| Voltech | Raja Subhi Hamdan | sales@voltech.com | (813) 452 0014 | Electricians | Hayward · Alameda County | — | — |
| Voltrex Electric | Jan Michael Ayon | — | (510) 707 2413 | Electricians | San Leandro · Alameda County | — | — |
| Voltron Electric INC | Gustavo Vega | — | (510) 584 1392 | Electricians | Castro Valley · Alameda County | — | — |
| Voltyx Electric Corp | Timur Tiurin | — | (510) 400 6425 | Electricians | Fremont · Alameda County | — | — |
| Voltyx Services Corp | Aleksandr Garmash | — | (530) 551 2964 | Other | Fremont · Alameda County | — | — |
| Vonnwolf Artistic General Contractor | Vonnwolf Artistic General Contractor | — | (510) 907 0175 | Electricians | Oakland · Alameda County | — | — |
| Voong's Roofing Company INC | Loc A Voong | — | (510) 415 8882 | Other roofers | Hayward · Alameda County | — | — |
| Vorrath Woodworks | Vorrath Woodworks | adamvorrath@gmail.com | (561) 722 3742 | Other | Oakland · Alameda County | — | — |
| Vortex Insulation INC | Donald Edward Cain | info@vortexinsulation.com | (510) 462-8254 | Other | Hayward · Alameda County | — | — |
| Vought Construction INC | Devon Alexander Vought | — | (510) 828 5954 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Vui Ha Landscaping | Cong Van Phan | — | (510) 789 3140 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Vuong's Construction | Nam Cong Vuong | — | (510) 325 7588 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| W A Rose Construction INC | Nancy Gonzalez | — | (510) 444 2723 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| W B Builders INC | Naeem Akram | — | (510) 755 0859 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| W Builder | W Builder | — | (650) 776 6712 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| W G Buildings Construction INC | Walter Obdulio Gomez Garcia | — | (510) 575 7547 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| W Galdamez Construction | Williams De Jesus Galdamaz Lopez | — | (510) 586 7398 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| W J Huth Plumbing | W J Huth Plumbing | — | (510) 465 2007 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| W L Electric INC | Landaverde Wilfredo | — | (650) 464 8091 | Electricians | Hayward · Alameda County | — | — |
| W M Landscaping | W M Landscaping | — | (650) 248 6163 | Windows, patio, painters | Newark · Alameda County | — | — |
| W Orozco Construction INC | Wilfredo Jose Orozco Martinez | — | (510) 512 3689 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| W Universal Construction INC | Zhengyu Wang | — | (626) 519 7999 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| W&z Construction | Zeng Man Li | — | (510) 928 3280 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Waarvik Innovations | Waarvik Innovations | — | (510) 484 3601 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Wagner Construction | Eric Martin Wagner | interested@domainmarket.com | (925) 447 3579 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Wagner Design & Construction | George Barry Wagner | — | (510) 841 4040 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Wahid A Tadros | Wahid A Tadros | — | (925) 461 1500 | Other | Pleasanton · Alameda County | — | — |
| Walee Construction INC | Jianhua Cai | — | (408) 221 5278 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Walker Construction | Bradford Montgomery Walker | — | (415) 254 6913 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Walker Designs | Walker Designs | andrew07walker@gmail.com | (925) 435 7043 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Walker Painting | Walker Painting | — | (510) 841 3027 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Walker Plumbing | Walker Plumbing | — | (925) 443 7562 | Other | Livermore · Alameda County | — | — |
| Wall To Wall Painting | Wall To Wall Painting | — | (510) 825 6210 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Wallis Construction | Nathaniel Austin Wallis | — | (510) 499 4401 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Wally's Plumbing & Leak Detection | Yahyah Mohammad Mayar | — | (415) 710 1234 | Other | Hayward · Alameda County | — | — |
| Walschon Fire Protection INC | Jason Roy Hudgins | — | (650) 594 1588 | Other | Pleasanton · Alameda County | — | — |
| Walter Liebe INC | Walter Paul Liebe | — | (510) 508 4095 | Electricians | Oakland · Alameda County | — | — |
| Walter's Builders INC | Walter Rodrigo Alonzo Recinos | — | (510) 684 1868 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Walters & Wolf | Christopher Michael Wolf | — | (341) 465 2040 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Walters & Wolf Interiors | Christopher Michael Wolf | — | (510) 490 1115 | GC, remodel, ADU | Fremont · Alameda County | — | — |