| A-1 Best Development Group | Hubert William Tsang | — | (626) 757 2225 | GC, remodel, ADU | Temple City · Los Angeles County | — | — |
| A-1 California Builders | A-1 California Builders | — | (818) 222 1050 | GC, remodel, ADU | Calabasas · Los Angeles County | — | — |
| A-1 Construction | Shane Darnell Scanlon | — | (818) 709 4341 | GC, remodel, ADU | Chatsworth · Los Angeles County | — | — |
| A-1 Construction Building Services INC | Antonio Garcia | — | (562) 370 5958 | GC, remodel, ADU | Long Beach · Los Angeles County | — | — |
| A-1 Creative Design General Contracting | Bradley Lyle Barnes | — | (818) 648 2544 | GC, remodel, ADU | Canoga Park · Los Angeles County | — | — |
| A-1 Custom Stone And Tile | A-1 Custom Stone And Tile | — | (562) 755 6167 | Other | Whittier · Los Angeles County | — | — |
| A-1 Deck & Coating | A-1 Deck & Coating | — | (310) 560 0298 | Other | Torrance · Los Angeles County | — | — |
| A-1 Electric | Jules Wathan Iv Pruitt | — | (909) 624 7578 | Electricians | Claremont · Los Angeles County | — | — |
| A-1 Electric Service Company INC | Scott Thomas Pieper | — | (310) 204 1077 | Electricians | Culver City · Los Angeles County | — | — |
| A-1 Gate & Entry | A-1 Gate & Entry | — | (818) 363 7065 | Other | Mission Hills · Los Angeles County | — | — |
| A-1 Green Construction | Gevorg Keshishyan | — | (818) 929 8526 | GC, remodel, ADU | Granada Hills · Los Angeles County | — | — |
| A-1 Landscape Contractors | Gary Earl Mc Corkle | — | (562) 824 2161 | Windows, patio, painters | Long Beach · Los Angeles County | — | — |
| A-1 Ocean Breeze INC | William Louis Marcus | — | (661) 252 6800 | HVAC | Canyon Country · Los Angeles County | — | — |
| A-1 Pacific Tree Maintenance | A-1 Pacific Tree Maintenance | — | (661) 755 4949 | Tree | Palmdale · Los Angeles County | — | — |
| A-1 Plumbing Heating & Air Conditioning Services | Jason Howard Lischke | — | (866) 755 0470 | HVAC | Sherman Oaks · Los Angeles County | — | — |
| A-1 Quality Painters | A-1 Quality Painters | — | (909) 456 4561 | GC, remodel, ADU | La Verne · Los Angeles County | — | — |
| A-1 Rooter | A-1 Rooter | — | (626) 332 4810 | Other | Covina · Los Angeles County | — | — |
| A-1 Sewer Construction | Xavier Noel Ocampo | — | (818) 384 9518 | Other | Sylmar · Los Angeles County | — | — |
| A-1 Total Service Plumbing | Jeffrey Lee Butler | — | (818) 256 0422 | GC, remodel, ADU | Burbank · Los Angeles County | — | — |
| A-a Backflow Testing & Maintenance | Robert Perea | — | (310) 530 6663 | Electricians | Torrance · Los Angeles County | — | — |
| A-best Construction Corporation | Roberto Lee Uy | — | (818) 349 1308 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| A-c And D-c Electric | Cardenas Arthur | — | (626) 366 0483 | Electricians | West Covina · Los Angeles County | — | — |
| A-cp Rocker's Plumbing Service | Fortino Armando Franco Gonzalez | — | (213) 572 7206 | Other | Los Angeles · Los Angeles County | — | — |
| A-drains Plumbing | A-drains Plumbing | — | (844) 237 2467 | Other | Bellflower · Los Angeles County | — | — |
| A-drains Plumbing And Rooter INC | Adrian Junior Gonzalez | — | (844) 237 2467 | Other | Bellflower · Los Angeles County | — | — |
| A-first Electric LLC | Manuel Pablo Morales | — | (323) 493 7508 | Electricians | Bell Gardens · Los Angeles County | — | — |
| A-h Hi Tech Electric INC | Kavoossi Arash | — | (818) 521 5182 | Electricians | Winnetka · Los Angeles County | — | — |
| A-list Electric | William Oliver Moore | — | (818) 378 9188 | Electricians | Panorama City · Los Angeles County | — | — |
| A-n-g Builders | A-n-g Builders | — | (818) 915 1003 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| A-one Electric INC | Abraham Quintero Ramirez | — | (626) 541 5503 | Electricians | Baldwin Park · Los Angeles County | — | — |
| A-one/ware Plumbing | A-one/ware Plumbing | — | (310) 539 9136 | Other | Lomita · Los Angeles County | — | — |
| A-plus Garage Doors | A-plus Garage Doors | — | (661) 274 9559 | Other | Palmdale · Los Angeles County | — | — |
| A-pro Construction Services | Thomas Andrew Smithson | — | (424) 400 4067 | GC, remodel, ADU | Inglewood · Los Angeles County | — | — |
| A-pro Roofing INC | Murillo Cristian Maldonado | — | (661) 574 5657 | Other roofers | Palmdale · Los Angeles County | — | — |
| A-quick Rooter & Plumbing Company | Plasencia Ricardo | — | (562) 824 3384 | Other | Lakewood · Los Angeles County | — | — |
| A-shape | Armina Kyaramyan | — | (818) 987 2633 | GC, remodel, ADU | Venice · Los Angeles County | — | — |
| A-star Sign Co | Gyultemiryan Andranik | — | (818) 599 4714 | Other | North Hollywood · Los Angeles County | — | — |
| A-sure Builders | Mario Joel Salguero | — | (818) 429 1048 | GC, remodel, ADU | Tarzana · Los Angeles County | — | — |
| A-team Heating And Air Conditioning | A-team Heating And Air Conditioning | — | (661) 483 0563 | HVAC | Lancaster · Los Angeles County | — | — |
| A-team Pro Remodeling INC | Gerson Josue Moreno | — | (562) 688 5277 | GC, remodel, ADU | Norwalk · Los Angeles County | — | — |