| Ace Raingutters | Ace Raingutters | — | (818) 257 4766 | Other | Sylmar · Los Angeles County | — | — |
| Ace Refinishing INC DBA Synthetic Products | Thomas Patrick Syms | — | (818) 636 3726 | Other | Leona Valley · Los Angeles County | — | — |
| Ace Remodeling | Ace Remodeling | — | (313) 946 4500 | GC, remodel, ADU | Canoga Park · Los Angeles County | — | — |
| Ace Renovators & Retrofitting INC | Alionso Rodrigo Angel | — | (818) 471 5440 | GC, remodel, ADU | Sun Valley · Los Angeles County | — | — |
| Ace Rodil Heating And Air Conditioning | Arsenio B Rodil | — | (909) 996 1474 | HVAC | Diamond Bar · Los Angeles County | — | — |
| Ace Roofing Company | Adam Craig Webb | — | (818) 209 1533 | Other roofers | Glendale · Los Angeles County | — | — |
| Ace Roofing System Co | Austin Chang Han | — | (714) 900 0544 | Other roofers | La Mirada · Los Angeles County | — | — |
| Ace Roofing Systems | Jose De Jesus Olmedo | — | (310) 834 3900 | Other roofers | Torrance · Los Angeles County | — | — |
| Ace Sandblasting Corp | Amnon Simantov | — | (323) 245 2112 | Other | Glendale · Los Angeles County | — | — |
| Ace Sevier Painting | Ace Sevier Painting | — | (909) 624 5080 | Windows, patio, painters | Claremont · Los Angeles County | — | — |
| Ace Sign And Design | Ace Sign And Design | — | (323) 732 1489 | Other | Los Angeles · Los Angeles County | — | — |
| Ace Stairways & Construction | Mario Christian Castro | — | (213) 709 6266 | GC, remodel, ADU | Huntington Park · Los Angeles County | — | — |
| Ace Stone Fabricators INC | Sabag Danny | — | (818) 572 8110 | Other | Woodland Hills · Los Angeles County | — | — |
| Ace Tek Roofing Co | Song Gun Kim | — | (310) 515 6611 | Other roofers | Gardena · Los Angeles County | — | — |
| Ace Thermal Mechanical INC | Cha Nop | — | (562) 219 9731 | HVAC | Paramount · Los Angeles County | — | — |
| Ace Tree Service INC | Jimenez Daniel | — | (818) 362 9071 | Tree | Sylmar · Los Angeles County | — | — |
| Ace Wallcovering & Painting | Ace Wallcovering & Painting | — | (310) 486 2985 | Windows, patio, painters | Redondo Beach · Los Angeles County | — | — |
| Ace Wrought Iron Work INC | In Chul Han | — | (310) 532 1123 | Other | Gardena · Los Angeles County | — | — |
| Ace-pro Plastering INC | Jose Antonio Elias | — | (310) 439 4315 | Other | Gardena · Los Angeles County | — | — |
| Acemd Corporation | Gang Li | — | (805) 259 7459 | GC, remodel, ADU | Diamond Bar · Los Angeles County | — | — |
| Acer Construction INC | Arthur Matinyan | — | (818) 531 8182 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| Aces Fire Protection INC | Armen Mousakhan | — | (818) 983 7227 | Other | Burbank · Los Angeles County | — | — |
| Acetek Roofing | Se Choon Oh | — | (323) 353 3175 | Other roofers | Los Angeles · Los Angeles County | — | — |
| Acevedo Electrical Services | Acevedo Alvarado David | — | (323) 742 5001 | Electricians | Montebello · Los Angeles County | — | — |
| Acevedo's Construction | Antonio Acevedo | — | (818) 510 8216 | GC, remodel, ADU | Pacoima · Los Angeles County | — | — |
| Acevedo's Painting | Manuel Acevedo-Trujillo | — | (323) 470 0943 | Windows, patio, painters | Inglewood · Los Angeles County | — | — |
| Acevedos Contractors INC | Joseph Joel Portillo | — | (323) 602 8650 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Aceves Roofing Services | Jose Guadalupe Aceves | — | (818) 800 8623 | Other roofers | Pacoima · Los Angeles County | — | — |
| Acg 32 Investments INC | Courtney Lisa Beck | — | (661) 255 1170 | Windows, patio, painters | Santa Clarita · Los Angeles County | — | — |
| Ach Air Systems INC | Allen Nazari Masihi | — | (818) 441 2924 | HVAC | Glendale · Los Angeles County | — | — |
| Ach Pro Painting | Santizo Angel Chanchavac | — | (323) 336 0167 | Windows, patio, painters | Los Angeles · Los Angeles County | — | — |
| Achc Air LLC | Yuxin Song | — | (626) 684 8391 | HVAC | Temple City · Los Angeles County | — | — |
| Achz Electric INC | Hao Fengguang | — | (626) 420 4868 | HVAC | Azusa · Los Angeles County | — | — |
| Aci Services | Maty Avidan | — | (310) 877 8666 | HVAC | Woodland Hills · Los Angeles County | — | — |
| Acies Iron Works LLC | Pacheco Eduardo | — | (323) 501 5146 | Other | Bell · Los Angeles County | — | — |
| Acker Resources | Acker Resources | — | (310) 422 0425 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Ackseen INC | Farhad Mahjoub | — | (818) 925 2627 | Other | Woodland Hills · Los Angeles County | — | — |
| Acm Construction | Cardenas Apolinar | — | (626) 875 9842 | GC, remodel, ADU | Pomona · Los Angeles County | — | — |
| Acm General Construction INC | Cintora Morales Alejandro | — | (818) 454 9620 | GC, remodel, ADU | Pacoima · Los Angeles County | — | — |
| Acm+ Environmental Services | Amaro Alfredo | — | (562) 633 3862 | GC, remodel, ADU | Paramount · Los Angeles County | — | — |