| Bananas At Large INC | Alan Scott Rosen | — | (415) 457 7600 | Other | San Rafael · Marin County | — | — |
| Barkley Builders INC | Paul Joseph Barkley | — | (415) 893 9098 | GC, remodel, ADU | Novato · Marin County | — | — |
| Barnabe Builders | Barnabe Builders | — | (707) 775 0479 | GC, remodel, ADU | Lagunitas · Marin County | — | — |
| Barnet Construction | Jonathan David Sr Briceno Barnet | goham1277@gmail.com | (415) 524 9475 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Barrett Brown Construction | Barrett Hall Brown | — | (415) 302 4819 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Barretta Property Services | Sam Jr Barretta | — | (650) 464 8333 | GC, remodel, ADU | Novato · Marin County | — | — |
| Barrios Construction 20 LLC | Juan Carlos Barrios Santos | — | (415) 652 9745 | GC, remodel, ADU | Novato · Marin County | — | — |
| Barrios Drywall INC | Edras Ageo Barrios Cruz | — | (415) 235 9152 | Other | San Rafael · Marin County | — | — |
| Barry Price Construction | Barry F Price | — | (415) 971 3710 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Barry Stompe | Barry Stompe | — | (415) 870 5156 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Bart Atkinson Construction INC | Bartley Irvine Atkinson | — | (478) 808 0732 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Bartlett Tree Experts | Robert Addison Jr Bartlett | — | (415) 472 8640 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Bartley Construction | Noel Patrick Bartley | — | (415) 760 4971 | GC, remodel, ADU | Novato · Marin County | — | — |
| Barton Design And Construction INC | James David Barton | — | (415) 271 8754 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Baswell Plumbing | Baswell Plumbing | baswellplumbing@gmail.com | (415) 897 7977 | Other | Novato · Marin County | — | — |
| Batey Co | Paul Thomas Batey | — | (415) 326 5077 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Bauman Landscape And Construction INC | Michael Paul Bauman | — | (415) 447 4800 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Bay Area Bathroom Remodeling | Bay Area Bathroom Remodeling | — | (415) 424 5969 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Bay Area Moisture Control By Restorex INC | Christopher Alan King | — | (415) 884 0500 | Other | Novato · Marin County | — | — |
| Bay Area Painting | William Jose Miranda | — | (415) 635 9548 | Windows, patio, painters | Novato · Marin County | — | — |
| Bay Area Spotlight Electric | Wenderson Alexandrino | info@bayareaspotlightelectric.com | (415) 299 1128 | Electricians | Sausalito · Marin County | — | — |
| Bay Area Wifi And Networks | Ari-Jon Pratt Laquidara | — | (415) 879 8647 | Other | San Rafael · Marin County | — | — |
| Bay Builders INC | John Richard Cutrufelli | info@baybuilders.com | (415) 798 1629 | GC, remodel, ADU | Novato · Marin County | — | — |
| Bay Building And Remodel | Bay Building And Remodel | — | (415) 382 8260 | GC, remodel, ADU | Novato · Marin County | — | — |
| Bay City Contractors INC | William Keith Brewer | — | (415) 726 7740 | GC, remodel, ADU | Kentfield · Marin County | — | — |
| Bay Electrical Service Technicians | Marcus Emil Cook | — | (415) 722 4247 | Electricians | Novato · Marin County | — | — |
| Bay Ground Control | Bay Ground Control | — | (415) 504 5677 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Bay Pacific Pipeline Incorporated | Kevin Anthony Carew | — | (415) 897 6958 | Other | Novato · Marin County | — | — |
| Bay Ridge Plumbing INC | Ben Andre | — | (415) 672 0390 | Other | San Rafael · Marin County | — | — |
| Bay Summit Construction | Brad Lee Hayes | — | (415) 332 3063 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Bay Tree Woodworks LLC | John Stewart Merrill | john@baytreewoodworks.com | (971) 221 6693 | Other | San Rafael · Marin County | — | — |
| Bayardo Humberto Ardila Orochena | Bayardo Humberto Ardila Orochena | — | (415) 827 9737 | Other | Novato · Marin County | — | — |
| Baybuild LLC | Jacob Stevens Thompson | interested@domainmarket.com | (415) 259 9166 | GC, remodel, ADU | Corte Madera · Marin County | — | — |
| Bayline Electric | Peter Anthony Fay | — | (415) 485 6000 | Electricians | San Rafael · Marin County | — | — |
| Bayline Painting INC | Ian Nicolas Edwards | — | (415) 385 2145 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Bayo Landscaping | Bayo Landscaping | — | (707) 738 2469 | Windows, patio, painters | Point Reyes Station · Marin County | — | — |
| Bayside Builders | Joseph Gerhard Tembrock | interested@domainmarket.com | (415) 884 8078 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Bayside Remodeling And Construction | John Joseph Coyle | — | (415) 879 1634 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Baywest Construction INC | Meherdad K Namiranian | — | (415) 493 6750 | GC, remodel, ADU | Novato · Marin County | — | — |
| Beach Street Builders INC | James Michael Clifford | — | (707) 732 3367 | GC, remodel, ADU | Novato · Marin County | — | — |