| Ideal Concrete Worx | Ideal Concrete Worx | — | (805) 797 8408 | Other | Camarillo · Ventura County | — | — |
| Ideal Construction INC | Farid Hentabli | — | (818) 415 3857 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Ideal Homes & Development INC | Darly Severns | — | (805) 402 2404 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Ideal Security And Technology | Ideal Security And Technology | — | (805) 676-0278 | Alarm and generators | Ventura · Ventura County | — | — |
| Idri Restoration INC | Keir Gian Milan | keir@idrirestoration.com | (818) 564 5615 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Iglesias Painting INC | Jimenez Hugo Chijate | — | (805) 285 6203 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| Ihernandez Finish Carpentry INC | Munoz Israel Hernandez | — | (805) 407 3948 | Other | Oxnard · Ventura County | — | — |
| Ihp Plumbing INC | Ivan Humberto Prieto | — | (805) 297 6942 | Other | Thousand Oaks · Ventura County | — | — |
| Ijdesign & Build | William Herbert Davis | — | (805) 279 0224 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Ike's Pump & Drilling INC | Nancy Marie Edie Shari | — | (805) 485 3912 | Other | Oxnard · Ventura County | — | — |
| Ikyb HVAC Services INC | Igor Boubel | ikybhvacservices@gmail.com | (818) 299-1800 | HVAC | Simi Valley · Ventura County | — | — |
| Image Hardwood Floors | Image Hardwood Floors | — | (310) 864 9832 | Other | Thousand Oaks · Ventura County | — | — |
| Imagine That Painting And Decorating | Imagine That Painting And Decorating | — | (310) 874 9375 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Imagineer Remodeling Corp | Yoni Cohen | — | (805) 371 7488 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Imperial Crown Electric | Maria Elena Ortiz | — | (805) 696 8139 | Electricians | Ventura · Ventura County | — | — |
| Import Plumbing INC | Timothy George Port | — | (805) 206 8943 | Other | Thousand Oaks · Ventura County | — | — |
| Imrie Construction LLC | Brad Douglas Imrie | — | (802) 603 2610 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| In - Line Sheet Metal INC A California Corporation | Kristin Janelle Maksic | — | (805) 376 2227 | Other | Newbury Park · Ventura County | — | — |
| In Facilities INC | Kendall Edward Smith | — | (805) 857 3719 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| In Home Safely Home Remodeling | Graeme Barry Cohen | — | (323) 864 2089 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| Independent Concrete Cutting INC | Michael Bruce Sr Kirkendall | — | (805) 988 0016 | Other | Oxnard · Ventura County | — | — |
| Independent Pipeline Inspection Service INC | Juan Javier Silva | — | (909) 262 6133 | Other | Camarillo · Ventura County | — | — |
| Independent Roofing INC | Oscar Espino | — | (805) 701 9617 | Other roofers | Camarillo · Ventura County | — | — |
| Indoor Comfort Solutions | Indoor Comfort Solutions | interested@domainmarket.com | (805) 297 5503 | HVAC | Simi Valley · Ventura County | — | — |
| Industrial Boiler Service INC | Danny Lane Withrow | — | (805) 570 7055 | HVAC | Ojai · Ventura County | — | — |
| Infinity Electric | Jordan David Schmidt | — | (805) 650 9054 | Electricians | Ventura · Ventura County | — | — |
| Infinity Roofers INC | Pedro Reyes | infinityroofersinc@gmail.com | (323) 617 0468 | Other roofers | Simi Valley · Ventura County | — | — |
| Inflow Window LLC | Nathan Alexander Ramos | — | (805) 288 2226 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Innerspace Interiors Flooring | Ali Sahraie Afshari | — | (818) 631 9102 | Other | Thousand Oaks · Ventura County | — | — |
| Innocenti Construction INC | Albert William Innocenti | — | (805) 386 3129 | Other | Camarillo · Ventura County | — | — |
| Innovative Building Contractors | Edmundo Jr Elenes | — | (805) 832 1963 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Innovative Electrical Designs | Zanley Jay Timm | — | (805) 857 3275 | Electricians | Camarillo · Ventura County | — | — |
| Innovative Vision Co | Camarena Ismael Maceda | — | (805) 317 1609 | Windows, patio, painters | Ojai · Ventura County | — | — |
| Inspectpros Inc. | Inspectpros Inc. | — | (805) 484-9711 | Inspectors | Camarillo · Ventura County | — | — |
| Inspiration Garden Landscape INC | Ortiz Jose Ayala | — | (805) 908 8782 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Instant Lawn | Instant Lawn | dave@lab6.com | (805) 750 6887 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Instrument Control Services | Michael James Le Blanc | — | (805) 642 1999 | Electricians | Ventura · Ventura County | — | — |
| Integral Design INC | Walter Kurt Philipp | — | (805) 340 2256 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Integrated Fire & Safety | Theron Leroy Merrell | ifs@integratedfiresafety.com | (805) 648 5906 | Electricians | Ventura · Ventura County | — | — |
| Integrity Comfort Systems | Kenneth Joseph Dallas | — | (805) 842 9391 | HVAC | Simi Valley · Ventura County | — | — |