| D-one Builder & Design INC | Tran Teedee | — | (714) 883 3939 | GC, remodel, ADU | Westminster · Orange County | — | — |
| D/j Construction INC | Walfre Adirson Solis Reyes | — | (714) 715 3897 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| D/mark Corporation | Jay Emerson Davis | — | (562) 799 9010 | Other | Los Alamitos · Orange County | — | — |
| D2a Construction INC | Dan Naor | support@d2aconstruction.com | (949) 822 2322 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| D2x Build INC | William Mehdi Vassetizadeh | — | (949) 633 7280 | Electricians | Laguna Niguel · Orange County | — | — |
| D3 Development Group | Jeffrey Richard Dunn | wecare@d3developmentgroup.com | (714) 858 0656 | Electricians | Brea · Orange County | — | — |
| Dac Contractor INC | David Arthur Cuevas | — | (714) 202 5073 | GC, remodel, ADU | Orange · Orange County | — | — |
| Dacian Enterprise | Dacian Enterprise | info@dacianenterprise.com | (714) 234 0001 | Electricians | Anaheim · Orange County | — | — |
| Dad's Home Services & Construction INC | Daniel Arnold Derkum | — | (949) 380 0177 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Dae Sup Han | Dae Sup Han | — | (917) 862 1521 | HVAC | La Habra · Orange County | — | — |
| Dahn Corporation | Brian Austin Dahn | — | (949) 752 1282 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Dailan D Electric | Danh Kim Nguyen | — | (714) 767 0640 | Electricians | Santa Ana · Orange County | — | — |
| Dain Construction INC | Scott Alexander Dain | julie@dainconstruction.com | (310) 650 5200 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Daisy Painting INC | Nixia Alicia Garcia Monzon | — | (949) 332 9785 | Windows, patio, painters | Fullerton · Orange County | — | — |
| Dakota Plumbing INC | Justin Dale Wagoner | — | (949) 204 7556 | Other | Lake Forest · Orange County | — | — |
| Dalahoo | Mansoori Kamran | pr@dalahoo.com | (949) 656 6000 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Dalby Construction | Anthony Chase Dalby | — | (949) 244 9604 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Dale E Griffin Co DBA Griffin Contracting | Dale Edwin Griffin | — | (949) 619 6065 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| Dale M Lyon | Dale M Lyon | — | (949) 719 7221 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Dale R Winchell Construction INC | Dale Robert Winchell | — | (714) 915 9495 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Dale R Zimmermann DBA Dale's Remodeling | Dale's Remodeling | — | (714) 813 7699 | HVAC | Brea · Orange County | — | — |
| Dale Riley Construction | Dale L Riley | — | (714) 743 3411 | GC, remodel, ADU | Brea · Orange County | — | — |
| Dale's Crane Services INC | Phillip Eugene Dale | — | (909) 762 0908 | Other | Orange · Orange County | — | — |
| Dales Roofing INC | Lopez Javier C | — | (714) 534 6398 | Other roofers | Orange · Orange County | — | — |
| Daley Construction INC | Joshua Philip Daley | — | (424) 316 7234 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Dalton Plastering INC | Douglas Lee Dalton | — | (949) 498 8397 | Other | San Clemente · Orange County | — | — |
| Damato Associates INC DBA Dai General Contracting | Laurence Hall Damato | — | (949) 600 5850 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Dan Burge | Dan Burge | — | (949) 492 1175 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Dan Chambers Painting | Dan Chambers Painting | — | (714) 504 8281 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| Dan Chejoka Fire Protection | Dan Chejoka Fire Protection | — | (949) 247 9642 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Dan Chen | Dan Chen | — | (626) 420 6102 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Dan Construction | Lyu Dan | — | (626) 996 2977 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Dan Contractor | Dan Contractor | — | (562) 824 6129 | GC, remodel, ADU | Orange · Orange County | — | — |
| Dan Electric | Pripon Daniel | — | (714) 388 7022 | Electricians | Rancho Santa Margarita · Orange County | — | — |
| Dan Jacobson | Dan Jacobson | — | (714) 654 8144 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| Dan Johnson General Contractor | Dan Johnson General Contractor | — | (949) 498 7315 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Dan Kirtland | Dan Kirtland | — | (714) 863 1645 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| Dan L Lundberg | Dan L Lundberg | — | (949) 677 1183 | GC, remodel, ADU | El Toro · Orange County | — | — |
| Dan Luna INC | Daniel Ben Luna | — | (949) 859 3631 | Other | Laguna Hills · Orange County | — | — |
| Dan Miller Construction | Daniel Ross Miller | — | (714) 925 1294 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |