| D M J Electric INC | Juan Carlos Escobar | — | (925) 220 0478 | Electricians | Bay Point · Contra Costa County | — | — |
| D M R Electric INC | David Michael Reed | — | (925) 478 4045 | Electricians | Concord · Contra Costa County | — | — |
| D N Heating & Air Conditioning | Navarrete Ponce David | — | (925) 289 2977 | HVAC | Bay Point · Contra Costa County | — | — |
| D N S Electric | Sean Edward Birney | — | (925) 672 4868 | Electricians | Concord · Contra Costa County | — | — |
| D P L Construction | David Petrisor Laurentiu | — | (925) 457 4637 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D P Plumbing | D P Plumbing | — | (510) 289 0648 | Other | Antioch · Contra Costa County | — | — |
| D R B Construction INC | Derl Ray Ii Brown | — | (925) 349 4476 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D R C | D R C | — | (925) 548 2107 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| D R Construction | Diego Armando Rojas Castro | — | (925) 339 4693 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| D R G Builders INC | Doyle Del Heaton | — | (925) 939 3473 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| D R Horton America's Builder | David Matthew Trevillyan | — | (925) 225 7400 | Builders | San Ramon · Contra Costa County | — | — |
| D R Lemings Construction Company | Donald Ray Lemings | — | (925) 672 5600 | Other | Concord · Contra Costa County | — | — |
| D R Thompson Const | D R Thompson Const | — | (925) 229 9798 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| D S Castro INC DBA Horizon Construction Company | David Scott Castro | — | (925) 521 9300 | Other | Clayton · Contra Costa County | — | — |
| D S S Construction | Dante Samson Serzo | — | (361) 438-0820 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| D Squared Construction | Dan Ciprian Duculescu | — | (510) 289 9860 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D V Tile Stone | Vasile Asandei | — | (925) 914 9093 | Other | Pleasant Hill · Contra Costa County | — | — |
| D W Flooring | D W Flooring | — | (925) 381 2413 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| D W M Landscape | D W M Landscape | — | (925) 787 8305 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| D W Young Construction Company INC | Christian William Young | chris@dwyoung.com | (925) 743 1536 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| D Winn Painting Incorporated | David Rosendo Jr Winn | — | (925) 754 9768 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| D X J Concrete And Landscape | Jose Ursulo Gonzalez | — | (925) 494 4420 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| D'ambrosio Construction | Dominic Sebastian D'ambrosio | — | (925) 998 3340 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| D'carmo Interlocking Pavers INC | Renato Martins Do Carmo | — | (510) 860 8710 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| D. Garcia's Landscaping Inc. | Dayan Eymard Garcia Campbell | astigma@astigmatic.com | (510) 620 4339 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| D4 Development INC | Todd Rene Di Martino | — | (925) 570 1599 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Dabri INC | Singh Charanjeet | — | (415) 839 8142 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Dad's Best Handyman Services | Bona Nkosi Nsiala | — | (925) 497 9802 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Daggett & Sons Electric INC | Jeffery Allen Daggett | — | (925) 580 9249 | Electricians | Brentwood · Contra Costa County | — | — |
| Dahl - Beck Electric Company | Roger Wendel Beck | sales@dahlbeckelectric.com | (510) 237 2325 | Electricians | Richmond · Contra Costa County | — | — |
| Dahme Construction | Darrin Dwight Sr Dahme | — | (925) 229 8342 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Daigle And Sons Painting | Daigle And Sons Painting | — | (510) 206 5540 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Dale Allen Myer | Dale Allen Myer | — | (925) 685 5425 | Electricians | Concord · Contra Costa County | — | — |
| Dale Swirsding DBA Swirsding's Floor Service | Dale Robert Swirsding | — | (510) 853 1414 | Other | Richmond · Contra Costa County | — | — |
| Dan Braudrick Services INC | Daniel Joseph Braudrick | — | (925) 513 0328 | Other | Brentwood · Contra Costa County | — | — |
| Dan Carden Concrete | Dan Carden Concrete | — | (925) 997 5648 | Other | Oakley · Contra Costa County | — | — |
| Dan Construction | Dragomir Danut | — | (510) 384 3963 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Dan Garth Phillips | Dan Garth Phillips | — | (925) 584 9846 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Dan Gomes Construction | Daniel William Jr Gomes | — | (925) 212 5362 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Dan Longacre DBA Longacre Electric | Dan Alan Longacre | — | (925) 584 6079 | Electricians | Antioch · Contra Costa County | — | — |