| Raphael Smets | Raphael Smets | — | (925) 890 9014 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Raptor Fire Protection INC | Steve Norman Lamb | — | (866) 212 7763 | Other | Martinez · Contra Costa County | — | — |
| Rare Earth Landscape INC | Wendy Lynn Gallo | rick@rareearthlandscape.com | (925) 937 9119 | Windows, patio, painters | Lafayette · Contra Costa County | — | — |
| Rational Construction | Tcharssov Andrei | interested@domainmarket.com | (323) 804 3695 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Raul Caparas Pinlac General Builder | Raul Caparas Pinlac General Builder | — | (510) 815 1347 | GC, remodel, ADU | Rodeo · Contra Costa County | — | — |
| Raul Fernando Valderrama | Raul Fernando Valderrama | — | (925) 521 1807 | HVAC | Concord · Contra Costa County | — | — |
| Raul Longoria Landscaping | Raul Longoria Landscaping | — | (925) 457 4060 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Raul Perez | Raul Perez | — | (510) 964 4650 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Raul R Construction | Raul Eduardo Ruiz | — | (925) 548 1564 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Raul Villalobos Painting Services | Villalobos Raul | — | (559) 972 1640 | Windows, patio, painters | Crockett · Contra Costa County | — | — |
| Rav Systems INC | Antonio De Jesus Rocha Ventura | — | (510) 981 9771 | Electricians | Martinez · Contra Costa County | — | — |
| Raven Mountain Framing | Raven Mountain Framing | — | (219) 262 4133 | Other | Walnut Creek · Contra Costa County | — | — |
| Raven's Rock Construction | Zachary Adam Cummings | — | (925) 588 5855 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Ravig INC | Ganapavarapu Ravikanth | — | (925) 785 7284 | Electricians | Pittsburg · Contra Costa County | — | — |
| Raxe Construction INC | Rafael Bronzeado Machado | info@raxeconstruction.com | (925) 232 1325 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Ray Foundation Construction INC | Hsu Jui Chin | — | (415) 770 1984 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Ray's Mobile Modular Service | Jerald Don Glenn | — | (510) 331 2952 | GC, remodel, ADU | Byron · Contra Costa County | — | — |
| Raymond A O'connell | Raymond A O'connell | — | (925) 639 8849 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Raymond H B Wong | Raymond H B Wong | — | (510) 882 7818 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Raymond Kelly Professional Painting | Kelly Raymond Ringue | — | (925) 752 0832 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| Raynard's Appliance Repairs | Raynard's Appliance Repairs | — | (510) 453 8971 | HVAC | Richmond · Contra Costa County | — | — |
| Razo Plumbing | Razo Plumbing | — | (510) 478 2502 | Other | Hercules · Contra Costa County | — | — |
| Rb Handyman Services | Richard Steven Burgard | rbhandymanservices@gmail.com | (925) 698 8662 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Rb Plumbing | Rb Plumbing | — | (925) 457 2241 | Other | Concord · Contra Costa County | — | — |
| Rb Square Tile | Raphael Raul Baylon Bartolome | — | (747) 888 7205 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Rc Concrete INC | Odilon Nemesio Gonzalez | — | (510) 472 4589 | Other | San Pablo · Contra Costa County | — | — |
| Rc Falcon Remodeling INC | Ramirez Roberto Cerda | — | (925) 542 3038 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Rc Floors | Mark Anthony Jr Rubino | — | (925) 269 4024 | Other | Martinez · Contra Costa County | — | — |
| Rc General Construction | Ryan Gregory Connors | — | (925) 381 8955 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Rd Building Maintenance & Home Repair | Devante Joseph Cardiel-canilang | — | (650) 290 0702 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Rd Construction & Plumbing INC | Adrian Alberto Rincon-Topete | — | (925) 727 4799 | GC, remodel, ADU | Knightsen · Contra Costa County | — | — |
| Rdz Landscape Evolution LLC | Luis Alberto Rodriguez Haro | — | (510) 375 0954 | Windows, patio, painters | El Sobrante · Contra Costa County | — | — |
| Reactic Restoration | Abisibris | — | (510) 722 0200 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Ready Roof Tops | Jose Maria Ballesteros Valencia | info@readyrooftops.com | (925) 301 0328 | Other roofers | Antioch · Contra Costa County | — | — |
| Real Build Group | Nikita Petrosov | — | (925) 338 1545 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Real Property Management One | Real Property Management One | — | (925) 495-4953 | Property managers | Livermore · Contra Costa County | — | — |
| Recon Dragon & Building | Recon Dragon & Building | — | (925) 727 5354 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Red Box Business Solutions INC | Brett Thomas Fippin | — | (925) 513 0000 | Other | Brentwood · Contra Costa County | — | — |
| Red Fir Technology INC | Micah Andrew Brown | — | (925) 260 2288 | Other | Danville · Contra Costa County | — | — |
| Red Hammer Construction | Roy Christian Davi | — | (510) 703 2215 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |