| Day Electrical Services INC | John Charles Jr Day | — | (562) 916 6171 | Electricians | Huntington Beach · Orange County | — | — |
| Day Star Fixtures INC | Dan Russell Prigmore | — | (714) 838 4613 | Other | Tustin · Orange County | — | — |
| Day-lite Maintenance Company INC | Richard Timothy Walworth | — | (714) 634 3811 | Electricians | Orange · Orange County | — | — |
| Daystar Builders INC | Joel Marvin Wolfer | — | (949) 728 0888 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Db Contractors INC | Daniel Min Baek | — | (562) 833 2238 | HVAC | Cypress · Orange County | — | — |
| Db Media Services LLC | Daniel Ian Burdett | — | (949) 484 9326 | Other | Laguna Hills · Orange County | — | — |
| Db Plumbing | Db Plumbing | — | (714) 735 8617 | Other | Buena Park · Orange County | — | — |
| Db Telecommunications | Db Telecommunications | dbtelecomm@att.net | (626) 264-7736 | Electricians | Garden Grove · Orange County | — | — |
| Dbm Rooter And Plumbing INC | Mora Daniel Breton | — | (949) 836 7441 | Other | Santa Ana · Orange County | — | — |
| Dc Building Solutions | Dc Building Solutions | — | (844) 254 6382 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Dc Construction Empire Corporation | David Don Palmer | — | (949) 669 8550 | GC, remodel, ADU | Coto De Caza · Orange County | — | — |
| Dc Construction Management Team | Jessica Lynn Jensen | — | (949) 742 8586 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Dc Construction Services | Dennis Paul Culver | — | (760) 715 9438 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Dc Current Demand INC | Canseco Fabian Anzures | — | (714) 910 3641 | Electricians | Santa Ana · Orange County | — | — |
| Dc Door Incorporated | Douglas Scott Cable | — | (714) 823 3080 | Other | Orange · Orange County | — | — |
| Dc Flooring | Dc Flooring | — | (714) 319 9575 | Other | Garden Grove · Orange County | — | — |
| Dc Lath And Plaster | Dc Lath And Plaster | — | (949) 290 1625 | Other | San Clemente · Orange County | — | — |
| Dcac Power | Dcac Power | info@dcacpower.com | (323) 746 8942 | Electricians | Anaheim · Orange County | — | — |
| Dci Legacy | Brett Steven Dapena | — | (949) 395 1621 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Dcl General Contractor | Dcl General Contractor | — | (949) 300 9527 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Dcm Plumbing Contractors INC | Devin Christian Molina | — | (714) 478 0754 | Other | Costa Mesa · Orange County | — | — |
| Dcmb Builders INC | Dennis Arthur Cunningham | — | (760) 578 0181 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Dcre8tions Flooring Installations INC | Daniel Dominguez-Rosete | — | (949) 942 7275 | Other | Los Alamitos · Orange County | — | — |
| Dcs Dock & Door Systems INC | Leon Guillermo Villanueva | — | (855) 327 4400 | Other | Santa Ana · Orange County | — | — |
| Dcs Plastering INC | David Patrick Schutte | — | (714) 632 7004 | Other | Anaheim · Orange County | — | — |
| Dct Construction | Santiago Vicente Larrea | — | (714) 307 1148 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Dct Windows & Glass Doors | Alex William Gonzalez | — | (949) 364 1988 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Dcw Signature Homes | David Christopher Wavro | — | (949) 230 9422 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Ddc Interiors | Ivan G Jr Speer | — | (949) 600 5850 | Other | San Juan Capistrano · Orange County | — | — |
| De - Tool Time INC | Efrain Iglesias Sandoval | — | (714) 240 5014 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| De Colores Painting | De Colores Painting | — | (714) 605 8555 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| De Haan Industries | De Haan Industries | — | (714) 235 6506 | Electricians | Costa Mesa · Orange County | — | — |
| De Investment LLC | Chih Chun Huang | name@beispiel.com | (626) 999 7350 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| De Jong Air Conditiong & Heating | Edward Robert De Jong | — | (714) 863 2710 | HVAC | Mission Viejo · Orange County | — | — |
| De La O Painting INC | Mario Alberto De La O Ruiz | — | (714) 905 3822 | Windows, patio, painters | Fountain Valley · Orange County | — | — |
| De La Puente Windows And Doors | Steven Thomas Puente | — | (714) 749 0085 | Windows, patio, painters | Fountain Valley · Orange County | — | — |
| De La Riva Construction INC | Joe J De La Riva | — | (714) 871 9561 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| De La Rocha Cabinets | De La Rocha Cabinets | — | (562) 691 2322 | Other | La Habra · Orange County | — | — |
| De La Rosa Brothers Construction Co INC | William Joseph De La Rosa | — | (562) 691 2539 | GC, remodel, ADU | La Habra · Orange County | — | — |
| De La Rosa Maintenance Contractors INC | Jack Vincent Hale | — | (949) 502 3710 | GC, remodel, ADU | Irvine · Orange County | — | — |