| Woodland Construction Builders INC | James Steven King | — | (209) 545 1987 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| Woods Construction Co | Samuel Iii Woods | — | (209) 652 8960 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Woody's Poultry Supply | Richard William Dias | — | (209) 634 2948 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| World Painting | World Painting | — | (209) 404 3389 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| World Technology Solutions | World Technology Solutions | info@worldtechnologysolutions.com | (209) 606 3743 | Other | Modesto · Stanislaus County | — | — |
| World Tile Designs | World Tile Designs | — | (209) 996 1040 | Other | Riverbank · Stanislaus County | — | — |
| World Wide Const | World Wide Const | — | (209) 818 7088 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Wright Construction A Partnership | Michael Louis Rommel | — | (209) 527 7760 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Wrights Cabinets & Tops INC | Sallie Marie Wright | — | (209) 312 4787 | Other | Empire · Stanislaus County | — | — |
| Wyrick Construction And Management INC | Erica Dawn Wyrick | — | (209) 380 3837 | GC, remodel, ADU | Riverbank · Stanislaus County | — | — |
| Xalisco Construction INC | Carlos Delgado | — | (209) 402 1388 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| Xclusive Floor Covering INC | Edgar Esban Garcia | — | (209) 277 3638 | Other | Modesto · Stanislaus County | — | — |
| Xpress Construction | Sanh Van Le | — | (209) 988 9408 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Xpress Heating & Air | Xpress Heating & Air | — | (209) 549 0345 | HVAC | Modesto · Stanislaus County | — | — |
| Xtreme Designs General Builder Contractor INC | Juan Carlos Hernandez | — | (209) 605 8024 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Yates Wastewater Services INC | Billy Jack Park | — | (209) 678 6342 | Other | Denair · Stanislaus County | — | — |
| Yeoman Electric INC | Samuel Martin Yeoman | syeomanelectric@gmail.com | (209) 918 7155 | Electricians | Modesto · Stanislaus County | — | — |
| Ymc Builders LLC | Yovani Antonio Maya Carmona | — | (510) 313 3841 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| Yonan's Heating & Cooling | Yonan's Heating & Cooling | — | (209) 613 1623 | HVAC | Modesto · Stanislaus County | — | — |
| Your Honest Plumber | Your Honest Plumber | — | (209) 232 0619 | Other | Modesto · Stanislaus County | — | — |
| Yourk Heating And Air Conditioning | Yourk Heating And Air Conditioning | — | (209) 604 0405 | HVAC | Modesto · Stanislaus County | — | — |
| Z & S Garden Service | Vargas Zenaido | — | (209) 614 8791 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Zach Bishop Masonry | Zach Bishop Masonry | — | (209) 479 5540 | Other | Waterford · Stanislaus County | — | — |
| Zack's Handyman & Construction | Nathan Zackery Perkins | — | (209) 634 4477 | GC, remodel, ADU | Denair · Stanislaus County | — | — |
| Zamora Epoxy Coatings LLC | William Zamora | — | (209) 342 7912 | Other | Modesto · Stanislaus County | — | — |
| Zamoras Landscape | Zamoras Landscape | — | (209) 402 5548 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Zanini's Custom Cabinets INC | Dennis Henry Zanini | — | (209) 571 3278 | Other | Modesto · Stanislaus County | — | — |
| Zapien Electric INC | Joseph Patrick| Zapien Joe Zapien | impallari@gmail.com | (209) 538 9050 | HVAC | Ceres · Stanislaus County | — | — |
| Zaragoza Gold Construction INC | Correa Jorge Varela | zaragozagoldconstruction01@gmail.com | (707) 596 2089 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Zephyr Built Construction | Giovanni Richard Damato | — | (805) 415 7354 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Zion Mazonry Company | Alvarez Anaya Saul | — | (209) 424 0150 | Other | Modesto · Stanislaus County | — | — |
| Zkb Finish Carpentry | Zkb Finish Carpentry | — | (209) 735 1661 | Other | Turlock · Stanislaus County | — | — |