| Dse Creative Construction | Demetrio Hernandez | — | (949) 836 8797 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Dsm | Abdul Basit Khan | — | (213) 613 1302 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dss Street Sweeping INC | Fausta Ibarra | — | (949) 514 1627 | Other | Newport Beach · Orange County | — | — |
| Dt Construction Co | Dien Da Dinh | — | (714) 925 2539 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Dt Custom Homes | Dekel Tabibi | — | (949) 239 5273 | GC, remodel, ADU | Corona Del Mar · Orange County | — | — |
| Dtc Building | Tally Dave | — | (714) 308 3228 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Dtc Flooring INC | Derek Alan Tally | — | (714) 308 3977 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Dual Force Construction | Francisco Javier Gonzalez | — | (240) 625 2053 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Dualtech Solutions | Xilei Chen | — | (626) 695 3370 | HVAC | Irvine · Orange County | — | — |
| Duane L Chapman Construction Company | Duane L Chapman | — | (949) 292 7955 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Duarte Landscape INC | Eduardo Duarte | — | (714) 679 0117 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Duarte's Plastering | Omar Bacilio Duarte | — | (951) 588 9375 | Other | Garden Grove · Orange County | — | — |
| Duban's Garage Doors Corp | Roldan Balmore Rodriguez-Deras | — | (323) 747 6687 | Other | Santa Ana · Orange County | — | — |
| Dublin Oak Builders INC | Bryan Henley | — | (909) 806 5899 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Dubois Construction | Dubois Minhui | — | (714) 266 4595 | GC, remodel, ADU | Brea · Orange County | — | — |
| Ducat Electric | Randall Anthony Ducat | — | (714) 642 6250 | Electricians | Huntington Beach · Orange County | — | — |
| Ducros Electrical Contracting | Gary Paul Ducros | — | (714) 412 9835 | Electricians | Anaheim · Orange County | — | — |
| Ducros Electrical Contracting & Design INC | Gary Paul Ducros | — | (714) 688 7000 | Electricians | Anaheim · Orange County | — | — |
| Duda Plumbing INC | Duda Emilton | — | (714) 726 2118 | Other | Cypress · Orange County | — | — |
| Duff Tile & Stone | Duff Tile & Stone | — | (714) 321 2778 | Other | Orange · Orange County | — | — |
| Duk Soo Choi | Duk Soo Choi | — | (714) 287 7002 | Electricians | Irvine · Orange County | — | — |
| Duke Construction Services INC | Steven Wesley Duke | — | (562) 706 4996 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Duma Construction INC | Matthew Christopher Duma | — | (949) 870 7687 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Dumarc Corporation | Christopher Douglas Rikel | — | (714) 993 0909 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Dumore Electric | Gerry Gomez Perez | — | (714) 640 0148 | Electricians | Orange · Orange County | — | — |
| Dun-rite | Lee Irving Henseler | — | (949) 293 5423 | Other | Laguna Woods · Orange County | — | — |
| Duneside Pools INC | Trenton Marion Brumfield | — | (949) 408 8062 | Pool | Huntington Beach · Orange County | — | — |
| Dung Duc Vu | Dung Duc Vu | — | (714) 675 1310 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Dung Khac Do | Dung Khac Do | — | (714) 308 4683 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Dung Van Dong | Dung Van Dong | — | (714) 823 0519 | GC, remodel, ADU | Westminster · Orange County | — | — |
| Dunn - Rite Heating & Air | Douglas Roland Westmyer | — | (714) 534 2800 | HVAC | Garden Grove · Orange County | — | — |
| Dunn Right Electrical | Kevin William Dunn | — | (714) 723 6846 | Electricians | Cypress · Orange County | — | — |
| Dunning Development Renovations | Dunning Development Renovations | — | (949) 422 7522 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Dunsmore Building Painting Service | David Dunsmore Sanchez | — | (714) 628 3939 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Dupre Enterprises | Eric Martin Dupre | — | (714) 718 2100 | Electricians | Garden Grove · Orange County | — | — |
| Durable Painting | Durable Painting | — | (714) 906 0104 | Windows, patio, painters | Rancho Santa Margarita · Orange County | — | — |
| Duracon Development INC | Kevin Gyu| Hwang Gyu Howa Hwang | — | (714) 309 2235 | GC, remodel, ADU | La Habra · Orange County | — | — |
| Duradek / Durarail Systems INC | David Preston Richey | — | (949) 218 9989 | Windows, patio, painters | San Juan Capistrano · Orange County | — | — |
| Duran Landscaping | Duran Javier Zabaleta | — | (714) 860 5161 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Durborow Construction | Christopher James Durborow | — | (949) 933 3221 | GC, remodel, ADU | Newport Beach · Orange County | — | — |