| Done Right Plumbing INC | John Peter Marrone | — | (925) 743 8889 | Other | Alamo · Contra Costa County | — | — |
| Donisi Landscape Construction | Luca Emilio Donisi | — | (925) 935 1119 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Donpedro's General Construction Co | George Da Don-pedro | — | (510) 465 3111 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Doors Done Right Construction | Jeff Scott Spencer | — | (925) 787 3847 | Other | Concord · Contra Costa County | — | — |
| Dopro Construction INC | Olga Dotter | doitpro.office@gmail.com | (925) 445 7746 | Other roofers | Pleasant Hill · Contra Costa County | — | — |
| Double A Electrical Services INC | Castro Aaron Avila | — | (510) 689 4633 | Electricians | Richmond · Contra Costa County | — | — |
| Double G Plumbing | Double G Plumbing | — | (415) 928 9573 | Other | Richmond · Contra Costa County | — | — |
| Double H Drywall INC | Kristopher Russell Hildebrant | — | (925) 768 4878 | Other | Martinez · Contra Costa County | — | — |
| Double M Painting Co | Marc William Mackey | — | (510) 860 3788 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Double T Construction | Trent Antonio Travalini | — | (510) 812 3698 | GC, remodel, ADU | Rodeo · Contra Costa County | — | — |
| Doug Gourley Building Contractor | Doug Gourley Building Contractor | — | (510) 243 7445 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Doug's Plumbing | Doug's Plumbing | — | (925) 323 1194 | Other | Martinez · Contra Costa County | — | — |
| Douglah Designs Holdings LLC | Dustin Lee Nystrom | — | (925) 940 9150 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Douglah Designs INC | Leila Douglah | hello@douglahdesigns.com | (925) 284 4560 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Douglas Construction | Benjamin Douglas Smith | — | (925) 349 3354 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Douglas Gilbert Ellison Construction Company | Douglas Gilbert Ellison | — | (925) 698 5098 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Douglas M Brandeburg | Douglas M Brandeburg | — | (925) 548 7346 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Douglas Steen Construction | Douglas Paul Steen | — | (925) 305 9048 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Dovetail Development | Dovetail Development | info@dovetail-development.com | (925) 939 9022 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Down To The Wire Electric LLC | Miguel Gomez | — | (925) 698 8940 | Electricians | Concord · Contra Costa County | — | — |
| Doyle Heaton | Doyle Heaton | — | (925) 939 3473 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Dpg Outdoor Living | David Paul Garcia | — | (925) 239 5645 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Dr Building Company | Ramirez Dante Ricardo | — | (415) 879 1166 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Dr Hood Material Handling LLC | Larry Joseph Gomez | — | (925) 817 9489 | Other | Lafayette · Contra Costa County | — | — |
| Dr Roofing Company | Douglas Wosvely Ramos Aparicio | — | (510) 833 3979 | Other roofers | Antioch · Contra Costa County | — | — |
| Dr Wattz Electric | Robert Keith Gochenouer | — | (925) 595 6518 | Electricians | Antioch · Contra Costa County | — | — |
| Dracom | Baban Drazen | — | (510) 750 2524 | Other | Concord · Contra Costa County | — | — |
| Dracom INC | Drazen Baban | — | (510) 750 2524 | Other | Concord · Contra Costa County | — | — |
| Drain Doctors And Plumbers | Drain Doctors And Plumbers | — | (925) 778 8448 | Other | Antioch · Contra Costa County | — | — |
| Drain Guardians INC | Colby Jacob Odom | — | (925) 510 3157 | Other | Pacheco · Contra Costa County | — | — |
| Drainman Pro INC | Roxann Louise Nuku | office@drainmanpro.com | (925) 688 2365 | Other | Antioch · Contra Costa County | — | — |
| Dream Bath Of California LLC | Joshua David Pepper | — | (925) 501 0016 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Dream Big Construction | Travis Lee Johnson | — | (925) 382 5415 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Dream Big Drywall INC | Espinoza Javier Cruz | — | (925) 334 2304 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Dream Castle Construction & Remodeling | Vitenberg Edward | — | (408) 898 0113 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Dream Design Builders INC | David Paul Daniels | — | (925) 788 8666 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Dream Designs Development | Dream Designs Development | — | (650) 380 7391 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Dream Home Innovations INC | Brian Ivan Bancalari Santos | — | (925) 428 9198 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Dream Homes By Avalon Bay Construction | Robert Alfred Smith | — | (925) 570 0676 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Dream Plumbing & Rooter LLC | Shrestha Krishna | — | (510) 362 1097 | Other | Richmond · Contra Costa County | — | — |