| At Your Service Heating & Air Conditioning | Anthony Romo Lomeli | — | (805) 377 6564 | HVAC | Fillmore · Ventura County | — | — |
| Atencio Builders INC | Timothy Arthur Sr Atencio | info@atenciobuilders.com | (805) 813 5150 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Atiabi Construction Co | Atiabi Shahram | — | (818) 402 5222 | GC, remodel, ADU | Somis · Ventura County | — | — |
| Atl Tile & Stone | Atl Tile & Stone | — | (805) 236 3197 | Other | Oxnard · Ventura County | — | — |
| Atlantis Electrical | Robert Manuel Gomez | — | (818) 478 7727 | Electricians | Simi Valley · Ventura County | — | — |
| Atlantis Utility INC DBA Affordable Telecom | Jack Lynch Green | — | (805) 658 2379 | Other | Ventura · Ventura County | — | — |
| Atmak Construction | Troy James Bygrave | — | (818) 764 7992 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Atom Electric | Jose De Jesus Regalado Gonzalez | — | (805) 861 3082 | Electricians | Oxnard · Ventura County | — | — |
| Attentive Drywall | Attentive Drywall | — | (805) 253 5023 | Other | Oxnard · Ventura County | — | — |
| Attentive Plumbing | Attentive Plumbing | — | (805) 519 9198 | Other | Westlake Village · Ventura County | — | — |
| Audio Etc | Audio Etc | — | (805) 402 2399 | Other | Newbury Park · Ventura County | — | — |
| Audio Video Creations | Audio Video Creations | interested@domainmarket.com | (805) 207 4785 | Other | Simi Valley · Ventura County | — | — |
| Audio Video Experts | Audio Video Experts | — | (805) 797 3390 | Other | Ventura · Ventura County | — | — |
| Auggie Air | Auggie Air | services@auggieair.com | (818) 912 1694 | HVAC | Simi Valley · Ventura County | — | — |
| August Roofing Incorporated | Christopher August Dyck | — | (805) 394 2336 | Other roofers | Simi Valley · Ventura County | — | — |
| Aurea Construction INC | Israyelyan Jane | operations@aureaconstruction.com | (323) 809 3854 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| Aurora Power Services | Christopher Ole Munch | info@aurorapowerservices.com | (203) 979 9681 | Electricians | Westlake Village · Ventura County | — | — |
| Aussie Built Construction INC | Mark Stephen Callaghan | edward@aussiebuiltconstruction.com | (805) 432 9864 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| Austin Air Heating And Air Conditioning INC | Nicholas Austin Jackson | — | (805) 850 5426 | HVAC | Santa Paula · Ventura County | — | — |
| Austin Dillon Construction | Austin Jr Dillon | — | (805) 551 8770 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Austin's Painting | Stephen Russell Austin | — | (805) 642 3655 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Authentic Woodworks | Authentic Woodworks | — | (818) 767 1777 | Other | Simi Valley · Ventura County | — | — |
| Automatic Water Conditioning | Automatic Water Conditioning | — | (805) 647 4800 | Other | Ventura · Ventura County | — | — |
| Autumn Landscape Incnc | Calderon Calderon Rudi | — | (805) 420 8046 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Avance Concrete Sawing | Avance Concrete Sawing | — | (805) 223 4015 | Other | Port Hueneme · Ventura County | — | — |
| Avanti Pools INC | Bernard Lloyd Zimring | — | (818) 501 3759 | Pool | Westlake Village · Ventura County | — | — |
| Avd Plumbing | Avd Plumbing | — | (805) 279 1791 | Other | Simi Valley · Ventura County | — | — |
| Avila Construction INC | Carlos Prado Avila | — | (805) 760 0424 | GC, remodel, ADU | Port Hueneme · Ventura County | — | — |
| Avila's Elite Roofing INC | Jose Alfredo Avila | — | (805) 396 8886 | Other roofers | Oxnard · Ventura County | — | — |
| Avila's Home Improvement INC DBA Avila's Construction | David Alan Dwyer | — | (805) 587 7962 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Avilo Construction INC | John Anthony Ferrante | — | (805) 496 9255 | GC, remodel, ADU | Moorpark · Ventura County | — | — |
| Avl Construction LLC | Herrera Ramiro Avalos | — | (747) 230 0531 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Avs Landscaping INC | Ventura Santiago Antonio | — | (805) 905 9850 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| Awning Pro | Awning Pro | — | (805) 646 5124 | Other | Ojai · Ventura County | — | — |
| Axel Framing INC | Franklin Amilcar Aragon Gomez | — | (818) 823 7185 | Other | Simi Valley · Ventura County | — | — |
| Ayala And Son's Painting Plus | Ayala And Son's Painting Plus | — | (805) 526 0565 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Ayala Commercial Drywall INC | Ayala Abel | — | (805) 208 5761 | Other | Oxnard · Ventura County | — | — |
| Az Landscape | Az Landscape | — | (805) 620 8616 | Windows, patio, painters | Fillmore · Ventura County | — | — |
| Azar Construction & Design | Mohamed Levi Azar Garcia | — | (805) 415 6198 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Aztec Roofing INC | Gilbert Efren Esquivel | — | (805) 218 1747 | Other roofers | Oak View · Ventura County | — | — |