| D & D Constructors INC | Chris Michael Devette | bryantdowning@gmail.com | (925) 250 1989 | Electricians | San Ramon · Contra Costa County | — | — |
| D & D Crawford INC | David Lynn Crawford | — | (510) 758 1445 | Other | Pinole · Contra Costa County | — | — |
| D & D Learning Spaces | Dean Howard Smith | info@ddlearningspaces.com | (925) 286 8718 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D & D Painting Co | Dionysios Panagiotis Panagiotopoulos | don@ddpainting.com | (415) 601 6907 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| D & E Concrete INC | Castillo Daniel Sanchez | — | (925) 238 5488 | Other | Antioch · Contra Costa County | — | — |
| D & E Construction | Daniel Omar Cabrera | — | (510) 334 2304 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| D & T Structural Steel INC | Timothy Vincent Twomey | — | (415) 378 7551 | Other | Orinda · Contra Costa County | — | — |
| D A B R A Construction | Dany Brayan Pino Martinez | — | (925) 325 1098 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| D A Mc Cosker Construction Co DBA Independent Construction | Mark Alan Chaddock | — | (925) 686 1780 | Other | Concord · Contra Costa County | — | — |
| D And E Construction Ltd | Daniel Omar Cabrera | — | (510) 334 2304 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| D B 98 | D B 98 | — | (510) 230 9208 | Other | San Pablo · Contra Costa County | — | — |
| D B Electric | Blazevic Dario | — | (925) 250 7213 | Electricians | Martinez · Contra Costa County | — | — |
| D B S J Flooring | D B S J Flooring | — | (925) 260 5824 | Other | Martinez · Contra Costa County | — | — |
| D B Works Construction | Daniel James Bosset | — | (925) 980 6044 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| D Bradley General Contractor | D Bradley General Contractor | — | (510) 232 3260 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| D C Adams Construction | Douglas Carlton Adams | — | (925) 584 7646 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| D C Construction | Dustin Jon Cromwell | — | (925) 326 8621 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D C Construction | Don Jason Cagle | — | (925) 783 7215 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| D C D Fabrication INC | David Christopher Wager-Smith | — | (510) 455 9000 | Other | Crockett · Contra Costa County | — | — |
| D D Build Construction INC DBA Wildfire Design & Build | Jeffrey Scott Goodrich | — | (949) 813 1998 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| D E K Electric Co | David Alan Partain | info@dekelectric.com | (925) 679 1649 | Electricians | Brentwood · Contra Costa County | — | — |
| D E N Builders | D E N Builders | — | (925) 522 6339 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| D G G Heating And Air Conditioning | David Giddings Goodman | — | (925) 684 2716 | HVAC | Bethel Island · Contra Costa County | — | — |
| D H C | D H C | — | (925) 216 7145 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| D H Construction | Dean Addington Henry | — | (925) 787 9561 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| D Hill | D Hill | — | (925) 413 5937 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| D J R Construction Services | Dennis John Roda | — | (925) 260 6077 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| D K Environmental | David Duncan Mc Nabb | — | (925) 930 8600 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| D K M Builders INC | Daniel Curtis Miks | — | (925) 768 3765 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| D K Miles INC DBA The Paintmasters | David Kevin Miles | — | (925) 370 8089 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| D L B Construction | Dennis Lynn Bowersmith | — | (925) 634 9799 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| D L C Concrete | D L C Concrete | — | (510) 867 4978 | Other | El Sobrante · Contra Costa County | — | — |
| D L Construction | Liang Da Lin | — | (415) 577 1324 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| D L Home Improvements | D L Home Improvements | — | (209) 815 7528 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| D L I Construction | Daniel Lee Cochran | — | (925) 389 6149 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| D L M Construction | Garcia Daniel | — | (925) 719 2938 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D L R Electric | Dennis Lee Reeves | rob@dlrelectric.com | (306) 737-4453 | Electricians | Walnut Creek · Contra Costa County | — | — |
| D Lr Bay Area Construction | Leon David | — | (510) 371 1914 | GC, remodel, ADU | Byron · Contra Costa County | — | — |
| D M C Development | D M C Development | david.mai@dmcdevelopment.com | (925) 683 7221 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D M Construction | Raphael Hernando Rojas | — | (925) 212 6957 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |