| J A G Roofing | Jose Jesus Sanchez | — | (209) 606 9742 | Other roofers | Ceres · Stanislaus County | — | — |
| J A Ochoa Construction | Jose Antonio Ochoa | — | (209) 988 9920 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| J Ashby Construction INC | Joshua David Ashby | — | (209) 576 2825 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| J B Carpets | J B Carpets | — | (925) 301 7374 | Other | Patterson · Stanislaus County | — | — |
| J B Construction | Jorge Alberto Balderas Torres | — | (209) 496 7991 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| J B D Construction | Jami Byron Dick | — | (209) 595 6991 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| J B Drywall | J B Drywall | — | (408) 640 6119 | Other | Newman · Stanislaus County | — | — |
| J Custom Tile & Granite | J Custom Tile & Granite | — | (209) 345 9181 | Other | Ceres · Stanislaus County | — | — |
| J D S Drywall Specialist | J D S Drywall Specialist | — | (209) 613 3076 | Other | Patterson · Stanislaus County | — | — |
| J D S Tile & Construction INC | Jeff David Ii Souza | — | (209) 544 1633 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| J D Septic Service | Julie Lynn Mc Daniel | — | (209) 852 9619 | Other | La Grange · Stanislaus County | — | — |
| J Douglas Construction | Jacob Douglas Cothran | — | (925) 337 5719 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| J F Drywall | J F Drywall | — | (209) 214 2427 | GC, remodel, ADU | Waterford · Stanislaus County | — | — |
| J F Medeiros Construction INC | Carrie Kris Ann Medeiros | — | (209) 988 7224 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| J I Electric | Isaac James | — | (209) 402 9806 | Electricians | Modesto · Stanislaus County | — | — |
| J J Pipelines Const LLC | Valencia Jose Jurado | — | (408) 881 2210 | Other | Ceres · Stanislaus County | — | — |
| J K B Development INC A California Corporation DBA J K B Energy | James Konrad Brenda | — | (209) 632 2647 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| J L Bray & Son INC | James William Bray | — | (209) 545 2856 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| J L G Concrete Saw Cutting INC | Jose Luis Gutierrez | — | (209) 303 9521 | Other | Modesto · Stanislaus County | — | — |
| J M Construction | James Adam Mason | info@jmconstruction.com | (805) 472-2400 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| J Maniglia Landscape | J Maniglia Landscape | — | (408) 406 4829 | Windows, patio, painters | Oakdale · Stanislaus County | — | — |
| J Martinez Construction INC | Jose Osbaldo Martinez Gonzalez | — | (209) 485 4922 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| J O Assembly Furniture Installation | J O Assembly Furniture Installation | — | (925) 337 6371 | Other | Patterson · Stanislaus County | — | — |
| J Owen Electric | Jerrus Dean Owen | jowenelectric@gmail.com | (209) 568 6222 | Electricians | Modesto · Stanislaus County | — | — |
| J P F Building Service INC | James Peter Ferguson | — | (209) 563 6097 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| J Q Mouldings | J Q Mouldings | — | (209) 968 1445 | Other | Modesto · Stanislaus County | — | — |
| J R Schurkamp | J R Schurkamp | — | (209) 505 4935 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| J R Smith Plumbing Co | Jeremy Ray Smith | — | (209) 505 7229 | Other | Newman · Stanislaus County | — | — |
| J R Wagner Fire Protection | Jon Russell Wagner | — | (888) 325 8544 | Other | Modesto · Stanislaus County | — | — |
| J S J Electric | Scott Joseph Case | — | (209) 551 4600 | Electricians | Modesto · Stanislaus County | — | — |
| J S Plumbing | J S Plumbing | — | (408) 690 5674 | Other | Patterson · Stanislaus County | — | — |
| J S Power Electric INC | Jose Luis Salgado | — | (209) 872 1192 | Electricians | Ceres · Stanislaus County | — | — |
| J S West And Company | Donald Garrison West | info@jswest.com | (209) 577 3221 | HVAC | Modesto · Stanislaus County | — | — |
| J Solis Excavation | J Solis Excavation | — | (209) 652 7841 | Pool | Riverbank · Stanislaus County | — | — |
| J T Electric | Jeffrey David Gabaldon | — | (209) 247 0186 | Electricians | Riverbank · Stanislaus County | — | — |
| J V Home Repair | J V Home Repair | jose@jvhomerepair.com | (562) 475-3032 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| J&j Remodeling INC | Rivera Jesus Tapia | — | (209) 409 4882 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| J&m Hauling Services INC | Urena Javier Alvarez | — | (408) 590 6906 | Other | Turlock · Stanislaus County | — | — |
| Jack Anthony Rocha | Jack Anthony Rocha | — | (209) 996 3407 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Jad | Juan Antonio| Davila Tony Davila | — | (661) 718 9219 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |