| Ralph Tiemann Enterprises | Ralph Hugh Tiemann | — | (707) 695 7080 | Other | Petaluma · Sonoma County | — | — |
| Ram Concepts INC | Thomas David Ramirez | — | (707) 888 2751 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Ramirez Builders INC | David Daniel Ramirez | — | (707) 527 6442 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ramirez Construction | Ramirez Delia Federico | — | (707) 703 0612 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ramirez Drywall | Ramirez Drywall | — | (415) 342 0839 | Other | Santa Rosa · Sonoma County | — | — |
| Ramirez Flooring | Ramirez Flooring | — | (707) 623 0584 | Other | Santa Rosa · Sonoma County | — | — |
| Ramirez Floors INC | Ramirez Carlos | — | (707) 695 1250 | Other | Petaluma · Sonoma County | — | — |
| Ramm General Construction | Perez Ramiro Lopez | — | (707) 703 8238 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ramos Property Services LLC | Eric Raul Ramos Garcia | — | (707) 582 4353 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ramza Painting INC | Edgard Ramses Zavala Barcena | ramzapainting@gmail.com | (707) 837 6467 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Randall Wilson And Sons INC | Randall Reed Wilson | — | (707) 208 7767 | GC, remodel, ADU | Vineburg · Sonoma County | — | — |
| Randy's Mobile Home Service INC | Randy Lee Jr Bodmer | — | (707) 230 2613 | Other | Rohnert Park · Sonoma County | — | — |
| Range Builders | Steven Wayne Harold | — | (415) 813 8185 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Ransom Construction | Hilary Haradon Ransom | — | (707) 481 4287 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Rapid Rooter | Leonette Franell Miksis | — | (707) 433 8053 | Other | Healdsburg · Sonoma County | — | — |
| Raposo Woodworks | Raposo Woodworks | — | (707) 806 7532 | Other | Windsor · Sonoma County | — | — |
| Rathmore Electric | Patrick Noel White | — | (415) 716 1875 | Electricians | Sonoma · Sonoma County | — | — |
| Ravenna Tile | Ravenna Tile | — | (707) 235 3319 | Other | Santa Rosa · Sonoma County | — | — |
| Raw Electric | Ryan Anthony Wirz | — | (707) 494 0363 | Electricians | Windsor · Sonoma County | — | — |
| Rawson Painting | Rawson Painting | chip@rawsonpainting.com | (707) 838 8471 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Ray & Associates | Brian Christopher Ray | — | (707) 579 4015 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ray Coleman Electric | Raymond Duncan Coleman | — | (707) 753 1460 | Electricians | Petaluma · Sonoma County | — | — |
| Ray Cortes General Contractor | Ray Cortes General Contractor | — | (415) 716 1967 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Ray Jones General Contractor | Ray Jones General Contractor | — | (707) 795 9437 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Ray's Custom Woodworking | Ray's Custom Woodworking | — | (707) 495 6867 | Other | Cloverdale · Sonoma County | — | — |
| Ray's Rescue Plumbing | Raymond Jerome Hernandez | ay@raysrescueplumbing.com | (707) 596 3095 | Other | Rohnert Park · Sonoma County | — | — |
| Ray's Well Testing Service INC | Nicholas Jon Brasesco | — | (707) 823 3191 | Other | Sebastopol · Sonoma County | — | — |
| Ray'z Drilling & Excavation | Ray'z Drilling & Excavation | — | (707) 578 2268 | Other | Forestville · Sonoma County | — | — |
| Raymond C Fields Construction | Fields Raymond C Consturction | — | (707) 236 0824 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Raymond Diaz | Raymond Diaz | — | (707) 975 1267 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Rayne Of The Wine Country | Rayne Of The Wine Country | — | (707) 527 0373 | Other | Santa Rosa · Sonoma County | — | — |
| Raynor Electric | Douglas Frank Raynor | — | (707) 823 2023 | Electricians | Sebastopol · Sonoma County | — | — |
| Razo Drilling And Pump INC | Angel Rodolfo Razo Cisneros | — | (707) 280 4958 | Other | Santa Rosa · Sonoma County | — | — |
| Razor-back Construction | David Steven Jr Dawson | interested@domainmarket.com | (707) 632 5930 | Other | Cazadero · Sonoma County | — | — |
| Raztec INC | Arturo Junior Diaz | — | (707) 230 8951 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Rb Contracting LLC | Ryan Tanner Brownlee | — | (707) 569 4791 | Electricians | Santa Rosa · Sonoma County | — | — |
| Rbr Tile & Stone INC | Jose Tony Delgado | — | (707) 541 8146 | Other | Santa Rosa · Sonoma County | — | — |
| Rca Electric INC | Ryan Christopher Anderson | info@rcaelectric.com | (707) 595 3837 | Electricians | Windsor · Sonoma County | — | — |
| Rca Intergrated Systems INC | Ryan Christopher Anderson | — | (707) 595 3837 | Electricians | Windsor · Sonoma County | — | — |
| Rdz Construction | Rodriguez Morales Antonio | — | (707) 933 6118 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |