| Rg West Builders INC | Gordon Thaddeus Stankowski | — | (707) 689 3184 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Rhinos Roofing Company LLC | Miguel Angel Lopez Barrera | rhinosroofingcompany@gmail.com | (415) 881 0523 | Other roofers | Vallejo · Solano County | — | — |
| Rhynopoxy Coatings | Rhynopoxy Coatings | — | (707) 777 4966 | Other | Fairfield · Solano County | — | — |
| Richard Garrett Dade | Richard Garrett Dade | — | (707) 748 2255 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Richard J Rosso | Richard J Rosso | — | (925) 254 3999 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Richard Williams Construction | Richard Brian Williams | — | (707) 628 9425 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Rick Jabour Building And Remodeling | Rick Jabour Building And Remodeling | — | (707) 592 7531 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Rick's Electric | George Richard Dorer | — | (707) 479 6937 | Electricians | Vallejo · Solano County | — | — |
| Rick's Flooring | Rick's Flooring | — | (707) 301 7522 | Other | Vacaville · Solano County | — | — |
| Rick's Painting & Wallcovering | Rick's Painting & Wallcovering | — | (510) 600 7245 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Ricky J Martellaro | Ricky J Martellaro | — | (707) 746 8000 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Right Now Air | John William Jr Neuman | — | (707) 447 3063 | HVAC | Vacaville · Solano County | — | — |
| Right Water Plumbing | Right Water Plumbing | — | (415) 685 7451 | Other | Fairfield · Solano County | — | — |
| Rightway Construction | Kevin Carl Severson | — | (865) 309-5218 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rigoberto Ortiz Ramirez | Rigoberto Ortiz Ramirez | — | (510) 932 3095 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rincon Ignacio Construction | Ignacio Jr Rincon Santoyo | — | (707) 738 1318 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Rio Vista Air | Rio Vista Air | dan@riovistaair.com | (707) 374 5992 | HVAC | Rio Vista · Solano County | — | — |
| Rio Vista Plumbing | Rio Vista Plumbing | michael@riovistaplumbing.com | (707) 290 6822 | Other | Rio Vista · Solano County | — | — |
| Rio-delta Garage Doors INC | Frank Jeffrey Lunsford | — | (408) 412 2676 | Other | Rio Vista · Solano County | — | — |
| Rios Flooring | Rios Flooring | — | (707) 386 3323 | Other | Fairfield · Solano County | — | — |
| Rios Painting | Rios Painting | — | (415) 612 0530 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Rise Construction Services | Craig Tommy Angove | — | (925) 899 8192 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rivenbark Home Repairs & Construction | Matthew Samuel Rivenbark | — | (510) 384 5329 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| River Delta Electric | Samuel Patrick Meyers | admin@riverdeltaelectric.com | (707) 290 0716 | Electricians | Rio Vista · Solano County | — | — |
| River Rats Septic & Plumbing | Jeanette Ann Davis | — | (916) 796 5268 | Other | Rio Vista · Solano County | — | — |
| Rivers Scaffolding INC | Ivan Lopez Olvera | — | (760) 482 6459 | Other | Fairfield · Solano County | — | — |
| Rjm Construction | Rudy Julian Mejia Chavez | — | (707) 310 3998 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rl Construction & Remodeling | Julio Cesar Rojas Lopez | — | (707) 720 4904 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Rmd Wallcovering | Richard Marshall De Soto | — | (650) 678 9046 | Other | Vacaville · Solano County | — | — |
| Robert Waller Design / Build | Robert Waller Design / Build | — | (707) 580 6171 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Robert Wells Construction Services | Robert Edward Wells | — | (707) 628 9950 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Robertson Plumbing & Construction | Michael David Robertson | — | (707) 745 4125 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Robinson Construction | James Henry Vi Robinson | bill@robinson-construction.com | (805) 258-1646 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Roca Painting And Deco | Roca Painting And Deco | — | (510) 439 8782 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Rock Crushing Solutions INC | Jeremy Allen Soiland | sebastian@aldusleaf.org | (707) 548 7809 | Other | Suisun City · Solano County | — | — |
| Rock Landscaping | Rock Landscaping | — | (707) 310 3839 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Rock Piping & Mechanical INC | Michael Brennen Begley | — | (510) 672 7770 | Other | Fairfield · Solano County | — | — |
| Rockholt Construction | Walter Lee Rockholt | — | (707) 644 5155 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rodas Diaz Construction INC | Rony Rogelio Rodas Diaz | — | (415) 272 7684 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Rodeo Construction Company | Jose Asuncion Romo | — | (925) 383 5668 | GC, remodel, ADU | Vallejo · Solano County | — | — |