| Robert Cheyenne Warner DBA Just Floor You | Just Floor You | — | (707) 838 9624 | Other | Windsor · Sonoma County | — | — |
| Robert D Wolcott | Robert D Wolcott | — | (707) 545 9222 | Electricians | Santa Rosa · Sonoma County | — | — |
| Robert Dehoney | Robert Dehoney | — | (707) 953 2426 | HVAC | Sebastopol · Sonoma County | — | — |
| Robert Hutten Construction | Robert Bernard Hutten | — | (707) 322 1291 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Robert J Illia | Robert J Illia | — | (707) 849 7124 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Robert Kline Construction INC | Robert Blakeslee Kline | — | (707) 523 4912 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Robert Lloyd | Robert Lloyd | — | (707) 280 4774 | Other | Santa Rosa · Sonoma County | — | — |
| Robert O'gorman General Contractor | Robert O'gorman General Contractor | — | (707) 408 3396 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Robert Sanders & Co | Robert Callaway Sanders | info@robertsanders.com | (707) 326 5851 | Other | Sonoma · Sonoma County | — | — |
| Robert Songer Painting & Decorating | Robert Songer Painting & Decorating | — | (707) 758 5284 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Robert Sterler | Robert Sterler | — | (707) 849 2621 | Electricians | Cazadero · Sonoma County | — | — |
| Robert Stewart Builder | Robert Stewart Builder | — | (707) 484 1546 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Robert W Haas Enterprises INC DBA R W Haas Retractable Screen | Robert Wayne Haas | — | (707) 540 0490 | Other | Santa Rosa · Sonoma County | — | — |
| Robert W Holcomb | Robert W Holcomb | — | (707) 367 1245 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Robert W Von Ahn Plumbing & Electrical Contractor | Robert William Von Ahn | — | (415) 847 1990 | Electricians | Petaluma · Sonoma County | — | — |
| Robert William Merian DBA Sweet Water Plumbing | Sweet Water Plumbing | — | (707) 823 8501 | Other | Sebastopol · Sonoma County | — | — |
| Robert's River Painting | Robert's River Painting | — | (707) 540 2725 | Windows, patio, painters | Rio Nido · Sonoma County | — | — |
| Roberts Service & Construction | Kathleen Ann Roberts | — | (707) 584 5880 | HVAC | Santa Rosa · Sonoma County | — | — |
| Robertson Construction | Alan Dale Robertson | dave@robertsonconstruction.com | (321) 795-3655 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Robinson & Son's Construction INC | Martin Jerome Robinson | — | (707) 971 3704 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Robinson Tile Co | Jamie Edward Robinson | — | (707) 953 3927 | Other | Cotati · Sonoma County | — | — |
| Robinwood Construction LLC | Robin Michael Guilfoyle | — | (707) 857 3116 | GC, remodel, ADU | Geyserville · Sonoma County | — | — |
| Roca Construction INC | Roca Marvin | — | (707) 217 1773 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Roca Painting INC | Evelyn Aracely Escobar Orellana | camposrocael931@gmail.com | (415) 756 0782 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Roca Plumbing | Roca Plumbing | — | (415) 424 2042 | Other | Santa Rosa · Sonoma County | — | — |
| Rocco Painting Co INC | Glen Steven Rocco | — | (707) 537 8818 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Rocha Construction | Ronald Joseph Rocha | — | (707) 996 9449 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Rock Path Concrete | Rock Path Concrete | — | (707) 548 6210 | Other | Rohnert Park · Sonoma County | — | — |
| Rock Solid Drains INC | Casey William Post | — | (707) 889 8191 | Other | Santa Rosa · Sonoma County | — | — |
| Rock Star Masonry | Rock Star Masonry | — | (707) 481 2031 | Other | Santa Rosa · Sonoma County | — | — |
| Rocket Science | Mark Blair| Nickel J W Nickel | — | (415) 760 5779 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Rockin Roofers | Sean Alexander Green | — | (707) 285 7037 | Other roofers | Petaluma · Sonoma County | — | — |
| Rockridge Construction | Michael Nicholas Masloff | — | (415) 328 8194 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Rod Collamer Construction | Rodney Lee Collamer | — | (707) 703 7877 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Rodas Brothers Construction Incorporated | Justo Roquefeler Rodas Vicente | — | (415) 572 2867 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Rodd Renovations INC | Rodd Lee Kneeland | roddrenovations@yahoo.com | (707) 337 4285 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Roddan Electrical Services | Kevin Quinn Roddan | — | (707) 781 8211 | Electricians | Cotati · Sonoma County | — | — |
| Rodney H Kruckenberg | Rodney H Kruckenberg | — | (707) 433 6128 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Rodney Matteri | Rodney Matteri | — | (707) 974 5918 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Rodrigo Valencia Tile | Rodrigo Valencia | — | (707) 687 5049 | Other | Fulton · Sonoma County | — | — |