| A. G. Davi Property Management | A. G. Davi Property Management | — | (831) 373-2222 | Property managers | Monterey · Monterey County | — | — |
| A. Nichols Tree Service And Excavating | A. Nichols Tree Service And Excavating | — | (707) 272-3362 | Tree | Cobb · Colusa County | — | — |
| A. Ortiz Landscaping Corporation | Adolfo Ortiz | — | (925) 529 5843 | Windows, patio, painters | Oakley · Contra Costa County | — | — |
| A. Upland Fire Protection INC | Eduardo Jeff | — | (909) 630 2660 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A.b.o Tree Service | A.b.o Tree Service | — | (559) 939-7377 | Tree | Fresno · Fresno County | — | — |
| A.d.u. Builders | Joseph Anthony Fierro | — | (562) 552 0380 | GC, remodel, ADU | Montebello · Los Angeles County | — | — |
| A.e.edwards Company Inc. | Allen Burton Edwards | — | (916) 616 6373 | GC, remodel, ADU | Lincoln · Placer County | — | — |
| A.g & A Construction | Mario Alejandro Aguirre Duran | — | (805) 598 6778 | GC, remodel, ADU | Santa Maria · Santa Barbara County | — | — |
| A.j.p Roofing | Becerra Alejandro Perez | — | (909) 747 2259 | Other roofers | Upland · San Bernardino County | — | — |
| A.l.o.s Construction INC | Jesus Manuel Juarez | — | (650) 771 6167 | GC, remodel, ADU | Campbell · Santa Clara County | — | — |
| A.l.s Construction & Home Repair Inc. | Ouida Eraine Reed | — | (209) 334 9414 | Other roofers | Lodi · San Joaquin County | — | — |
| A.m. Sun Solar | Salvador Roger Jose Alegre | hello@amsunsolar.com | (805) 772 6786 | Other roofers | Paso Robles · San Luis Obispo County | — | — |
| A.r.c | Alexander William Ruess | — | (530) 209 0441 | Other | Redding · Shasta County | — | — |
| A.z.g Construction INC | Gonzalez Alejandro Zaragoza | — | (562) 287 3293 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| A/c & Heat Services INC | Pete Charles Villasenor | — | (909) 566 4241 | HVAC | Fontana · San Bernardino County | — | — |
| A/c Benton Electric | Christopher Joseph Wolfgram | acelectric1984@yahoo.com | (916) 769 5623 | Electricians | Granite Bay · Placer County | — | — |
| A/c Care | Adam Ahmad Ghodosi | — | (818) 407 1900 | HVAC | Chatsworth · Los Angeles County | — | — |
| A/c Doctors Tv INC | Larry Dean Morrow | — | (760) 566 9335 | HVAC | Oceanside · San Diego County | — | — |
| A/c Electric Design INC | Cassar Anthony | — | (650) 333 1406 | Electricians | Redwood City · San Mateo County | — | — |
| A/c Fire Protection Company | Julie Ann Schram | info@acfireprotection.com | (805) 658 6809 | Other | Ventura · Ventura 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 Guys Cooling And Heating INC | Ulises Alcantara | — | (925) 596 8888 | HVAC | Pleasanton · Alameda County | — | — |
| A/c Man | A/c Man | — | (951) 284 9349 | HVAC | San Bernardino · San Bernardino County | — | — |
| A/c One INC | Orlando Antonio Lopez Cabrera | — | (310) 310 5972 | HVAC | Simi Valley · Ventura County | — | — |
| A/c Pro Heating & Cooling | A/c Pro Heating & Cooling | — | (559) 737 3133 | HVAC | Tulare · Tulare 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 | — | — |
| A/s General Contracting | Ali Seyyed Shojai | — | (619) 379 9410 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| A1 - Electric | Juan Carlos Jimenez | — | (951) 662 8884 | Electricians | Lake Elsinore · Riverside County | — | — |
| A1 Abatement Group INC | Norman Ronald Bautista | — | (415) 479 0600 | Other | San Rafael · Marin County | — | — |
| A1 Affordable Plumbing & Water Heaters | Shtulvarg Zeev | — | (916) 488 7283 | Other | El Dorado Hills · El Dorado 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 Audio | A1 Audio | — | (559) 656-7999 | Alarm and generators | Tulare · Tulare County | — | — |
| A1 Backflow Service INC | Cary James White | — | (209) 607 7383 | Other | Manteca · San Joaquin County | — | — |
| A1 Bay Area Glass | A1 Bay Area Glass | — | (408) 910 9878 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| A1 Bay Area Painters INC | Santhosh Kumar Reddy Kanjula | — | (925) 389 1722 | Windows, patio, painters | San Ramon · Contra Costa County | — | — |
| A1 Bayarea Landscape INC | Lucio Patricio Calderon Escobar | — | (415) 717 9509 | Windows, patio, painters | San Rafael · Marin County | — | — |