| Rodney Mangus | Rodney Mangus | — | (925) 890 6916 | Windows, patio, painters | Orinda · Contra Costa County | — | — |
| Rodney Rumble | Rodney Rumble | — | (925) 336 9596 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Rodriguez Building | Rodriguez Building | — | (510) 812 8030 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Rodriguez Construction | Rodriguez Roberto | — | (925) 303 9264 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Rodriguez Electric | Rodriguez Sandro | — | (925) 323 6661 | Electricians | Pittsburg · Contra Costa County | — | — |
| Rodriguez General Construction | Rodriguez Alfredo | — | (925) 848 5102 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Rodriguez J. Rock Construction INC | Jose Rodriguez | — | (510) 367 4525 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Roemer Painting INC | Timothy Jay Roemer | — | (510) 507 4939 | Windows, patio, painters | Pleasant Hill · Contra Costa County | — | — |
| Rogee Hydronics Corp | Ron Howard Laurence | projects@rogeehydronics.com | (818) 707 2666 | Other | Pleasant Hill · Contra Costa County | — | — |
| Rogelstad Home Repair LLC | Richard Michael Ray | — | (925) 684 4966 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Roger Allen Marcotte Jr | Roger Allen Marcotte Jr | — | (925) 283 0300 | Pool | Lafayette · Contra Costa County | — | — |
| Roger Bergin Construction INC | Roger Patrick Bergin | — | (415) 640 7963 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Rogers House Moving | Rogers House Moving | — | (925) 207 3285 | Other | Antioch · Contra Costa County | — | — |
| Rogers House Moving INC | Michael Glen Rogers | — | (925) 207 3285 | Other | Antioch · Contra Costa County | — | — |
| Rogge Excavating Paving And Grading LLC | Joel Obadiah Rogge | — | (925) 421 8849 | Other | Bethel Island · Contra Costa County | — | — |
| Rogue Cx Services LLC | Brian William Pfaff | — | (925) 727 2587 | Electricians | Brentwood · Contra Costa County | — | — |
| Roguez Drywall INC | Rodriguez Antonio | — | (925) 437 4623 | Other | Oakley · Contra Costa County | — | — |
| Rojas Construction | Rojas Israel | — | (925) 267 2812 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Rojas Construction & Remodeling INC | Adalberto Lopez Gutierrez | — | (925) 584 6911 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Rojas Renovations INC | Brian Arthur Rojas | — | (925) 566 4841 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Rollamatic Roofs INC | Daniel Douglas Roberts | — | (415) 822 5655 | Other roofers | Rodeo · Contra Costa County | — | — |
| Rolling Gates | Rolling Gates | — | (888) 588 1470 | Other | Walnut Creek · Contra Costa County | — | — |
| Roman Remodeling INC | Hernandez Salomon Roman | — | (510) 334 2486 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Romans Tree Service INC | Erick Roman | — | (888) 576 6267 | Tree | Orinda · Contra Costa County | — | — |
| Romar Construction Co | Daniel Steven Rogers | — | (925) 825 8096 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Romero's HVAC INC | Manuel Ochoa Romero | — | (925) 686 4289 | HVAC | Concord · Contra Costa County | — | — |
| Romero's Welding | Romero's Welding | — | (925) 550 0518 | Other | Brentwood · Contra Costa County | — | — |
| Romero's Welding And Marine Services INC | Jesus Guillermo Romero | — | (925) 550 0518 | Other | Brentwood · Contra Costa County | — | — |
| Ron Pedersen Painting & Decorating Contractor | Ronald Jene Pedersen | — | (510) 918 4182 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Ron Tostenson Construction INC | Tostenson Ronald | — | (510) 323 3145 | GC, remodel, ADU | Point Richmond · Contra Costa County | — | — |
| Ron's Hauling | Ron's Hauling | saidian1@pacbell.net | (925) 260 3651 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Ron's Window Coverings | Ron's Window Coverings | — | (925) 255 6266 | Other | Concord · Contra Costa County | — | — |
| Ronald David Gilardi | Ronald David Gilardi | — | (925) 989 2469 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Ronald Hanson Construction | Ronald John Hanson | — | (925) 413 1991 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Ronald W Martin | Ronald W Martin | — | (510) 508 3595 | GC, remodel, ADU | Kensington · Contra Costa County | — | — |
| Rondi General Service | Ronald Roger Diaz | — | (510) 815 4304 | Electricians | Concord · Contra Costa County | — | — |
| Ronlod Doors Locks & Security | Ronlod Doors Locks & Security | — | (408) 858 0187 | Alarm and generators | Brentwood · Contra Costa County | — | — |
| Roof Commander | Rolando Mazariego | — | (925) 339 1495 | Other roofers | Brentwood · Contra Costa County | — | — |
| Roof Life Construction | Thomas Craig Rhoads | — | (925) 895 3549 | Other roofers | San Ramon · Contra Costa County | — | — |
| Roof Tile Custom Specialists INCProtected | Carl Michael Berendsen | rooftilecustom@yahoo.com | (925) 634 8700 | Tile roofers | Antioch · Contra Costa County | — | — |