| Rex Tobin | Rex Tobin | — | (707) 541 8049 | Other | Sebastopol · Sonoma County | — | — |
| Reyes Electric | Marco Antonio Reyes Espinoza | — | (707) 280 9618 | Electricians | Rohnert Park · Sonoma County | — | — |
| Reyes Father & Son INC | Kebin Noe Reyes Gramajo | — | (415) 847 8630 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Reyes Roofing | Reyes Gutierrez Amado | — | (707) 889 5026 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Reyes Sign Erection | Reyes Sign Erection | — | (707) 322 2743 | Other | Healdsburg · Sonoma County | — | — |
| Reyff Electric INC | Nicole Serna Reyff | — | (707) 585 2481 | Electricians | Rohnert Park · Sonoma County | — | — |
| Reyna Fence Company INC | Montiel Samuel Reyna | — | (707) 772 7680 | Other | Petaluma · Sonoma County | — | — |
| Rf Sealcoating And Striping | Rf Sealcoating And Striping | — | (707) 867 6289 | Other | Santa Rosa · Sonoma County | — | — |
| Rg Construction | Robert Richard Gomez | — | (707) 291 9661 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Rh Land Solutions LLC | Robert James Houweling | — | (707) 544 8332 | Other | Santa Rosa · Sonoma County | — | — |
| Rh Weaver Construction | Robert Hamilton Weaver | — | (302) 690 2549 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Rhodes Rebuilding | Rhodes Rebuilding | — | (707) 356 8847 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ricardo Torres Painting | Ricardo Torres Painting | — | (707) 623 2219 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Ricardo's Construction | Ricardo De Jesus Resendiz | — | (707) 480 0309 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Rich Hardwood Floors INC | Brad Tyson Rich | richhardwood@comcast.net | (707) 431 0110 | Other | Healdsburg · Sonoma County | — | — |
| Rich Ryan Construction INC | Richard Drew Ryan | — | (707) 433 7324 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| Rich Worden Masonry | Rich Worden Masonry | — | (707) 494 3160 | Other | Windsor · Sonoma County | — | — |
| Rich's Paving | Rich's Paving | — | (707) 763 7283 | Other | Petaluma · Sonoma County | — | — |
| Richard Geernaert Fine Finishing | Richard Geernaert Fine Finishing | — | (707) 545 5378 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Richard Hancock INC | Patrick Emil Lamar | — | (707) 528 4900 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Richard Hart & Company INC | Richard Barry Hart | — | (707) 321 4585 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Richard Lavorgna | Richard Lavorgna | — | (707) 575 3356 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Richard Murphy | Richard Murphy | — | (707) 876 3364 | GC, remodel, ADU | Bodega · Sonoma County | — | — |
| Richard N Wilmarth | Richard N Wilmarth | — | (707) 758 6892 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Richard R Van Anda | Richard R Van Anda | — | (707) 634 6040 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Richard Shockley Construction | Richard Michael Shockley | — | (707) 303 5300 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Richard Todd General Contractor | Richard Todd General Contractor | — | (707) 545 1122 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Richards Concrete Construction | Darrel Dean Richards | — | (707) 939 0118 | Other | El Verano · Sonoma County | — | — |
| Richards Construction | Michael Brian Richards | — | (707) 779 9675 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Richardson Plastering | Richardson Plastering | — | (707) 246 0877 | Other | Petaluma · Sonoma County | — | — |
| Rick Genobles Plumbing | Rick Genobles Plumbing | — | (707) 338 6320 | Other | Petaluma · Sonoma County | — | — |
| Rick Gio Masonry | Rick Gio Masonry | — | (415) 717 4114 | Other | Sebastopol · Sonoma County | — | — |
| Rick Merian Drywall | Rick Merian Drywall | — | (707) 290 3151 | Other | Santa Rosa · Sonoma County | — | — |
| Rick Pepper Drywall | Rick Pepper Drywall | — | (707) 527 2012 | Other | Healdsburg · Sonoma County | — | — |
| Ridge Construction | John Edward Entriken | info@ridge-construction.com | (707) 847 3314 | GC, remodel, ADU | Cazadero · Sonoma County | — | — |
| Ridge Construction LLC | Tyler Robert Nagel | info@ridge-construction.com | (585) 245 1909 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Ridgeback Mechanical | Ridgeback Mechanical | — | (707) 292 0947 | HVAC | Sonoma · Sonoma County | — | — |
| Ridgeline Painting | Ridgeline Painting | — | (707) 321 2769 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Ridgeline Roofing Co | Gabriel F Mccarthy | info@ridgelineroofingco.com | (707) 838 8209 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Ridgeview Builders INC | Thomas Alan Langer | — | (707) 545 7005 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |