| A3 Construction | Armando Jr Aparicio | — | (619) 551 3297 | Other | Chula Vista · San Diego County | — | — |
| A3 Mechanical Systems | A3 Mechanical Systems | — | (408) 639 8255 | HVAC | San Jose · Santa Clara County | — | — |
| A3 Pipeline | Alfredo Gonzalez | — | (415) 300 0364 | Other | San Francisco · San Francisco County | — | — |
| A3 Plumbing INC | Homero Sanchez Munoz | — | (661) 215 6521 | Other | Bakersfield · Kern County | — | — |
| A3 Pro West | A3 Pro West | impallari@gmail.com | (805) 888 7194 | Other roofers | Brentwood · Contra Costa County | — | — |
| A3 Remodeling | Alfredo Jr Flores | — | (619) 772 3545 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| A3 Smart Home LP DBA Aaa Smart Home | Lance Allen Chapman | — | (925) 840 4777 | Electricians | Walnut Creek · Contra Costa County | — | — |
| A3 Tech Solutions | A3 Tech Solutions | — | (844) 930 1227 | Other | Van Nuys · Los Angeles County | — | — |
| A3 Visual | Joseph Michael Flannery | — | (310) 836 3200 | Other | Los Angeles · Los Angeles County | — | — |
| A3 Wall Systems INC | James Jr Amburgey | — | (805) 459 0722 | Other | Santa Maria · Santa Barbara County | — | — |
| A4 Builders LLC | Justin Claude Allen | — | (530) 410 5455 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| A4 Heating And Air | A4 Heating And Air | — | (408) 415 0782 | HVAC | Gilroy · Santa Clara County | — | — |
| A4 Homes | Christopher Michael Adams | — | (415) 318 0793 | GC, remodel, ADU | Menlo Park · San Mateo County | — | — |
| A4 Painting | A4 Painting | a4paintingcompany@gmail.com | (760) 240 7442 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| A4g Landscaping | A4g Landscaping | — | (209) 224 6310 | Windows, patio, painters | Lockeford · San Joaquin County | — | — |
| A4welding Structural Steel | Alvaro Leonel Sr Martinez | — | (951) 850 3030 | Other | Riverside · Riverside County | — | — |
| A5 Builders | Alfredo Gonzalez | — | (510) 374 9845 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A5 Design Build INC | Abrahim Aide Asmaiel | — | (626) 691 8399 | GC, remodel, ADU | Alhambra · Los Angeles County | — | — |
| A5 Drywall INC | Alberto Anguiano Colmenero | — | (831) 524 7926 | Other | Hollister · San Benito County | — | — |
| A5 Energy Corp | Dean Matthew Stevenson | — | (916) 768 1524 | Electricians | Granite Bay · Placer County | — | — |
| A5 Floors INC | Jose Alfredo Palmer-gonzalez | — | (510) 472 5568 | Other | Antioch · Contra Costa County | — | — |
| A5 Landscape Co | Gerardo Nevarez | — | (916) 600 4410 | Windows, patio, painters | Elk Grove · Sacramento County | — | — |
| A6 Plumbing INC | Juan Manuel Alvarez | — | (818) 357 7019 | Other | Saugus · Los Angeles County | — | — |
| A7 Construction INC | Tam Hai Duong | — | (408) 505 8830 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| A81 Framing INC | Alejandro Juvenal Pacheco Santiago | — | (559) 307 6648 | Other | Fresno · Fresno County | — | — |
| A9 Construction | Steven Wayne Harrison | impallari@gmail.com | (707) 477 1086 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Aa & Aa Drywall | Alfonso Arias-Villa | — | (916) 813 4177 | Other | Citrus Heights · Sacramento County | — | — |
| Aa & Art Framing INC | Gerson Estuardo Hernandez Vasquez | — | (408) 360 7885 | Other | San Jose · Santa Clara County | — | — |
| Aa All Pro Construction INC | Alejandro Canales | — | (310) 938 0794 | GC, remodel, ADU | Rolling Hills Estates · Los Angeles County | — | — |
| Aa All Pro Construction LLC | Jesus Alejandro Canales | — | (310) 938 0794 | GC, remodel, ADU | Rolling Hills Estates · Los Angeles County | — | — |
| Aa Atlas Plumbing Heating & Air Conditioning | Randy Robert Sousa | — | (714) 970 5885 | HVAC | Yorba Linda · Orange County | — | — |
| Aa Blue Line Plumbing INC | Oren Ofir | — | (818) 571 1140 | Other | Encino · Los Angeles County | — | — |
| Aa Bronco Concrete | Aa Bronco Concrete | — | (619) 920 8894 | Other | San Diego · San Diego County | — | — |
| Aa Builder | Aa Builder | — | (530) 774 6858 | GC, remodel, ADU | Chico · Butte County | — | — |
| Aa Builder | Aa Builder | — | (916) 534 6810 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |
| Aa Cabinetry INC | Lei Zhang | — | (626) 217 5451 | Other | Pomona · Los Angeles County | — | — |
| Aa Cali Construction | Alanis Omar Alzate | — | (661) 317 7920 | Other | Woodland Hills · Los Angeles County | — | — |
| Aa California Roofing | Aa California Roofing | — | (877) 367-6304 | Other roofers | Woodland Hills · Ventura County | — | — |
| Aa Cedar Construction | Ahmed Yassine | — | (626) 856 9576 | GC, remodel, ADU | La Verne · Los Angeles County | — | — |
| Aa Color Solutions | Aa Color Solutions | — | (951) 834 2615 | Windows, patio, painters | Murrieta · Riverside County | — | — |