| Berkeley Design Build INC | John Michael Pond | info@berkeleydesignbuild.com | (510) 547 7196 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Berkeley Electric INC | Sher Zalman | — | (510) 548 6992 | Electricians | Berkeley · Alameda County | — | — |
| Berkeley Gardens | Berkeley Gardens | — | (510) 395 1670 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Berkeley Hardwood Flooring | Luis Miguel Jimenez Valdivia | — | (510) 938 4205 | Other | Berkeley · Alameda County | — | — |
| Berkeley Plumbing & Heating Company INC | Vicki Lea Wind | — | (510) 845 8200 | HVAC | Berkeley · Alameda County | — | — |
| Berkeley Roof Services INC | Tae Son Lee | info@berkeleyroofservices.com | (510) 524-2352 | Other roofers | Oakland · Alameda County | — | — |
| Bernardini Engineering | Timothy Ryan Sterrett | — | (650) 458 6356 | Tree | Oakland · Alameda County | — | — |
| Bernardo Acuna Cano | Bernardo Acuna Cano | — | (650) 391 8498 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bertram Harris | Bertram Harris | — | (510) 816 8761 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Bes - Bay Electric Solutions | Rui Sergio De Me Soares | — | (408) 775 2800 | Electricians | San Leandro · Alameda County | — | — |
| Bespoke Construction LLC | Luis Everardo Hernandez | — | (925) 260 9657 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Bespoke Design & Construction | Humberto Adolfo Betancort Tejera | — | (510) 677 2416 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Bess Testlab INC | Martha Cecelia Bohorquez | — | (408) 988 0101 | Other | Hayward · Alameda County | — | — |
| Best Builder INC | Yvonne Ke Cong Lin | — | (510) 386 0805 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Best Epoxy Concrete Coatings | Best Epoxy Concrete Coatings | — | (650) 669 4376 | Other | Fremont · Alameda County | — | — |
| Best Forever Construction Company | Haoyu Tong | — | (415) 342 0308 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Best Glass | Best Glass | — | (510) 708 7064 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Best Shed Ever INC | Arles Joel Garcia Valdez | — | (510) 690 5641 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Best Value Home Improvements | Fereshte Ghorban | — | (415) 433-5000 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Best Water Heaters LLC | Gary Alfred Confenti | — | (510) 378 2221 | Other | Fremont · Alameda County | — | — |
| Beta Electric Services | Karimi Poshtari Ali Reza | — | (510) 396 2268 | Electricians | Pleasanton · Alameda County | — | — |
| Betaskils INC | Francis Njuguna | — | (817) 715 9874 | Electricians | Oakland · Alameda County | — | — |
| Betos Tile And Stone | Betos Tile And Stone | — | (510) 461 2754 | Other | Hayward · Alameda County | — | — |
| Better Building Repairs INC | Patrick M Wharton | — | (925) 479 9500 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Better Built Contractor INC | Steven Andrew Diaz | — | (510) 892 4476 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Better Electric | Tyler James Bowers | better@betterelectric.com | (925) 413 4215 | Electricians | Livermore · Alameda County | — | — |
| Better Solutions Plumbing | Better Solutions Plumbing | — | (510) 290 7164 | Other | Oakland · Alameda County | — | — |
| Beyond Finish Carpentry & Builders | Beyond Finish Carpentry & Builders | — | (415) 725 5321 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Beyond Remodeling INC | Arturo Daniel Jr Pimentel | — | (650) 797 8102 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Beyonergy Electric | Bill Buu A Vuong | info@beyonergyelectric.com | (510) 918 2388 | Electricians | San Leandro · Alameda County | — | — |
| Bg Spa Services | Benjamin Cy Ghelerter | — | (510) 239 7920 | Pool | Berkeley · Alameda County | — | — |
| Bgg Constructions INC | Gutierrez Benjamin | — | (510) 432 6249 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Bhogal Brothers Construction INC | Mandeep Singh Bhogal | — | (510) 468 4620 | Electricians | Hayward · Alameda County | — | — |
| Bhogal Builders And Electric Company | Mandeep Singh Bhogal | — | (510) 516 8845 | Electricians | Union City · Alameda County | — | — |
| Bianchi Concrete And Paving | Bianchi Concrete And Paving | — | (510) 860 7985 | Other | Hayward · Alameda County | — | — |
| Bianchi Construction | Robert Joel Jr Bianchi | — | (510) 825 8054 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Bickel Construction & Painting | Jeffery Kevin Bickel | — | (510) 663 7464 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Bickford's Painting | Bickford's Painting | — | (510) 432 0431 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Biddle Builders LLC | Kevin John Biddle | — | (510) 359 6632 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Biel's Home Improvement | Biel's Home Improvement | — | (925) 200 6363 | GC, remodel, ADU | Livermore · Alameda County | — | — |