| West-cal Painting INC | Oskar Danilo Vargas | contact@westcalpainting.com | (916) 270 8700 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Westcon Construction Corp | Eric Francis Campbell | employment@westconconstruction.com | (916) 663 2425 | GC, remodel, ADU | Newcastle · Placer County | — | — |
| Western Baler & Conveyor INC | Daniel Ray Stewart | — | (916) 408 6996 | Other | Rocklin · Placer County | — | — |
| Western Care Construction Company INC | Mitchell Montana Gaskey | — | (916) 622 5491 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| Western Engineering Contractors INC | Don J Carroll | — | (916) 652 3990 | Other | Loomis · Placer County | — | — |
| Western Low Voltage INC | Charlie Clifford Swanson | info@westernlv.com | (916) 549 3084 | Other | Roseville · Placer County | — | — |
| Western Property Contractors | Thomas James Mc Carthy | — | (916) 257 9615 | GC, remodel, ADU | Granite Bay · Placer County | — | — |
| Western Renovations INC | Yevgeniy Shestopal | — | (916) 200 9435 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Western Star Plumbing INC DBA Western Star Construction | Shevchenko Vitalii | — | (916) 917 2076 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| Western States Audio Video INC | Garry James Sewell | — | (916) 300 6485 | Other | Auburn · Placer County | — | — |
| Western States Concrete Construction INC | Brian Keith Walker | — | (916) 248 9593 | Other | Auburn · Placer County | — | — |
| Westin Tile | Westin Tile | jwestin530@gmail.com | (530) 210 1474 | Other | Auburn · Placer County | — | — |
| Westlake Adu Construction | Scott Michael Westlake | — | (916) 202 6969 | GC, remodel, ADU | Newcastle · Placer County | — | — |
| Westlake Land Management LLC | Jaysen Carl Westlake | jaysenwestlake@westlakelandmanagement.net | (916) 872 3676 | Other | Penryn · Placer County | — | — |
| Westphalen Construction | Christopher George Westphalen | chris@westphalenconstruction.com | (916) 910 5380 | GC, remodel, ADU | Auburn · Placer County | — | — |
| Westridge Builders INC | Jeron James Chamberlain | — | (916) 660 9919 | HVAC | Loomis · Placer County | — | — |
| Westridge Painting | Westridge Painting | — | (916) 228 0163 | Windows, patio, painters | Rocklin · Placer County | — | — |
| Westworld Coatings INC | Chad Ryan Rivett | chad@westworldcoatings.com | (530) 305 4308 | Windows, patio, painters | Auburn · Placer County | — | — |
| Wet Paint Company | Richard Shawn Orbea | online@wetpaint.com | (916) 439 2049 | Windows, patio, painters | Auburn · Placer County | — | — |
| Wetland Establishment Team | Wetland Establishment Team | — | (916) 952 0308 | Other | Sheridan · Placer County | — | — |
| Wexford Builders INC | Yalanji Olesya | — | (916) 284 4998 | GC, remodel, ADU | Newcastle · Placer County | — | — |
| Whaley Custom Tile Work | Whaley Custom Tile Work | — | (775) 848 7825 | Other | Tahoe Vista · Placer County | — | — |
| Whelan Water Works | Whelan Water Works | — | (530) 525 6345 | Pool | Tahoma · Placer County | — | — |
| When It Mattrs INC | Matthew Joseph Rua | — | (916) 532 7760 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Whest Koast Plumbing | Whest Koast Plumbing | — | (916) 435 4020 | Other | Rocklin · Placer County | — | — |
| White Cap Coastal INC | Ronald David Bettencourt | — | (530) 745 9990 | GC, remodel, ADU | Auburn · Placer County | — | — |
| White Dog Construction And Remodeling | Brett Wayne Johnson | — | (916) 208 8508 | GC, remodel, ADU | Loomis · Placer County | — | — |
| White Knight Electric | Ronald Wayne Meidinger | — | (916) 496 0181 | Electricians | Lincoln · Placer County | — | — |
| White Oak Landmanagement | Jack Lee Arnswald | — | (530) 906 1338 | GC, remodel, ADU | Meadow Vista · Placer County | — | — |
| White Panda Painting & Remodeling | White Panda Painting & Remodeling | — | (916) 899 8991 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| White Star Construction INC | Diane Savage | — | (916) 771 3738 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Whitmores Windows And Glass Doors INC | Andrew David Whitmore | — | (415) 902 1656 | Windows, patio, painters | Rocklin · Placer County | — | — |
| Whittington Electric INC | Todd Michael Whittington | — | (530) 305 5403 | Electricians | Auburn · Placer County | — | — |
| Wholeshot Painting | Wholeshot Painting | — | (916) 223 2487 | Windows, patio, painters | Loomis · Placer County | — | — |
| Wicomm INC | James Robert Benja Hite | — | (916) 223 9390 | Electricians | Lincoln · Placer County | — | — |
| Widespread Landscape And Maintenance | Matthew John Sonka | — | (530) 386 2337 | Windows, patio, painters | Tahoe City · Placer County | — | — |
| Wigton & Son Excavation | Collin Grant Wigton | — | (559) 217 1640 | Other | Colfax · Placer County | — | — |
| Wild Wood Flooring | Wild Wood Flooring | — | (916) 402 4931 | Other | Granite Bay · Placer County | — | — |
| Wildie Carpet Repair Specialist | Nordell Vernon Wildie | — | (916) 425 7212 | Other | Roseville · Placer County | — | — |
| Wildland Earthworks | John Lucas Anthon Reite | — | (916) 626 9222 | Other | Loomis · Placer County | — | — |