron Waldman | — | (562) 335 5965 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Double A Landscape | Huacuz Abel Gutierrez | — | (714) 858 7822 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Double A&a Flooring | Antony O Sandoval Roblero | — | (949) 762 9443 | Other | Costa Mesa · Orange County | — | — |
| Double D Installation | Lee Allen Gravesen | — | (714) 630 3591 | Other | Orange · Orange County | — | — |
| Double D Painting | Double D Painting | — | (714) 458 2728 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Double E Electric | Eric Paul Clemson | — | (949) 456 9995 | Electricians | Foothill Ranch · Orange County | — | — |
| Double J Design INC | John Park | — | (213) 322 3880 | GC, remodel, ADU | La Habra · Orange County | — | — |
| Double O Plumbing & Drain Co | Ornelas Octavio | — | (714) 699 8673 | Other | Santa Ana · Orange County | — | — |