| Jg Glazing | Jg Glazing | — | (925) 961 2516 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Jh Construction | Jh Construction | — | (888) 609-5681 | Restoration | Tracy · San Joaquin County | — | — |
| Jim Thorpe Oil INC | Martin James Thorpe | — | (209) 329 5483 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Jima Construction | Alfonso Mancillas Jimenez | — | (209) 623 7734 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Jimenez & Sons Construction INC | Jose Iii Jimenez | — | (209) 483 1722 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Jimenez Masonry | Jimenez Masonry | — | (925) 525 3385 | Other | Lathrop · San Joaquin County | — | — |
| Jjm Custom Builder | Jjm Custom Builder | — | (209) 594 4533 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Jk Electrical Services INC | John Nunez | — | (209) 943 1046 | Electricians | Lodi · San Joaquin County | — | — |
| Jko Painting & Decoration INC | Flores Jose Castaneda | — | (925) 848 5523 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Jl Construction | Jose Luis Jr Hernandez | — | (209) 752 0220 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Jl Endeavor Construction | Jesus Alberto Lopez Escareno | — | (209) 687 4099 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Jm Matthews Construction INC | Joshua Michael Matthews | — | (209) 323 9589 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Jm Painting | Jose Ulises Menchu Lopez | — | (650) 850 1562 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Jm Roofing Solutions | Julio Eduardo Murguia Flores | — | (209) 263 8782 | Other roofers | Lodi · San Joaquin County | — | — |
| Jmart Pro Electric | Juan Manuel Martinez | — | (209) 679 5140 | Electricians | Manteca · San Joaquin County | — | — |
| Jmj Appliance Install | Gonzalez Juan Padilla | — | (510) 689 6686 | Other | Lathrop · San Joaquin County | — | — |
| Jmm Heating And Air | Jmm Heating And Air | — | (209) 601 0704 | HVAC | Manteca · San Joaquin County | — | — |
| Job Masters Construction INC | Jose Pedro Flores | — | (510) 688 3191 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Joe Atler Painting | Joe Atler Painting | — | (209) 329 4883 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| Joe Martin | Joe Martin | — | (209) 495 8526 | GC, remodel, ADU | Linden · San Joaquin County | — | — |
| Joe Velasco Landscape | Joe Velasco Landscape | — | (707) 333 3272 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Joe Vierra Construction | Joseph Robert Vierra | — | (209) 321 5086 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Joey Preszler | Joey Preszler | — | (209) 334 0506 | Electricians | Lodi · San Joaquin County | — | — |
| Johan's Landscaping Services | Gomez Rosendo Soberanis | — | (510) 274 3758 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| John D Kane Construction | John David Kane | — | (209) 601 2282 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| John D Wait Masonry INC | John Donald Wait | — | (209) 334 6722 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| John Dos Reis Construction | John Leonard Dos Reis | — | (209) 810 0105 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| John Esteves DBA Johnny's Plumbing | John Esteves DBA Johnny's Plumbing | — | (209) 599 2667 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| John F Rosasco Welding | John F Rosasco Welding | — | (209) 481 6093 | Other | Stockton · San Joaquin County | — | — |
| John Gudino Painting And Waterproofing | John Gudino Painting And Waterproofing | — | (415) 290 8381 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| John Harrison INC | John Harrison Schulz | — | (209) 470 3908 | HVAC | Stockton · San Joaquin County | — | — |
| John Minaudo Construction INC | John David Minaudo | — | (209) 823 0829 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| John Muhlbeier Painting | John Muhlbeier Painting | — | (209) 986 2169 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| John N Eddies Tree Care INC | John Austin Jr Scott | — | (209) 479 0251 | Other | Stockton · San Joaquin County | — | — |
| John N Meintasis | John N Meintasis | — | (209) 403 3708 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| John Pacelli | John Pacelli | — | (209) 993 7109 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| John Rivera | John Rivera | — | (408) 561 3109 | Other | Tracy · San Joaquin County | — | — |
| John Robert Boisseranc | John Robert Boisseranc | — | (408) 489 0274 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| John Sikkema Construction INC | John Lambert Sikkema | — | (209) 599 1573 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| John Williams Underground Sewer | John Roger Jr Williams | — | (209) 401 4323 | Other | Stockton · San Joaquin County | — | — |