| Brian Burd DBA Bb Plumbing | Brian Burd DBA Bb Plumbing | — | (415) 720 6225 | Other | Corte Madera · Marin County | — | — |
| Brian Knutson Carpentry | Brian Knutson Carpentry | — | (415) 246 4834 | GC, remodel, ADU | Novato · Marin County | — | — |
| Brian Scott Construction LLC | Brian Elliott Scott | — | (415) 686 3050 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Brian Thomas Caveney Builder | Brian Thomas Caveney Builder | — | (415) 806 5987 | GC, remodel, ADU | Novato · Marin County | — | — |
| Briese Co INC | Conor Austin Briese | — | (415) 686 0004 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Bright Connections Electrical Co | Michael Frederic Winand | — | (415) 307 1585 | Electricians | San Rafael · Marin County | — | — |
| Brizuela Tile & Stone | Oscar Alberto Brizuela Ramirez | — | (707) 880 4499 | Other | Point Reyes Station · Marin County | — | — |
| Brodie INC | George Dennis Giannos | — | (847) 345 7234 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Brookdale Customs | Brookdale Customs | — | (415) 845 4757 | GC, remodel, ADU | Novato · Marin County | — | — |
| Brooks Tree Care | Brooks Tree Care | — | (415) 388 1232 | Tree | Tiburon · Marin County | — | — |
| Brownco Construction & Development INC | Joseph Andrew Brown | — | (415) 721 0465 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Browy Construction | Derek Stephen Browy | — | (510) 561 6484 | GC, remodel, ADU | Novato · Marin County | — | — |
| Bruce Buckingham Mc Lellan | Bruce Buckingham Mc Lellan | — | (415) 559 8962 | GC, remodel, ADU | Ross · Marin County | — | — |
| Bruce Fogle Painting | Bruce Fogle Painting | — | (415) 847 1474 | Windows, patio, painters | San Rafael · Marin County | — | — |
| Bryan Mc Cue DBA Craftcare Hardwood Floors | Craftcare Hardwood Floors | — | (415) 453 6330 | Other | San Rafael · Marin County | — | — |
| Bryce C B Construction INC | Cameron Robert Bryce | — | (415) 505 0039 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Buchholz Landscaping Company | John Joseph Buchholz | — | (628) 259 2165 | GC, remodel, ADU | Novato · Marin County | — | — |
| Buckley Construction & Diving Services | Terence Stephen Buckley | — | (415) 850 2043 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Buckminster Design Build | Buckminster Design Build | — | (415) 342 0036 | GC, remodel, ADU | Forest Knolls · Marin County | — | — |
| Buder's Henry Landscape Restoration | Buder's Henry Landscape Restoration | — | (415) 460 0381 | Windows, patio, painters | Mill Valley · Marin County | — | — |
| Bug I'd INC | Matthew John Lavine | — | (415) 331 3115 | Other | Sausalito · Marin County | — | — |
| Build It Construction | Gary Walter Hines | — | (415) 378 0793 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Build Shepherd INC | Jordan Michael Weill | jordan@buildshepherd.com | (415) 686 1230 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| Buildergirl Design And Construction | Tina Marie| Mullins Tina Marie Humphrey | — | (805) 471 4263 | GC, remodel, ADU | Mill Valley · Marin County | — | — |
| Builders Of Marin | Builders Of Marin | — | (415) 640-3750 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Builditall | Steven Charles Jr Canty | — | (415) 272 6902 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Buildright Services Group LLC | Lawrence Lee Kennedy | — | (415) 539 9957 | GC, remodel, ADU | Sausalito · Marin County | — | — |
| Bulldog Construction & Maintenance INC | Simon Gerard Coyle | — | (916) 220 5550 | GC, remodel, ADU | Tiburon · Marin County | — | — |
| Bunnell Builders INC | Bruce Richard Bunnell | — | (415) 860 0796 | GC, remodel, ADU | Fairfax · Marin County | — | — |
| Burke Construction | Patrick Michael Burke | interested@domainmarket.com | (415) 601 0949 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| Burkell Plumbing INC | Jacob Irwin Newman | — | (415) 332 3091 | HVAC | Sausalito · Marin County | — | — |
| Buzzer 9 Development INC | Peter Abraham Rosenthal | — | (415) 816 4410 | Electricians | Sausalito · Marin County | — | — |
| By Design Paint & Stain | By Design Paint & Stain | — | (415) 497 6917 | GC, remodel, ADU | Novato · Marin County | — | — |
| Byron Huang Construction | Byron Chung-yee Huang | — | (415) 948 9918 | GC, remodel, ADU | San Anselmo · Marin County | — | — |
| C & J's Custom Builds INC | Caleb Zachariah Wyman | — | (415) 209 8439 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| C 4 Paint And Design INC | Conor Michael Burns | — | (415) 845 8209 | Windows, patio, painters | Mill Valley · Marin County | — | — |
| C A Duffy Construction | Columba Anthony Duffy | — | (415) 497 0353 | GC, remodel, ADU | San Rafael · Marin County | — | — |
| C Jones Painting | C Jones Painting | — | (415) 902 5281 | Windows, patio, painters | Corte Madera · Marin County | — | — |
| C K Electrical And Construction | Christopher James Knoll | — | (415) 672 4389 | Electricians | Mill Valley · Marin County | — | — |
| C K Plumbing | C K Plumbing | — | (415) 246 1691 | Other | Woodacre · Marin County | — | — |