| Rovettis Landscape & Maintenance | Nicholas John Rovetti | — | (707) 529 6098 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Roy Mechanical Services Incorporated | Shawn Edward Roy | — | (707) 523 1668 | HVAC | Sebastopol · Sonoma County | — | — |
| Roy's Landscaping INC | Rogelio Guerrero | — | (707) 939 9612 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Roy's Masonry LLC | Vega Quintero Rogelio | — | (707) 495 8255 | Other | Healdsburg · Sonoma County | — | — |
| Roy's Painting | Roy's Painting | commercial@rpccontractors.com | (707) 570 6034 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Roy's Sewer Service INC | Pearl May Berry | — | (707) 795 5656 | Other | Cotati · Sonoma County | — | — |
| Royal Electricity Empire INC | Xavier Roy | info@ndiscovered.com | (707) 721 5451 | Electricians | Rohnert Park · Sonoma County | — | — |
| Royal Kingdom Painting | Royal Kingdom Painting | — | (707) 892 9868 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Rozanski Landscaping | Robin Brown-Ward | — | (707) 495 1125 | Windows, patio, painters | Sonoma · Sonoma County | — | — |
| Rr Builder INC | Arreguin Rigoberto Ruiz | — | (707) 933 6068 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Rr Innovation Home Improvement | Carlos Augustin Renoj Renoj | — | (415) 378 3189 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Rsc Installation Of Tile & Stone Corporation | Santos Adalberto Rivera Gutierrez | rivers.tileandstone@gmail.com | (707) 755 0572 | Other | Rohnert Park · Sonoma County | — | — |
| Rsj Painting | Jeremy Floyd Hamilt Jones | — | (510) 853 0382 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Rt Seamans Construction INC | Rogan Taggart Seamans | — | (707) 318 4430 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Ruach Electric LLC | Alexander Ian Rodriguez | alex@ruachelectric.com | (707) 360 2160 | Electricians | Santa Rosa · Sonoma County | — | — |
| Ruben Olivo Builder | Ruben Olivo Builder | — | (707) 695 3548 | GC, remodel, ADU | Guerneville · Sonoma County | — | — |
| Ruben Roman Painting | Ruben Roman Painting | info@rubenromanpainting.com | (707) 843 8996 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Rubenade Fire Protection | Rubenade Fire Protection | — | (707) 322 2666 | Other | Healdsburg · Sonoma County | — | — |
| Rubicon Builders | Kyle Sean Thompson | — | (707) 360 1717 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Rudy's Landscaping | Rudy's Landscaping | — | (415) 302 0643 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Rudy's Tree Service | Jefferson Rodolfo Cab Escobedo | — | (415) 519 2970 | Tree | Rohnert Park · Sonoma County | — | — |
| Ruiz Construction & Management INC | Albor Miguel Ruiz | — | (707) 293 3774 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ruiz Landscaping INC | Avendano Edgar Ruiz | — | (707) 235 0405 | Windows, patio, painters | Kenwood · Sonoma County | — | — |
| Rupert Construction Company | Anthony Jerome Jr Rupert | impallari@gmail.com | (707) 703 7551 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Rural Resource Development INC DBA Hamblin Earthworks | Judith Ann Hamblin | — | (707) 974 6299 | Other | Healdsburg · Sonoma County | — | — |
| Rushton Construction | Tyler Widder Rushton | — | (415) 827 6636 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Russell E Hubbard General Contractor | Russell E Hubbard General Contractor | — | (415) 518 8655 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Russell Loewen | Russell Loewen | — | (707) 528 7466 | Other | Santa Rosa · Sonoma County | — | — |
| Russell Nobles Const | Russell Nobles Const | — | (707) 541 0160 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Russell Ono | Russell Ono | — | (707) 479 5989 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Russell Wahl | Russell Wahl | — | (707) 322 0020 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Russell Wood Custom Cabinets | Russell Wood Custom Cabinets | — | (707) 490 5836 | Other | Santa Rosa · Sonoma County | — | — |
| Russell's Room By Room | Russell's Room By Room | — | (707) 479 6194 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Russian River Septic & Wine Waste | Flores Rudy | — | (707) 308 5388 | Other | Santa Rosa · Sonoma County | — | — |
| Russian Riverkeeper | Birkin Hadley Newell | info@russianriverkeeper.org | (707) 974 3838 | Windows, patio, painters | Healdsburg · Sonoma County | — | — |
| Rust Plumbing INC | Ronald Wayne Jr Rust | — | (415) 408 8028 | HVAC | Petaluma · Sonoma County | — | — |
| Rustic Woodwork Construction | Roy Pales | — | (707) 888 5410 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Rusty Mila Construction | John Gerard Mila | — | (707) 326 0573 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ryan Demolski Construction | Ryan Berny Demolski | — | (707) 291 2520 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Ryan Engineering Incorporated | Martin Finbar Ryan | — | (707) 721 6715 | Other | Sonoma · Sonoma County | — | — |