| Artmn INC | Ruth Markarian | — | (714) 580 7288 | Other | Fountain Valley · Orange County | — | — |
| Arturo Espinosa DBA A J M Construction | Arturo Garcia Espinosa | — | (714) 903 6565 | Other | Stanton · Orange County | — | — |
| Arturo Guerrero | Arturo Guerrero | — | (949) 395 6773 | Other | Costa Mesa · Orange County | — | — |
| Artzaga's Tile & Stoneworks | Artzaga's Tile & Stoneworks | — | (714) 715 3600 | GC, remodel, ADU | Orange · Orange County | — | — |
| Arx Deco LLC | Hamidreza Heravi | hello@arxdeco.com | (818) 308-4433 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Arya Electric LLC | Mohammadi Abbas | info@aryaelectric.com | (424) 204 3037 | Electricians | Laguna Woods · Orange County | — | — |
| Arza Builders INC | Sergio Arturo Arzate Lemus | — | (714) 715 8017 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| As Built Construction | Alejandro Jesus Sanchez | — | (714) 702 0405 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| As Design Build | As Design Build | — | (617) 686 9219 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Asad Holdings LLC DBA Orangeblue General Contractors | Siavash Tehrani | — | (949) 317 5700 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| Asalone Enterprises INC DBA Paul Davis Restoration Of South | Betty Jo Asalone | — | (949) 455 1710 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Asap 24/7 Contractors | Claudia Antonia Coto | — | (949) 751 8069 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Asap HVAC | Asap HVAC | — | (714) 559 5964 | HVAC | Costa Mesa · Orange County | — | — |
| Asap Painting INC | Alvarado Rudy Oropeza | — | (714) 603 0272 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Asap Plumbing & Rooter | Asap Plumbing & Rooter | — | (714) 586 7396 | Other | Costa Mesa · Orange County | — | — |
| Asap Plumbing Services | Jamie Joseph Rubel | — | (714) 345 2094 | Other | Yorba Linda · Orange County | — | — |
| Asas Construction & Remodeling | Fawwaz Othmanshukri Sharabi | — | (657) 757 5053 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Asaz Construction | Sirwan Azizi | — | (818) 939 7625 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| Asbestos Removal INC DBA Sirris Abatement | Luis Ernesto Ochoa | — | (562) 401 1122 | Other | Stanton · Orange County | — | — |
| Ascend Construction INC | Villar Christian Del | — | (714) 381 5417 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| Ascension Termite Pest Control Construction INC | Robbie Anthony Van Lingen | — | (714) 785 3602 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Ase Painting Services INC | Jose Angel Ramirez Olivera | — | (714) 473 8985 | Windows, patio, painters | Tustin · Orange County | — | — |
| Asfc2 | Casey Andrew Karos | — | (714) 634 2324 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Ash Construction | Antonio Stephen Hernandez | ashconstructionservicesuk@gmail.com | (303) 356 2520 | GC, remodel, ADU | Brea · Orange County | — | — |
| Asha Construction | Ardeshir Jamshidi Kalantari | — | (949) 351 5332 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| Ashbrook & Associates | Nancy Lynn Ashbrook | — | (714) 441 1244 | Other | Fullerton · Orange County | — | — |
| Ashby's Window Coverings INC | Richard Jason Ashby | — | (949) 429 2575 | Other | Ladera Ranch · Orange County | — | — |
| Ashco Building Services INC | Francisco Andrade | — | (949) 330 0525 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Ashmore Construction Co | Harry Everett Ashmore | — | (714) 633 2795 | GC, remodel, ADU | Orange · Orange County | — | — |
| Asian Landscaping Service | Jason Wally| Shim Jae Woo Shim | — | (714) 390 6882 | Windows, patio, painters | Cypress · Orange County | — | — |
| Asl Electric | Stephane Chevrier | — | (949) 337 3177 | Electricians | Lake Forest · Orange County | — | — |
| Asl Plumbing Incorporated | John Fernando Cipres | — | (949) 337 3177 | Other | Lake Forest · Orange County | — | — |
| Aspen Technical Alarms INC | Emil Jan Pop | — | (714) 603 8946 | Other | Fountain Valley · Orange County | — | — |
| Asphalt Care INC | Shirley Carol Schaefer | — | (562) 220 2546 | Other | Huntington Beach · Orange County | — | — |
| Asphalt Mastery Co | Longinos Hector Martinez | — | (657) 684 9427 | Other | Orange · Orange County | — | — |
| Assembly Renovations INC | Andy Carrillo | — | (949) 204 7549 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Assi Security | Michael Gerard Willey | service@assisecurity.com | (949) 955 0244 | Electricians | Irvine · Orange County | — | — |
| Associated Construction Services INC | Greg Sarkissian | — | (949) 661 2274 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Associated Heating & Air INC | Dominic Anthony Ramos | — | (714) 777 8833 | HVAC | Anaheim · Orange County | — | — |
| Associated Telecom Services INC | Brad Edward Harris | — | (714) 919 2525 | Other | Orange · Orange County | — | — |