| Joseph Antonioli Construction | Joseph Raymond Antonioli | — | (805) 443 5134 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Joseph Christman's West Coast Tree INC | Joseph Dennis Christman | — | (805) 479 9686 | Tree | Ventura · Ventura County | — | — |
| Joseph Heist Construction INC | Joseph James Heist | — | (818) 307 3335 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Joseph J Grinstead | Joseph J Grinstead | — | (805) 526 1294 | Electricians | Simi Valley · Ventura County | — | — |
| Joseph Mineo DBA Wallcovering By Scott Mineo | Wallcovering By Scott Mineo | — | (805) 498 2858 | Windows, patio, painters | Newbury Park · Ventura County | — | — |
| Joseph Moore | Joseph Moore | — | (805) 370 3253 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Joseph N Cortez | Joseph N Cortez | — | (805) 896 5067 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Joseph Rodriguez | Joseph Rodriguez | info@benetaschen.com | (917) 476-5437 | GC, remodel, ADU | Santa Paula · Ventura County | — | — |
| Joseph W Flanagan Electric | Joseph Woodrow Flanagan | — | (805) 331 5584 | Electricians | Camarillo · Ventura County | — | — |
| Joshua D Ganzhorn | Joshua D Ganzhorn | — | (510) 207 0801 | GC, remodel, ADU | Oak View · Ventura County | — | — |
| Joshua's Pool & Spa Service | Joshua James Barros | — | (805) 444 6696 | Pool | Oxnard · Ventura County | — | — |
| Jp Builder | Jp Builder | — | (805) 758 7378 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| Jpl Electric DBA Jpl Construction | John Pina Lopez | — | (805) 647 9994 | Electricians | Ventura · Ventura County | — | — |
| Jq Plumbing | Jq Plumbing | — | (805) 248 6510 | Other | Port Hueneme · Ventura County | — | — |
| Jr Ramirez Roofing INC | Cuevas Miguel Ramirez | jr.ramirezroofinginc@gmail.com | (805) 846 8907 | Other roofers | Oxnard · Ventura County | — | — |
| Jrh Electrical | Jami Reed Henderson | jrhelectricalllc@gmail.com | (716) 961-8395 | Electricians | Thousand Oaks · Ventura County | — | — |
| Jro Rooter & Plumbing | Jro Rooter & Plumbing | — | (805) 328 8934 | Other | Simi Valley · Ventura County | — | — |
| Jrxo Construction INC | Abel Ayala | — | (805) 208 5761 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Js Glass & Mirror INC | James Henry Stueve | aimee@qdjoysun.com | (818) 519 0639 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Js Plastering | Js Plastering | — | (805) 290 6364 | Other | Oxnard · Ventura County | — | — |
| Jsis Maintenance And Services | Adams Zachary | — | (805) 987 7747 | Other | Camarillo · Ventura County | — | — |
| Jsl Mastery Paving INC | Jesus Felix Limon | — | (805) 293 9251 | Other | Ventura · Ventura County | — | — |
| Jt Construction | Jeffrey Thomas Isaak | — | (805) 660 9574 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Jtap Construction INC | Tapia Juan | %20info@jtapconstruction.com | (805) 487 7121 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Juan Alcala Construction | Juan Manuel Alcala | — | (805) 844 4629 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Juan Baez Construction | Baez Juan | — | (805) 612 5081 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Juan D Chairez | Juan D Chairez | — | (805) 797 7965 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Juan M Marquez Alvarez De Toledo | Juan Martin Marquez Alvarez De Toledo | — | (805) 402 6037 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Juan P Cortez | Juan P Cortez | — | (805) 236 1820 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Julian's Tree Care | Julian's Tree Care | — | (805) 377 1561 | Tree | Oxnard · Ventura County | — | — |
| Julio Eckstein | Julio Eckstein | — | (213) 948 4146 | Electricians | Simi Valley · Ventura County | — | — |
| Julios Fine Cabinetry | Julios Fine Cabinetry | — | (805) 415 4757 | Other | Ventura · Ventura County | — | — |
| June Park | June Park | juneparkblog@gmail.com | (310) 367 8740 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Just Solutions Construction | Padilla Licea Javier | — | (805) 813 1498 | GC, remodel, ADU | Moorpark · Ventura County | — | — |
| Justin Denver Holt | Justin Denver Holt | — | (805) 522 3206 | Other | Simi Valley · Ventura County | — | — |
| Jv Electricity Services | Oscar Javier Juarez Alvarado | — | (805) 990 1188 | Electricians | Moorpark · Ventura County | — | — |
| Jv General Contractor INC | Juan Jose Valadez | — | (805) 368 8527 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Jw Glass | Jw Glass | — | (760) 716 8871 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Jw Home Care | Jw Home Care | — | (805) 443-3232 | Restoration | Oxnard · Ventura County | — | — |
| Jws Remodeling INC | Carlos Ovidio Santillana | — | (818) 397 5816 | Electricians | Simi Valley · Ventura County | — | — |