| Diversified Waterscapes INC | Patrick Alexander Simmsgeiger | — | (949) 582 5414 | Windows, patio, painters | Laguna Niguel · Orange County | — | — |
| Divine Amulet Painting INC | Claudia Yaresly Gomez | — | (714) 249 3515 | Windows, patio, painters | Irvine · Orange County | — | — |
| Divine Door Works | Divine Door Works | — | (562) 337 6244 | Other | La Habra · Orange County | — | — |
| Divine Powerline Electric | Eric James Mckenna | — | (714) 270 4258 | Electricians | Garden Grove · Orange County | — | — |
| Division 8 Hardware | Michael Anthony Ebel | — | (949) 433 8965 | Other | Rancho Santa Margarita · Orange County | — | — |
| Divita Builders INC | David Lawrence Wojtaszek | — | (949) 280 4091 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Dj Cole INC DBA Duke Cole & Associates | Duke William John Cole | — | (800) 945 3921 | Electricians | Fullerton · Orange County | — | — |
| Djf Coastal Construction | Edward Gregory Finkbeiner | — | (949) 613 6091 | GC, remodel, ADU | Laguna Beach · Orange County | — | — |
| Djm Construction Co INC | Rudy Jess Porras | — | (714) 399 3640 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Dk Painting Oc INC | Brysen Kole Wells | — | (714) 200 5121 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Dkh Construction Remodeling INC | Dawn Kailey Hess | — | (562) 927 8045 | GC, remodel, ADU | Placentia · Orange County | — | — |
| Dlc Best Electric INC | Jose Vianey De La Cruz Ocampo | — | (949) 374 4282 | Electricians | Dana Point · Orange County | — | — |
| Dlm Construction | Darryl Lee Mitchell | — | (714) 801 1461 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Dlrm Sys INC DBA Rm Systems | David Kenneth Lanham | — | (714) 984 1206 | Electricians | Placentia · Orange County | — | — |
| Dm Management Services | Danielle Rose Marquardt | — | (949) 231 2090 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Dm Plumbing & Sewer Service | Santana David Martinez | — | (714) 642 6649 | Other | Fullerton · Orange County | — | — |
| Dm2 Ventures LLC | Danny Randall Mak | — | (424) 977 9194 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Dma Builders LLC | David Michael Abbass | — | (315) 286 4827 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Dma Electric | Mohamed Abdelrahim | dmaelectric@outlook.com | (949) 414 9507 | Electricians | Laguna Niguel · Orange County | — | — |
| Dmc | Dino Nicholas Candelaria | — | (714) 674 0280 | Other | Brea · Orange County | — | — |
| Dmc Construction | Mai David | — | (657) 346 2011 | GC, remodel, ADU | Westminster · Orange County | — | — |
| Dmg Sc LLC | Roman Isaac Zaretsky | — | (562) 692 1277 | HVAC | Orange · Orange County | — | — |
| Dmh Painting | Hernandez David Mendoza | — | (714) 747 6527 | Windows, patio, painters | Orange · Orange County | — | — |
| Dmk Construction | Steven Victor Du Cros | — | (949) 932 0251 | Electricians | Irvine · Orange County | — | — |
| Dmr | Michael George Rudar | — | (714) 379 0011 | Other | Westminster · Orange County | — | — |
| Dms Building Maintenance INC DBA Dms Construction Clean Up | Jon Albert Deyan | — | (714) 996 8400 | Other | Placentia · Orange County | — | — |
| Dn Electric | Duy Quang Nguyen | — | (714) 423 9026 | Electricians | Anaheim · Orange County | — | — |
| Dna Overhead Doors INC | Dorian Durnham Lewis | — | (562) 686 9756 | Other | Cypress · Orange County | — | — |
| Dnc Construction INC | Johnny Heesuk Moon | — | (562) 824 0737 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Do Builder & Design INC | Angie Khiet Luu | — | (714) 847 3456 | HVAC | Fountain Valley · Orange County | — | — |
| Do It Electric | Timothy John Adams | — | (949) 466 1197 | Electricians | Newport Beach · Orange County | — | — |
| Do It Right Construction A Partnership | Ralph David Batsel | — | (714) 213 8988 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Do It Right Construction INC | Jeffrey Scott Miller | — | (714) 894 6329 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Do It Right Plumbers INC | Bar-lev Edan | — | (714) 733 7121 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Do My Best Painting | Joseph Jaeheung Ahn | — | (714) 315 4188 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Do Right Construction Co | Hyong Son Choe | — | (818) 269 7072 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Do's Air Conditioning And Refrigeration | Do's Air Conditioning And Refrigeration | — | (714) 728 7439 | HVAC | Garden Grove · Orange County | — | — |
| Doan Construction Services | Bruce Chuong Doan | — | (714) 837 3027 | HVAC | Garden Grove · Orange County | — | — |
| Doan's Construction | Charlie Doan | — | (805) 216 4599 | Electricians | Anaheim · Orange County | — | — |
| Dobbs Construction | George Michael Dobbs | — | (949) 735 0638 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |