| A-tech Systems INC | Bill Jay Amparano | — | (909) 444 9695 | Electricians | Hacienda Heights · Los Angeles County | — | — |
| A-twister Excavation INC | Fridman Ami | — | (818) 616 4204 | Other | Van Nuys · Los Angeles County | — | — |
| A-wong Construction | Wong Aaron | — | (626) 327 3328 | GC, remodel, ADU | Arcadia · Los Angeles County | — | — |
| A-z Builders & Design INC | Luis Adan Flores | — | (310) 409 6197 | GC, remodel, ADU | Van Nuys · Los Angeles County | — | — |
| A-z Building Solutions LLC | Miguel Hernandez | — | (818) 355 4427 | GC, remodel, ADU | Sun Valley · Los Angeles County | — | — |
| A-z Construction Enterprises INC | Ara Dimitian | — | (562) 531 4801 | GC, remodel, ADU | Paramount · Los Angeles County | — | — |
| A-z Construction Projects | Seyedmansour Sajed | — | (310) 804 2542 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| A-z General Construction INC | Jose Manuel Gonzalez | — | (323) 742 2296 | GC, remodel, ADU | Compton · Los Angeles County | — | — |
| A-z Glazing Corporation | Yi Liang | — | (626) 248 0662 | Windows, patio, painters | South El Monte · Los Angeles County | — | — |
| A-z Plumbing & Tankless | Garen Avetisyan | — | (818) 524 8276 | Other | North Hollywood · Los Angeles County | — | — |
| A-z Pool & Spa | A-z Pool & Spa | — | (310) 325 1059 | Electricians | Torrance · Los Angeles County | — | — |
| A.d.u. Builders | Joseph Anthony Fierro | — | (562) 552 0380 | GC, remodel, ADU | Montebello · Los Angeles County | — | — |
| A/c Care | Adam Ahmad Ghodosi | — | (818) 407 1900 | HVAC | Chatsworth · Los Angeles County | — | — |
| A/c Geeks Heating & Cooling INC | Hunanyan Suren | — | (888) 499 4966 | HVAC | Los Angeles · Los Angeles County | — | — |
| A/c Go Mini Split Installs | A/c Go Mini Split Installs | — | (562) 401 3861 | HVAC | Paramount · Los Angeles County | — | — |
| A/c Professional | A/c Professional | — | (818) 378 7054 | HVAC | Granada Hills · Los Angeles County | — | — |
| A/d Air Conditioning & Heating INC | Genchel Arie | — | (818) 780 8288 | HVAC | Van Nuys · Los Angeles County | — | — |
| A/d Alpha Electric INC | Leon Torres Adolfo De | — | (562) 416 4680 | Electricians | Lakewood · Los Angeles County | — | — |
| A1 American Roofing | Algem Nadav | — | (310) 405 0810 | Other roofers | Tarzana · Los Angeles County | — | — |
| A1 Asphalt Parking Lots | A1 Asphalt Parking Lots | — | (909) 599 0701 | Other | San Dimas · Los Angeles County | — | — |
| A1 Best Plumbing & Restoration | Vincent Joseph Attardo | — | (562) 981 2636 | GC, remodel, ADU | Signal Hill · Los Angeles County | — | — |
| A1 Carpet Market | Mhd Radwan Jaboulie | — | (818) 905 0500 | Other | Encino · Los Angeles County | — | — |
| A1 Construction | Chong Ki Yi | — | (213) 222 5552 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| A1 Construction & Remodeling INC | Tony Kohani | — | (818) 620 8187 | GC, remodel, ADU | Sherman Oaks · Los Angeles County | — | — |
| A1 Construction And Restoration INC | Iurii Zharkov | — | (951) 712 4722 | GC, remodel, ADU | Beverly Hills · Los Angeles County | — | — |
| A1 Electric | Soghomonyan Senik | — | (818) 649 4637 | Electricians | Glendale · Los Angeles County | — | — |
| A1 Elite Air Condition INC | Roy Dror Yehoshua | — | (818) 326 3399 | HVAC | Woodland Hills · Los Angeles County | — | — |
| A1 Fire Sprinkler LLC | Sterling John Brower | — | (310) 619 1552 | Other | Reseda · Los Angeles County | — | — |
| A1 Flooring INC | Gonzalo Jr Moran | — | (562) 370 5850 | Other | Huntington Park · Los Angeles County | — | — |
| A1 Home Builder | A1 Home Builder | — | (747) 324 0595 | Electricians | Palmdale · Los Angeles County | — | — |
| A1 Home Remodeling INC | Izakellian David | — | (310) 980 0662 | GC, remodel, ADU | Reseda · Los Angeles County | — | — |
| A1 HVAC Crew INC | Hector Hugo Diaz Gomez | — | (562) 578 8184 | HVAC | Whittier · Los Angeles County | — | — |
| A1 Industrial Heating & Cooling | A1 Industrial Heating & Cooling | — | (310) 699 9713 | HVAC | Los Angeles · Los Angeles County | — | — |
| A1 Painting Service | Astley Alexander Machuca | — | (310) 755 5158 | Windows, patio, painters | Whittier · Los Angeles County | — | — |
| A1 Plumbing Solutions | A1 Plumbing Solutions | — | (310) 748 7681 | Other | Harbor City · Los Angeles County | — | — |
| A1 Power Group INC | Alfred Hartoun Estepanian | a1powergroup@gmail.com | (818) 476 2472 | Electricians | Granada Hills · Los Angeles County | — | — |
| A1 Professional Plumbing INC | Gomez Jaime | — | (310) 854 9791 | Other | Inglewood · Los Angeles County | — | — |
| A1 Reglazing | Ortiz Ramiro Jimenez | — | (818) 974 9247 | Other | Los Angeles · Los Angeles County | — | — |
| A1 Sewer Solutions | A1 Sewer Solutions | — | (323) 202 5353 | Other | Los Angeles · Los Angeles County | — | — |
| A1 Standard Electrical | Covarrubias Salvador | — | (747) 309 0217 | Electricians | Winnetka · Los Angeles County | — | — |