| Ridgway Custom Building | Ridgway Custom Building | — | (415) 302 3465 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Rieger Tile | Rieger Tile | — | (707) 480 0040 | Other | Penngrove · Sonoma County | — | — |
| Riesbeck Construction | Martin William Riesbeck | riesbeckconstruction@gmail.com | (415) 342 4398 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Right Way Electrical | Francis Charles Jr Farrell | — | (707) 479 6444 | Electricians | Santa Rosa · Sonoma County | — | — |
| Rigney Plumbing INC | David Jerry Rigney | — | (707) 765 2600 | Other | Petaluma · Sonoma County | — | — |
| Rigo Landscaping INC | Garcia-carranza Rigoberto | rigo.landscapingservice@gmail.com | (707) 758 0398 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Rigo's Custom Cabinets | Rigo's Custom Cabinets | — | (707) 696 6864 | Other | Windsor · Sonoma County | — | — |
| Rigo's Quality Painting | Rigo's Quality Painting | — | (707) 490 8615 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Rincon Valley Framing | Rincon Valley Framing | — | (707) 367 0362 | Other | Santa Rosa · Sonoma County | — | — |
| Rios Plumbing INC | Dario Rios | — | (707) 590 8089 | Other | Santa Rosa · Sonoma County | — | — |
| Riptide Construction Incorporated | Robert Dudley Jones | — | (707) 577 0264 | Pool | Santa Rosa · Sonoma County | — | — |
| Rise Rigging LLC | Scott Avery Brown | — | (415) 446 9256 | Other | Petaluma · Sonoma County | — | — |
| Rising Gardens LLC | Benjamin Ogden Redlich | — | (707) 364 8973 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Rising Starr Construction INC | Joshua Thomas Kesecker | office@risingstarrconstruction.com | (707) 858 4942 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Risling Electric | Kenneth D Risling | rise@sonic.net | (707) 799 4349 | Electricians | Santa Rosa · Sonoma County | — | — |
| Riva And Cal Construction INC | Jose Antonio Moreno Rivadeneyra | contact@rivacalconstruction.com | (707) 806 4921 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| River Rock Drywall | River Rock Drywall | — | (707) 239 3978 | Other | Cazadero · Sonoma County | — | — |
| Rivers HVAC Solutions | Rivers HVAC Solutions | — | (707) 494 9732 | HVAC | Santa Rosa · Sonoma County | — | — |
| Riverside Electric | David Wayne Tippey | — | (707) 540 5326 | Electricians | Windsor · Sonoma County | — | — |
| Rivertown Electric | Eric Dwayne Scudder | — | (707) 779 2772 | Electricians | Petaluma · Sonoma County | — | — |
| Rjb Builders | Robert John Pietro Burkhard | rob@rjb-builders.com | (415) 870 5974 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Rjohn Development Co | Robert John Russell | — | (650) 619 4986 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Rk West | Kurt Hugh Kissmann | — | (707) 695 4928 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Rl Builders INC | Leo Gerard Von Raesfeld | info@rl-builders.com | (707) 762 2701 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Rlm Construction | Richard Leroy Maloney | — | (707) 696 2658 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Rmac Construction | Robert Bryan Mc Elroy | — | (415) 515 4564 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Rmb Builders LLC | Ricardo Ramirez Membrila | — | (707) 393 1975 | GC, remodel, ADU | Graton · Sonoma County | — | — |
| Rme Steel & Sheet Metal | Escobar Ronael Morales | — | (707) 393 8207 | Other | Santa Rosa · Sonoma County | — | — |
| Rn Construction | Russell Lester Nobles | russellnobles@rnconstruction.com | (707) 541 0160 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Rnr Landscaping | Rnr Landscaping | — | (707) 889 8895 | Windows, patio, painters | Penngrove · Sonoma County | — | — |
| Road Runner Glass & Glazing | Sean Lee Flynn | — | (707) 909 7113 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Rob Heinemann Pool Equipment Repair | Rob Heinemann Pool Equipment Repair | — | (415) 497 3021 | Pool | Petaluma · Sonoma County | — | — |
| Robb Burns Construction | Robert Timothy Burns | — | (707) 481 0581 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Robello Plumbing | Aaron Joseph Robello | info@robelloplumbing.com | (707) 762 4570 | Other | Petaluma · Sonoma County | — | — |
| Robert A Arndt Construction | Robert Alan Arndt | — | (415) 669 1181 | GC, remodel, ADU | Valley Ford · Sonoma County | — | — |
| Robert A Schalich Construction | Robert Anthony Schalich | — | (707) 544 5910 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Robert Andersen Construction | Andersen Robert | — | (707) 486 9373 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Robert Bjorkquist | Robert Bjorkquist | — | (707) 433 2008 | Other | Healdsburg · Sonoma County | — | — |
| Robert Brookhouse | Robert Brookhouse | — | (707) 327 7440 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Robert C Mann | Robert C Mann | — | (707) 972 7720 | Other | Cazadero · Sonoma County | — | — |