| Re-volt Electric INC | Christopher James Meydenbauer | — | (707) 987 5930 | Electricians | Santa Rosa · Sonoma County | — | — |
| Rea Roofing | David Rea | — | (707) 332 0081 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Reab Construction | Mark David Reab | — | (707) 292 2189 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Real Property Improvements | Real Property Improvements | — | (707) 217 2546 | GC, remodel, ADU | Cloverdale · Sonoma County | — | — |
| Real Property Management Millennium | Real Property Management Millennium | — | (707) 509-0066 | Property managers | Sonoma · Sonoma County | — | — |
| Reales Construction | Indalecio Reales Cortez | — | (415) 342 0987 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Really Good Property | Really Good Property | — | (707) 637-6559 | Property managers | Sonoma · Sonoma County | — | — |
| Really Wise Flooring & Restoration | Really Wise Flooring & Restoration | — | (707) 790 7894 | Restoration | Santa Rosa · Sonoma County | — | — |
| Realm Industries | Ariel Howard Herman | re.construction@sonic.net | (707) 217 2785 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Rebel Pipelines General Engineering INC | Evan Michael Ray O Connor | — | (415) 574 5559 | Other | Petaluma · Sonoma County | — | — |
| Rebich Construction INC | John Joseph Rebich | — | (707) 756 7015 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Rebich Technologies | Rebich Technologies | brebich@rebichtechnologies.com | (707) 239 9308 | Other | Windsor · Sonoma County | — | — |
| Rebuilding Together Petaluma INC | Drake Edwin Cunningham | — | (707) 765 3944 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Record Building LLC | Christopher Ryan Record | ryan@recordbuilding.com | (707) 536-8637 | GC, remodel, ADU | Geyserville · Sonoma County | — | — |
| Rector Plumbing INC | Zachary Aaron Rector | scott@rectorplumbing.com | (707) 478 9496 | Other | Santa Rosa · Sonoma County | — | — |
| Red Lake Restoration LLC | Nikoli Jacques Levy | info@ndiscovered.com | (707) 393 0650 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Red Line Construction | Travis Keith Bunker | — | (707) 888 3416 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Red Oak Contracting LLC | Martin David Ponzo | — | (707) 953 0554 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Red Rock Pools | Red Rock Pools | — | (707) 694 4217 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Red Vino Landscape LLC | Cosme Garduno | info@redvinolandscape.com | (707) 529 0976 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Red's Plumbing | Red's Plumbing | — | (707) 540 4333 | Other | Santa Rosa · Sonoma County | — | — |
| Redbridge Electric INC | Montenegro Bercelio | — | (707) 835 3567 | Electricians | Petaluma · Sonoma County | — | — |
| Redefined Spaces | Redefined Spaces | — | (415) 297 1930 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Redhawk Glass INC | Denver Lafe Miller | — | (707) 584 8888 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Redi | Albert Anthony Hernandez | — | (707) 566 0315 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Redi Construction & Restoration | Redi Construction & Restoration | — | (707) 985-8155 | Restoration | Santa Rosa · Sonoma County | — | — |
| Redi To Paint | Redi To Paint | roberto@robertoredi.com | (707) 236 2024 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Redican Homes | Redican Homes | — | (707) 762 4958 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Reds Residential And Restaurant Construction INC | Richard Jay Travis | — | (707) 909 4686 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Redwood Builder Incorporated | Nicholas Kenneth Bowers | — | (415) 596 4355 | GC, remodel, ADU | Guerneville · Sonoma County | — | — |
| Redwood Builders | Daniel Walter Harbin | — | (415) 269 4062 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Redwood Coast Painting | Robert Wingate Gibbs | — | (707) 545 3336 | Windows, patio, painters | Sebastopol · Sonoma County | — | — |
| Redwood Concrete Construction INC | Evan Ross Glanville | evan@redwoodconcreteconstruction.com | (707) 478 2408 | Other | Sebastopol · Sonoma County | — | — |
| Redwood Empire Awning And Furniture Co | Michael Keith Lenney | — | (707) 588 9900 | Other | Santa Rosa · Sonoma County | — | — |
| Redwood Empire Construction | Tyler Douglas Arth Miller | info@redwoodempireconstruction.com | (415) 763 2661 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Redwood Empire Mechanical INC | Tony Rivas | — | (707) 396 7847 | HVAC | Santa Rosa · Sonoma County | — | — |
| Redwood Empire Roofing | Aaron Matthew Gernhardt | info@redwoodempireroofing.com | (707) 931 9980 | Other roofers | Windsor · Sonoma County | — | — |
| Redwood Empire Tree Service | Jesse Sabino Iii Gonzalez | — | (707) 217 0051 | Tree | Santa Rosa · Sonoma County | — | — |
| Redwood Empire Vineyard Management INC | Tyler Don Klick | — | (707) 857 1670 | Other | Geyserville · Sonoma County | — | — |
| Redwood Glass Company | Donald Peter Jr Ransom | redwoodglass@gmail.com | (707) 763 2477 | Windows, patio, painters | Petaluma · Sonoma County | — | — |