| Binstock Enterprises | Dennis Ray Binstock | — | (707) 255 6172 | Other | Napa · Napa County | — | — |
| Bisso Drywall | Bisso Drywall | — | (707) 225 1948 | Other | Napa · Napa County | — | — |
| Blackard Pool Construction & Remodeling | Martin Gregory Blackard | — | (707) 287 5969 | Pool | Napa · Napa County | — | — |
| Blackney And Marsh Floors INC | Andrew Robert-Sidne Curry | — | (707) 226 7831 | Other | Napa · Napa County | — | — |
| Blakeley Construction INC | Kelly Rae Blakeley | — | (707) 942 9286 | Other | Calistoga · Napa County | — | — |
| Blakeley Landscaping INC | Josh Nathaniel Blakeley | info@blakeleylandscaping.com | (707) 942 2203 | Windows, patio, painters | Calistoga · Napa County | — | — |
| Blue Gate Construction INC | Jean Massih | — | (415) 910 6463 | GC, remodel, ADU | Napa · Napa County | — | — |
| Blue Oak Tree Services INC | Juan Carlos Garibay Quintero | — | (707) 339 6357 | Tree | American Canyon · Napa County | — | — |
| Blue Sky Utility Construction | Donald Richard Glick | — | (888) 242 6656 | Electricians | Napa · Napa County | — | — |
| Blue Star Flooring | Vincent Boquslaw Zielinski | — | (925) 389 0442 | Other | St Helena · Napa County | — | — |
| Bob And Duff's Pest Control | Bob And Duff's Pest Control | — | (707) 257-0411 | Pest, tile roofs | Napa · Napa County | — | — |
| Bohan Electric | Derek Evan Bohan | — | (707) 708 6136 | Electricians | Calistoga · Napa County | — | — |
| Bonilla Plastering | Bonilla Plastering | — | (707) 287 6215 | Other | Napa · Napa County | — | — |
| Borsetto Construction | Robert Anthony Borsetto | — | (707) 738 4609 | GC, remodel, ADU | Napa · Napa County | — | — |
| Bowman Construction And Development INC | John Alfred Bowman | — | (707) 953 2139 | GC, remodel, ADU | Napa · Napa County | — | — |
| Boyadjieff Construction INC | Casey Leroy Boyadjieff | — | (707) 942 4829 | Other | Calistoga · Napa County | — | — |
| Bpi Oneroof | Brian Michael Peterson | — | (707) 252 9990 | Other roofers | Napa · Napa County | — | — |
| Br Construction INC | Nicole Bicardo | — | (415) 717 3365 | GC, remodel, ADU | St Helena · Napa County | — | — |
| Br Landscaping Maintenance & Design INC | Guzman Ronald Gaytan | — | (707) 312 1594 | Windows, patio, painters | Rutherford · Napa County | — | — |
| Brad Pursell General Engineering INC | Bradley Jack Pursell | — | (707) 738 7608 | Other | Napa · Napa County | — | — |
| Brady Mitchell Construction INC | Brady Jay Mitchell | — | (707) 486 2514 | Electricians | Napa · Napa County | — | — |
| Brandon Morford | Brandon Morford | — | (925) 570 1886 | GC, remodel, ADU | Napa · Napa County | — | — |
| Brian Allen | Brian Allen | — | (707) 227 7197 | Electricians | Napa · Napa County | — | — |
| Brian Berger | Brian Berger | interested@domainmarket.com | (415) 559 2707 | Electricians | Napa · Napa County | — | — |
| Brian Bowen Construction Company | Brian Lee Bowen | — | (707) 486 2727 | GC, remodel, ADU | Angwin · Napa County | — | — |
| Brian Carroll Construction | Brian Gregory Carroll | — | (707) 339 3412 | GC, remodel, ADU | Napa · Napa County | — | — |
| Brian Lowrey General Contractor | Brian Lowrey General Contractor | — | (707) 287 2328 | GC, remodel, ADU | Napa · Napa County | — | — |
| Brian Skog's General Building | Brian Skog's General Building | — | (707) 812 9269 | GC, remodel, ADU | Napa · Napa County | — | — |
| Broc Stober Drapery Installations | Broc Stober Drapery Installations | — | (707) 287 7822 | Other | Napa · Napa County | — | — |
| Broyles Floor Covering | Broyles Floor Covering | — | (707) 967 0292 | Other | Napa · Napa County | — | — |
| Bruce Tucker Construction INC | Lawrence Bruce Tucker | — | (707) 255 1587 | GC, remodel, ADU | Napa · Napa County | — | — |
| Brush Creek Construction | Nicholas Charles Taylor | — | (707) 704 2669 | GC, remodel, ADU | Napa · Napa County | — | — |
| Buckingham Stairways | Buckingham Stairways | — | (707) 227 7653 | Other | Napa · Napa County | — | — |
| Bud's Metal Designs | Bud's Metal Designs | — | (707) 529 9422 | Other | Calistoga · Napa County | — | — |
| Budget Construction | Michael A Venuta | — | (805) 539 7109 | GC, remodel, ADU | Yountville · Napa County | — | — |
| Building And Design INC | Robert Holton Aston | — | (925) 899 6929 | GC, remodel, ADU | St Helena · Napa County | — | — |
| Builtworks Industries | Anthony William Lawlor | — | (707) 310 1824 | GC, remodel, ADU | Angwin · Napa County | — | — |
| Bunch Construction INC | Ronald Wayne Bunch | — | (707) 965 3548 | GC, remodel, ADU | Angwin · Napa County | — | — |
| Burgess Builder | Burgess Builder | — | (707) 480 2565 | GC, remodel, ADU | Napa · Napa County | — | — |
| Buxton Electric | Brandon William Buxton | — | (707) 758 6738 | Electricians | Napa · Napa County | — | — |