| All Valley Air Heating-air Conditioning | All Valley Air Heating-air Conditioning | — | (805) 522 8820 | HVAC | Simi Valley · Ventura County | — | — |
| All Valley Electric | Kevin Scott Santor | — | (805) 527 1008 | Electricians | Simi Valley · Ventura County | — | — |
| All Valley Home Improvement | All Valley Home Improvement | — | (805) 823 3505 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| All Wired Up Electrical Services INC | Nathaniel Ross Dilworth | — | (805) 717 7499 | Electricians | Westlake Village · Ventura County | — | — |
| Allan T Flaa | Allan T Flaa | — | (805) 312 5625 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Allbright Window Coverings | Allbright Window Coverings | anapbm@gmail.com | (818) 652 3101 | Other | Moorpark · Ventura County | — | — |
| Allegro Custom Floors | Allegro Custom Floors | — | (805) 558 4417 | Other | Simi Valley · Ventura County | — | — |
| Allen / Craig Electric | Craig Allen Spellman | — | (805) 527 3468 | Electricians | Simi Valley · Ventura County | — | — |
| Allen Construction INC | Karen Lee Scheneman | — | (818) 879 5334 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Allen Electric & Lighting INC | Gary James Seely | — | (661) 406 5240 | Electricians | Ventura · Ventura County | — | — |
| Allen Oleson Construction | Allen Parley Oleson | — | (805) 415 0879 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Allen Overhead Door LLC | Jacob Allen Wolverton | — | (805) 342 7767 | Other | Santa Paula · Ventura County | — | — |
| Alliance Fire Protection INC | Tyler Austin Williams | — | (805) 484 0511 | Other | Camarillo · Ventura County | — | — |
| Alliance Overhead Door | Alliance Overhead Door | — | (805) 432 0890 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Alliance Plumbing INC | Grady Puls | — | (805) 701 9981 | Other | Ventura · Ventura County | — | — |
| Alliance Roofing Specialist INC | Arturo Mendez Fernandez | — | (805) 216 1878 | Other roofers | Oxnard · Ventura County | — | — |
| Alliance Technology Solutions | Alliance Technology Solutions | — | (714) 981 4538 | Other | Simi Valley · Ventura County | — | — |
| Allied Plumbing - Mechanical | Ray Charles Scheinert | — | (805) 218 1913 | Other | Camarillo · Ventura County | — | — |
| Allied Universal® Security Services | Allied Universal® Security Services | — | (805) 983-1204 | Alarm and generators | Ventura · Ventura County | — | — |
| Allison Kunath Design | Allison Shae Kunath | — | (952) 484 3294 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Allpoint Communications | Justin Grant Huish | — | (805) 584 3757 | Other | Simi Valley · Ventura County | — | — |
| Allreal Painting INC | Alberto Rea | — | (805) 258 1390 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Allstar Garage Door INC | Ryan Michael Salinas | — | (888) 485 3667 | Other | Thousand Oaks · Ventura County | — | — |
| Alltime Painting LLC | Nicholas Maxwell Robinson | — | (805) 844 1314 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Almace Roofing | Adalberto Zamora Fernandez | — | (805) 485 0668 | Other roofers | Oxnard · Ventura County | — | — |
| Almighty Painting | Almighty Painting | — | (805) 949 6777 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Aloe Glass | Aloe Glass | aloeglassco@gmail.com | (818) 309 7153 | Windows, patio, painters | Westlake Village · Ventura County | — | — |
| Aloha Landscaping | Aloha Landscaping | — | (818) 297 9806 | Windows, patio, painters | Port Hueneme · Ventura County | — | — |
| Aloha Painting Co | Christopher Michael Witbeck | — | (805) 320 9317 | Windows, patio, painters | Camarillo · Ventura County | — | — |
| Aloha Pools & Spa | Aloha Pools & Spa | — | (805) 701-4550 | Pool | Ventura · Ventura County | — | — |
| Aloia Painting And Remodeling | Aloia Painting And Remodeling | — | (818) 640 5055 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Aloni Construction LLC | Doron Izhak Aloni | — | (818) 521 9989 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Alonso Construction Of So Cal INC | Edgar Saul Alonso | — | (818) 297 4920 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Alpha 23 Electric INC | Avner Charir | — | (323) 301 9603 | Electricians | Simi Valley · Ventura County | — | — |
| Alpha Builders Group INC | Chester John Jr Jagiello | — | (805) 701 4508 | GC, remodel, ADU | Ojai · Ventura County | — | — |
| Alpha Electrical Services INC | Juan Antonio Hernandez | interested@domainmarket.com | (323) 595 1268 | Electricians | Simi Valley · Ventura County | — | — |
| Alpha Sun Construction | Phillip Mark Macphail | — | (805) 889 7134 | Electricians | Ventura · Ventura County | — | — |
| Alpha Wildfire Reduction And Land Management | Christopher Luna | — | (805) 607 2076 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Alphaline Advantage INC | Matthew Czar Stottle | — | (805) 203 6385 | Other | Thousand Oaks · Ventura County | — | — |
| Alpine Gates Pros INC | Chaggai Moshe Zion | — | (805) 422 9345 | Other | Thousand Oaks · Ventura County | — | — |