| J K S Construction Backhoe Service | Kirk Wayne Hyatt | — | (805) 207 5489 | Other | Ojai · Ventura County | — | — |
| J L Construction | James Michael Lee | — | (805) 469 3357 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| J L Designs | J L Designs | — | (805) 750 0853 | Other | Simi Valley · Ventura County | — | — |
| J L Electric | Vincent Lawrence Olivera | — | (805) 483 5645 | Electricians | Oxnard · Ventura County | — | — |
| J L M Building Improvement | J L M Building Improvement | — | (805) 302 1158 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| J L Marine Construction | Jack Iii Lemaire | — | (805) 302 6802 | Other | Ventura · Ventura County | — | — |
| J Larson Tile | J Larson Tile | — | (805) 798 7020 | Other | Ojai · Ventura County | — | — |
| J M A Construction | John Mike Azar | — | (805) 499 9910 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| J M A Construction Company | Michael Allen Jones | — | (805) 207 5188 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| J M B Services INC DBA Pacific Landscape Services | James Michael Baron | — | (805) 732 0260 | Windows, patio, painters | Somis · Ventura County | — | — |
| J M Gerber Construction | John Michael Gerber | — | (805) 231 7194 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| J M J Builders | James Alan Onstot | — | (805) 290 7529 | GC, remodel, ADU | Santa Paula · Ventura County | — | — |
| J M Johnston Construction | John Mc Coy Johnston | — | (805) 794 8222 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| J M L Heating-cooling | J M L Heating-cooling | — | (805) 640 1163 | HVAC | Ojai · Ventura County | — | — |
| J M Plumbing INC | Justin Joseph Morgan | — | (818) 426 7944 | Other | Thousand Oaks · Ventura County | — | — |
| J M R Landscape Design INC | Juan Martin Rangel | — | (805) 822 7899 | Windows, patio, painters | Somis · Ventura County | — | — |
| J M S Pool & Spa Service | Jason Michael Shaffer | — | (805) 620 8181 | Pool | Newbury Park · Ventura County | — | — |
| J M W Constructors INC | John Michael Wilgus | — | (805) 499 4974 | Other | Newbury Park · Ventura County | — | — |
| J Michael Mcmullen General Construction | James Michael Mc Mullen | — | (805) 732 4763 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| J N Electric | Negrete Jesus | — | (805) 317 5537 | Electricians | Fillmore · Ventura County | — | — |
| J O Roofing | Szaldobagyi Jozsef | — | (818) 345 9471 | Other roofers | Thousand Oaks · Ventura County | — | — |
| J Ortiz Painting | J Ortiz Painting | info@jortizpainting.com | (805) 815 1803 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| J P C Construction | Joseph P Callaghan | — | (818) 906 0330 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| J R Construction | Juan Luis Rodriquez | — | (805) 448 9881 | Other | Ojai · Ventura County | — | — |
| J R Construction Company | Jose Estrada Ramirez | — | (805) 526 3684 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| J R H Group INC | Jeffrey William Hanes | — | (805) 496 3486 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| J R P Design & Remodel INC | Justin Jon Pecikonis | — | (805) 446 6500 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| J R Roofing Company | Rodriguez Jorge | — | (805) 503 0656 | Other roofers | Oxnard · Ventura County | — | — |
| J S B Construction | James Scott Barmasse | — | (805) 208 9938 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| J S Baker Plumbing & Rooter | James Scott Baker | — | (805) 889 3126 | Other | Simi Valley · Ventura County | — | — |
| J S Construction | John Steven Clause | — | (805) 570 9130 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| J S Hamilton INC | John Shelby Jr Hamilton | — | (818) 435 6200 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| J S Innovative Systems INC | Adams Zachary | — | (818) 987 7747 | Other | Camarillo · Ventura County | — | — |
| J S M Drywall | J S M Drywall | — | (805) 487 9669 | Other | Oxnard · Ventura County | — | — |
| J T B Design & Construction Corporation | James Taylor Iii Blake | — | (818) 679 3511 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| J Vega Engineering INC | Juan Ayala Vega | — | (805) 479 6563 | Other | Oxnard · Ventura County | — | — |
| J W Construction | Jonathan Clark Wilburn | — | (818) 963 2949 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| J W Enterprises | Robin Lynn Wachsman | info@jwenterprises.com | (805) 658 2449 | Electricians | Ventura · Ventura County | — | — |
| J W Facility Services And Construction INC | Jared Stephen Wilkinson | — | (805) 218 7921 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| J W Lane Drywall Services | Jeffery Weldon Lane | — | (805) 732 4523 | Other | Camarillo · Ventura County | — | — |