| Warren Bellis Construction | Warren Valenzuela Bellis | — | (510) 821 1520 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Water Brooks LLC | Babatunde Olumide Adefolaju | — | (925) 922 0594 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Water Heaters Masters INC | Matthew Hechim | — | (925) 363 4965 | Other | Brentwood · Contra Costa County | — | — |
| Water Service Irrigation Co | Wright Seth | — | (510) 830 8852 | Windows, patio, painters | Crockett · Contra Costa County | — | — |
| Water Services | Christopher Ryan Bash | — | (925) 214 2147 | Other | Walnut Creek · Contra Costa County | — | — |
| Water Tech Systems | Water Tech Systems | interested@domainmarket.com | (925) 820 6875 | Electricians | San Ramon · Contra Costa County | — | — |
| Waterhoss Landscaping | Francisco Manuel Trejo Chanelo | — | (925) 470 6710 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Watson Electric INC | Casey Ben Dias | — | (925) 383 9348 | Electricians | Martinez · Contra Costa County | — | — |
| Wave Construction | Escareno Oscar | — | (510) 599 1440 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Waygreen Construction | Mark Edward Nichols | — | (415) 613 0727 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Wayne E Swisher Cement Contractor INC | Wayne Edgar Swisher | — | (925) 757 3660 | Other | Antioch · Contra Costa County | — | — |
| Wayne Sudweeks DBA Sud Ex Co | Wayne David Sudweeks | — | (925) 525 9905 | Other | Brentwood · Contra Costa County | — | — |
| Wci-gc INC | Jeffrey Philip Perez | — | (925) 256 5900 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Wehrli Construction INC | Walter Ernest Jr Wehrli | — | (209) 814 0632 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Weideman Construction INC | John Eugene Iii Weideman | — | (925) 240 1516 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Wellbuilt Construction INC | Maurice Arthur Wren | — | (510) 501 7741 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Welton Building & Design | Scott Henry Welton | — | (510) 207 5199 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Wendy L Wilson DBA Sugar Town Art Glass | Sugar Town Art Glass | — | (510) 417 8612 | Windows, patio, painters | Crockett · Contra Costa County | — | — |
| Wes Gardner Heating & A/c | Wes Gardner Heating & A/c | — | (925) 212 7327 | HVAC | Alamo · Contra Costa County | — | — |
| Wesdad Custom Painting | Wesdad Custom Painting | — | (510) 816 6834 | Windows, patio, painters | El Cerrito · Contra Costa County | — | — |
| West Builders INC | Nicholas Joseph Mirkovich | — | (510) 307 5678 | GC, remodel, ADU | Point Richmond · Contra Costa County | — | — |
| West Cal Construction | Victor Manuel Del Rio | — | (925) 360 7388 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| West Coast Construction Co | Li Jin | — | (650) 610 0218 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| West Coast Floors Covering | West Coast Floors Covering | — | (510) 685 1518 | Other | El Sobrante · Contra Costa County | — | — |
| West Coast Land And Development INC | Pamela Leslie West | — | (925) 246 2870 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| West Coast Mechanical LLC | Pacio Escorcio | — | (925) 348 7839 | HVAC | Martinez · Contra Costa County | — | — |
| West Coast Painting | West Coast Painting | — | (925) 338 4338 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| West Coast Preservation | West Coast Preservation | — | (925) 595 4668 | GC, remodel, ADU | Knightsen · Contra Costa County | — | — |
| West Coast Roofing & Construction | West Coast Roofing & Construction | alex@westcoastsd.com | (800) 680-7446 | Other roofers | Poway · Contra Costa County | — | — |
| West Coast Sign And Installation | West Coast Sign And Installation | — | (925) 250 5080 | Other | Concord · Contra Costa County | — | — |
| West Coast Water Heaters & Plumbing | Charles Stephen Burleigh | — | (925) 496 9666 | Other | Pittsburg · Contra Costa County | — | — |
| West Coast Waterproofers INC | Ilvania Marilet Wallace | — | (925) 698 1903 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| West Coast Windows & Doors INC | Kelly Ann Mullins | — | (925) 681 1776 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| West Coast Windows And Doors Inc. | West Coast Windows And Doors Inc. | info@westcoastwindowsanddoors.com | — | Windows, patio, painters | Concord · Contra Costa County | — | — |
| West County Handyman | West County Handyman | — | (510) 520 1088 | Electricians | El Cerrito · Contra Costa County | — | — |
| Westapro LLC | Sergei Vladimirovic Gavrish | — | (415) 573 4487 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Westbury Handcrafted Iron Works | Westbury Handcrafted Iron Works | — | (925) 383 1276 | Other | Pittsburg · Contra Costa County | — | — |
| Westco Electric INC | Clark Richard West | — | (925) 285 1067 | Electricians | Concord · Contra Costa County | — | — |
| Westcold Services | Juan Carlos Cadena Sanchez | — | (510) 518 8149 | HVAC | San Pablo · Contra Costa County | — | — |
| Western Construction | Dale Leonard Marcellini | — | (925) 250 4153 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |