| R W Scott Construction | Russell Whitney Scott | — | (510) 421 1069 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| R W Thompson Construction INC | Robert Walter Thompson | — | (925) 370 8888 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| R W Williams Construction INC | Richard Frank Williams | — | (925) 323 9009 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| R&r Fire Protection LLC | Ricky Daniel Solorio | contact@rrfireprotection.com | (925) 329 8020 | Other | Brentwood · Contra Costa County | — | — |
| R&t Fencing INC | Navarro Ricardo Tolento | — | (925) 727 4487 | Other | Concord · Contra Costa County | — | — |
| R.a.p. Plumbing | R.a.p. Plumbing | roberto@rapplumbing.com | (925) 207 7880 | Other | Walnut Creek · Contra Costa County | — | — |
| R2l Roofing INC | Ashley Giselle Rodriguez | info@r2lroofing.com | (510) 815 5097 | Other roofers | Richmond · Contra Costa County | — | — |
| Ra Painting | Ra Painting | info@rapainting.com | (925) 437 9090 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Raaz Construction | Ghandi Amir | — | (925) 364 1358 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Rack City Electric INC | Jaron Daniel Batteux | — | (925) 355 5989 | Electricians | San Ramon · Contra Costa County | — | — |
| Radessen Construction & Design LLC | Iman Sharifirad | — | (310) 404 1852 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Radosevich Construction Company | David Walter Radosevich | — | (925) 323 8292 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Rafael's Fencing | Martinez Fernando Rafael | — | (925) 586 3392 | Other | Antioch · Contra Costa County | — | — |
| Rafael's Landscaping | Rafael Lopez | — | (925) 323 7807 | Windows, patio, painters | Pleasant Hill · Contra Costa County | — | — |
| Rafael's Tree Services INC | Martha Alicia Ramirez Montes | — | (253) 255 2264 | Tree | Oakley · Contra Costa County | — | — |
| Raheel Malik DBA Property Channel Flooring | Property Channel Flooring | — | (510) 504 8480 | Other | Walnut Creek · Contra Costa County | — | — |
| Rahimi | Rahimi Rohullah | — | (925) 755 6219 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Rai Construction | Yan Bahadur Rai | — | (415) 260 5758 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Raichoudri Construction | Raichoudri Avik | — | (925) 323 5678 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Rainbow Refinishing | Rainbow Refinishing | interested@domainmarket.com | (925) 698 6636 | Other | Antioch · Contra Costa County | — | — |
| Raintree Homes | Darrick Reid Martin | — | (925) 900 8218 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Rakkar Construction | Gurkamaljit Singh Rakkar | — | (559) 567 6095 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Ralf E Gester | Ralf E Gester | — | (925) 788 6154 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Ralph J Caputo | Ralph J Caputo | — | (925) 671 7717 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ralph Lammers Construction INC | Walter Ralph Iii Lammers | — | (925) 352 7099 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ralph Rote Construction | Ralph Louis Rote | — | (510) 774 6747 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| Ralyn Drywall | Ralyn Drywall | — | (925) 844 4604 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ram Electric Services INC | Miguel Angel Rodriguez Leal | — | (925) 323 4404 | Electricians | Pittsburg · Contra Costa County | — | — |
| Ram Real Estate Development | Ram Real Estate Development | — | (925) 200 0799 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Ram Remodeling Services INC | Angel Miguel Magana | — | (925) 206 7366 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Ram Roofing LLC | Leandro Josue Ramirez | — | (925) 252 6323 | Other roofers | Concord · Contra Costa County | — | — |
| Ram's & Sons Construction INC | Ponce Ramiro Hernandez | — | (925) 383 9804 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ramirez Building General Contractor | Ramirez Building General Contractor | — | (510) 689 4883 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Ramirez Roberto & Sons | Ramirez Roberto & Sons | — | (925) 451 1361 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Ramon's Home Improvement Services INC | Ramon Adan Farias | — | (925) 348 3375 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Ramos Pavers INC | Magda Maria Boff | — | (510) 253 8928 | Other | San Pablo · Contra Costa County | — | — |
| Randy Rossi Construction | Randy Lynn Rossi | — | (925) 550 9905 | GC, remodel, ADU | Moraga · Contra Costa County | — | — |
| Randys Pool Repair & Service | Randall David Durso | — | (925) 344 9563 | Pool | Danville · Contra Costa County | — | — |
| Ranger Installations INC DBA Ranger Audio Video Integration | Michael Joseph Vetrovec | — | (510) 538 6445 | Other | San Ramon · Contra Costa County | — | — |
| Rann Valdez Stone INC | Randy Leon Valdez | — | (510) 681 7567 | Other | Concord · Contra Costa County | — | — |