| Bond Construction | Thomas Ray Shockey | — | (415) 606 4590 | Electricians | Petaluma · Sonoma County | — | — |
| Bonds Custom Painting | Bonds Custom Painting | — | (707) 508 8316 | Windows, patio, painters | Windsor · Sonoma County | — | — |
| Bonnett Bathrooms | Bonnett Bathrooms | — | (707) 696 8737 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Bonney INC DBA Heatwave Systems | Joseph Anthony Boney | — | (707) 939 8482 | HVAC | Sonoma · Sonoma County | — | — |
| Boon Electric | Zayd Muhammed Boon | — | (707) 328 5955 | Electricians | Santa Rosa · Sonoma County | — | — |
| Boost Electric LLC | Omid Michael Boostani | — | (707) 327 8271 | Electricians | Petaluma · Sonoma County | — | — |
| Booth Electric INC | Jacob Gerald Booth | — | (707) 364 4412 | Electricians | Petaluma · Sonoma County | — | — |
| Borchardt Construction | Steven E Borchardt | — | (707) 578 2021 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Borges Brothers Painting | Borges Brothers Painting | — | (707) 318 7426 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Botelho Electric | Kirk Brian Botelho | — | (707) 235 9405 | Electricians | Santa Rosa · Sonoma County | — | — |
| Boudreau Remodeling | Boudreau Remodeling | — | (707) 853 6823 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Bowen Plumbing | Bowen Plumbing | — | (707) 332 7775 | Other | Santa Rosa · Sonoma County | — | — |
| Bowers Plumbing Service | Mel Leroy Bowers | — | (707) 585 8475 | Other | Rohnert Park · Sonoma County | — | — |
| Bowman Electric INC | Douglas George Bowman | — | (707) 974 2341 | Electricians | Santa Rosa · Sonoma County | — | — |
| Boyan Radoslavov Tile & Stone Designs | Boyan Boyanov Radoslavov | — | (707) 287 1614 | Other | Vineburg · Sonoma County | — | — |
| Bozarth Plumbing Co | Brian Roy Bozarth | — | (650) 333 5408 | HVAC | Santa Rosa · Sonoma County | — | — |
| Bracy Electrical Solutions | Cornelius Jr Bracy | — | (707) 571 9689 | Electricians | Santa Rosa · Sonoma County | — | — |
| Brad Brown Landscape INC | Bradley Jonathan| Brown Brad Jonathan Brown | — | (707) 769 1503 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Brad Hanan | Brad Hanan | — | (415) 328 4624 | Electricians | Petaluma · Sonoma County | — | — |
| Brad Roach Plumbing | Brad Roach Plumbing | — | (707) 860 1617 | Other | Petaluma · Sonoma County | — | — |
| Brad Sayre Landscape Service INC | Brad Lee Sayre | — | (707) 571 1154 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Bradley Builders | Bradley Builders | — | (707) 332 0375 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Bradley Tonks Construction Management | Bradley Alfred Tonks | — | (707) 495 6749 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Brady Construction Company | Patrick Joseph Brady | info@bradyconstruction.com | (707) 978 8585 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Bragg Home Services | Rickie Kenneth Chandler | — | (707) 939 6165 | HVAC | Santa Rosa · Sonoma County | — | — |
| Bragg Home Services LLC | John Allen Honey | — | (707) 639 1756 | HVAC | Santa Rosa · Sonoma County | — | — |
| Brandon Carpet Co | Eric Stephen Brandon | — | (707) 823 0166 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Brandon Gardens INC | Deborah Jo Brandon | — | (415) 860 5073 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Brandywine Builders INC | Dustin Amos Gallowa| Y Deason | — | (707) 480 5883 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Bravestar Concrete & Excavating INC | Jesus Nieto Espinoza | — | (707) 889 1619 | Other | Santa Rosa · Sonoma County | — | — |
| Bravo Builds Construction | Christopher Dean Greisen | — | (707) 477 4906 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Bravo Company Restoration Corporation DBA Bravo Restoration And | Nicole Lynn Humber | — | (707) 837 0675 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Bravo Restoration & Construction | Bravo Restoration & Construction | — | (707) 282-5143 | Restoration | Windsor · Sonoma County | — | — |
| Bravo's Fencing And Repair | Bravo's Fencing And Repair | — | (707) 331 4265 | Other | Santa Rosa · Sonoma County | — | — |
| Breakers Electric INC | Michael Lamoyne Frank | — | (707) 481 4270 | Electricians | Petaluma · Sonoma County | — | — |
| Brenton Builders | Brenton Builders | — | (707) 235 8482 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Breslin Construction | Kevin Thomas Breslin | — | (415) 823 1006 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Brester-smith Plumbing | Brester-smith Plumbing | — | (707) 292 5168 | Other | Windsor · Sonoma County | — | — |
| Brett Austin Stapleton | Brett Austin Stapleton | — | (707) 228 7981 | Other | Santa Rosa · Sonoma County | — | — |
| Brett Fairbanks | Brett Fairbanks | — | (707) 495 7396 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |