| Buckley Construction | Shawn Michael Buckley | — | (707) 486 3294 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Buckley Heating & Air Conditioning INC | David Lee Buckley | — | (707) 795 5755 | HVAC | Cotati · Sonoma County | — | — |
| Budd Elliff | Budd Elliff | — | (707) 546 6900 | Other | Windsor · Sonoma County | — | — |
| Budget Blinds Of Petaluma | Thomas Anthony Rennia | — | (707) 766 0885 | Other | Cotati · Sonoma County | — | — |
| Budget Landscape And Maintenance INC | Todd Nicholas Graveson | — | (707) 837 0547 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Buena Vista Company | Michael Ladd Kesecker | hello@buena-vista.com | (707) 838 6291 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Build Fix Experts INC | Paniagua Mauricio Guido | — | (707) 477 9865 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Build Well Construction | Sidorjak Karel | — | (510) 847 2885 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Build Wright | Build Wright | — | (415) 847 6524 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Builders Construction Enterprise | Glenda Ann Mc Govern | — | (707) 480 6155 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Building From The Heart | Building From The Heart | — | (415) 577 6666 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Building Repair & Management INC | Christian Michael Andersen | — | (707) 527 8797 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Built Rock Solid | Built Rock Solid | — | (707) 889 0096 | Other | Rohnert Park · Sonoma County | — | — |
| Built With Grace INC | Dominic Reynaldo Davila | mike@builtwithgrace.com | (707) 933 6061 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Builtrite Construction LLC | Adrian Dow Derenzy | — | (707) 591 3052 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Bullet Construction | Todd Joseph Brown | — | (707) 508 5341 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Burbank Housing Development Corporation | Larry Phillip Boughton | — | (707) 526 9782 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Burchett's Heating & Cooling | Burchett's Heating & Cooling | — | (707) 669 0539 | HVAC | Cloverdale · Sonoma County | — | — |
| Burger Construction INC | Thomas Joseph Burger | — | (707) 480 8017 | GC, remodel, ADU | Monte Rio · Sonoma County | — | — |
| Burley Tree Service | Ryan George Genung | — | (707) 694 7436 | Other | Sebastopol · Sonoma County | — | — |
| Burton Heating And Air | Burton Heating And Air | — | (707) 318 2628 | HVAC | Santa Rosa · Sonoma County | — | — |
| Buschman Construction LLC | Jeremy Patrick Buschman | — | (707) 318 9007 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| Butler And Sons Construction | Nathan Adam Butler | — | (707) 477 9580 | GC, remodel, ADU | Forestville · Sonoma County | — | — |
| Butler Construction | Skyler Dale Butler | interested@domainmarket.com | (707) 548 0127 | Electricians | Sebastopol · Sonoma County | — | — |
| Butulia's Tile | Ronald Wayne Butulia | — | (707) 794 0166 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Bv Construction | Brent Raymond Vogel | — | (415) 209 3659 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Byrd's Flooring Company | Michael Gene Byrd | — | (831) 325 8359 | Other | Santa Rosa · Sonoma County | — | — |
| Byrn Land Management | Byrn Land Management | — | (707) 304 6416 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Byrnes & Mcclellan Construction INC | Enda Patrick Keane | — | (415) 828 4981 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Byron N Nelson | Byron N Nelson | — | (707) 695 4222 | GC, remodel, ADU | Penngrove · Sonoma County | — | — |
| C & C Contracting | Carlos Christian Jr Chavez | — | (707) 236 2594 | Other | Cotati · Sonoma County | — | — |
| C & J Property Services INC | James Michael Gemperline | — | (707) 696 3696 | GC, remodel, ADU | Healdsburg · Sonoma County | — | — |
| C & S Plumbing & Services | Rebollar Ortega Fernando | — | (707) 843 2329 | Other | Santa Rosa · Sonoma County | — | — |
| C 7 Construction | Ortiz Gustavo | — | (707) 477 5396 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| C A Roll Ups | C A Roll Ups | — | (707) 337 2161 | Other | Sonoma · Sonoma County | — | — |
| C A S Plumbing | C A S Plumbing | — | (707) 322 2646 | Other | Cotati · Sonoma County | — | — |
| C Arenas Masonry Contractor | C Arenas Masonry Contractor | masonryarenas@gmail.com | (707) 228 3414 | Other | Santa Rosa · Sonoma County | — | — |
| C B S Plumbing & Heating INC | Jeremy Scott Albright | — | (707) 585 1171 | HVAC | Santa Rosa · Sonoma County | — | — |
| C C I | Jan Edward Swaney | — | (707) 665 9668 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| C C S Building | C C S Building | — | (707) 696 7571 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |