| Redwood Granite & Stone INC | Mendoza Eduardo Resendiz | — | (707) 772 9954 | Other | Santa Rosa · Sonoma County | — | — |
| Redwood Insulation | Matthew James Lambuski | rwinsulation@icloud.com | (707) 806 3922 | Other | Fulton · Sonoma County | — | — |
| Redwood Lath & Plaster | Redwood Lath & Plaster | projects@redwoodlathplaster.com | (707) 889 2794 | Other | Windsor · Sonoma County | — | — |
| Redwood Lock INC | Dave Stephen Warner | — | (707) 585 9505 | Other | Rohnert Park · Sonoma County | — | — |
| Redwood Painting Company | Thomas Edward Minnehan | — | (707) 486 0844 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Redwood Residential Fence Company | Ruiz Ubaldo | — | (707) 799 2000 | Other | Santa Rosa · Sonoma County | — | — |
| Redwood Roof Solutions INC | Carlos Adrian Arango | — | (707) 774 3650 | Other roofers | Rohnert Park · Sonoma County | — | — |
| Redwood Septic Services | Castellanos Alvaro Altamirano | — | (707) 332 2151 | Other | Petaluma · Sonoma County | — | — |
| Redwood Sewer & Drain Service | Gregory Alexander Fremault | — | (707) 393 1959 | Other | Santa Rosa · Sonoma County | — | — |
| Redwood Trails Alliance DBA Trails Engineering | Kenneth Edward Wells | — | (707) 538 9389 | Other | Santa Rosa · Sonoma County | — | — |
| Redwood Welding | Redwood Welding | redwoodwelding@gmail.com | (970) 380 0702 | Other | Petaluma · Sonoma County | — | — |
| Reece Construction | Timothy Kendall Reece | — | (707) 331 5133 | GC, remodel, ADU | Occidental · Sonoma County | — | — |
| Reese Electric INC | Jesse James Reese | amkryukov@gmail.com | (707) 699 8606 | Electricians | Rohnert Park · Sonoma County | — | — |
| Refrigeration Services | Robert Moreham Garrido | — | (707) 766 6811 | HVAC | Petaluma · Sonoma County | — | — |
| Regal Painting | Regal Painting | — | (707) 529 7135 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Rege Construction INC | William Eugene Rege | — | (707) 894 5143 | Other | Cloverdale · Sonoma County | — | — |
| Regina Plumbing | Regina Plumbing | — | (707) 431 0300 | Other | Cloverdale · Sonoma County | — | — |
| Reilly Designs | Reilly Designs | — | (415) 497 2514 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Reiter Construction INC | Jonathan Isadore Reiter | — | (715) 271-1181 | GC, remodel, ADU | Kenwood · Sonoma County | — | — |
| Reliable Affordable Electrical Contractor LLC | Arikan Haluk | — | (510) 641 9122 | Electricians | Petaluma · Sonoma County | — | — |
| Reliable Construction | Joshua Robert Cox | — | (707) 217 4174 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Reliable Crane & Rigging INC | Mary Ileen Elliff | — | (707) 778 8313 | Other | Santa Rosa · Sonoma County | — | — |
| Reliable Hardware And Steel Co | Kyle Christopher Collins | — | (707) 545 7822 | Other | Santa Rosa · Sonoma County | — | — |
| Reliable Landscape And Tree Service LLC | Roman Velazquez | — | (707) 888 5556 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Relin Construction | Gidon Alex Relin | — | (707) 367 3322 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Remodel Restoration Remediation | Leo Vincent Sr Tocchini | — | (707) 541 8338 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Ren Levine Construction | Ren Joseph Levine | — | (707) 508 5273 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Renegade Power Systems LLC | Juan Carlos Villegas Flores | agustinamingote@gmail.com | (707) 235 5383 | Electricians | Santa Rosa · Sonoma County | — | — |
| Renew By Redwood LLC | Michael Alva Tavis | — | (707) 543 1516 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Renninger Electric INC | Brandon Scott Renninger | — | (707) 291 8448 | Electricians | Windsor · Sonoma County | — | — |
| Rental Rehab INC | Brian Lee Sr Williams | — | (707) 978 2061 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Res Construction | Ryan Eugene Silva | — | (707) 321 1533 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Res Landscapes | Res Landscapes | — | (707) 235 7878 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Res-com Services Corp | Robert Lee Keech | — | (707) 544 2244 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Resendiz Construction INC | Mendoza Eduardo Resendiz | — | (707) 799 9465 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Reserve Property Management | Reserve Property Management | info@reservepm.com | (707) 341-4404 | Property managers | Sonoma · Sonoma County | — | — |
| Restoration Construction | Terry Lee Ii Turchin | — | (707) 657 7109 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Restoration Craftship | Restoration Craftship | — | (415) 706 1947 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Restorex LLC DBA Fire Water Mold Remediation | Christopher Alan King | — | (844) 623 3946 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Revelo's Painting | Revelo's Painting | — | (707) 304 1867 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |