| R Corp INC DBA Santa Rosa Fire Equipment | Dustin Freeborn Rota | — | (707) 546 0979 | Electricians | Santa Rosa · Sonoma County | — | — |
| R D Paving Construction | Duran Ruben | — | (707) 494 4576 | Other | Monte Rio · Sonoma County | — | — |
| R E R Construction INC | Raul Ernesto Ruiz Ramirez | — | (415) 233 0033 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| R Electric | Ruiz Hernandez Rafael | — | (707) 393 8638 | Electricians | Rohnert Park · Sonoma County | — | — |
| R G Plumbing Group INC | Robert Gregory Graniss | — | (707) 571 1195 | Other | Santa Rosa · Sonoma County | — | — |
| R H & Sons Water Services | Jacob Kane Huls | — | (707) 230 2029 | Other | Sebastopol · Sonoma County | — | — |
| R H B Builders LLC | Henry Mark Trione | — | (707) 321 0154 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| R H Dias And Son | R H Dias And Son | — | (415) 883 2197 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| R Higuera's General Construction INC | Rogelio Higuera | — | (707) 843 9710 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| R J Hollinger Construction | Robert Jeffery Hollinger | — | (707) 304 4080 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| R J Lely Construction | Robyn Jan Lely | rjlelyconstruction@gmail.com | (707) 938 1789 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| R J Mechanical INC | Robert Scott Stocker | — | (707) 792 6840 | HVAC | Cotati · Sonoma County | — | — |
| R J Wade Construction INC | Robert James Wade | — | (707) 847 8478 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| R K L Concrete | R K L Concrete | — | (707) 481 8654 | Other | Santa Rosa · Sonoma County | — | — |
| R L H Construction | Richard Lee Harris | — | (707) 486 4126 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| R L J Painting | R L J Painting | — | (707) 829 3471 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| R L Simmons Construction | Rex Lee Simmons | — | (707) 695 1463 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| R L Tile | R L Tile | — | (707) 978 1291 | Other | Santa Rosa · Sonoma County | — | — |
| R Louthan Painting | R Louthan Painting | — | (650) 255 0671 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| R Marsh Construction | Robert Lee Jr Marsh | — | (707) 322 4696 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| R Martinez Painting | R Martinez Painting | — | (415) 225 4508 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| R Mcclure Electric INC | Patrick David Hart | — | (707) 792 2101 | Electricians | Cotati · Sonoma County | — | — |
| R S Reed INC | Richard Dehmer Reed | — | (707) 935 6318 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| R Schmidt Construction INC | Robert Walter Schmidt | — | (707) 206 2077 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| R T R Electric | Ryan Thomas Rutherford | — | (707) 975 5506 | Electricians | Rohnert Park · Sonoma County | — | — |
| R W C Construction | Ryan William Cussen | — | (707) 235 2236 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| R W Colfer General Contractor | R W Colfer General Contractor | — | (707) 484 0959 | GC, remodel, ADU | Kenwood · Sonoma County | — | — |
| R&g Metals Welding | Jose Roberto Garcia Lugo | — | (707) 328 3718 | Other | Santa Rosa · Sonoma County | — | — |
| R&g Metals Welding | R&g Metals Welding | — | (707) 328 3718 | Other | Santa Rosa · Sonoma County | — | — |
| Rachel F Ginis | Rachel F Ginis | — | (415) 250 9317 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Radiant Remodeling And Carpentry | Radiant Remodeling And Carpentry | — | (925) 813 9399 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Radix Construction | Christopher Martin Mullins | — | (707) 820 1101 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Rafa's Painting LLC | Rafael Morales | — | (707) 996 0115 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Rafael And Sons Construction INC | Robert Penner | — | (415) 419 1690 | Other | Petaluma · Sonoma County | — | — |
| Rafanellis Floors | Rafanellis Floors | — | (707) 953 4668 | Other | Santa Rosa · Sonoma County | — | — |
| Rafeal Poulter | Rafeal Poulter | — | (707) 321 2521 | Other | Santa Rosa · Sonoma County | — | — |
| Raffos Hardwood Floors INC | David Michael Raffo | — | (707) 939 1940 | Other | Sonoma · Sonoma County | — | — |
| Rainbow Electric Corporation | Bassam Abdullah Samarah | — | (707) 793 8430 | Electricians | Cotati · Sonoma County | — | — |
| Rainford Childs Painting | Rainford Childs Painting | — | (707) 364 5619 | Windows, patio, painters | Sebastopol · Sonoma County | — | — |
| Ralph Holden & Co | Ralph Millard Holden | — | (707) 484 2558 | Electricians | Healdsburg · Sonoma County | — | — |