| A-ev Installs | Liliana Rodriguez Phillips | — | (949) 469 4443 | EV chargers | Huntington Beach · Orange County | — | — |
| A-first Electric LLC | Manuel Pablo Morales | — | (323) 493 7508 | Electricians | Bell Gardens · Los Angeles County | — | — |
| A-g Construction Co | Oscar Guido Alcala | — | (619) 432 5084 | GC, remodel, ADU | Salinas · Monterey County | — | — |
| A-g Sod Farms INC | John William Addink | — | (951) 687 7581 | Windows, patio, painters | Riverside · Riverside County | — | — |
| A-genius HVAC INC | Hector Reggie Bonilla | — | (951) 250 5006 | HVAC | Rialto · San Bernardino County | — | — |
| A-h Construction INC | Andy Bao Hoang | sales@ahconstruction.com | (408) 216 3772 | Electricians | San Jose · Santa Clara County | — | — |
| A-h Hi Tech Electric INC | Kavoossi Arash | — | (818) 521 5182 | Electricians | Winnetka · Los Angeles County | — | — |
| A-intelec | Demetrius Francesco Duran | form.contact@aintelec.com | (858) 761 6121 | Electricians | San Diego · San Diego County | — | — |
| A-izzy Construction INC | Cesar Emigdio Ortiz Ruiz | — | (559) 560 8299 | GC, remodel, ADU | Porterville · Tulare County | — | — |
| A-jay Excavating INC | Jacqueline Ann Dallaire | — | (805) 466 0300 | Other | Atascadero · San Luis Obispo County | — | — |
| A-k Flooring INC | Andrey Kravchuk | — | (916) 519 4284 | Other | Carmichael · Sacramento County | — | — |
| A-list Electric | William Oliver Moore | — | (818) 378 9188 | Electricians | Panorama City · Los Angeles County | — | — |
| A-list Landscape LLC | Catlina Guadalupe Holani | — | (925) 430 8326 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| A-lite Electric Systems | Geoffrey Noel Wallace | — | (805) 896 4864 | Electricians | Santa Barbara · Santa Barbara County | — | — |
| A-mayer-can Plumbing | David Justin Mayer | — | (760) 277 1167 | Other | El Cajon · San Diego County | — | — |
| A-maze Plumbing Services | Aleksandr Viktorovich Loboda | — | (209) 495 9416 | Other | Modesto · Stanislaus County | — | — |
| A-n Roofing INC | Armando Tito Calvillo Martinez | — | (661) 699 4437 | Other roofers | Bakersfield · Kern County | — | — |
| A-n-g Builders | A-n-g Builders | — | (818) 915 1003 | GC, remodel, ADU | Woodland Hills · Los Angeles County | — | — |
| A-n-j Roth Electric INC | Glenn Anthony Roth | — | (831) 428-1424 | Electricians | Soquel · Santa Cruz County | — | — |
| A-one | James Mitchel Keeton | — | (559) 255 0180 | GC, remodel, ADU | Fresno · Fresno County | — | — |
| A-one Concrete Resurfacing | A-one Concrete Resurfacing | — | (760) 844 0056 | Other | Thousand Palms · Riverside County | — | — |
| A-one Electric INC | Abraham Quintero Ramirez | — | (626) 541 5503 | Electricians | Baldwin Park · Los Angeles County | — | — |
| A-one Patios | A-one Patios | — | (951) 805 1235 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| A-one/ware Plumbing | A-one/ware Plumbing | — | (310) 539 9136 | Other | Lomita · Los Angeles County | — | — |
| A-plus Businesses INC | Stephen Craig Peake | — | (714) 709 7730 | GC, remodel, ADU | Rancho Santa Margarita · Orange County | — | — |
| A-plus Construction | Anita Dannette Mafoa | — | (951) 354 2454 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| A-plus Custom Painting INC | Alva Jake Johnny Joosten | interested@domainmarket.com | (559) 733 3618 | Windows, patio, painters | Visalia · Tulare County | — | — |
| A-plus Garage Doors | A-plus Garage Doors | — | (661) 274 9559 | Other | Palmdale · Los Angeles County | — | — |
| A-plus Painting Company INC | Juan Enrique Salazar | — | (925) 325 7949 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| A-plus Quality Construction | Noory Ismatullah | — | (310) 612 1354 | GC, remodel, ADU | Irvine · Orange 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-pro Security Services INC | Gregory Kipnis | — | (949) 635 0300 | Alarm and generators | Trabuco Canyon · Orange County | — | — |
| A-quality Construction Company | Lana Mae Donnelly | — | (909) 565 6007 | GC, remodel, ADU | Pinon Hills · San Bernardino County | — | — |
| A-quick Rooter & Plumbing Company | Plasencia Ricardo | — | (562) 824 3384 | Other | Lakewood · Los Angeles County | — | — |
| A-r Incorporated | David Israel Aldama Roman | — | (909) 600 4251 | HVAC | Running Springs · San Bernardino County | — | — |
| A-s Electric | Adan Heber Salgado | — | (559) 604 2550 | Electricians | Visalia · Tulare County | — | — |
| A-s Pipelines INC | John Paul Arcidiacono | — | (925) 671 7711 | Other | Concord · Contra Costa County | — | — |
| A-s-z Construction INC | Alberto Zatarain | — | (760) 898 1612 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| A-shape | Armina Kyaramyan | — | (818) 987 2633 | GC, remodel, ADU | Venice · Los Angeles County | — | — |