| Alfa Construction Usa INC | Alfonso Fabian Gonzalez | — | (818) 554 0220 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Alfa Roofing | Alfaro Eduardo | — | (805) 758 0488 | Other roofers | Oxnard · Ventura County | — | — |
| Alfa Services INC DBA Ac911.com | Oze Strausman | — | (888) 692 2911 | HVAC | Moorpark · Ventura County | — | — |
| Alfonso Hernandez | Alfonso Hernandez | — | (818) 237 7947 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Alfredo Carrillo | Alfredo Carrillo | — | (661) 998 9946 | Other | Santa Paula · Ventura County | — | — |
| Alfredo Rivera Painting | Alfredo Rivera Painting | — | (805) 290 2585 | Windows, patio, painters | Ventura · Ventura County | — | — |
| All About Doors | All About Doors | — | (805) 794 7236 | Other | Ventura · Ventura County | — | — |
| All About Pools Service And Repair INC | Christopher Scott Ferguson | — | (805) 526 5006 | Pool | Simi Valley · Ventura County | — | — |
| All American Air Conditioning And Heating | William Thomas Hartin | — | (805) 652 2224 | HVAC | Ventura · Ventura County | — | — |
| All American Building Contractors | Zamani Said | — | (818) 515 1931 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| All American Construction | Raul Jr Ibarra | — | (805) 501 0474 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| All American Pool / Spa | All American Pool / Spa | allamericanpoolspa@yahoo.com | (805) 390 5333 | Pool | Simi Valley · Ventura County | — | — |
| All American Roofing INC | John Paul Jr Tescher | — | (805) 388 2121 | Other roofers | Oxnard · Ventura County | — | — |
| All California Fencing INC | Karen Andreasyan | allcaliforniafencing@yahoo.com | (805) 499 9911 | Other | Newbury Park · Ventura County | — | — |
| All Climate Roofing & Construction | Charles Tibor Petri | — | (805) 504 1042 | Other roofers | Camarillo · Ventura County | — | — |
| All Coast Construction | Michael Grosswendt | info@allcoastconstruction.com | (818) 865 8371 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| All Coast Painting | All Coast Painting | — | (805) 499 5499 | Windows, patio, painters | Newbury Park · Ventura County | — | — |
| All Construction INC | Dan Derwin Fortuna | — | (805) 583 2719 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| All County Air Conditioning & Heating INC | Hector Cortez Ortiz | — | (805) 433 5292 | HVAC | Ventura · Ventura County | — | — |
| All Elite Audio Video INC | Cesar Melena Martinez | — | (805) 673 2929 | Other | Oxnard · Ventura County | — | — |
| All In House Construction INC | Marco Anthony Venegas | — | (805) 630 1173 | HVAC | Fillmore · Ventura County | — | — |
| All Inclusive Home Inspection | All Inclusive Home Inspection | — | (818) 961-3342 | Inspectors | Woodland Hills · Ventura County | — | — |
| All Is Possible Construction INC | Emmanuel Hernandez | — | (818) 796 9201 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| All Land Construction INC | Hector Perez Navarrete | info@alllandconstruction.com | (805) 910 5699 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| All Landscaping INC | Cristobal Jimenez | — | (805) 402 5076 | Windows, patio, painters | Moorpark · Ventura County | — | — |
| All Plaster Systems | All Plaster Systems | — | (805) 864 4018 | Other | Simi Valley · Ventura County | — | — |
| All Pro Construction | Saul Isaac Hernandez | — | (805) 832 5056 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| All Pro Finish Millwork And Cabinets | Ramirez Alejandro Lara | — | (805) 366 7225 | Other | Oxnard · Ventura County | — | — |
| All Pro Plumbing | All Pro Plumbing | — | (805) 200 9482 | Other | Camarillo · Ventura County | — | — |
| All Pro Pool & Spa | All Pro Pool & Spa | — | (805) 498 4888 | Pool | Westlake Village · Ventura County | — | — |
| All Purpose Plumbing And Rooter LLC | Montejano Alfredo | — | (805) 816 9525 | Other | Oxnard · Ventura County | — | — |
| All Roof & Window Systems | All Roof & Window Systems | — | (805) 582 1887 | Other roofers | Simi Valley · Ventura County | — | — |
| All Season Fencing | All Season Fencing | sethbonilla00@gmail.com | (805) 407 2237 | Other | Port Hueneme · Ventura County | — | — |
| All Seasons Painting Company | Michael Francis Leverette | interested@domainmarket.com | (818) 521 3734 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| All Seasons Pool Care | All Seasons Pool Care | — | (805) 570 4968 | Pool | Oxnard · Ventura County | — | — |
| All Service Maintenance | Gilbert Daniel Salas | — | (805) 732 4125 | Electricians | Thousand Oaks · Ventura County | — | — |
| All Star Roofing Ca | Juan Daniel Mendez | — | (805) 258 1960 | Other roofers | Ventura · Ventura County | — | — |
| All Surface Construction Incorporated | Ronald Lin Upmeyer | — | (805) 582 0221 | Other | Simi Valley · Ventura County | — | — |
| All Tile & Stone Service | Chad Alan Evans | — | (805) 496 6574 | Other | Moorpark · Ventura County | — | — |
| All Toasty_heating & AC | All Toasty_heating & AC | — | (805) 482 3457 | HVAC | Camarillo · Ventura County | — | — |