| Interior Trim Specialists INC | Rodney James Clements | — | (209) 983 8540 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Interior Trim Systems INC | Bradley Stephen Clements | — | (209) 983 8540 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Interiors West Remodeling | Interiors West Remodeling | — | (209) 779 4040 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Interstate Concrete Pumping Co INC | Shawn James Slate | — | (209) 983 3092 | Other | French Camp · San Joaquin County | — | — |
| Intricate Building And Restoration INC | Michael T C Iii Coleman | — | (209) 450 9981 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Ion Electrical Services INC | Paul Alexandru Ionica | — | (925) 705 3700 | Electricians | Mountain House · San Joaquin County | — | — |
| Ipf Construction LLC | Larry Dean Hardison | — | (925) 393 2873 | Other | Stockton · San Joaquin County | — | — |
| Iron Valley Plumbing INC | Jose Heriberto Carbajal | ironvplumbing@gmail.com | (209) 329 9145 | Other | Lodi · San Joaquin County | — | — |
| Irrigation Resources INC | Michael Eugene Conrad | — | (209) 483 7775 | Other | Stockton · San Joaquin County | — | — |
| Isa Renovation INC | Chavez Joel Zepahua | — | (925) 278 8815 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Isd Construction | John Frederick Ilacqua | contact@isdconstruction.com | (866) 233 9112 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Isd Construction LLC | John Frederick Ilacqua | contact@isdconstruction.com | (619) 919 3503 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Izumi Construction | Joseph Dominic Izumi | — | (209) 808 5266 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Izzy's Grading Service INC | Ismael Jose Figueroa | — | (209) 823 0107 | Other | Manteca · San Joaquin County | — | — |
| J & B Construction | Khan Johnzeb | — | (209) 495 9874 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| J & C Door Experts INC | Junrey Gajilomo Erolon | service@jcdoorexperts.com | (209) 539 0533 | Other | Lathrop · San Joaquin County | — | — |
| J & E Builders | J & E Builders | — | (209) 366 4100 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| J & G Plumbing Services | Pedro Francine Rodriguez Barrios | info@jgplumbingservices.com | (209) 430 9184 | Other | Stockton · San Joaquin County | — | — |
| J & G Valley's Concrete INC | J Jesus Magana Cuevas | — | (209) 278 4930 | Other | Lathrop · San Joaquin County | — | — |
| J & J Petroleum Service | Jack Wayne Wiltz | — | (209) 481 5215 | Other | Stockton · San Joaquin County | — | — |
| J & J Quality Door INC | Jeffery Dean Cannon | — | (209) 948 5013 | Other | Stockton · San Joaquin County | — | — |
| J & J Superior Construction INC | Yi Li | — | (510) 918 0881 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J & L Gutter Company LLC | Jacob William Brown | — | (209) 641 2434 | Other | Stockton · San Joaquin County | — | — |
| J & M Greenview INC | Julian Miguel Pina Vigil | — | (209) 640 9635 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| J & N Flooring | J & N Flooring | — | (209) 373 6405 | Other | Stockton · San Joaquin County | — | — |
| J A Clark Construction INC | James Anthony Clark | info@jaclarkconstruction.com | (209) 825 9074 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| J A Gagnon Construction | Joseph Adam Gagnon | — | (408) 482 6267 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| J A S Telecom | J A S Telecom | — | (209) 601 8737 | Other | Tracy · San Joaquin County | — | — |
| J Alonso's Painting | J Alonso's Painting | — | (925) 567 7075 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| J B & B Construction INC | Jorge Barriga Barriga | — | (408) 595 5471 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| J B Remodeling Experts INC | Cuiriz Jb Bautista | info@jbremodelingexpertsinc.com | (408) 687 1420 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| J Bartholomew Construction | Timothy Bartholomew Buchanan | — | (925) 428 1438 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| J C Construction | Campa Jesus | — | (209) 404 8133 | GC, remodel, ADU | Ripon · San Joaquin County | — | — |
| J C Expressions Concrete | J C Expressions Concrete | — | (209) 612 9993 | Other | Tracy · San Joaquin County | — | — |
| J C Flooring | J C Flooring | — | (209) 390 3728 | Other | Stockton · San Joaquin County | — | — |
| J C Ott Investments INC DBA C N R Construction | Raymond Ross Ott | — | (209) 603 7340 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| J C Rego INC DBA J C Rego Refrigeration | John Carlos Rego | — | (209) 836 5353 | HVAC | Tracy · San Joaquin County | — | — |
| J Casillas Construction INC | Jorge Luis Casillas Soto | — | (925) 518 5496 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| J Corona Construction INC | Jose Baldomero Corona Rios | — | (209) 993 4261 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| J D Construction | Javier Tamayo Diaz | — | (209) 207 1105 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |