| A Plus Construction Corp | Jing Wang | — | (818) 445 1995 | GC, remodel, ADU | Rosemead · Los Angeles County | — | — |
| A Plus Design & Remodeling | Ben Simon Adam | — | (877) 888 6488 | GC, remodel, ADU | Van Nuys · Los Angeles County | — | — |
| A Plus Fire Protection | A Plus Fire Protection | — | (661) 285 1696 | Other | Palmdale · Los Angeles County | — | — |
| A Plus Gutter Systems INC | Israel Joshua Tanenbaum | — | (323) 405 4555 | Other | Los Angeles · Los Angeles County | — | — |
| A Plus One Stop Garage Doors & Service INC | Karl Lee Meidell | — | (661) 274 9552 | Other | Palmdale · Los Angeles County | — | — |
| A Plus Plumbing | A Plus Plumbing | — | (818) 243 8460 | Other | Glendale · Los Angeles County | — | — |
| A Plus Proactive Landscape Services | Marin Gerardo De La Rosa | — | (661) 438 6340 | Windows, patio, painters | Castaic · Los Angeles County | — | — |
| A Plus Refrigeration | Isaac Daniel Prystupa | — | (805) 556 4077 | HVAC | Burbank · Los Angeles County | — | — |
| A Plus Rooter Pro | A Plus Rooter Pro | — | (310) 800 4257 | Other | San Pedro · Los Angeles County | — | — |
| A Plus Tile Marble Stone | A Plus Tile Marble Stone | — | (310) 927 3666 | Other | Agoura Hills · Los Angeles County | — | — |
| A Prasad Plumbing Rooter Service | Vinay Sagar Pal | — | (626) 333 2525 | Other | La Puente · Los Angeles County | — | — |
| A Pro Construction Corp | Ademir Oswaldo Galan Banos | — | (323) 385 9971 | GC, remodel, ADU | Torrance · Los Angeles County | — | — |
| A Pro Lighting INC | John Stafford Whiteley | — | (562) 755 3218 | Electricians | La Mirada · Los Angeles County | — | — |
| A Pro Remodeling INC | Moshe Hanun | — | (818) 968 9958 | GC, remodel, ADU | Tarzana · Los Angeles County | — | — |
| A Q Construction INC | Alejandro Quevedo | — | (951) 545 4607 | GC, remodel, ADU | Duarte · Los Angeles County | — | — |
| A Q Management & Control | A Q Management & Control | — | (213) 305 0840 | GC, remodel, ADU | Encino · Los Angeles County | — | — |
| A Quality Construction | Timothy James Leitheiser | — | (818) 472 6972 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| A Quality Handyman Service INC | Keith Orlando Phillips | — | (310) 627 9153 | GC, remodel, ADU | Compton · Los Angeles County | — | — |
| A Quality Roofing | Jose Alberto Moon | — | (310) 806 5338 | Other roofers | Compton · Los Angeles County | — | — |
| A R & R Plumbing | A R & R Plumbing | — | (310) 717 4269 | Other | Harbor City · Los Angeles County | — | — |
| A R 4 Construction INC | Antony Arias Rodriguez | — | (818) 802 3232 | GC, remodel, ADU | Panorama City · Los Angeles County | — | — |
| A R A Construction | Arakelian Armine | info@araconstruction.com | (415) 999 1245 | Electricians | Montrose · Los Angeles County | — | — |
| A R A Painting | A R A Painting | — | (951) 333 8208 | Windows, patio, painters | Hawaiian Gardens · Los Angeles County | — | — |
| A R A Painting INC | Anselmo Ramirez | — | (323) 240 3841 | Windows, patio, painters | Los Angeles · Los Angeles County | — | — |
| A R A Remodel And Construction | Craig Emil-Louis Bordon | — | (310) 864 3015 | GC, remodel, ADU | Hermosa Beach · Los Angeles County | — | — |
| A R C & Associates INC | Alex Rivera | — | (818) 515 3310 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| A R C Construction & Maintenance | Kolossa Attila | — | (626) 975 3737 | GC, remodel, ADU | Pasadena · Los Angeles County | — | — |
| A R C Home Improvement INC | Christopher Roy Campus | — | (661) 236 1851 | GC, remodel, ADU | Lancaster · Los Angeles County | — | — |
| A R C Plumbing | A R C Plumbing | — | (310) 350 2459 | Other | Hawthorne · Los Angeles County | — | — |
| A R C Reglazing | A R C Reglazing | — | (323) 228 8947 | Other | Los Angeles · Los Angeles County | — | — |
| A R Drywall | A R Drywall | — | (626) 297 0250 | Other | Monterey Park · Los Angeles County | — | — |
| A R E Electrical | Alan Gene Roth | — | (661) 803 3326 | Electricians | Canyon Country · Los Angeles County | — | — |
| A R Electric | Ruiz Alfredo | — | (818) 387 5470 | Electricians | Acton · Los Angeles County | — | — |
| A R Electrical Services | Ariel Issac Recio Cardenas | — | (909) 843 7944 | Electricians | Claremont · Los Angeles County | — | — |
| A R I Builders Group INC | Elbaz Efrat | — | (888) 513 8444 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| A R Industries INC DBA Anthony Rosas Painting | Anthony Michael Rosas | — | (626) 332 8000 | Windows, patio, painters | Covina · Los Angeles County | — | — |
| A R K Construction | Aram Haroutune Arakelian | — | (562) 824 4267 | GC, remodel, ADU | Glendale · Los Angeles County | — | — |
| A R K Fire Protection Systems INC | Nicholas Gregory Khachatourian | — | (818) 266 7500 | Other | Sun Valley · Los Angeles County | — | — |
| A R M Industries INC | Michael Wayne Roseman | — | (818) 422 1262 | GC, remodel, ADU | Calabasas · Los Angeles County | — | — |
| A R M Roofing Specialists INC | Mendez Agustin Ramirez | armroofing18@gmail.com | (909) 573 6357 | Other roofers | Pomona · Los Angeles County | — | — |