| A T A Heating & Air Conditioning INC | Varon Lior | — | (818) 331 0606 | HVAC | Woodland Hills · Los Angeles County | — | — |
| A T A Plumbing & Construction INC | Albert Ataian | — | (323) 551 5945 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| A T And T Z Electrical Contractor INC | Albert Khachikian | — | (310) 864 5007 | Electricians | Mission Hills · Los Angeles County | — | — |
| A T C | A T C | — | (707) 499 2618 | Electricians | Mc Kinleyville · Humboldt County | — | — |
| A T C Construction | Michael Charles Greendale | — | (916) 607 6765 | GC, remodel, ADU | Folsom · Sacramento County | — | — |
| A T C Construction | Victor John Valdez | — | (661) 319 9316 | GC, remodel, ADU | Bakersfield · Kern County | — | — |
| A T C Construction INC | Cory William Robertson | — | (949) 215 2987 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| A T C Design Center INC | Amos Tamam | atcdesigncenter@gmail.com | (510) 945 0877 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| A T C Plumbing Source INC | Hector Cruz Gonzalez | — | (614) 988 0794 | Other | San Diego · San Diego County | — | — |
| A T C Telecommunications Services | Roger Duncan Mc Diarmid | — | (916) 965 7626 | Other | Fair Oaks · Sacramento County | — | — |
| A T C Wood Works INC | Alon Federman | — | (818) 535 7722 | GC, remodel, ADU | Canoga Park · Los Angeles County | — | — |
| A T Concrete Services INC | Alexis Manuel Aceves Medina | — | (650) 385 1109 | Other | Hayward · Alameda County | — | — |
| A T Construction | Allen Ka Wai Tam | — | (510) 367 7795 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| A T Construction | Terzi Vladimir | — | (916) 613 4683 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |
| A T Construction | Allan Macdonald Tate | — | (650) 208 2341 | GC, remodel, ADU | Redwood City · San Mateo County | — | — |
| A T Construction | Topich Andrew | — | (916) 216 4875 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |
| A T Construction | Larry Andrew Ii Trihub | — | (530) 362 0178 | GC, remodel, ADU | Grass Valley · Nevada County | — | — |
| A T Construction & Assoc | Scott Alan Brown | — | (858) 254 9484 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| A T Construction & Consultant | Tashakori Ali | — | (310) 994 2820 | GC, remodel, ADU | Rolling Hills · Los Angeles County | — | — |
| A T Custom Cabinets INC | Tostado Alberto | — | (818) 347 0740 | Other | Canoga Park · Los Angeles County | — | — |
| A T Custom Tile And Stone | Alfred Gabriel Torres | — | (951) 375 0525 | Other | San Jacinto · Riverside County | — | — |
| A T D Construction Group INC | Andrew T Dinh | — | (408) 430 3060 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| A T D Design | A T D Design | ash@atddesign.com | (916) 417 8252 | Other | Carmichael · Sacramento County | — | — |
| A T D Garage Door | A T D Garage Door | danneely1958@gmail.com | (760) 591-9032 | Other | San Marcos · San Diego County | — | — |
| A T D Lock & Security INC | Orly Zevulun | — | (818) 883 7199 | Alarm and generators | Tarzana · Los Angeles County | — | — |
| A T D Tile | A T D Tile | — | (415) 225 5340 | Other | San Francisco · San Francisco County | — | — |
| A T D Tile Co | Kwang Il Choe | — | (916) 704 1725 | Other | Rancho Cordova · Sacramento County | — | — |
| A T D Window Tinting | Devin Thomas Wayner | — | (805) 239 5887 | Other | Templeton · San Luis Obispo County | — | — |
| A T Dabasinskas Co LLC | Austin Thomas Dabasinskas | — | (714) 349 3016 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A T E C Electric | Edward John Chavarria | — | (805) 929 6087 | Electricians | Nipomo · San Luis Obispo County | — | — |
| A T Electric | Anh D Tran | — | (619) 791 6173 | Electricians | San Diego · San Diego County | — | — |
| A T Electric | Arthur John Tielman | — | (818) 674 1862 | Electricians | Simi Valley · Ventura County | — | — |
| A T Enterprise Construction | Tabani Alireza | — | (818) 287 9024 | GC, remodel, ADU | Canoga Park · Los Angeles County | — | — |
| A T H Construction | David Kenneth Wysong | — | (818) 268 8188 | GC, remodel, ADU | Northridge · Los Angeles County | — | — |
| A T H Construction | Anthony Todd Hahner | — | (951) 538 0987 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| A T H Plumbing & Remodeling INC | Hayrapetian Andre | — | (818) 482 5805 | Other | Glendale · Los Angeles County | — | — |
| A T INC | Luis Alberto Alvarez | — | (530) 693 0269 | Other | Oroville · Butte County | — | — |
| A T J Construction | Tania Erendira Anaya | — | (909) 957 3335 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| A T L Electric | Thomas A Laluk | — | (714) 580 6163 | Electricians | Laguna Niguel · Orange County | — | — |
| A T Landscaping | Jose Alejandro Torres Magana | info@atlandscaping.com | (559) 394 2251 | Windows, patio, painters | Fresno · Fresno County | — | — |