| Kool Dynamics Air Conditioning & Heating INC | Jose Juan Cornejo | — | (805) 236 0628 | HVAC | Oxnard · Ventura County | — | — |
| Koolco Mechanical INC | Georgios Nikolas Ioannidis | — | (805) 604 0309 | HVAC | Oxnard · Ventura County | — | — |
| Kostylov Electric | Kostylov Vitaliy | — | (310) 745 2985 | Electricians | Camarillo · Ventura County | — | — |
| Kott Marina Construction INC | David Stanley Kott | — | (805) 984 2567 | Other | Oxnard · Ventura County | — | — |
| Kourosh Design INC | Foumani Maskan Kevin Ansary | — | (818) 621 1134 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Kova Construction | Daniel Aguilar | — | (805) 216 7840 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Kp Electric | Paul Ronald Larmour | — | (805) 231 2594 | Electricians | Thousand Oaks · Ventura County | — | — |
| Kraken Construction | Robert Joseph Mara | info@krakenconstruction.com | (805) 908 7599 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Ksb Electric INC | Kenny Sullivan Berry | ksbelectric1@gmail.com | (410) 900-6457 | Electricians | Thousand Oaks · Ventura County | — | — |
| Kse Electric | Kirk Edward Saavedra | — | (805) 203 3752 | Electricians | Newbury Park · Ventura County | — | — |
| Kt Security Services | Kt Security Services | info@ktsecurityservices.com | (805) 218-6729 | Alarm and generators | Ventura · Ventura County | — | — |
| Kts Custom Builders LLC | Dilan Salvador Tejeda Cruz | — | (805) 616 7797 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Kuehnel Plumbing LLC | Trevor Paul Kuehnel | — | (805) 791 1244 | Other | Simi Valley · Ventura County | — | — |
| Kunal Dewan | Kunal Dewan | kunalx011@gmail.com | (805) 521 6676 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Kurf Electric | William Thomas Kurfess | — | (805) 405 2468 | Electricians | Newbury Park · Ventura County | — | — |
| Kurz Electric | Cody Joseph Kurz | — | (805) 816 8603 | Electricians | Oxnard · Ventura County | — | — |
| Kyle Benezra | Kyle Benezra | — | (805) 728 0085 | Other | Ventura · Ventura County | — | — |
| Kyle Davis Air Conditioning And Heating INC | Kyle Lee Davis | — | (805) 490 5594 | HVAC | Newbury Park · Ventura County | — | — |
| Kyle E Svenson | Kyle E Svenson | — | (937) 243 4155 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Kyle Hancock DBA Dirt Pour Da Vinci General Engineering | Kyle Dean Hancock | — | (805) 707 3811 | Other | Ojai · Ventura County | — | — |
| Kyle Parkinson | Kyle Parkinson | kyle.parkinson@gmail.com | (818) 614 8869 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Kyle Williams | Kyle Williams | — | (818) 590 5808 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Kyrill A Johnson Construction | Kyrill Alfred Hugo Johnson | — | (805) 404 7733 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| L & B Quality Tile INC | Luis Alberto Mendoza Ayala | — | (805) 236 4132 | Other | Ventura · Ventura County | — | — |
| L & H Consulting INC | Dell Lee Muntzel | mail@lhconsulting.com | (805) 647 5775 | Other | Ventura · Ventura County | — | — |
| L & J Construction | Luis Alberto Ramirez | — | (805) 889 0361 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| L & L Construction Technologies INC | William Joseph Ledferd | — | (805) 443 1439 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| L & L Woodworks | L & L Woodworks | — | (805) 432 8733 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| L & S Landscape - A Partnership | Jose Francisco Serna | — | (805) 207 7710 | Windows, patio, painters | Fillmore · Ventura County | — | — |
| L & S Plumbing | Liam John Hinde | — | (805) 368 6203 | Other | Newbury Park · Ventura County | — | — |
| L A Drill | James Kurt Mellinger | james@ladrill.com | (805) 526 7455 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| L A Foundation | James Kurt Mellinger | — | (805) 526 7455 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| L A Lath And Plaster INC | Beverly Jane Kemp | — | (818) 773 7575 | Other | Ventura · Ventura County | — | — |
| L B C C INC | Stephen Richard Brown | — | (818) 802 9270 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| L C Glass & Mirrors | Luis Ernesto Castro Burgos | — | (818) 916 0881 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| L D Construction | Lawrence Lynn Davis | info@ldconstruction.com | (805) 701 6785 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| L D M S Construction INC | Ryley Marie Liston | — | (818) 991 7148 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| L E C Construction INC | Lugasi Eli | — | (818) 744 3304 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| L E Construction General Building Contractor INC | Jose Luis Esparza | — | (805) 921 0405 | GC, remodel, ADU | Santa Paula · Ventura County | — | — |
| L L G Painting INC | Luis Gutierrez | — | (805) 933 1005 | Windows, patio, painters | Santa Paula · Ventura County | — | — |