| Aquacheck Backflow Prevention Testing And Service | Jenette Marie Denning | — | (562) 697 8915 | Other | Brea · Orange County | — | — |
| Aquacut Fabricators LLC | Charles Joseph Ii Bauer | — | (949) 298 7055 | Other | Mission Viejo · Orange County | — | — |
| Aquadog Pool Care | Aquadog Pool Care | — | (949) 633 9909 | Pool | Mission Viejo · Orange County | — | — |
| Aquagreen Constructing | Wang Jie Wen | — | (858) 952 2207 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Aquakleen Authorized Service Corporation | Ricardo Alejandro Hernandez | — | (714) 258 8802 | Other | Costa Mesa · Orange County | — | — |
| Aqualife Ponds | David Thomas Misterly | — | (949) 244 8164 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Aqualine Pool Care INC | Kenneth Austin Shelton | — | (714) 800 9988 | Pool | Huntington Beach · Orange County | — | — |
| Aqualine Pool Service INC | Scott Thomas Kather | — | (714) 742 9597 | Pool | Rancho Santa Margarita · Orange County | — | — |
| Aquaphoenix Builders | Cronin Zohra | — | (714) 442 8389 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Aquapure Pools | Timothy Lane Rolfer | anapbm@gmail.com | (714) 960 6292 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Aquarium Painting Co | Jose Felix Mendez | — | (714) 390 5710 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| Aquarius Pool Service INC | David Ross Covina | — | (949) 547 4970 | Pool | Newport Beach · Orange County | — | — |
| Aquatectural Design INC | Charles Ho Yoo | — | (714) 521 5727 | GC, remodel, ADU | La Habra · Orange County | — | — |
| Aquaterra Homes INC | Renato Humberto Rivas | — | (949) 500 9739 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Aquaterra Landscape INC | Hengdong Li | — | (949) 386 6217 | Windows, patio, painters | Irvine · Orange County | — | — |
| Aquatic Balance INC | Jeffrey Charles Theders | — | (714) 435 9080 | Pool | Santa Ana · Orange County | — | — |
| Aquatic Service INC | Kenneth Dale Hart | — | (949) 493 4390 | Pool | San Juan Capistrano · Orange County | — | — |
| Aquatic Technologies | Kenneth Dale Hart | — | (949) 493 9548 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Ar Drywall & Taping | Jose Alfredo Flores Rodriguez | — | (818) 481 8973 | Other | Costa Mesa · Orange County | — | — |
| Ar Remodeling Services | Javier Andres Rodriguez | — | (949) 498 0900 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Ara Heating & Air Conditioning | Ara Heating & Air Conditioning | — | (949) 861 8848 | HVAC | Irvine · Orange County | — | — |
| Aragon Electrical Contractors | Andrew Kevin Aragon | — | (714) 813 7578 | Electricians | Buena Park · Orange County | — | — |
| Aragon's Tree Care | Aragon's Tree Care | — | (949) 891 3141 | Other | Laguna Hills · Orange County | — | — |
| Aragona Construction | Jeffery Scott Aragona | — | (949) 279 3311 | Other | San Clemente · Orange County | — | — |
| Ararco Electric INC | Abdulraheem Mohammad Mahamdeh | raheem@ararcoelectric.com | (562) 237 1288 | Electricians | Yorba Linda · Orange County | — | — |
| Aras/jr Framing INC | Banuelos Angel Ulloa | — | (714) 337 3054 | Other | Anaheim · Orange County | — | — |
| Araujo Design And Construction Group INC | Micaela Iraheta | — | (657) 221 0641 | GC, remodel, ADU | Orange · Orange County | — | — |
| Arbiso Restoration & Builders | Lawrence Jerome Iii Arbiso | — | (949) 439 2495 | GC, remodel, ADU | Ladera Ranch · Orange County | — | — |
| Arbor Expertise | Arbor Expertise | — | (714) 318 1209 | Windows, patio, painters | Orange · Orange County | — | — |
| Arc Construction And Design INC | Anthony Robert Carrieri | — | (949) 702 9680 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Arca | Jeremy Yvon Lepine | — | (424) 425 3838 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Arch Instruction Remodeling LLC | Shawn Preston Nguyen | — | (714) 335 9825 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Archer Plumbing INC | Roger William Jackson | — | (714) 537 5679 | Other | Garden Grove · Orange County | — | — |
| Archer's A / C | Archer's A / C | — | (949) 631 3862 | HVAC | Costa Mesa · Orange County | — | — |
| Archetype Cabinets | Archetype Cabinets | — | (949) 400 7271 | Other | Irvine · Orange County | — | — |
| Archie Ivy INC | Kurt Wilson Ivy | — | (714) 841 6227 | Other | Huntington Beach · Orange County | — | — |
| Archie's Plumbing & More | Archie's Plumbing & More | — | (714) 926 1722 | Other | La Palma · Orange County | — | — |
| Architectural Acoustics | Bartley Michael Moore | — | (714) 792 3624 | Other | Placentia · Orange County | — | — |
| Architectural Coatings INC | Therese Lynne Mase | — | (714) 701 1360 | Windows, patio, painters | Orange · Orange County | — | — |
| Architectural Design Contractors INC | Tory Wilson Stephen | — | (888) 774 5831 | GC, remodel, ADU | Santa Ana · Orange County | — | — |