| J D Firestop Pros INC | Darren Wayne Pollock | estimating@jdfirestoppros.com | (925) 337 8546 | Other | Tracy · San Joaquin County | — | — |
| J D I Electrical Services INC | Ivan Ocon | — | (925) 518 8707 | Electricians | Manteca · San Joaquin County | — | — |
| J D S Backhoe Service | Justin David Smith | — | (209) 992 1507 | Other | Acampo · San Joaquin County | — | — |
| J E Ley Earthmoving LLC | Joe Eugene Ley | — | (209) 815 7192 | Other | Lockeford · San Joaquin County | — | — |
| J G Archer Gen Contractor Services | Archer James | — | (209) 480 9610 | GC, remodel, ADU | Linden · San Joaquin County | — | — |
| J G Electric | James Micheal Galarneau | — | (209) 327 8900 | Electricians | Lodi · San Joaquin County | — | — |
| J H K Construction INC | James Hugh Kulina | — | (209) 838 2970 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| J Haskins General Engineering | J Haskins General Engineering | — | (209) 329 7071 | Other | Clements · San Joaquin County | — | — |
| J J E Construction | Juan Jose Enamorado | — | (209) 594 7643 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J J Pools | J J Pools | — | (209) 647 2967 | Pool | Manteca · San Joaquin County | — | — |
| J J Welding Iron Works | J J Welding Iron Works | — | (209) 598 1704 | Other | Stockton · San Joaquin County | — | — |
| J L Masonry INC | Josh Lawrence Lahman | — | (209) 329 7183 | Other | Woodbridge · San Joaquin County | — | — |
| J L Mays And Son Construction | Jerry Lee Mays | — | (209) 598 3201 | GC, remodel, ADU | French Camp · San Joaquin County | — | — |
| J L P Lion Concrete | J L P Lion Concrete | — | (209) 407 7085 | Other | Manteca · San Joaquin County | — | — |
| J Lazo General Contractor LLC | Lazo Jair | — | (209) 299 1844 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J Lewis Electric | John Edwin Lewis | info@jlewiselectric.com | (209) 642 3057 | Electricians | Lodi · San Joaquin County | — | — |
| J M A Construction | Juan Manuel Acosta | — | (831) 840 6303 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| J M A Construction | James Michael Sr Azevedo | — | (209) 406 9154 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J M Commander | J M Commander | — | (209) 808 9594 | Other roofers | Stockton · San Joaquin County | — | — |
| J M Drywall | J M Drywall | — | (209) 740 2498 | Other | Tracy · San Joaquin County | — | — |
| J M G Construction | Jerry Mitchell Guinn | — | (209) 704 7763 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J M H Fire Protection INC | Juan Manuel Hernandez | — | (833) 564 3473 | Other | Lodi · San Joaquin County | — | — |
| J M I Construction | James Michael Irwin | steve@jmiconstruction.com | (562) 212 8710 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J M I G Construction INC | Jose De Jesus Garcia Galvan | — | (925) 519 0384 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| J M Ornelas Construction INC | Gregory Thomas Malley | — | (408) 598 9324 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J M Romero Construction | Juan Manuel Jr Romero | — | (209) 470 2641 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| J M S Heating Cooling | J M S Heating Cooling | — | (209) 502 9748 | HVAC | Stockton · San Joaquin County | — | — |
| J O A Fence | J O A Fence | — | (408) 665 0711 | Other | Stockton · San Joaquin County | — | — |
| J O B Construction INC | Juan Ortiz | — | (424) 610 0129 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J P Ziller Tile | J P Ziller Tile | — | (209) 321 1201 | Other | Tracy · San Joaquin County | — | — |
| J Paulino Construction INC | Justin John Paulino | — | (408) 656 3748 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| J R Appliance Installation | J R Appliance Installation | — | (209) 712 6758 | Other | Lodi · San Joaquin County | — | — |
| J R C Construction | Joshua Ray Cross | — | (209) 390 2771 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| J R Drywall INC | Jose Ramirez | — | (209) 941 2141 | Other | Stockton · San Joaquin County | — | — |
| J R Drywall Premier INC | Jose Ramirez | — | (209) 470 4042 | Other | Stockton · San Joaquin County | — | — |
| J Rasberry General Engineering | J Rasberry General Engineering | — | (209) 808 8128 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J Reinhardt Electric | J Reinhardt Electric | — | (442) 244-8046 | Electricians | Carlsbad · San Joaquin County | — | — |
| J Roofing | Javier Ruiz Nateras | — | (209) 242 4467 | Other roofers | Stockton · San Joaquin County | — | — |
| J Rose Electric | Jeffery Steven Rose | — | (209) 483 5218 | Electricians | Stockton · San Joaquin County | — | — |
| J S L Construction INC | John Steven| Lopez John Steve Lopez | — | (209) 601 0504 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |