| A D I Fire Protection INC | Wilber Alexander Martinez-Monterrosa | — | (818) 941 8645 | Other | Sun Valley · Los Angeles County | — | — |
| A D Improvements INC | Acosta Roberto | — | (562) 803 6134 | GC, remodel, ADU | Downey · Los Angeles County | — | — |
| A D Investor LLC | Wayne Kin Chang | — | (626) 228 5570 | GC, remodel, ADU | Monterey Park · Los Angeles County | — | — |
| A D Iron Work INC | Alberto Diaz | — | (818) 437 0917 | GC, remodel, ADU | Sylmar · Los Angeles County | — | — |
| A D L Window Coverings | Anthony Alejandro Mendoza | — | (310) 866 9435 | Other | Palmdale · Los Angeles County | — | — |
| A D M Builders INC | Mihessian Ardush Der | — | (818) 535 5572 | GC, remodel, ADU | Encino · Los Angeles County | — | — |
| A D M Electric | Bitton Isaac | — | (213) 479 8391 | Electricians | Valley Village · Los Angeles County | — | — |
| A D M Electric INC | Isaac Bitton | — | (818) 961 4072 | Electricians | Valley Glen · Los Angeles County | — | — |
| A D M Painting And Construction | Lozano Julio | — | (310) 912 5736 | GC, remodel, ADU | Cudahy · Los Angeles County | — | — |
| A D N Plumbing | A D N Plumbing | — | (818) 266 2219 | Other | Northridge · Los Angeles County | — | — |
| A D Painting | A D Painting | — | (562) 863 3881 | Windows, patio, painters | Norwalk · Los Angeles County | — | — |
| A D Plumbing & Contractors INC | Abel Puerta Ramirez | — | (818) 437 0335 | GC, remodel, ADU | Arleta · Los Angeles County | — | — |
| A D R Construction Innovators INC | Alfonso Rodriguez Alcaraz | — | (661) 803 9730 | GC, remodel, ADU | Santa Clarita · Los Angeles County | — | — |
| A D R Security Systems INC | Nejad Ataola Esmaily | — | (213) 622 5969 | Electricians | Los Angeles · Los Angeles County | — | — |
| A D Security INC | Adam David Stelzer | — | (626) 255 1562 | Alarm and generators | Sierra Madre · Los Angeles County | — | — |
| A D T Lectric | A D T Lectric | — | (323) 240 2454 | Electricians | Los Angeles · Los Angeles County | — | — |
| A D Tile & Stone | A D Tile & Stone | — | (818) 635 6747 | Other | Glendale · Los Angeles County | — | — |
| A Drain Doctor | A Drain Doctor | — | (626) 332 9984 | Other | Walnut · Los Angeles County | — | — |
| A E Alliance Contractors | Oscar Sinai Bianchi | — | (323) 365 3738 | GC, remodel, ADU | Downey · Los Angeles County | — | — |
| A E C | A E C | — | (818) 731 4731 | Electricians | Burbank · Los Angeles County | — | — |
| A E C Electric | Brian Evans Shelton | — | (626) 398 3052 | Electricians | Pasadena · Los Angeles County | — | — |
| A E Construction & Environmental Services | Enrique Antonio Jimenez | — | (562) 244 4609 | GC, remodel, ADU | Downey · Los Angeles County | — | — |
| A E Construction Services INC | Ian Isaac Spiszman | — | (818) 543 3930 | GC, remodel, ADU | Glendale · Los Angeles County | — | — |
| A E D Construction | Aharoni Yitzhak | — | (818) 262 7272 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| A E D Contractors | Alfredo Diaz Rodriguez | — | (909) 374 2597 | Electricians | Diamond Bar · Los Angeles County | — | — |
| A E Enterprises | Adrian Eric Sean Holder | — | (818) 388 8197 | GC, remodel, ADU | Chatsworth · Los Angeles County | — | — |
| A E HVAC & Electrical INC | Milorad Milosevic | — | (213) 304 7124 | HVAC | Los Angeles · Los Angeles County | — | — |
| A E I General Contractors | Sergio Luis Dovarro | — | (562) 746 7250 | Electricians | Downey · Los Angeles County | — | — |
| A E K Construction | Abdo Elias El Kassouf | — | (818) 522 2261 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| A E Mora Plumbing | A E Mora Plumbing | — | (951) 217 0364 | Other | La Verne · Los Angeles County | — | — |
| A E S Plumbing | A E S Plumbing | — | (310) 344 7694 | Other | San Pedro · Los Angeles County | — | — |
| A Electrical Enterprise | Erick Eduardo Escalante Marroquin | — | (626) 620 1465 | HVAC | Northridge · Los Angeles County | — | — |
| A Esmond Construction | Andrew David Esmond | — | (310) 703 3451 | GC, remodel, ADU | Santa Monica · Los Angeles County | — | — |
| A F Air Conditioning & Heating INC | Mahnaz Payan | — | (818) 571 9938 | HVAC | Agoura · Los Angeles County | — | — |
| A F Brown Electrical Contractors INC | Alexander Federico Brown | — | (310) 725 9070 | Electricians | Redondo Beach · Los Angeles County | — | — |
| A F C O Development Co INC | Afari Frank | — | (310) 720 1453 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| A F D Demolition & Plumbing | Christopher Matthew Dennis | — | (310) 650 3827 | Other | Lawndale · Los Angeles County | — | — |
| A F Fabricators | A F Fabricators | — | (562) 395 2369 | Other | Pico Rivera · Los Angeles County | — | — |
| A F J Electric | Alfred Gongora Jr Fernandez | — | (562) 225 8582 | Electricians | Long Beach · Los Angeles County | — | — |
| A F R Masonry | A F R Masonry | — | (626) 705 5868 | GC, remodel, ADU | South El Monte · Los Angeles County | — | — |