| Day-town Builders Group INC | Michael Anthony Dunn | — | (510) 426 8514 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Daykin Electric | Jeffrey Gerald Daykin | — | (925) 778 5816 | Electricians | Antioch · Contra Costa County | — | — |
| Daymar Electric INC | Mariano Antonio Rodriguez | — | (415) 240 6480 | Electricians | San Pablo · Contra Costa County | — | — |
| Db General Construction | Delfino Edgardo Barrios Rodas | — | (650) 515 5650 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Db Network Consulting INC | Claudia Angelica Waters Ruiz | — | (310) 703 4789 | Electricians | Discovery Bay · Contra Costa County | — | — |
| DBA Screens Of Northern California | Sean Edward Calvey | — | (925) 521 5600 | Other | Concord · Contra Costa County | — | — |
| Dc Demo And Excavation | Tana Kirkhuff Coulter | — | (510) 207 2479 | Other | Richmond · Contra Costa County | — | — |
| Dcc Construction LLC | Dustin Jon Cromwell | — | (925) 433 3250 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Dcg Painting | Dcg Painting | — | (510) 478 6983 | Windows, patio, painters | Crockett · Contra Costa County | — | — |
| De Fremery Construction | John Joseph De Fremery | — | (925) 584 1343 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| De Group Roofing And Waterproofing Corporation | Inocencia Garcia De Garcia | hello@degroupusa.com | (925) 940 7099 | Other roofers | Walnut Creek · Contra Costa County | — | — |
| De Lima Building Services | Edival Barbosa De Lima | — | (510) 366 8474 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| De Lira Concrete Corporation | Andy Gamaliel Delira | info@deliraconcrete.com | (925) 584 2575 | Other | Pittsburg · Contra Costa County | — | — |
| De Maravilla Tile | De Maravilla Tile | — | (925) 597 1502 | Other | Antioch · Contra Costa County | — | — |
| De Murillos Painting | Victor Murillo | — | (510) 219 3173 | Windows, patio, painters | Crockett · Contra Costa County | — | — |
| De Nova Homes INC | David Bruce Sanson | — | (925) 685 0110 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| De Painting | De Painting | — | (925) 754 9845 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Dean Osborne Flooring | Dean Osborne Flooring | — | (925) 778 2191 | Other | Antioch · Contra Costa County | — | — |
| Dean's Acoustical Ceilings INC | Terri Lyn Lasher | — | (925) 634 2243 | Other | Brentwood · Contra Costa County | — | — |
| Decade Construction | Robert James Leitz | — | (925) 864 2907 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Decesaris Mechanical Services | Mario Alcantar Decesaris | — | (510) 798 1317 | HVAC | Martinez · Contra Costa County | — | — |
| Dechaunte Lamar Wilson | Dechaunte Lamar Wilson | — | (510) 875 9582 | Electricians | Antioch · Contra Costa County | — | — |
| Deck Man General Construction | Sandoval Hernandez Fernando | — | (415) 845 6374 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Decorayal Remodeling INC | Wilson Javier Ayala Penaloza | — | (925) 580 2739 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Decotech Systems INC | Nathan Alan Burkhardt | — | (925) 954 1520 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Deemer Development | Deemer Development | — | (510) 701 1052 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Deepali Pallath | Deepali Pallath | — | (628) 213 9960 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Defensible Space And Tree Service | Timothy Edgar Opdycke | — | (925) 980 8937 | Tree | Orinda · Contra Costa County | — | — |
| Defentec Security | Phil Albert| Joseph Phillip Albert Joseph | — | (925) 838 8444 | Electricians | San Ramon · Contra Costa County | — | — |
| Dei Monti INC | Jack Attilio Jr Del Monte | — | (925) 381 7555 | HVAC | Pittsburg · Contra Costa County | — | — |
| Deignan Painting | Deignan Painting | — | (925) 988 8894 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Del ""does"" Pools Service And Maintenance INC | Delbert Miller | — | (209) 814 2511 | Pool | Martinez · Contra Costa County | — | — |
| Del Carpio Construction | Oscar Joaquin Del Carpio | — | (925) 966 5317 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Del Does Pools Service And Maintenance | Miller Delbert | — | (209) 814 2511 | Pool | Martinez · Contra Costa County | — | — |
| Del Monte Mechanical INC | Jack Attilio Iii Del Monte | impallari@gmail.com | (925) 584 6694 | HVAC | Antioch · Contra Costa County | — | — |
| Del Oso Electric INC | Jorge Haroldo Jr Osorio | — | (510) 467 4554 | Electricians | Pittsburg · Contra Costa County | — | — |
| Delamar Construction Corp | Dechaunte Lamar Wilson | dechaunte69@yahoo.com | (510) 875 9582 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Delaney Controls & Instrumentation | Delaney Controls & Instrumentation | — | (510) 815 4312 | Electricians | Point Richmond · Contra Costa County | — | — |
| Delber's Landscaping Services | Delber Noel Guardado | delberguardado@yahoo.com | (415) 583 6768 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Delgadillo Landscaping | Delgadillo Landscaping | — | (925) 628 9444 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |