| J A Blinds And Drapery Installation | Jorge William Alcantara | — | (415) 691 1695 | Other | American Canyon · Napa County | — | — |
| J A Ortega Builders | J A Ortega Builders | — | (707) 312 0332 | GC, remodel, ADU | Rutherford · Napa County | — | — |
| J A Painting Company | Joshua Thomas Salling | — | (707) 695 4284 | Windows, patio, painters | Calistoga · Napa County | — | — |
| J Allan Schneider Corp DBA Pacific Tree Care | Jacob Ian Schneider | — | (707) 942 0261 | Other | Calistoga · Napa County | — | — |
| J B Plumbing Services | Josh Aaron Botts | — | (707) 254 5976 | Other | Napa · Napa County | — | — |
| J Briseno Drywall INC | Jose Luis Briseno | — | (707) 280 2458 | Other | Napa · Napa County | — | — |
| J Briseno Electric | Garrett Wayne Hale | — | (707) 280 2458 | Electricians | Napa · Napa County | — | — |
| J C Renovations | J C Renovations | — | (707) 290 4500 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| J D H Painting | J D H Painting | — | (707) 738 1077 | Windows, patio, painters | Napa · Napa County | — | — |
| J E S Construction | Jeffery Earl Slack | — | (707) 227 7977 | GC, remodel, ADU | Angwin · Napa County | — | — |
| J F Remodels | J F Remodels | — | (707) 712 2023 | GC, remodel, ADU | Napa · Napa County | — | — |
| J J S Woodworking | J J S Woodworking | — | (707) 738 7892 | Other | Napa · Napa County | — | — |
| J L Burkart Construction | John Lawrence Burkart | — | (707) 322 2350 | GC, remodel, ADU | Angwin · Napa County | — | — |
| J M P Construction | James Matthew Payne | — | (707) 280 1988 | GC, remodel, ADU | Napa · Napa County | — | — |
| J M S General Engineering | J M S General Engineering | — | (707) 945 0181 | Other | Yountville · Napa County | — | — |
| J R Construction - Sol Solutions INC | Josue Rosado | — | (707) 299 8850 | GC, remodel, ADU | Napa · Napa County | — | — |
| J S Construction | Jerry Michael Sleeper | — | (707) 603 5705 | GC, remodel, ADU | Napa · Napa County | — | — |
| Ja Landscaping And Hauling INC | Joshua Neil Alexander | — | (707) 280 7322 | Windows, patio, painters | Napa · Napa County | — | — |
| Jacks Plumbing | Jacks Plumbing | interested@domainmarket.com | (707) 321 1271 | Other | Napa · Napa County | — | — |
| Jacob Turner | Jacob Turner | — | (707) 704 9379 | GC, remodel, ADU | Napa · Napa County | — | — |
| Jae Young Chung | Jae Young Chung | — | (707) 224 4895 | Windows, patio, painters | Napa · Napa County | — | — |
| Jag Painting | Jag Painting | — | (707) 815 9482 | Windows, patio, painters | Napa · Napa County | — | — |
| James A Olson General Contractor | James A Olson General Contractor | — | (707) 888 4288 | GC, remodel, ADU | Napa · Napa County | — | — |
| James B Taylor Plumbing | James B Taylor Plumbing | — | (707) 963 3355 | Other | Calistoga · Napa County | — | — |
| James Dirienzo Painting | James Dirienzo Painting | — | (707) 321 1179 | Windows, patio, painters | Napa · Napa County | — | — |
| James Jackel Construction | Stephen James Jackel | — | (707) 501 3832 | GC, remodel, ADU | Napa · Napa County | — | — |
| James M Syar | James M Syar | — | (707) 383 7195 | GC, remodel, ADU | Napa · Napa County | — | — |
| James Navone Construction | James Robert Navone | hello@rfuenzalida.com | (707) 799-3066 | GC, remodel, ADU | Deer Park · Napa County | — | — |
| James Turner's Flooring | James Turner's Flooring | — | (707) 804 6787 | Other | Napa · Napa County | — | — |
| Janovich Built INC | Daniel William Jr Janovich | — | (707) 363 7600 | GC, remodel, ADU | Napa · Napa County | — | — |
| Jason Abbott Construction | Jason Paul Abbott | jasonabbottconstruction@gmail.com | (707) 480 8882 | GC, remodel, ADU | Napa · Napa County | — | — |
| Jason Chapdelain Construction | Jason William Chapdelain | — | (707) 603 9666 | GC, remodel, ADU | Napa · Napa County | — | — |
| Jason Hall Construction INC | Jason Avery Hall | — | (707) 477 8113 | GC, remodel, ADU | Napa · Napa County | — | — |
| Javco Window And Glass Contractors INC | Tina Marie Serb-Lanoway | — | (707) 252 8338 | Windows, patio, painters | Napa · Napa County | — | — |
| Javier Morales-jimenez Painting | Javier Morales-jimenez Painting | — | (707) 307 8675 | Windows, patio, painters | Napa · Napa County | — | — |
| Jay Draznin | Jay Draznin | — | (561) 856 5129 | GC, remodel, ADU | Napa · Napa County | — | — |
| Jb3 HVAC | Jb3 HVAC | — | (951) 228-7728 | HVAC | Menifee · Napa County | — | — |
| Jdr Development Company INC | Joseph Ryan Doherty | — | (707) 203 2107 | GC, remodel, ADU | Napa · Napa County | — | — |
| Jeff Bekker | Jeff Bekker | — | (707) 337 2579 | Other | Napa · Napa County | — | — |
| Jeff Christensen Concrete | Jeff Christensen Concrete | — | (707) 253 1031 | Other | Napa · Napa County | — | — |