| Advanced Property Inspections | Advanced Property Inspections | — | (818) 247-7771 | Inspectors | Glendale · Los Angeles County | — | — |
| Advanced Refrigeration | Advanced Refrigeration | — | (310) 318 2878 | HVAC | Torrance · Los Angeles County | — | — |
| Advanced Remodeling Corporation | Julio Cesar Padilla | — | (424) 391 2777 | GC, remodel, ADU | Hawthorne · Los Angeles County | — | — |
| Advanced Restoration & Construction | Tal Shitrit | — | (818) 223 7967 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Advanced Roofing And Sons INC | Eugene Louie Victoria | — | (626) 622 6008 | Other roofers | Glendora · Los Angeles County | — | — |
| Advanced Roofing Systems INC | Carlos Geovani Castillo | carlos@arsi.la | (213) 880 0778 | Other roofers | Long Beach · Los Angeles County | — | — |
| Advanced Shotcrete INC | Edgar Manuel Cardenas | — | (661) 273 0644 | Other | Lancaster · Los Angeles County | — | — |
| Advanced Sign & Banner | Yushea Joher Surti | — | (818) 346 2142 | Other | Chatsworth · Los Angeles County | — | — |
| Advanced Sign Tech INC | Glen H Kim | — | (323) 488 0238 | Other | Commerce · Los Angeles County | — | — |
| Advanced Signs By Nick | Advanced Signs By Nick | — | (661) 723 4880 | Other | Lancaster · Los Angeles County | — | — |
| Advanced Tankless And Plumbing | Advanced Tankless And Plumbing | — | (909) 977 1365 | Other | Diamond Bar · Los Angeles County | — | — |
| Advanced Tech Air Systems INC | Richard Ruiz | — | (310) 878 3759 | HVAC | Granada Hills · Los Angeles County | — | — |
| Advanced Tectonics | Richard Joseph Dever | — | (424) 210 9900 | GC, remodel, ADU | San Pedro · Los Angeles County | — | — |
| Advanced Water & Power | Advanced Water & Power | — | (909) 274 0377 | Electricians | Claremont · Los Angeles County | — | — |
| Advanced West Coast Welding | Advanced West Coast Welding | — | (661) 373 1471 | Other | Canyon Country · Los Angeles County | — | — |
| Advanced Wildfire Protection | Birch Wellington Pender | — | (661) 400 0219 | GC, remodel, ADU | Palmdale · Los Angeles County | — | — |
| Advancing Communities Together | David Barron Woodman | — | (661) 266 8900 | GC, remodel, ADU | Palmdale · Los Angeles County | — | — |
| Advaned Polhesar Lighting | Advaned Polhesar Lighting | — | (310) 500 0589 | Electricians | Winnetka · Los Angeles County | — | — |
| Advantage Air | Milan Kumar Chawla | — | (800) 709 7297 | HVAC | Long Beach · Los Angeles County | — | — |
| Advantage Design & Build | Ceasar Macias | — | (626) 890 8218 | GC, remodel, ADU | Claremont · Los Angeles County | — | — |
| Advantage Hardscapes INC | Francisco Javier Benitez Flores | — | (661) 483 0989 | Windows, patio, painters | Lancaster · Los Angeles County | — | — |
| Advantage Plumbing And Rooter INC | Steve Hutkin | — | (626) 956 3708 | Other | Montrose · Los Angeles County | — | — |
| Advantage Project Builders | Joel Nathan Williams | — | (626) 393 2207 | Electricians | Azusa · Los Angeles County | — | — |
| Advantage Tile Stone Design | John Lee Gragg | — | (661) 406 7991 | Other | Stevenson Ranch · Los Angeles County | — | — |
| Advantagesignservice INC | Rogelio Ortiz | — | (424) 262 1769 | Other | Wilmington · Los Angeles County | — | — |
| Advent Concepts INC | Montoya Johan | — | (562) 741 7422 | GC, remodel, ADU | Montebello · Los Angeles County | — | — |
| Advex Sign Design | Ryan Michael Arechiga | — | (323) 803 8136 | Other | Los Angeles · Los Angeles County | — | — |
| Advise Re Developers INC | Stephen Abraham Morris | — | (310) 795 4370 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Advtech Environmental INC | Michael Edward Shiang | — | (626) 339 3234 | Other | Rowland Heights · Los Angeles County | — | — |
| Adw Construction Works | Alejandro Duarte | — | (323) 359 3720 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| Adx Consulting LLC | Ronald E Fangmeyer | — | (562) 822 8741 | HVAC | Long Beach · Los Angeles County | — | — |
| Ady Service | Hatem Adib Eljurdi | — | (818) 401 5555 | GC, remodel, ADU | Sherman Oaks · Los Angeles County | — | — |
| Ae Audio Video INC | Mikel Paul Zimmerman | — | (818) 908 8801 | Other | Granada Hills · Los Angeles County | — | — |
| Ae Builders LLC | Engelberg Andrew | — | (818) 358 5269 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| Ae Havc | Austin Jun Liu | — | (909) 680 0269 | HVAC | La Puente · Los Angeles County | — | — |
| Ae Modern Builders INC | Juan Carlos Espinoza | — | (626) 705 7379 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| Ae Technic INC | Homan Amzajerdian | — | (213) 300 6051 | HVAC | Glendora · Los Angeles County | — | — |
| Ae3 Construction Co | Armen Eyssakhanian | — | (818) 913 7923 | GC, remodel, ADU | Glendale · Los Angeles County | — | — |
| Aecom Technical Services INC | Glen Thomas Davis | — | (213) 593 8100 | Electricians | Los Angeles · Los Angeles County | — | — |
| Aed | Gary Lin | — | (626) 831 8138 | GC, remodel, ADU | San Marino · Los Angeles County | — | — |