| West Branch Tree Service LLC | Jacob Lee Brownlee | — | (530) 354 2708 | Tree | Magalia · Butte County | — | — |
| West Coast Plumbing | West Coast Plumbing | interested@domainmarket.com | (530) 894 3242 | Other | Chico · Butte County | — | — |
| West Family Homes | Tyler Leland West | — | (530) 966 0617 | GC, remodel, ADU | Paradise · Butte County | — | — |
| Western Door Company | Daniel Paul Metzen | contact@westerndoor.com | (530) 514 2641 | Other | Chico · Butte County | — | — |
| Western Region Designs | Western Region Designs | — | (530) 520 6301 | GC, remodel, ADU | Oroville · Butte County | — | — |
| Western Region Electric | Kyle Allen Butler | — | (530) 966 8445 | Electricians | Oroville · Butte County | — | — |
| Western Site Development | Western Site Development | — | (530) 282 2384 | Other | Yankee Hill · Butte County | — | — |
| Westervelt Well Drilling | Westervelt Well Drilling | — | (530) 589 5990 | Other | Oroville · Butte County | — | — |
| Westgate Hardwoods INC | John Lloyd Caldeira | — | (530) 893 8814 | Other | Durham · Butte County | — | — |
| Weston Electric Co | Jeffrey Albert Grinton | ngassett@westonelectric.com | (530) 526 7898 | Electricians | Chico · Butte County | — | — |
| Whelchel Construction | Kyle Ray Whelchel | — | (530) 893 1628 | GC, remodel, ADU | Chico · Butte County | — | — |
| White Construction Company | Mark Allan White | — | (530) 345 9958 | Other | Chico · Butte County | — | — |
| Wiegand's Water Well Drilling | Wiegand's Water Well Drilling | — | (530) 990 3138 | Other | Oroville · Butte County | — | — |
| Wiks INC | Isaac Warren Anderson | — | (530) 895 1512 | Other | Chico · Butte County | — | — |
| William B Logsdon Const | William B Logsdon Const | — | (530) 592 8080 | GC, remodel, ADU | Chico · Butte County | — | — |
| William Hambleton Electric | William Steven Hambleton | whambletonelectric@gmail.com | (530) 990 8013 | Electricians | Stirling City · Butte County | — | — |
| William Mc Lean Construction | William Paul Mc Lean | — | (530) 624 6427 | GC, remodel, ADU | Chico · Butte County | — | — |
| William Vandegrift Flooring | William Vandegrift Flooring | — | (530) 965 2868 | Other | Paradise · Butte County | — | — |
| Williams Construction | Christopher Louis Williams | — | (530) 701 1546 | GC, remodel, ADU | Gridley · Butte County | — | — |
| Williams Electric | Matt Thomas Williams | info@williams-electric.com | (530) 864 3907 | Electricians | Chico · Butte County | — | — |
| Williams Electric Company | Shannon Debra Williams | info@williams-electric.com | (530) 717 3253 | Electricians | Oroville · Butte County | — | — |
| Wilson's Heating & Air Conditioning LLC | Wade Burdette Sr Wilson | — | (530) 680 4116 | HVAC | Chico · Butte County | — | — |
| Winston Fox Construction | Winston Cody Fox | — | (530) 513 1767 | GC, remodel, ADU | Paradise · Butte County | — | — |
| Wlm Construction INC | William Lane Martin | contact@wlmconstruction.com | (530) 520 5170 | GC, remodel, ADU | Paradise · Butte County | — | — |
| Wolf Bless | Wolf Bless | — | (530) 228 2970 | GC, remodel, ADU | Chico · Butte County | — | — |
| Wolfe Construction | Jeremy David Wolfe | wolfeconstruction@live.co.uk | (530) 717 3967 | GC, remodel, ADU | Chico · Butte County | — | — |
| Woodworks Studio LLC | Joshua Brian Burns | woodworkertracy@gmail.com | (530) 636 3939 | Other | Chico · Butte County | — | — |
| Woolley Mammoth Tree Service | Matthew Martin Woolley | — | (713) 503 4667 | Other | Chico · Butte County | — | — |
| Wragg Electric | Trent Edward Wragg | — | (530) 219 0121 | Electricians | Paradise · Butte County | — | — |
| Wrj Flooring Installer | Wrj Flooring Installer | — | (530) 327 4188 | Other | Paradise · Butte County | — | — |
| Wymore Contracting | David James Wymore | — | (530) 514 2671 | GC, remodel, ADU | Chico · Butte County | — | — |
| X - Ceptional Painting And Decorating | Evan J Knezic | — | (530) 712 7148 | Windows, patio, painters | Chico · Butte County | — | — |
| Yard And Sprinkler By Ernie Cox | Ernest Eugene Cox | — | (530) 514 3041 | Windows, patio, painters | Chico · Butte County | — | — |
| Zak's Norcal Construction | Zachary Robert Brown | — | (530) 567 9549 | GC, remodel, ADU | Biggs · Butte County | — | — |
| Zane Schreder Construction | Zane Michael Schreder | — | (530) 228 9733 | GC, remodel, ADU | Chico · Butte County | — | — |
| Zavala Construction | Joseph Anthony Zavala | — | (650) 771 4874 | GC, remodel, ADU | Paradise · Butte County | — | — |
| Zink Electric Co | Nolan Jay Zink | wweeiihhuuaanngg@gmail.com | (530) 990 9606 | Electricians | Oroville · Butte County | — | — |
| Zion Construction | Caleb Zion Hefty | — | (530) 519 4180 | GC, remodel, ADU | Oroville · Butte County | — | — |