| Architectural Glass And Design | Daniel Thomas Gouvion | — | (714) 719 5681 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Architectural Window Shades | Andrew Kim Thompson | — | (916) 761 0489 | Other | Irvine · Orange County | — | — |
| Archon Concrete Construction | Thomas Todd Gee | — | (714) 968 4796 | Other | Huntington Beach · Orange County | — | — |
| Archspirit Design & Build | Dandan Cui | — | (946) 870 0115 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Archuleta Plumbing | Archuleta Plumbing | — | (310) 877 9328 | Other | Garden Grove · Orange County | — | — |
| Arciero & Sons INC | Frank John Jr Arciero | — | (949) 461 7030 | GC, remodel, ADU | Foothill Ranch · Orange County | — | — |
| Arcos B D Painting INC | Bertin Marcos Dominguez Reyes | — | (949) 836 4684 | Windows, patio, painters | Tustin · Orange County | — | — |
| Arcos Masonry | Hernandez Pedro Arcos | — | (714) 605 2514 | Other | Anaheim · Orange County | — | — |
| Arctic Airflow Mechanical | Arctic Airflow Mechanical | — | (714) 793 3773 | HVAC | Buena Park · Orange County | — | — |
| Ardenne Construction Corp | Sam Victor| Thong Sam Ath Thong | — | (310) 600 5560 | Electricians | Newport Beach · Orange County | — | — |
| Ardus Concrete INC | Duran Leobardo Arteaga | — | (714) 875 5910 | Other | Anaheim · Orange County | — | — |
| Area 12 Electric INC | Patrick Andree Birkner | — | (949) 231 8094 | Electricians | Westminster · Orange County | — | — |
| Area Coat Waterproofing INC | Harys Tomas Munoz Bido | — | (714) 499 1827 | Other | Fullerton · Orange County | — | — |
| Area Plumbing | Area Plumbing | — | (714) 865 9092 | Other | Anaheim · Orange County | — | — |
| Arellano's Roof Removal Services | Aranda Leonardo Arellano | arellanosroofremovalservises@gmail.com | (714) 860-6704 | Other roofers | Fullerton · Orange County | — | — |
| Arenas Painting INC | Paul Martin Arenas | — | (714) 527 5800 | Windows, patio, painters | Cypress · Orange County | — | — |
| Arete Ironworks | Guy Zakar Setian | — | (714) 767 7185 | Other | Irvine · Orange County | — | — |
| Argos Home Systems INC | Van Dyke James | — | (714) 894 9534 | Other | Garden Grove · Orange County | — | — |
| Ari Builders | Ari Builders | — | (714) 325 4944 | Electricians | Fullerton · Orange County | — | — |
| Ari Construction Group INC | Arash Salimi | — | (714) 866 8787 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Aria 4 Construction INC | Raed Subhi Abdalla Badwan | — | (949) 409 4073 | Electricians | Tustin · Orange County | — | — |
| Aria Building Construction INC | Ahoura Aria | — | (949) 439 3170 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Aria Elite INC | Fallah Maryam | — | (949) 415 4856 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Aria's Air Conditioning INC | Arias Jose Canchola | — | (714) 719 6648 | HVAC | Anaheim · Orange County | — | — |
| Arian Construction | Mozafari Nejad Arian | — | (310) 498 5633 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Arias Flooring Installation | Arias Flooring Installation | — | (714) 766 9038 | Other | Westminster · Orange County | — | — |
| Arias Flooring Solutions INC | Jason Alberto Arias | — | (714) 932 5635 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Ariel Gomez | Ariel Gomez | ariel@arielgomez.com | (714) 745 1430 | GC, remodel, ADU | Westminster · Orange County | — | — |
| Aris Painting INC | Aristarco Carreon | — | (562) 508 6968 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| Arise Electrical And Consulting | Harry Orson Jr Tooley | — | (951) 496 9566 | Electricians | Newport Beach · Orange County | — | — |
| Arix INC | Zarrinjoub Hassan | — | (949) 331 6245 | GC, remodel, ADU | Dove Canyon · Orange County | — | — |
| Ark Construction | Gonzalez David | — | (714) 319 1637 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Ark Electric INC | Julio Cesar Sanchez Ventura | — | (714) 467 0969 | Electricians | Santa Ana · Orange County | — | — |
| Ark Engineering Contractors INC | Fadi Mohammed Kerdiya | — | (714) 234 5679 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Ark Enterprises INC DBA Arc Electric | Randy Radu Cocan | — | (714) 803 1004 | Electricians | Anaheim Hills · Orange County | — | — |
| Arka Windows & Glass Doors | Andrey Gab | — | (949) 922 3747 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Arkinesis Jahn Nguyen | Arkinesis Jahn Nguyen | — | (714) 399 5489 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Arktech Construction | Ta-Wei Michael Lu | — | (626) 275 4368 | GC, remodel, ADU | Placentia · Orange County | — | — |
| Arm Construction & Development INC | Ahmadreza Mottahedan | — | (949) 339 4543 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Arm Home Design INC | Albert John Mendoza | — | (949) 215 5554 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |