| Ace Landscaping | Jose Antonio Arredondo | info@ace-landscaping.com | (647) 617-4020 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| Ace Plumbing | Ace Plumbing | info@aceplumbing.com | (916) 455-4548 | Other | Ventura · Ventura County | — | — |
| Acme Heating & Air Conditioning Company | Adam Wilson Neely | — | (805) 446 3091 | HVAC | Thousand Oaks · Ventura County | — | — |
| Acore - Amacs | Gabriel Edward Gomez | — | (805) 833 8011 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Acorn Refacing Company | Thomas James Hannon | tomh@acornrefacing.com | (805) 659 1930 | Other | Ventura · Ventura County | — | — |
| Acosta Heating And Air Conditioning INC | Jesse Iii Acosta | — | (805) 498 3939 | HVAC | Newbury Park · Ventura County | — | — |
| Acosta Lath And Plaster INC | Joshua Alan Acosta | — | (805) 774 6136 | Other | Santa Paula · Ventura County | — | — |
| Acosta Plastering INC | Alan Ray Acosta | — | (805) 815 2757 | Other | Santa Paula · Ventura County | — | — |
| Acoustical Concrete Floor Systems INC | Bruce Alan Batelaan | — | (805) 351 5273 | Other | Camarillo · Ventura County | — | — |
| Acp Construction INC | Andrew Charles Paiva | — | (805) 791 0285 | GC, remodel, ADU | Moorpark · Ventura County | — | — |
| Acqua Coolers | Chad Joseph Kominek | info@acquacoolers.com | (805) 388 0118 | Other | Camarillo · Ventura County | — | — |
| Acres Home Repairs | Acres Home Repairs | — | (805) 253 8428 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Action Brothers Concrete Pumping | Erick Noel Nunez | — | (805) 901 7867 | Other | Ventura · Ventura County | — | — |
| Action Construction Services | Marius Lance Antaky | — | (805) 258 6760 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Action Fire Protection | Action Fire Protection | — | (805) 639 0255 | Other | Camarillo · Ventura County | — | — |
| Action General Construction Services | David Ray Benyshek | — | (818) 266 0950 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Action Key Safe And Locksmiths | Action Key Safe And Locksmiths | — | (805) 414 5898 | Other | Channel Islands · Ventura County | — | — |
| Active Garage Door Services | Abdel Maher Ismail | — | (805) 279 9677 | Other | Moorpark · Ventura County | — | — |
| Active Leak Detection & Plumbing LLC | Cortez Hugo | — | (805) 656 3999 | Other | Oxnard · Ventura County | — | — |
| Ada Compliance Masters | Ada Compliance Masters | john@ada-cm.com | (818) 470 4344 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| Ada General Eng INC | Arthur Anthony Jr Apodaca | — | (805) 807 9882 | Other | Oxnard · Ventura County | — | — |
| Ada Roofing INC | Aureliano Jr Flores | — | (805) 317 1215 | Other roofers | Oxnard · Ventura County | — | — |
| Adam Hellenbrand Construction | Adam March Hellenbrand | — | (805) 798 4276 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Adam Hillis Grading | Adam Hillis Grading | — | (805) 404 2542 | Other | Simi Valley · Ventura County | — | — |
| Adam Warren DBA Gateshead Bay Construction | Adam Michael Warren | — | (805) 248 2892 | GC, remodel, ADU | Ventura · Ventura County | — | — |
| Adg Builders INC | Chris Sunghyon Shin | — | (808) 444 2641 | GC, remodel, ADU | Oxnard · Ventura County | — | — |
| Adg Landscapes INC | Alan Danilo Garcia | — | (323) 316 6641 | Windows, patio, painters | Ventura · Ventura County | — | — |
| Adler Remodeling INC | Adler Noam | info@adlerremodeling.com | (805) 232 5080 | GC, remodel, ADU | Westlake Village · Ventura County | — | — |
| Adobe Building Corp | Lopez Sergio Martinez | adobe@adobebuilding.com | (805) 290 8030 | GC, remodel, ADU | Fillmore · Ventura County | — | — |
| Adobe Construction | Rodriguez Daniel | info@adobeconstruction.com | (805) 732 0575 | GC, remodel, ADU | Moorpark · Ventura County | — | — |
| Adolf Wilburg Painting | Adolf Wilburg Painting | — | (805) 529 7784 | Windows, patio, painters | Moorpark · Ventura County | — | — |
| Adolfo Refrigeration | Adolfo Refrigeration | — | (805) 797 3296 | HVAC | Oxnard · Ventura County | — | — |
| Adrian Ayala Electric | Ayala Adrian | — | (805) 248 6716 | Electricians | Oxnard · Ventura County | — | — |
| Adrian Cortez Mendez | Adrian Cortez Mendez | — | (805) 470 8438 | Other | Ventura · Ventura County | — | — |
| Adt Security Services | Adt Security Services | — | (800) 743-4888 | Alarm and generators | Ventura · Ventura County | — | — |
| Advance Drain Solutions INC | Fernando Galicia | — | (805) 232 3735 | Other | Ventura · Ventura County | — | — |
| Advanced Air Systems | Advanced Air Systems | — | (818) 577 5195 | HVAC | Simi Valley · Ventura County | — | — |
| Advanced Aire Flow INC | Rolando Gabriel Juarez | — | (805) 760 4840 | HVAC | Fillmore · Ventura County | — | — |
| Advanced Audio & Video | Advanced Audio & Video | interested@domainmarket.com | (805) 455 0418 | Other | Ventura · Ventura County | — | — |
| Advanced Construction Services | Nicholas David Fitzsimmons | — | (805) 279 0729 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |