| Diverse Scape Pools & Spas INC | Armando Jr Garcia | — | (925) 431 9500 | Pool | Brentwood · Contra Costa County | — | — |
| Diverse Trade Services INC | Dennis Jay Jones | — | (925) 765 3982 | Other roofers | Concord · Contra Costa County | — | — |
| Divine Flow Plumbing INC | Hernan Felipe Herrera | — | (415) 525 0681 | Other | Richmond · Contra Costa County | — | — |
| Divino Landscape | Divino Landscape | — | (925) 765 3763 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Dixon Building Company | David Steven Dixon | — | (925) 565 9286 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Dj Construction | David Antonio Juarez Garcia | — | (925) 852 8703 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Dkm Electrical | Diosdado Kam Mejia | — | (510) 334 9380 | Electricians | Bay Point · Contra Costa County | — | — |
| Dl & Ce Mechanical INC | Ricardo Bravo-Gutierrez | — | (510) 415 5376 | HVAC | San Pablo · Contra Costa County | — | — |
| Dl Family Painting INC DBA Dl Painting | Delgado Ventura Armando | — | (925) 305 4264 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Dlt Plumbing INC | Jose De Jesus De La Torre | — | (510) 316 6807 | Other | Pittsburg · Contra Costa County | — | — |
| Dmmetals INC | Diego Saul Munguia Rodriguez | enquiry@dmmetals.com | (510) 688 1164 | Other | Richmond · Contra Costa County | — | — |
| Dmp General Contracting | David Monroe Pagano | — | (925) 464 0749 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Dms Construction | Damien Matthew Stopps | — | (925) 586 9533 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Dmytro Syvtsov | Dmytro Syvtsov | — | (510) 750 9178 | Electricians | Concord · Contra Costa County | — | — |
| Dmz Builders | Todd William Majors | contact@dmzbuilders.com | (925) 826 5387 | Electricians | Concord · Contra Costa County | — | — |
| Dmz/comstock Jv | K Comstock National Transit INC L | — | (925) 826 5387 | Electricians | Concord · Contra Costa County | — | — |
| Dna Garage Door INC | Paul Anthony Petralia | — | (408) 413 7751 | Other | Brentwood · Contra Costa County | — | — |
| Dna Renovations | Dna Renovations | — | (925) 988 0640 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Dnd-con Builders | Gonzalez Ruben Zepeda | — | (650) 468 4483 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Dndkb INC | David William Brady | — | (925) 899 6939 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Doan Vo Construction | Doan Van Vo | — | (510) 734 9176 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Doane Construction | Doane Mark | doaneconstruction@hotmail.com | (510) 892 7310 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Dobson Construction Incorporated | Christopher Conrad Dobson | — | (925) 595 1431 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Dogwood Construction | Thomas Neil Johnson | — | (925) 817 7700 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Doherty Thomas Construction INC | Thomas Hastings Doherty | — | (415) 572 5756 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Dolan Design | Dolan Design | pauldolan@dolandesign.com | (510) 326 6692 | Electricians | Orinda · Contra Costa County | — | — |
| Dolan's Heating & Air Conditioning | Dolan's Heating & Air Conditioning | — | (250) 723-4328 | HVAC | Concord · Contra Costa County | — | — |
| Domas Construction | Alexander Huy Do | — | (716) 866 4779 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Don Nelson Roofing | Donald Ivan Nelson | donnelson5@hotmail.com | (925) 837 5270 | Other roofers | Danville · Contra Costa County | — | — |
| Don Silva's Landscaping | Don Silva's Landscaping | — | (510) 685 5175 | Windows, patio, painters | Pinole · Contra Costa County | — | — |
| Don Whitney & Sons Tile | Donald Clay Whitney | — | (925) 525 5870 | Other | Brentwood · Contra Costa County | — | — |
| Donado Tree Services INC | Juan Ramon Donado | — | (925) 765 4064 | Tree | Concord · Contra Costa County | — | — |
| Donald J Moura Construction | Donald Joseph Moura | — | (925) 687 4421 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Donald L Davis Builders INC | Donald Leroy Davis | — | (925) 765 0997 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Donald Moresi | Donald Moresi | — | (925) 899 1755 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Donald Professional | Donald Professional | — | (510) 708 8893 | HVAC | Hercules · Contra Costa County | — | — |
| Donald Robert Bisagno | Donald Robert Bisagno | — | (925) 487 1860 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Donald T Larwood | Donald T Larwood | — | (925) 451 6104 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Donald Utley | Donald Utley | — | (925) 820 2345 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Donaldson Concrete Construction | Steve Craig Donaldson | — | (925) 766 2556 | Other | Oakley · Contra Costa County | — | — |