| Ultimate Tree Service LLC | Arcangel Martinez-Villegas | — | (707) 535 6474 | Tree | Santa Rosa · Sonoma County | — | — |
| Ultra Air HVAC | Ultra Air HVAC | sebastian@aldusleaf.org | (707) 210 5992 | HVAC | Santa Rosa · Sonoma County | — | — |
| Under Pressure Paint LLC | Ricardo Ariel Cortez | — | (707) 975 7230 | Windows, patio, painters | Rohnert Park · Sonoma County | — | — |
| Under The House Moisture Specialist | Under The House Moisture Specialist | — | (707) 536 6516 | Other | Santa Rosa · Sonoma County | — | — |
| Underscore Design And Build | William Weil Stark | — | (216) 798 5858 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Union Pacific Construction INC | Anthony Jerome Durenberger | — | (707) 753 0719 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Unique Landscape Management | Unique Landscape Management | — | (707) 542 0960 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| United Asphalt & Construction | Bill Anthony Wasso | — | (951) 850 4243 | Other | Cotati · Sonoma County | — | — |
| United Construction | Michael Alan Mc Pherson | akneisel@unitedconstruction.com | (707) 332 0703 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| United Sheet Rock INC | Daniel Joseph Warren | office@unitedsheetrock.com | (707) 293 9784 | Other | Santa Rosa · Sonoma County | — | — |
| United States Plumbing U S P | Ryan Eugene Boyd | — | (707) 843 0065 | Other | Santa Rosa · Sonoma County | — | — |
| United Striping 101 INC | Marsha Colette Caprara | — | (707) 766 9499 | Other | Penngrove · Sonoma County | — | — |
| Unity Building & Electric Co | Mark Steven Doolittle | — | (707) 778 8585 | Electricians | Petaluma · Sonoma County | — | — |
| Unityframe Builder | Unityframe Builder | — | (707) 328 2254 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Universal Electric | Dustin Shawn Rota | — | (707) 838 2619 | Electricians | Santa Rosa · Sonoma County | — | — |
| Universal Excavation Co | Karen Susan Ruano-La Forge | — | (707) 823 3828 | Other | Sebastopol · Sonoma County | — | — |
| Unlimited Property Services | George Lee Johnson | — | (415) 740 0195 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Uppacreek Construction | Rod Elgin Hanson | — | (707) 632 5931 | GC, remodel, ADU | Guerneville · Sonoma County | — | — |
| Upscale Drywall | Upscale Drywall | mattupscale@gmail.com | (415) 871 6701 | Other | Petaluma · Sonoma County | — | — |
| Urban Equity Builders | Charles Olpp | — | (707) 495 7008 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Urban Green Spaces | Urban Green Spaces | — | (707) 478 9221 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Urban Landscapes | Urban Landscapes | interested@domainmarket.com | (415) 827 0430 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Urban Window Solutions | Urban Window Solutions | — | (707) 939 8687 | Other | Sonoma · Sonoma County | — | — |
| Us Titan Construction LLC | Dennis Dagoberto Menjivar Martinez | — | (707) 843 2253 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Uvs Modern Painting Solutions INC | Uriel Valdovinos | — | (707) 486 2652 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| V C T | V C T | — | (707) 843 6592 | Other | Santa Rosa · Sonoma County | — | — |
| V Electric | Victor Manuel Valle Leon | info@v-electric.com | (415) 596 6891 | Electricians | Rohnert Park · Sonoma County | — | — |
| V Reyes Painting & Design | V Reyes Painting & Design | — | (707) 953 6669 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| V2 Construction & Remodel | Victor Angel Valencia | — | (707) 921 8276 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Valadez & Moore | David James Moore | — | (707) 486 9385 | Other | Healdsburg · Sonoma County | — | — |
| Valcon Construction | Andrew Steven Valencia | — | (707) 477 6557 | Electricians | Petaluma · Sonoma County | — | — |
| Valdez Home Builders INC | Francisco Javier Valdez Avila | — | (707) 396 7917 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Valencia General Construction | Cesar Raul Valencia | — | (707) 483 9781 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Valencia Painting & Sons INC | Sanchez Rodriguez Emelia | — | (707) 292 8226 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Valente Building & Remodeling | Valente Building & Remodeling | — | (707) 479 4277 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Valentine Builders INC | Millie Noble Valentine | — | (707) 762 9700 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| Valenzano Construction | Valenzano Darren | darrenv@valenzanoconstruction.com | (707) 774 3179 | Other roofers | Petaluma · Sonoma County | — | — |
| Valley Builders | Valley Builders | — | (707) 889 3775 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Valley Comfort Heating And Air INC | Bryan Scott Simning | bryan@valleycomfortheatingair.com | (707) 539 4533 | HVAC | Santa Rosa · Sonoma County | — | — |
| Valley Concrete & Ironworks LLC DBA Valley Concrete | Mathew Ryan Browne | — | (707) 888 7918 | Other | Sonoma · Sonoma County | — | — |