| Walters & Wolf Precast | Randall Alan Wolf | — | (341) 465 2040 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Walts Electric | Walter Omar Hernandez | waltselectric68@gmail.com | (510) 708 0805 | Electricians | Hayward · Alameda County | — | — |
| Wang Electric | Wang Chi-ping | — | (510) 352 6819 | Electricians | San Leandro · Alameda County | — | — |
| Wangs Contractor LLC | Shi Chung Lok | — | (510) 962 1858 | HVAC | Union City · Alameda County | — | — |
| Wanly Construction | Guo Min Li | — | (925) 854 9638 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| War Horse Construction | Alfredo Jr Gonzalez | — | (510) 750 7582 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Warhurst Construction-general Builder | Blane Evan Warhurst | — | (510) 537 1308 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Warrior Plumbing And Drain INC | Joseph Enrique Esquivel | — | (650) 290 1335 | Other | Hayward · Alameda County | — | — |
| Warriors Plumbing | Warriors Plumbing | — | (510) 467 4536 | Other | Oakland · Alameda County | — | — |
| Washburn Zoe & Maybeck | Washburn Zoe & Maybeck | — | (510) 812 4945 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Water Damage Solution INC | Karol Skuza | — | (510) 362 5979 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Water Doctor Pool Service | Christopher John Peoples | — | (510) 381 0685 | Pool | Pleasanton · Alameda County | — | — |
| Water Heater Company | Gerard Curtis De Miguel | — | (510) 962 1227 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Water Less Landscape INC | Vu Xuan Nguyen | — | (925) 673 1148 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Water Wise Landscaping | Water Wise Landscaping | — | (510) 985 0148 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Water Works Plumbing Company | Gregory Francis Slovik | — | (510) 886 2898 | Other | Hayward · Alameda County | — | — |
| Waterfront Construction INC | Wang Jinfeng | — | (510) 366 9020 | Electricians | Union City · Alameda County | — | — |
| Watermark Builders INC | Barbara Louise Miller | info@watermark-builders.com | (925) 648 4735 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Waterscape Co | Harry Fay Hom | — | (510) 414 6262 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Watersprout INC | John Reiner Russell | — | (888) 556 3669 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Watkins Landscape INC | Luis Facha | — | (510) 552 0022 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Watts Construction | Albert Martin Watts | — | (510) 813 9157 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Waves Above LLC | Matt | info@wavesabove.com | (415) 640 0202 | Pool | Oakland · Alameda County | — | — |
| Waveworks Av INC | Bradley Steven Katz | — | (415) 250 5502 | Other | Oakland · Alameda County | — | — |
| Wayfare Painting Company | Alex John Toledo | — | (510) 754 7632 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Wayland Construction | Wayland Christoph Engle | — | (559) 476 6973 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Wayne Burkholder Construction | Wayne Lee Burkholder | — | (925) 963 2506 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Wayne's Construction Co | Yong Xiong Xu | — | (510) 856 8539 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Wb Concrete | Wb Concrete | — | (510) 209 0130 | Other | Union City · Alameda County | — | — |
| Wbe Construction & Metals INC | Victor Lawrence Rollandi | — | (510) 282 5026 | Other | Alameda · Alameda County | — | — |
| We Can Do It Plumbing | Lauren Elizabeth Carbonell | — | (510) 556 8630 | Other | Oakland · Alameda County | — | — |
| We Love Small Jobs Handyman Services-remodelers & Builders | Moorice Nafshi Tarik El | — | (510) 251 2200 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| We O'neil Construction Co Of Norcal | John Weldon Hackett | — | (925) 466 2990 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Web Home | Web Home | — | (510) 928 1666 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Webbe Jones Joinery | Webbe Jones Joinery | — | (415) 730 3717 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Webcor Construction L P | John Gibb Reynolds | — | (510) 748 1900 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Webcor Craft L P | Christian Andrew Plue | — | (510) 748 1900 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Webcor Obayashi Joint Venture | Corporation Obayashi | — | (510) 748 1900 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Webcor Sundt Jv | Construction INC Sundt | — | (510) 748 1900 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Webss Construction INC | Duc Vi Truong | info@webssconstruction.com | (510) 332 1437 | GC, remodel, ADU | Oakland · Alameda County | — | — |