| Advanced Custom Flooring | Advanced Custom Flooring | — | (209) 589 0995 | Other | Turlock · Stanislaus County | — | — |
| Advanced Restoration Solutions | Advanced Restoration Solutions | — | (209) 272 9740 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Advanced Roofing | William Hollowell Carlson | — | (209) 681 6426 | Other roofers | Oakdale · Stanislaus County | — | — |
| Advanced Technology Distributors INC | James Alan Lawson | — | (209) 541 1111 | Other | Ceres · Stanislaus County | — | — |
| Aei | Adrian Alexis Perez | — | (209) 818 1202 | Electricians | Ceres · Stanislaus County | — | — |
| Affordable Custom Painting By T E S | Troy Eugene Slaybaygh | — | (209) 604 7125 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Affordable Hauling | Affordable Hauling | — | (209) 614 2660 | Other | Ceres · Stanislaus County | — | — |
| Affordable Heating & Cooling | Affordable Heating & Cooling | info@affordableheatingcooling.com | (925) 483 0521 | HVAC | Oakdale · Stanislaus County | — | — |
| Ag & Family Drywall INC | Andres De Jesus Mendoza | — | (209) 535 8262 | Other | Denair · Stanislaus County | — | — |
| Ag Construction | Andrew Mario Gregorio | — | (209) 604 2898 | GC, remodel, ADU | Hughson · Stanislaus County | — | — |
| Ag Wire Electric | Axel Vicente Gonzalez-Ruiz | — | (408) 310 2026 | Electricians | Ceres · Stanislaus County | — | — |
| Aggressive Construction & Project Management INC | Mike Shinall | — | (209) 404 9777 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Aggressive Painting Services INC | Edgar Alonzo Avila-Meraz | aggressivepaintingservices@gmail.com | (209) 573 1405 | Windows, patio, painters | Waterford · Stanislaus County | — | — |
| Aggressive Welding Services Incorporated | Jimmie Anthony Chapa | — | (209) 491 2109 | Other | Modesto · Stanislaus County | — | — |
| Aguiar's Landscaping LLC | Edwin Dennis Aguiar | — | (209) 551 5775 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Aguilar Landscape Services INC | Aguilar Rolando | — | (209) 883 0806 | Windows, patio, painters | Hughson · Stanislaus County | — | — |
| Aguilar Roofing | Robert Hyatt Aguilar | — | (209) 892 6524 | Other roofers | Patterson · Stanislaus County | — | — |
| Ahrenholtz Masonry | Mark Allen Ahrenholtz | — | (209) 522 7116 | Other | Modesto · Stanislaus County | — | — |
| Air Experts Heating & Air | Air Experts Heating & Air | — | (209) 602 9721 | HVAC | Riverbank · Stanislaus County | — | — |
| Air Heroes | Kimberly Jean Bailey | — | (209) 527 4066 | HVAC | Modesto · Stanislaus County | — | — |
| Air Kustoms INC | Juan Jr Zarate | — | (209) 614 8252 | HVAC | Patterson · Stanislaus County | — | — |
| Air Star Heating & Air Conditioning & Construction | Garcia Reginaldo | — | (209) 968 9388 | HVAC | Oakdale · Stanislaus County | — | — |
| Air Systems | Air Systems | — | (209) 652 0399 | HVAC | Ceres · Stanislaus County | — | — |
| Air Tech Services INC | Larry Joe Jr Gwartney | — | (209) 551 4444 | HVAC | Modesto · Stanislaus County | — | — |
| Air Techs Mechanical INC | Walid Ahmed Mashrah | — | (510) 927 6675 | HVAC | Patterson · Stanislaus County | — | — |
| Air Zone HVAC INC | Jimenez Alejandro | — | (209) 996 8160 | HVAC | Modesto · Stanislaus County | — | — |
| Airgentix LLC | Wary San | — | (209) 778 7847 | HVAC | Turlock · Stanislaus County | — | — |
| Airmergency INC | Jaymon Douglas Jordan | airmergencyllc@gmail.com | (209) 498 9444 | HVAC | Modesto · Stanislaus County | — | — |
| Airpossible Heating And Air | Airpossible Heating And Air | — | (209) 573 3159 | HVAC | Patterson · Stanislaus County | — | — |
| Airrows Heating And Air LLC | Brett Jacob Houser | — | (678) 997 5010 | HVAC | Modesto · Stanislaus County | — | — |
| Aivaz Electric | Aivaz Jordan | — | (209) 678 7939 | Electricians | Turlock · Stanislaus County | — | — |
| Aj's Anguiano Builder | Aj's Anguiano Builder | — | (209) 981 5801 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| Ajax Heating And Air Conditioning | Ajax Heating And Air Conditioning | — | (209) 360 5270 | HVAC | Modesto · Stanislaus County | — | — |
| Ajm Framing INC | Jaime Jr Arreola | — | (209) 570 4939 | Other | Modesto · Stanislaus County | — | — |
| Akal Buildtech INC | Pritpal Singh Grewal | — | (209) 765 0015 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| Akriveia General Engineering | Israel Saul Chavez Vazquez | — | (209) 996 9739 | Other | Modesto · Stanislaus County | — | — |
| Al Construction | Jose Arturo Luna | — | (408) 649 8576 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Al's Certified Safe & Lock | Al's Certified Safe & Lock | — | (209) 524 9181 | Electricians | Salida · Stanislaus County | — | — |
| Alameda Construction | Dwayne David Alameda | — | (209) 667 4864 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Alan Patrick | Alan Patrick | — | (209) 847 3273 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |