| A T M And Safes Services INC | Francisco J Atilano De La Torre | — | (360) 200 9915 | GC, remodel, ADU | West Covina · Los Angeles County | — | — |
| A T M Construction | Timothy Michael Murphy | — | (805) 300 5776 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| A T M Construction | Ali Asghar Toraby-moghadam | — | (510) 435 5900 | Electricians | Berkeley · Alameda County | — | — |
| A T M Custom Wood Floors INC | Tania Zenaida Carmona | — | (818) 625 5361 | Other | San Bernardino · San Bernardino County | — | — |
| A T Mechanical | A T Mechanical | — | (916) 335 4447 | HVAC | Antelope · Sacramento County | — | — |
| A T O M Plumbing | A T O M Plumbing | — | (510) 565 9550 | Other | Vallejo · Solano County | — | — |
| A T P Audio/video & Electric | Christopher Ryan Topper | — | (949) 521 1310 | Electricians | Newport Beach · Orange County | — | — |
| A T Pearl Electric | Turner Doyle | info@atpearlelectric.com | (760) 330-5323 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| A T Plumbing Company | Tevanian Alfred | — | (818) 288 8251 | Electricians | Burbank · Los Angeles County | — | — |
| A T Prime Builders | Tachinskiy Andrey | — | (916) 531 7775 | GC, remodel, ADU | Antelope · Sacramento County | — | — |
| A T S | Peter Francis Murphy | — | (707) 337 3190 | Other | Napa · Napa County | — | — |
| A T S Communications INC | Thomas Paul Klosterman | — | (925) 602 1500 | Other | Concord · Contra Costa County | — | — |
| A T S Construction | Edward James Marquez | — | (909) 322 7202 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| A T S Construction | Tdoot Chien Saelee | — | (916) 267 1997 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |
| A T S Construction | Thomas Michael Eggert | — | (619) 439 2164 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| A T S Design And Construction | Shafiq Rahman | — | (310) 259 5697 | GC, remodel, ADU | Torrance · Los Angeles County | — | — |
| A T S Heating And Air Services | Singh Atish | — | (916) 910 4367 | HVAC | Sacramento · Sacramento County | — | — |
| A T S Integration INC | Michael Haydn Pedrick | — | (415) 499 3500 | Electricians | San Rafael · Marin County | — | — |
| A T T Construction | Audencio Tilapa-Tepetlanco | — | (818) 212 7389 | GC, remodel, ADU | North Hollywood · Los Angeles County | — | — |
| A T Thompson Contractor | A T Thompson Contractor | — | (714) 458 2415 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| A T Vardi Incorporated | Gidon Reznik Vardi | — | (562) 606 2010 | Electricians | Long Beach · Los Angeles County | — | — |
| A T W Construction | Andrew Tristan Wattenburger | — | (707) 972 7797 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| A T W Construction INC | Michael Aaron Wilhoit | — | (760) 256 6451 | GC, remodel, ADU | Barstow · San Bernardino County | — | — |
| A T Weber Plumbing & Mechanical Services INC | Andrew Todd Weber | — | (510) 523 0628 | HVAC | Alameda · Alameda County | — | — |
| A T Welding Fabrication | A T Welding Fabrication | — | (661) 748 9989 | Other | Shafter · Kern County | — | — |
| A Tac Exterminators Inc. | A Tac Exterminators Inc. | — | (949) 633-8475 | Pest, tile roofs | Beaumont · Modoc County | — | — |
| A Tall Tree Service INC | Timothy Wayne Rantz | — | (535) 525 1013 | Tree | Tahoma · Placer County | — | — |
| A Tamam Construction INC | Yossi Alkaslasi | — | (408) 478 3111 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| A Team Builders Group INC | Michael Lawrence Adams | — | (818) 625 2598 | GC, remodel, ADU | Studio City · Los Angeles County | — | — |
| A Team Electrical | Gregory Jacques Madaoui | — | (760) 331 9769 | Electricians | Del Mar · San Diego County | — | — |
| A Team Fencing INC | Janel Ryan Armet | — | (805) 238 9165 | Other | Templeton · San Luis Obispo County | — | — |
| A Team Garage Doors | Carlos Alfredo Godinez | — | (760) 554 5273 | Other | Cathedral City · Riverside County | — | — |
| A Team Plumbing Services INC | Robert Jaime Ferman | — | (818) 224 9771 | Other | Sun Valley · Los Angeles County | — | — |
| A Team Renovation | Roi Rabinek | — | (310) 717 2223 | GC, remodel, ADU | North Hollywood · Los Angeles County | — | — |
| A Tech Electric And Mechanical | David William Robertson | — | (916) 699 7500 | HVAC | Citrus Heights · Sacramento County | — | — |
| A Tech Garage Door Solutions | A Tech Garage Door Solutions | atechgaragedoor805@gmail.com | (805) 268 9865 | Other | Santa Maria · Santa Barbara County | — | — |
| A Tech Painting INC | Myung Chul Shin | — | (213) 272 1256 | Windows, patio, painters | Los Angeles · Los Angeles County | — | — |
| A Tech Plumbing | A Tech Plumbing | — | (310) 484 4999 | Other | Whittier · Los Angeles County | — | — |
| A Tech Roofing INC | Juliana Sunmi Yoo | — | (415) 757 0106 | Other roofers | San Francisco · San Francisco County | — | — |
| A Thru Z Services | Alcaraz Roberto | — | (916) 893 1080 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |