| D & E Plumbing INC | Danny Ray Bradford | — | (714) 974 4861 | Other | Orange · Orange County | — | — |
| D & G Construction Group INC | David Patrick Jones | — | (714) 531 6411 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| D & G Flooring INC | Michael Roger Flamme | — | (760) 559 0069 | Other | Fullerton · Orange County | — | — |
| D & G Rhodes Construction INC | Shari Marie Rhodes | — | (949) 282 4841 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| D & G Signs | D & G Signs | — | (714) 921 1425 | Other | Orange · Orange County | — | — |
| D & K Construction | Khanh D Nguyen | — | (408) 368 2222 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| D & M Painting INC | Dennis Edward Montgomery | — | (714) 997 4131 | Windows, patio, painters | Orange · Orange County | — | — |
| D & N Sealing Company | Norma Irene Abler | — | (714) 747 6095 | Other | Anaheim · Orange County | — | — |
| D & O Construction | Daniel Florin Oros | — | (714) 602 7365 | GC, remodel, ADU | Orange · Orange County | — | — |
| D & O Construction INC | Daniel Florin Oros | — | (714) 609 3433 | GC, remodel, ADU | Orange · Orange County | — | — |
| D & R Quality Coatings | D & R Quality Coatings | — | (949) 230 3683 | Windows, patio, painters | San Clemente · Orange County | — | — |
| D & S Construction Services INC | David Michael Landon | — | (714) 235 7720 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| D & S Plumbing Systems INC | Daniel Lynn Munson | — | (909) 703 0078 | Other | Yorba Linda · Orange County | — | — |
| D & V Electric INC | Mison Suh | — | (626) 677 7777 | Electricians | Fullerton · Orange County | — | — |
| D A Dietz Building Construction | David Anthony Dietz | — | (916) 799 1739 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| D A S Construction | David Alan Stambaugh | — | (714) 325 5920 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| D A Simmons Construction INC | David Arthur Simmons | — | (562) 889 2127 | GC, remodel, ADU | Seal Beach · Orange County | — | — |
| D A V General Construction | Valente Aguilar | — | (714) 769 9747 | GC, remodel, ADU | Orange · Orange County | — | — |
| D Air Balance INC | Richmond Tienphat Nguyen | — | (714) 588 9284 | HVAC | Midway City · Orange County | — | — |
| D Arthur Painting | D Arthur Painting | — | (949) 280 8063 | Windows, patio, painters | Laguna Beach · Orange County | — | — |
| D B A C INC | John Michael Curci | — | (949) 723 0147 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| D B Audio | D B Audio | — | (949) 514 1141 | Other | Fountain Valley · Orange County | — | — |
| D B C Associates INC | Bahng Jung Kyun | — | (714) 504 2881 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| D B Construction | Dustin Charles Bianchi | dave@dbconstruction.com | (714) 742 3535 | HVAC | Orange · Orange County | — | — |
| D B Painting Maintenance INC | Dario Ricardo Barbano | — | (949) 278 0793 | Windows, patio, painters | Laguna Niguel · Orange County | — | — |
| D B Sales & Service | Stephen Anthony Mertz | — | (714) 897 1036 | HVAC | Anaheim · Orange County | — | — |
| D B Services Pool And Spa Maintenance | Daniel Charles Bubert | — | (626) 290 2117 | Pool | Yorba Linda · Orange County | — | — |
| D C Coatings INC | Colin Daniel Stubblefield | — | (949) 705 7194 | Windows, patio, painters | Tustin · Orange County | — | — |
| D C Fire Protection | D C Fire Protection | — | (714) 309 0144 | Other | Midway City · Orange County | — | — |
| D C General Contracting | Coste Daniel | info@dcgeneralcontracting.com | (714) 675 5460 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| D C Installations | D C Installations | — | (714) 240 1101 | Electricians | Santa Ana · Orange County | — | — |
| D C Landscape Design | D C Landscape Design | — | (949) 342 6897 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| D C Landscapes | D C Landscapes | — | (562) 552 5561 | Windows, patio, painters | Seal Beach · Orange County | — | — |
| D C Mechanical | D C Mechanical | — | (714) 458 1137 | HVAC | Fountain Valley · Orange County | — | — |
| D C S Interiors INC | Matthew Wade Robison | — | (714) 589 4000 | Other | Buena Park · Orange County | — | — |
| D C Spriggs INC | David Clinton Spriggs | — | (714) 393 5685 | Electricians | Huntington Beach · Orange County | — | — |
| D C's Heating & Air Conditioning | Deborah Ann Purcell | — | (949) 770 9616 | HVAC | Laguna Hills · Orange County | — | — |
| D Drake Home Improvements | D Drake Home Improvements | — | (714) 932 3905 | GC, remodel, ADU | Placentia · Orange County | — | — |
| D E C S | D E C S | — | (714) 376 0270 | Electricians | Westminster · Orange County | — | — |
| D E Schottlander | D E Schottlander | — | (562) 243 4996 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |