| Dgl Air Conditioning & Heating INC | Donald Gene Loflin | — | (714) 279 9480 | HVAC | Orange · Orange County | — | — |
| Dgl Roofing INC | Lopez Delfino Garcia | — | (714) 728 5752 | Other roofers | Garden Grove · Orange County | — | — |
| Dgo Plumbing And Hydro Jet Services | Martin Paredes | — | (714) 933 0225 | Other | Anaheim · Orange County | — | — |
| Dh3 Surfacing INC | Donald Iii Haynes | — | (805) 988 1971 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Dhaval Panchal | Dhaval Panchal | — | (323) 835 1224 | GC, remodel, ADU | Cypress · Orange County | — | — |
| Dhs Security Systems INC | David Paul Holland | — | (714) 549 1090 | Alarm and generators | Costa Mesa · Orange County | — | — |
| Di Franco Stone Pro | Di Franco Stone Pro | — | (714) 448 1452 | Other | Fullerton · Orange County | — | — |
| Di Rock Gc INC | Mark Gregory Di Rocco | — | (949) 545 1976 | Other roofers | Rancho Santa Margarita · Orange County | — | — |
| Di-lar Industrial Supply INC DBA L J Hausner Const Co | Larry Joseph Hausner | — | (714) 544 3100 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Dial One Sonshine INC | Jonathan Dean Marquez | — | (714) 826 5198 | HVAC | Santa Ana · Orange County | — | — |
| Diamond Arborist Service | Benjamin Hannaniah Kent | — | (949) 689 6836 | Tree | Laguna Hills · Orange County | — | — |
| Diamond Concrete Cutting | Diamond Concrete Cutting | — | (714) 337 3327 | Other | Anaheim · Orange County | — | — |
| Diamond Construction & Design | Adrian Onufrei | — | (714) 240 3698 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Diamond Landscape Lighting | Diamond Landscape Lighting | — | (949) 294 8978 | Other | Santa Ana · Orange County | — | — |
| Diamond Painting O C INC | Daniel Yeon Kim | — | (714) 904 2009 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| Diamonds Sports Field Maintenance INC | Jeremy Scott Woolston | — | (949) 294 8916 | Windows, patio, painters | Trabuco Canyon · Orange County | — | — |
| Diane Knight | Diane Knight | — | (949) 422 0572 | Windows, patio, painters | Corona Del Mar · Orange County | — | — |
| Diane Renee Kelley | Diane Renee Kelley | — | (310) 559 3164 | GC, remodel, ADU | Orange · Orange County | — | — |
| Diaz Construction | Diaz Walter | — | (818) 471 0117 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Diaz Design And Remodel INC | Gilbert Christopher Diaz | — | (714) 878 7296 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Diaz General Engineering | Diaz General Engineering | — | (707) 656 8211 | Other | Huntington Beach · Orange County | — | — |
| Diaz Hrmns Construction | Juan Carlos Diaz | — | (714) 269 8436 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Diaz Landscaping | Diaz Landscaping | — | (562) 415 7488 | Windows, patio, painters | Orange · Orange County | — | — |
| Diaz Sign Services | Juan Higuera Diaz | — | (714) 925 4953 | Other | Santa Ana · Orange County | — | — |
| Diaz Top Roofing Services | Ever Enrique Diaz | — | (866) 828 1886 | Other roofers | Anaheim · Orange County | — | — |
| Dick Howell's Hole Drilling Service INC | Daniel Henrie Judge | — | (562) 633 9898 | Other | Garden Grove · Orange County | — | — |
| Dickenson Construction INC | Daniel John Dickenson | — | (949) 444 4734 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Dickman Construction INC | Steven James Dickman | — | (714) 829 9707 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Diego Gutierrez | Diego Gutierrez | — | (657) 633 2115 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Diego Soto | Diego Soto | — | (714) 423 9978 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Diego's Quality Construction | Diego Gerardo Lopez Rivera | — | (949) 354 9247 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| Diego's Roofing Corp | Morales Kennedy Diego | diegosroofingcorp@yahoo.com | (949) 903 3723 | Other roofers | Costa Mesa · Orange County | — | — |
| Diersing Electric | Daniel Joseph Diersing | — | (714) 749 5871 | Electricians | Anaheim · Orange County | — | — |
| Dietz Rj Landscape | Dietz Rj Landscape | — | (949) 899 5540 | Windows, patio, painters | San Clemente · Orange County | — | — |
| Difante Construction | Difante Agostino | — | (949) 422 2973 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Dig Landscape Construction INC | Eric Jay Fenmore | — | (949) 673 5450 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Digene Glass | Digene Glass | — | (949) 466 8627 | Windows, patio, painters | Lake Forest · Orange County | — | — |
| Digging Six Feet Under LLC | Christopher Peter Bassi | — | (949) 662 6406 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Diggity Grading | Diggity Grading | — | (714) 813 1999 | Other | Yorba Linda · Orange County | — | — |
| Digicom U S A | Manuel Gaerlan Jr Ong | — | (714) 494 4768 | Other | Yorba Linda · Orange County | — | — |