| Action 1 Handyman | Action 1 Handyman | — | (661) 319 4803 | GC, remodel, ADU | Saugus · Los Angeles County | — | — |
| Action Cleanup Environmental Services INC | Arsenio Hernandez | — | (800) 230 0810 | Other | Carson · Los Angeles County | — | — |
| Action Construction Group INC | Kevin Karen Kachaturian | — | (830) 302 8315 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| Action Contractors INC | Patricia Anne Moreau | — | (310) 505 6380 | Electricians | Torrance · Los Angeles County | — | — |
| Action Door Repair Corporation | Joseph Anthony Dejaifre | — | (323) 583 1026 | Other | Huntington Park · Los Angeles County | — | — |
| Action Duct Cleaning Company INC | Christopher Trejo | — | (626) 791 7870 | HVAC | Altadena · Los Angeles County | — | — |
| Action General Construction INC | Sergio Leonardo Mendez | — | (818) 573 3263 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| Action Hauling INC | Cruz Wendy | info@actionhauling.com | (818) 361 7200 | Other roofers | Sherman Oaks · Los Angeles County | — | — |
| Action Heating & Air Conditioning INC | Kevin Corbett Watson | — | (805) 217 0001 | HVAC | Sunland · Los Angeles County | — | — |
| Action Paging Corporation | Gregg Edward Daum | — | (562) 320 3400 | Other | Santa Fe Springs · Los Angeles County | — | — |
| Action Paint INC | Gannon John | — | (562) 618 7242 | Windows, patio, painters | Whittier · Los Angeles County | — | — |
| Action Plumbing | Action Plumbing | — | (310) 830 9382 | Other | Carson · Los Angeles County | — | — |
| Action Property Management | Action Property Management | — | (949) 450-0202 | Property managers | Los Angeles · Los Angeles County | — | — |
| Action Restoration Corporation | Louis John Sr Villa | — | (562) 201 6332 | GC, remodel, ADU | Whittier · Los Angeles County | — | — |
| Action Roofing INC | Robert Fay Jr Osborn | — | (310) 326 5678 | Other roofers | Torrance · Los Angeles County | — | — |
| Action Services | Roberta Mary Ivens | — | (562) 430 2800 | GC, remodel, ADU | Long Beach · Los Angeles County | — | — |
| Active Air Specialists INC | Jeremy Stephen Villegas | — | (661) 674 6946 | HVAC | Littlerock · Los Angeles County | — | — |
| Active Air Systems INC | Douglas John Frank | — | (661) 857 0000 | HVAC | Santa Clarita · Los Angeles County | — | — |
| Active Builders & Remodeling | Active Builders & Remodeling | — | (323) 632 3568 | GC, remodel, ADU | Carson · Los Angeles County | — | — |
| Active Construction INC | Erika Veronica Aguilar Ortiz | — | (562) 200 4437 | Electricians | Bellflower · Los Angeles County | — | — |
| Active Elevator INC | Dennis Demarco | — | (818) 701 7213 | Other | Chatsworth · Los Angeles County | — | — |
| Active Glass Co | Stephen Robert Santillan | — | (323) 890 8166 | Windows, patio, painters | Azusa · Los Angeles County | — | — |
| Active Home Construction INC | Hakop Telalian | — | (747) 888 1551 | GC, remodel, ADU | Panorama City · Los Angeles County | — | — |
| Active Roofing INC | Ivan De Jesus Ramirez | info@active-roofing.com | (310) 408 4940 | Other roofers | Wilmington · Los Angeles County | — | — |
| Active Rooter And Plumber INC | Harutyun Sargisovich Torosyan | — | (818) 930 0300 | Other | Granada Hills · Los Angeles County | — | — |
| Active Sandblasting Company | Steven Scott Wilson | — | (626) 287 0749 | Other | San Gabriel · Los Angeles County | — | — |
| Active Telecommunications Group INC | Colonel Hal Joseph Garcia | — | (909) 541 5852 | Other | Claremont · Los Angeles County | — | — |
| Activia Electric | Tade Aghakian | — | (818) 220 2287 | Electricians | Burbank · Los Angeles County | — | — |
| Acton Electric | Lorin Richard Jundy | — | (661) 212 2640 | Electricians | Acton · Los Angeles County | — | — |
| Actual Roofing Co | Francisco Javier Loya | — | (818) 365 1777 | Other roofers | Panorama City · Los Angeles County | — | — |
| Acudura Builders | Acudura Builders | — | (310) 420 7619 | GC, remodel, ADU | Redondo Beach · Los Angeles County | — | — |
| Acufab Structural | Salvador Lee Almanza | — | (310) 538 4944 | Other | Gardena · Los Angeles County | — | — |
| Acuna | Acuna Lance | — | (213) 293 5088 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Acuna Construction | Lizzeth Alejandra Acuna | — | (909) 670 4509 | GC, remodel, ADU | Pomona · Los Angeles County | — | — |
| Acuna Corp | Madison Ann Terry | — | (714) 701 9616 | GC, remodel, ADU | Whittier · Los Angeles County | — | — |
| Acuna Drywall | Acuna Drywall | — | (661) 609 6186 | Other | Lancaster · Los Angeles County | — | — |
| Acuna Painting Co | Alejandro Acuna | — | (909) 489 2489 | Windows, patio, painters | Pomona · Los Angeles County | — | — |
| Acuna's Plumbing & Rooter Service | Ismael Dereza Acuna | — | (818) 566 1323 | Other | Burbank · Los Angeles County | — | — |
| Acurraalloy INC | Gutierrez Christian | — | (562) 567 1039 | Other | Santa Fe Springs · Los Angeles County | — | — |
| Ad Builders | Bigdeli Mani | — | (310) 488 8478 | GC, remodel, ADU | Van Nuys · Los Angeles County | — | — |