| R G M And Associates | Ralph James Caputo | — | (925) 671 7717 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| R G M Builders INC | Ruben Gonzalez-Moctezuma | — | (925) 352 7964 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| R G Self Construction | Ronald Glenn Self | — | (925) 798 9555 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| R H D Masonry | R H D Masonry | — | (925) 787 9338 | Other | Concord · Contra Costa County | — | — |
| R H L Construction Company | Li Ronghui | — | (510) 652 6898 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| R H Nisthal Paint Company | Rene Herrera Nisthal | — | (925) 250 3427 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| R H R Construction | Hernandez-rivera Rogelio | — | (510) 417 0964 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| R H Tile Company INC | Ronald Melvin Hagen | ron@rhtile.com | (925) 963 0505 | Other | Brentwood · Contra Costa County | — | — |
| R J Construction | Willie Randolph Jackson | — | (323) 304 1279 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| R J D Mechanical And Construction INC DBA All Green Systems Go | Robert Joseph Dowdall | — | (925) 284 3695 | HVAC | Lafayette · Contra Costa County | — | — |
| R J Electric | Ronald Otto Schuster | — | (925) 584 7924 | Electricians | Antioch · Contra Costa County | — | — |
| R J Framing Construction | Ruiz Jesus | — | (925) 726 5535 | Other | Concord · Contra Costa County | — | — |
| R J Gordon Construction INC | R J Gordon Construction INC | — | (925) 680 8660 | Other | Pleasant Hill · Contra Costa County | — | — |
| R J Reynolds Ag Distributors INC | Richard Jerel Reynolds | — | (510) 334 4711 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| R L Electric | Robert Lee Walker | — | (925) 998 1865 | Electricians | Brentwood · Contra Costa County | — | — |
| R L Pollock | R L Pollock | — | (510) 292 7982 | Other | El Cerrito · Contra Costa County | — | — |
| R L W Construction | Richard Louis Webb | — | (925) 356 1712 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| R L Ziegenbein Construction INC | Ronald Leroy Ziegenbein | — | (925) 820 9245 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| R M C Electric | Rudy Christopher Moran-cruz | — | (415) 559 9571 | Electricians | Richmond · Contra Costa County | — | — |
| R M Construction | Raymond Joseph Mohun | — | (650) 391 7903 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| R M J Concrete | R M J Concrete | — | (925) 207 4593 | Other | Pittsburg · Contra Costa County | — | — |
| R N C Electrical Services | Robert Alan Jr Ericksen | — | (925) 570 3681 | Electricians | Discovery Bay · Contra Costa County | — | — |
| R P Builders | R P Builders | — | (510) 575 8418 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| R P C Roofing | Hector Rene Paniagua | — | (415) 601 5027 | Other roofers | Concord · Contra Costa County | — | — |
| R P Construction | Randall Boyd Peck | — | (510) 708 1591 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| R P Construction | Oscar Samuel Rojas Prado | — | (510) 384 8733 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| R P D Builders | R P D Builders | — | (805) 705 1178 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| R R S Construction | Rolando Maravilla Solinap | — | (925) 383 1541 | Electricians | Concord · Contra Costa County | — | — |
| R S Builders | R S Builders | — | (925) 705 0707 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| R S Diekman & Associates | Scott Richard Diekman | — | (925) 837 3419 | Windows, patio, painters | Danville · Contra Costa County | — | — |
| R S Mac Farlane Company INC DBA R S Company | Kristin Shae Hardesty | — | (925) 674 1300 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| R S W Specialties | R S W Specialties | — | (925) 367 4999 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| R Sagadyn Construction | Sagadyn Rostyslav | — | (415) 867 4287 | Electricians | Concord · Contra Costa County | — | — |
| R Sorenson Construction | Randal Scott Sorenson | — | (925) 250 4170 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| R Summers Construction | Robert Kirby Summers | — | (925) 988 9481 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| R T Plumbing | Robert Dean Thomas | — | (800) 706 2560 | Other | Brentwood · Contra Costa County | — | — |
| R V Mar Flooring | Martinez Rodrigo Vazquez | — | (925) 418 9786 | Other | Brentwood · Contra Costa County | — | — |
| R V O Rooter & Plumbing | Veneros Roberto | — | (510) 245 8580 | Other | Hercules · Contra Costa County | — | — |
| R V Stich Construction INC | Rocky Jack Gregg Stich | — | (510) 412 9070 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| R W Holmes Painting | R W Holmes Painting | — | (408) 505 5858 | Windows, patio, painters | Antioch · Contra Costa County | — | — |