| Tyco Roofing Co | Eric Ray Tye | — | (707) 888 0059 | Other roofers | Napa · Napa County | — | — |
| Ulitin Enterprises | George Nicholas Ulitin | — | (707) 287 5256 | GC, remodel, ADU | Napa · Napa County | — | — |
| Unique Construction | Ambriz Flores J Jesus | impallari@gmail.com | (313) 823-2011 | GC, remodel, ADU | Calistoga · Napa County | — | — |
| Universal Hardwood Flooring Specialist INC | Peter Viet Hoang | — | (707) 226 8988 | Other | Napa · Napa County | — | — |
| Upper Valley Fencing | Juan Pedro Villa Chavez | — | (707) 755 1902 | Other | Calistoga · Napa County | — | — |
| Upvalley Electric INC | Bravo Alejandro Ramirez | alex@upvalleyelectric.com | (707) 963 1918 | Electricians | St Helena · Napa County | — | — |
| Utility & Site INC | Bruce John Schmitz | — | (707) 287 1184 | Other | Napa · Napa County | — | — |
| Utility Construction & Inspection Co | Mark Thomas Peters | — | (707) 695 1690 | Electricians | Napa · Napa County | — | — |
| Uva Country Construction INC | Noe Gonzalez-Herrera | — | (707) 307 2673 | GC, remodel, ADU | Napa · Napa County | — | — |
| Uva Electric | Juan Pablo Duran | — | (707) 337 9073 | Electricians | Napa · Napa County | — | — |
| V&c Landscape | Christopher Dana Blackard | — | (707) 478 8047 | Windows, patio, painters | Napa · Napa County | — | — |
| Valencia Hardwood Floors | Valencia Hardwood Floors | — | (707) 880 2859 | Other | Napa · Napa County | — | — |
| Valko Roofing | Cory David Valko | — | (310) 956 0438 | Other roofers | Napa · Napa County | — | — |
| Valley View Landscape INC | Roberto Ramos | — | (707) 266 8039 | Windows, patio, painters | Napa · Napa County | — | — |
| Valley West Consulting & Design | Valley West Consulting & Design | — | (707) 252 8448 | HVAC | Napa · Napa County | — | — |
| Valley Woodworks | Valley Woodworks | — | (707) 265 9663 | Other | Napa · Napa County | — | — |
| Valley Yard Works INC | Lucas Albert Nerlove | — | (707) 363 7454 | Windows, patio, painters | Napa · Napa County | — | — |
| Van Winden Landscaping INC | Kelly Lee Van Winden | contact@vanwindenlandscaping.com | (707) 224 1367 | Windows, patio, painters | Napa · Napa County | — | — |
| Vega Builders INC | Gabino Vega | — | (707) 805 6992 | GC, remodel, ADU | Napa · Napa County | — | — |
| Victor Gonzalez Construction | Gonzalez Gutierrez Victor | — | (707) 738 9058 | GC, remodel, ADU | Napa · Napa County | — | — |
| Victor Landscaping INC | Victor Alfonso De La Trinidad Saucedo | — | (707) 740 5194 | Windows, patio, painters | St Helena · Napa County | — | — |
| Vinatieri Construction | Daniel Patrick Vinatieri | — | (707) 287 4632 | GC, remodel, ADU | Napa · Napa County | — | — |
| Vine Homes Construction LLC | Peter Douglas Hamilton | — | (707) 531 8009 | GC, remodel, ADU | Yountville · Napa County | — | — |
| Vino Design Build | Carlos Rivera Barragan | sales@vinodesignbuild.com | (707) 681 5942 | GC, remodel, ADU | Napa · Napa County | — | — |
| Visicon Inspection Technology | Visicon Inspection Technology | — | (707) 259-1300 | Inspectors | Napa · Napa County | — | — |
| Vision Builders Construction Company | Fernando Enrique Pino | — | (415) 275 4870 | GC, remodel, ADU | Napa · Napa County | — | — |
| Vivan Construction INC | Vivan Dario | — | (707) 337 1843 | GC, remodel, ADU | Napa · Napa County | — | — |
| Voltage Solutions Electric | Erick David Monge | — | (707) 515 8718 | Electricians | American Canyon · Napa County | — | — |
| W F Maudru Construction INC | William Frank Jr Maudru | — | (707) 495 5270 | GC, remodel, ADU | Napa · Napa County | — | — |
| W L Flynn Construction | William Lawrence Flynn | — | (707) 260 5270 | GC, remodel, ADU | Napa · Napa County | — | — |
| W Thomas Cocke's Construction | William Thomas Cocke | — | (707) 815 0568 | GC, remodel, ADU | Napa · Napa County | — | — |
| Wagoner Construction Company | John Allen Wagoner | — | (707) 326 1904 | GC, remodel, ADU | Napa · Napa County | — | — |
| Walker Building Company | Patrick Erin Walker | lq@walker-building.com | (707) 541 8568 | GC, remodel, ADU | Calistoga · Napa County | — | — |
| Wallace Tree Service | Anthony Harold Hansen | wallacetreeservice@gmail.com | (707) 255 7659 | Tree | Napa · Napa County | — | — |
| Wallace Tree Service Experts | Wallace Tree Service Experts | wallacetreeservice@gmail.com | (707) 552-3273 | Tree | Napa · Napa County | — | — |
| Wayne Wunderlich Construction | Wayne Lawrence Wunderlich | — | (707) 486 3050 | GC, remodel, ADU | Napa · Napa County | — | — |
| Webster Window & Door INC | Kurt Michael Schmidt | — | (707) 252 6068 | Windows, patio, painters | Napa · Napa County | — | — |
| Weeks Landscape | Weeks Landscape | — | (707) 410 9036 | Windows, patio, painters | Napa · Napa County | — | — |
| Well Design Premium Signage | Neil Philip Colwell | — | (707) 933 0307 | Other | Napa · Napa County | — | — |
| Wesner Excavating INC | David Donovan Ii Wesner | — | (707) 965 1056 | Other | Angwin · Napa County | — | — |