| W C Word Sheet Metal | W C Word Sheet Metal | — | (209) 681 6268 | HVAC | Modesto · Stanislaus County | — | — |
| W H Gibbs Maintenance Co INC | Robert Jr Chavez | — | (209) 632 7039 | Other | Turlock · Stanislaus County | — | — |
| W L Smith Construction | William Lloyd Smith | — | (209) 484 8674 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| W M Plumbing | W M Plumbing | — | (209) 648 8067 | Other | Turlock · Stanislaus County | — | — |
| W P Wesson & Co INC | Walter Perrin Iii Wesson | wpwesson@wpwesson.com | (209) 529 4900 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| W Zarifi Construction INC | Fahim Afghan | — | (209) 412 5648 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Wallace Floor Covering | Wallace Floor Covering | — | (209) 486 6979 | Other | Modesto · Stanislaus County | — | — |
| Wally Falke's Air Conditioning INC | Richard Wallace Falke | — | (209) 632 7596 | HVAC | Turlock · Stanislaus County | — | — |
| Warfield Construction INC | Andrew Len Morse | — | (209) 380 5365 | GC, remodel, ADU | Hughson · Stanislaus County | — | — |
| Warrens Masonry | Warrens Masonry | — | (209) 204 8673 | Other | Ceres · Stanislaus County | — | — |
| Warrior Works Construction | Joel Ii Machuca | admin@warriorworksconstruction.com | (209) 769 4783 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Water Diversion Techs | Water Diversion Techs | — | (209) 302 0395 | Other | Modesto · Stanislaus County | — | — |
| Water Wiz Pool & Spa Repairs | Robert Lee Jr Humphreys | — | (209) 226 3591 | Pool | Turlock · Stanislaus County | — | — |
| Waterco Plumbing | Waterco Plumbing | — | (209) 968 5360 | Other | Oakdale · Stanislaus County | — | — |
| Waterford Contracting | Matthew David Veneman | — | (209) 874 1386 | GC, remodel, ADU | Waterford · Stanislaus County | — | — |
| Waterford Window & Glass LLC | Erik John Moehrle | — | (209) 874 1716 | Windows, patio, painters | Waterford · Stanislaus County | — | — |
| Waterford Window And Glass | Erik John Moehrle | — | (209) 874 1716 | Windows, patio, painters | Waterford · Stanislaus County | — | — |
| Watson Heating & Air Conditioning | Watson Heating & Air Conditioning | — | (209) 496 6003 | HVAC | Modesto · Stanislaus County | — | — |
| Watts Low Voltage LLC | Steven Daniel Brayden | — | (209) 252 6833 | Other | Riverbank · Stanislaus County | — | — |
| We Can Do - Wcd Electrical INC | John Roger Stevens | — | (209) 918 9895 | Electricians | Oakdale · Stanislaus County | — | — |
| Weatheral & Associates | Ronald Lee Weatheral | — | (209) 840 3305 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Webcore Manufactured Home Specialist INC | Fabian Rodriguez | — | (209) 661 6470 | Other | Patterson · Stanislaus County | — | — |
| Welding Services | Geoffry Stephen Evans | — | (209) 448 6138 | Other | Hughson · Stanislaus County | — | — |
| Welding Solutions & Fabrication | Welding Solutions & Fabrication | — | (209) 988 6518 | Other | Oakdale · Stanislaus County | — | — |
| Weldon Construction | Steven Eugene Weldon | — | (209) 222 1229 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Weldtec Manufacturing INC | Branden Michael Schell | — | (209) 874 3809 | Other | Waterford · Stanislaus County | — | — |
| Weldway Steel Fabrication INC | Gregory Allen Yates | — | (209) 847 8083 | Other | Oakdale · Stanislaus County | — | — |
| Weller Construction And Design INC | Andrew Mario Gregorio | — | (209) 604 2898 | GC, remodel, ADU | Hughson · Stanislaus County | — | — |
| Wells Electric INC | Jason Wayne Wells | — | (209) 543 2357 | Electricians | Hughson · Stanislaus County | — | — |
| West California Construction INC | Carlos Humberto Salcedo Avalos | — | (510) 759 2722 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| West Coast Custom Machinery LLC | Elizabeth Ann Rico | — | (209) 535 7254 | Other | La Grange · Stanislaus County | — | — |
| West Coast Door And Gate INC | James Denmen Patterson | — | (209) 531 2087 | Other | Ceres · Stanislaus County | — | — |
| West Coast Equipment Sales INC | Lewis Edward Baptista | — | (209) 668 9378 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| West Coast Flooring | West Coast Flooring | info@westcoastflooring.com | (209) 595 1950 | Other | Modesto · Stanislaus County | — | — |
| West Coast Improvement Service | Scott Frank Bond | — | (209) 581 5114 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| West Coast Painting | West Coast Painting | — | (209) 581 7477 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| West Coast Roofing | West Coast Roofing | westcoastroofing1994@gmail.com | (424) 667-6770 | Other roofers | Modesto · Stanislaus County | — | — |
| West Side Plumbing | West Side Plumbing | — | (209) 622 5723 | Other | Modesto · Stanislaus County | — | — |
| West Steel & Plastics INC DBA G S T M Construction | Robert Jerome Paul | — | (209) 632 9900 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| West Valley Concrete INC | Bryan Paul Valencia | lemonad@jovanny.ru | (209) 236 7091 | Other | Modesto · Stanislaus County | — | — |