| R M Z Design & Construction | Adam Ricardo Ramirez | — | (530) 363 0619 | GC, remodel, ADU | Davis · Yolo County | — | — |
| R S Construction | Robert Paul Sprague | — | (916) 825 8104 | GC, remodel, ADU | Davis · Yolo County | — | — |
| R S Services | Rollo Dean Stephens | — | (916) 997 0744 | Other | West Sacramento · Yolo County | — | — |
| R W C Construction | Richard Ward Cole | — | (530) 304 6584 | GC, remodel, ADU | Davis · Yolo County | — | — |
| R&e Utilities And Grading Construction INC | Melendez Raul | — | (530) 838 6543 | Other | Woodland · Yolo County | — | — |
| Ramco Paving & Grading | Jose Luis Ramirez | — | (530) 392 1009 | Other | Woodland · Yolo County | — | — |
| Ramcon Engineering & Environmental Contracting INC | Michael Stephen Ramos | — | (916) 372 7535 | Other | West Sacramento · Yolo County | — | — |
| Ramon Cisneros Ramos | Ramon Cisneros Ramos | — | (530) 908 6740 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Ramos Environmental | John James Villanueva | — | (916) 371 5747 | Other | West Sacramento · Yolo County | — | — |
| Ransdell Remodel & Home Repair | Ransdell Remodel & Home Repair | — | (530) 304 6191 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Raul G Deanda Construction INC | Raul Gerard De Anda | — | (916) 952 2121 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Raumbau | Paul Edgcomb Oliver | — | (916) 417 8812 | Other | West Sacramento · Yolo County | — | — |
| Raza Electric Solutions | Ahmad Nmn Raza | — | (916) 678 2320 | Electricians | West Sacramento · Yolo County | — | — |
| Rc Telecom INC | Ryan Michael Cunningham | — | (530) 312 5424 | Electricians | Woodland · Yolo County | — | — |
| Rca Hardscapes INC | Christian Isrrael Sr Fierros Avila | — | (707) 688 9642 | Windows, patio, painters | Davis · Yolo County | — | — |
| Reamer Line Construction LLC | James Clayton Jr Reamer | — | (916) 417 0948 | Electricians | Clarksburg · Yolo County | — | — |
| Rec General Contractor | Rec General Contractor | re_cortes80@hotmail.com | (530) 383 6501 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Red Door Building Company INC | Eric Carl Roe | — | (530) 304 4716 | GC, remodel, ADU | Davis · Yolo County | — | — |
| Red Feather Construction | William Guy Henderson | — | (707) 624 5751 | GC, remodel, ADU | Winters · Yolo County | — | — |
| Renov8 Remodeling | Renov8 Remodeling | cjenningspro@gmail.com | (760) 500 6501 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Rent A Husband | Mohammad Usman Sadiq | — | (530) 315 2736 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Resource Builder | Resource Builder | — | (916) 225 9523 | GC, remodel, ADU | Woodland · Yolo County | — | — |
| Resource Management | Resource Management | — | (530) 668 7525 | Other | Woodland · Yolo County | — | — |
| Retter Electric | Martin Joseph Bush | retterelectric@gmail.com | (415) 310 7841 | Electricians | Woodland · Yolo County | — | — |
| Rex A Klein | Rex A Klein | — | (916) 612 2901 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Rey's Air Solution INC | Jesus Navarrete Castro | — | (916) 873 0507 | HVAC | West Sacramento · Yolo County | — | — |
| Reyes Heating And Air | Reyes Heating And Air | reyes@reyesheatingair.com | (916) 539 6005 | HVAC | Woodland · Yolo County | — | — |
| Reynolds Painting | Reynolds Painting | jason@reynolds-painting.com | (530) 816 0134 | Windows, patio, painters | Davis · Yolo County | — | — |
| Ria Engineering Construction | Nora Elizabeth Rivera | — | (510) 374 0723 | Other | Woodland · Yolo County | — | — |
| Ric Olstad Roofing | Richard Palmer Olstad | — | (530) 666 5188 | Other roofers | Woodland · Yolo County | — | — |
| Rick E Webb General Contractor | Rick E Webb General Contractor | — | (916) 812 4728 | GC, remodel, ADU | West Sacramento · Yolo County | — | — |
| Rick Pratt | Rick Pratt | — | (916) 396 0689 | Other | West Sacramento · Yolo County | — | — |
| Ridge Electric INC | Stephen Christopher Griffiths | — | (530) 681 5406 | Electricians | Woodland · Yolo County | — | — |
| Rios Painting | Rios Painting | — | (530) 312 3279 | Windows, patio, painters | Woodland · Yolo County | — | — |
| Rise Up Elevator INC | Cody Wayne Braun | reporting@riseupelevator.com | (916) 662 9158 | Other | West Sacramento · Yolo County | — | — |
| Rivas Quality Painting | Rivas Quality Painting | — | (408) 883 5154 | Windows, patio, painters | Davis · Yolo County | — | — |
| River City Fence INC | Sean O'casey Hayden | — | (916) 371 3700 | Other | West Sacramento · Yolo County | — | — |
| Rivera's Painting | Rivera's Painting | — | (530) 383 5462 | Windows, patio, painters | Esparto · Yolo County | — | — |
| Rivercity Roofing INC | Fred Arthur Gregory | — | (916) 371 4578 | Other roofers | West Sacramento · Yolo County | — | — |
| Rle Custom Concrete LLC | Francisco Javier Chavez-Solano | — | (530) 601 6469 | Other | Dunnigan · Yolo County | — | — |