| Woodworks Construction INC | Paul William Wood | — | (209) 747 3855 | GC, remodel, ADU | Woodbridge · San Joaquin County | — | — |
| Wright Process Systems | Kristina Lynn Wright | — | (209) 369 2795 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Wrigleys Pool Service And Repair | Shane Thomas Wrigley | — | (925) 478 7665 | Pool | Mountain House · San Joaquin County | — | — |
| Wy Construction INC DBA Pacific Construction | Yu Wilson | — | (209) 477 2766 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Wyatt Horn Construction | Wyatt Edward Horn | — | (209) 452 5292 | GC, remodel, ADU | Victor · San Joaquin County | — | — |
| Wyman Construction | Ronald Mitchell Wyman | — | (209) 481 0491 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Xc Torres Construction | Miguel Angel Bonilla | — | (209) 683 6284 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Xcel Engineering Corporation | Zachariah Raymond Plagenza | — | (559) 458 3708 | Other | Ripon · San Joaquin County | — | — |
| Xilohua Homes LLC | Josias Isai Xilohua Perez | — | (209) 227 9062 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Yanez Pump Service | Rigoberto Maldonado Yanez | — | (209) 818 5564 | Other | Stockton · San Joaquin County | — | — |
| Yard Creations Landscape Services INC | Kenneth D Douglas | — | (209) 815 3309 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| Yardscape Construction INC | Joel Eric Anderson | — | (209) 992 0918 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Yellow Hat Construction INC | Ahmad Jawad Mohammadi | — | (510) 479 6565 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Yhwh Construction | Jerry Lee Syrovatka | — | (209) 406 2523 | Electricians | Stockton · San Joaquin County | — | — |
| Yi Chen | Yi Chen | — | (650) 787 6171 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Yl Flooring INC | Vazquez Jesus Lopez | — | (209) 430 8233 | Other | Stockton · San Joaquin County | — | — |
| Yong Cong Chen | Yong Cong Chen | — | (209) 406 2016 | HVAC | Stockton · San Joaquin County | — | — |
| Yordy Sprinkler Services | Jasen Alan Yordy | yordygarden@gmail.com | (209) 688 0266 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Z T Construction | Zachary Edward Trammell | — | (209) 712 7990 | GC, remodel, ADU | Acampo · San Joaquin County | — | — |
| Zalunardo Electric INC | Christopher Joseph Zalunardo | — | (209) 823 2525 | Electricians | Manteca · San Joaquin County | — | — |
| Zamora Construction | Zepeda Zamora Rene | contact@sansoxygen.com | (925) 260 9652 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Zavala Construction | Jose Roberto Zavala | — | (925) 474 7042 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Zaved Buksh Flooring | Zaved Buksh Flooring | — | (209) 627 8592 | Other | Tracy · San Joaquin County | — | — |
| Zayah Construction Company INC | Gustavo Garcia | — | (209) 517 6195 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Zills Tile INC | Ronald Dean Ziller | — | (209) 836 2242 | Other | Tracy · San Joaquin County | — | — |
| Zins Construction | George Bernard Iv Zins | — | (209) 327 5156 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Zion Roofing | Demetrio Santos Escobar Delgado | jean.dupont@gmail.com | (209) 715 1500 | Other roofers | Stockton · San Joaquin County | — | — |
| Zivko Mise Painting | Zivko Mise Painting | — | (209) 727 5044 | Windows, patio, painters | Lockeford · San Joaquin County | — | — |
| Zm Carpentry | Zm Carpentry | — | (209) 346 4456 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |