| A D K Construction INC | Stephen Glenn Adkison | — | (661) 212 4353 | GC, remodel, ADU | Port Hueneme · Ventura County | — | — |
| A E Roofing | Juan Carlos Escobedo | aeroofingsm@gmail.com | (805) 494 3186 | Other roofers | Thousand Oaks · Ventura County | — | — |
| A G D Cabinetry | A G D Cabinetry | — | (805) 680 3606 | Other | Ventura · Ventura County | — | — |
| A G Electricals | A G Electricals | — | (818) 261 2746 | Electricians | Simi Valley · Ventura County | — | — |
| A G Woodworks | A G Woodworks | — | (805) 512 1518 | Other | Camarillo · Ventura County | — | — |
| A Gomez Landscaping Designs | A Gomez Landscaping Designs | — | (805) 823 5068 | Windows, patio, painters | Simi Valley · Ventura County | — | — |
| A Grade Plumbing | Francisco Javier Hernandez | — | (805) 705 2864 | Other | Oxnard · Ventura County | — | — |
| A J F Electric | Allan James Frattali | — | (805) 493 1363 | Electricians | Thousand Oaks · Ventura County | — | — |
| A J Freid General Contractor | A J Freid General Contractor | — | (805) 807 5361 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| A K Electric | Andrew Mark Katsch | — | (805) 304 8456 | Electricians | Simi Valley · Ventura County | — | — |
| A L Construction | Arturo Ramirez Lopez | — | (805) 797 7422 | GC, remodel, ADU | Fillmore · Ventura County | — | — |
| A L M Electric LLC | James Andrew Lagarde | — | (805) 915 7609 | Electricians | Simi Valley · Ventura County | — | — |
| A M C Services | Erich Wootan Kreig | — | (805) 216 9145 | Other | Ventura · Ventura County | — | — |
| A M Concrete Incorporated | Kathleen A Mattivi | — | (818) 362 8300 | Other | Thousand Oaks · Ventura County | — | — |
| A M Contracting | Mozaffarian Arya | — | (805) 856 8569 | GC, remodel, ADU | Newbury Park · Ventura County | — | — |
| A M Foxx Plumbing | A M Foxx Plumbing | — | (805) 732 4115 | Other | Thousand Oaks · Ventura County | — | — |
| A M G Landscaping | A M G Landscaping | — | (805) 231 6358 | Windows, patio, painters | Thousand Oaks · Ventura County | — | — |
| A Morales Electric | Jorge Eduardo Morales Aguilar | — | (805) 906 0726 | Electricians | Moorpark · Ventura County | — | — |
| A Quality Plastering Co | Jeffrey Edward Cusworth | — | (805) 312 3055 | Other | Simi Valley · Ventura County | — | — |
| A R Construction | Armando Renteria | — | (805) 760 0324 | GC, remodel, ADU | Camarillo · Ventura County | — | — |
| A R I Restore INC | Neli Malenkovic | — | (818) 790 1500 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| A R Pipeline INC | Aaron Joe Ramirez | — | (805) 732 4437 | Other | Thousand Oaks · Ventura County | — | — |
| A S A P Painting | A S A P Painting | — | (805) 377 4898 | Windows, patio, painters | Ventura · Ventura County | — | — |
| A Same Day Testing Co | April Day Hoyle | — | (805) 639 0080 | Other | Camarillo · Ventura County | — | — |
| A Scott Birdsall Construction Co | Andrew Scott Birdsall | — | (805) 857 2746 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| A T Electric | Arthur John Tielman | — | (818) 674 1862 | Electricians | Simi Valley · Ventura County | — | — |
| A T M Construction | Timothy Michael Murphy | — | (805) 300 5776 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| A To Z Plumbing & Rooter | Mauricio R Garduno | — | (805) 760 4558 | Other | Santa Paula · Ventura County | — | — |
| A To Z Roof INC | James Scott Elliott | — | (818) 262 8637 | Other roofers | Simi Valley · Ventura County | — | — |
| A Torres Landscaping | A Torres Landscaping | — | (805) 665 8355 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| A Total Landscape Company INC | Douglas William Scholle | — | (805) 988 4727 | Windows, patio, painters | Somis · Ventura County | — | — |
| A W D Services INC | David Eugene Jr Sissum | — | (805) 647 7400 | Other | Oak View · Ventura County | — | — |
| A-1 Construction | John Edward Lindsay | — | (805) 525 6400 | GC, remodel, ADU | Santa Paula · Ventura County | — | — |
| A-1 Drywall | A-1 Drywall | — | (805) 340 9908 | Other | Ventura · Ventura County | — | — |
| A-1 Guarantee Roofing INC | Ray Curtis Rudy | — | (805) 407 8151 | Other roofers | Oxnard · Ventura County | — | — |
| A-1 Quality Fence | A-1 Quality Fence | — | (805) 208 6931 | Other | Ventura · Ventura County | — | — |
| A-bear Roofing | Matthew Richard Hebert | — | (805) 299 5616 | Other roofers | Ventura · Ventura County | — | — |
| A-team Garage Doors | A-team Garage Doors | — | (805) 404 1517 | Other | Oxnard · Ventura County | — | — |
| A/c Fire Protection Company | Julie Ann Schram | info@acfireprotection.com | (805) 658 6809 | Other | Ventura · Ventura County | — | — |
| A/c One INC | Orlando Antonio Lopez Cabrera | — | (310) 310 5972 | HVAC | Simi Valley · Ventura County | — | — |