| Westco Iron Works INC | Bradley James Thompson | info@westcoironworks.com | (925) 271 3500 | Other | Livermore · Alameda County | — | — |
| Westco Roofing Company INC | Tae Son| Lee Mike Lee | nelsa@westcoroofing.com | (510) 533 5270 | Other roofers | Oakland · Alameda County | — | — |
| Westeren Construction LLC | Isaac Rion Andrade | — | (925) 519 4422 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Westerlund Custom Painting | Westerlund Custom Painting | — | (650) 669 1110 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Western Abatement INC | Todd Francis Hurley | info@westernabatement.com | (925) 485 3660 | Other | Livermore · Alameda County | — | — |
| Western Building And Power | Western Building And Power | — | (510) 228 9554 | Electricians | Oakland · Alameda County | — | — |
| Western Contractors | Kausil Deo Singh | — | (510) 798 6186 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Western Gradall Rentals | Western Gradall Rentals | — | (925) 862 0335 | Other | Sunol · Alameda County | — | — |
| Western Modern Construction INC | Xiao Guang Xie | — | (510) 560 2977 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Western Painting & Improvements | Western Painting & Improvements | — | (510) 522 1318 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Western Roofing Service | Erica Denise Thompson | — | (510) 686 4951 | Other roofers | San Leandro · Alameda County | — | — |
| Western Services And Western Cooling | Aden Durrett Watts | — | (415) 779 2887 | HVAC | Pleasanton · Alameda County | — | — |
| Western Slope | Eli Shippen Dwight | — | (510) 210 3976 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Western State Design Construction Company | Thomas Clay Marks | — | (510) 786 9271 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Western Traffic Supply INC | Edward Emilio Ibanez | — | (925) 249 1854 | Other | Pleasanton · Alameda County | — | — |
| Westpac Glass | Daniel Earl Moore | — | (925) 371 9900 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Whatcha Growin | Whatcha Growin | whatchagrowin@gmail.com | (510) 301 9782 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Wheeler Design Build | Ezra Ingvald Wheeler | — | (510) 316 9439 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Whips Chimney Service INC | Matthew Bryan Frost | — | (925) 443 4991 | Other | Livermore · Alameda County | — | — |
| White Colors Painting LLC | Albino Junior Guzman Alonzo | — | (510) 815 0108 | Windows, patio, painters | Oakland · Alameda County | — | — |
| White Eagle General Construction INC | Alfredo Sr Salazar Molina | — | (510) 866 8543 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| White House Painting | White House Painting | — | (415) 299 0819 | Windows, patio, painters | Oakland · Alameda County | — | — |
| White Rose Landscaping INC | Jose D Rodriguez | — | (408) 417 4378 | Windows, patio, painters | Union City · Alameda County | — | — |
| Whitefin Compressed Cleaning INC | Miriam Michelle Franco | — | (925) 214 7557 | Other | Oakland · Alameda County | — | — |
| Whitelaw Glass And Aluminum | Whitelaw Glass And Aluminum | — | (925) 989 8947 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Whitney Builders INC | Whitney Ives Collins | — | (510) 419 0553 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Whollycraft INC | Max Jaushan Chen | — | (510) 946 9332 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Widger Handyman Services | Larry Arthur Widger | — | (925) 786 5856 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Wilcon INC | William Roy Duterte | — | (925) 876 9423 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Wild Thistle Gardens INC | Annikah Desiree Peabody | annikah@wildthistlegardens.com | (646) 575 5563 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Wilder Ventures | Ryan Joseph Eula | — | (510) 397 6506 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Wiley Construction | Thomas Lee Wiley | wiley@wileyconstruction.com | (510) 304 9788 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Wilkerson's Carpet INC | Jeffrey Charles Wilkerson | — | (510) 414 2659 | Other | Oakland · Alameda County | — | — |
| Wilko Builders LLC | Patrick James Jr Kolodziejczak | info@wilkobuilders.com | (510) 213 2049 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Will Do It Construction | Christopher Leon Witherspoon | — | (510) 562 0162 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Will's Construction | Lee William | — | (510) 325 4293 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| William & Reed LLC | Cyril William Grimsich | press@wrbm.com | (510) 387 3114 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| William Anthony Weber Ii | William Anthony Weber Ii | — | (510) 557 5992 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| William D White Co | Aria L White | — | (510) 658 8167 | Electricians | Oakland · Alameda County | — | — |
| William E Lutz | William E Lutz | — | (510) 760 4966 | Other | Pleasanton · Alameda County | — | — |