| Der Tischler INC | Arlo Lowell Iii Armstrong | — | (925) 457 6268 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Dereis Construction INC | Steven Paul De Reis | — | (510) 796 4743 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Derick G Watson | Derick G Watson | — | (408) 772 3220 | Other | Oakley · Contra Costa County | — | — |
| Design & Deliver Construction | Joseph Paul Jr Lyster | — | (925) 435 6494 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Design Landscape | Design Landscape | — | (925) 918 1789 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Designer Floors | Designer Floors | — | (925) 372 7288 | Other | Martinez · Contra Costa County | — | — |
| Desmond Rooney | Desmond Rooney | — | (415) 533 1100 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Destny68 Construction | Thynancy Luu Friday | — | (415) 424 2726 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Detail Painting INC | Rodriguez Jose De Jesus | — | (925) 522 1449 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Dettaglio Construction INC DBA Dci Construction | Todd Rene Di Martino | — | (925) 464 1570 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Devco Building Enterprises LLC | Devin Joel Grimes | — | (925) 448 2123 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| Devengenzo & Company | Nicholas Robert Devengenzo | — | (925) 930 7186 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Devil Dog Construction INC | Rodney Ryan Woodson | — | (925) 584 2531 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Devil Mountain Mechanical Services | Christian Michael Delamain | — | (925) 250 3147 | HVAC | Concord · Contra Costa County | — | — |
| Dfconceal LLC | Heather Lynn Borst | — | (847) 525 3960 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Dg Design Group Builders INC | Donald Edward Murphy | %20info@dgdesigngroup.com | (650) 823 3502 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Dg Plumbing | Dg Plumbing | daniel@dg-plumbing.com | (925) 510 1225 | Other | Clayton · Contra Costa County | — | — |
| Dha Mechanical INC | Delmis Frank Fernandez | ask@dhamechanical.com | (925) 425-2770 | HVAC | Brentwood · Contra Costa County | — | — |
| Dhr General Construction Corp | Justin Wayne Martinez | — | (925) 566 4397 | Other | Antioch · Contra Costa County | — | — |
| Diablo Boiler & Steam INC | Timothy Jay Clay | — | (925) 776 5089 | HVAC | Antioch · Contra Costa County | — | — |
| Diablo Built | Diablo Built | — | (925) 500 3689 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Diablo Concrete Removal | Diablo Concrete Removal | — | (925) 207 5805 | Other | Pittsburg · Contra Costa County | — | — |
| Diablo Custom Screen | Zi Ping Zhao | — | (925) 689 1100 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Diablo Delta Painting Co | Joseph Charles Mc Mindes | — | (925) 513 3244 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Diablo Excavation & Construction | Damian Baxter Moser-Service | — | (925) 628 8877 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Diablo Flooring INC | Brian Gary Deoliveira | — | (925) 314 9663 | Other | Danville · Contra Costa County | — | — |
| Diablo General Engineering Co | Frank Douglas Iv Lozano | — | (925) 676 9211 | Other | Pleasant Hill · Contra Costa County | — | — |
| Diablo Glass INC | Gary Joseph Sandoval | — | (925) 682 8271 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Diablo Home Improvement | Diablo Home Improvement | — | (925) 229 1920 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Diablo Iron & Fence INC | John David Hewatt | — | (925) 831 2555 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Diablo Lawnscape | Diablo Lawnscape | — | (925) 381 3757 | Windows, patio, painters | Clayton · Contra Costa County | — | — |
| Diablo Luxury Builders | Diablo Luxury Builders | — | (925) 768 3331 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Diablo Molding & Trim | Blumin Alex | — | (925) 525 5482 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Diablo Pacific Inc. | Diablo Pacific Inc. | — | (925) 979-5550 | Property managers | Walnut Creek · Contra Costa County | — | — |
| Diablo Range Construction | Matthew Morrow Ellison | — | (925) 634 8034 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Diablo Remodel | Diablo Remodel | — | (925) 768 4068 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Diablo Ridge Group INC | Steven Auster Meyerson | impallari@gmail.com | (925) 765 3871 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Diablo Roofing Service | Quintor-ramos Rogelio | — | (925) 481 2497 | Other roofers | Antioch · Contra Costa County | — | — |
| Diablo Rooter | Diablo Rooter | — | (925) 934 1944 | Other | Walnut Creek · Contra Costa County | — | — |
| Diablo Striping INC | Andrew James Thelwell | andrew@diablostriping.com | (925) 262 3001 | Other | Walnut Creek · Contra Costa County | — | — |