| Arista's Fencing INC | Marcos Antonio Arista Rocha | — | (209) 568 3437 | Other | Modesto · Stanislaus County | — | — |
| Arlu Construction | Aragon Gustavo | — | (209) 614 1978 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Armando's Cabinets | Armando's Cabinets | armandocabinets@gmail.com | (209) 988 0607 | Other | Modesto · Stanislaus County | — | — |
| Armando's Painting Service | Hernandez Armando | — | (209) 538 3133 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| Armor Roofing | John Stephen Jewell | office@armorroofing.net | (209) 525 9773 | Other roofers | Modesto · Stanislaus County | — | — |
| Armored Air | Armored Air | — | (209) 281 4100 | HVAC | Modesto · Stanislaus County | — | — |
| Armstrong Development | Armstrong Development | — | (209) 204 0874 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Armstrong Refrigeration | Armstrong Refrigeration | — | (209) 518 0208 | HVAC | Turlock · Stanislaus County | — | — |
| Aro And Sons DBA Kitchen And Bath Direct | Robert Lee Stitt | — | (209) 847 1111 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Arrcon Builders INC | Trevor Dean Arrighi | — | (209) 665 1909 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Arriola Concrete | Arriola Concrete | — | (209) 857 1732 | Other | Modesto · Stanislaus County | — | — |
| Arrow Floor Covering INC | Karen Anne Strickler | — | (209) 632 5408 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Arroyo Quality Roofing INC | Pineda Pedro Arroyo | — | (408) 420 7793 | Other roofers | Modesto · Stanislaus County | — | — |
| Art Framing LLC | Juan Jose Munoz | — | (209) 589 4242 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Artcad Builders INC | Arias Reyes Artemio | info@artcadbuilders.com | (510) 573 1880 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Artemio Duarte HVAC | Artemio Duarte HVAC | — | (650) 248 4515 | HVAC | Modesto · Stanislaus County | — | — |
| Arthur P Lamarre & Sons INC | Arthur Paul Jr Lamarre | — | (209) 667 6557 | Other | Turlock · Stanislaus County | — | — |
| Artificial Turf And Landscaping Co INC | Daniel Joseph Keane | — | (209) 604 8282 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Artistic Drywall & Construction INC | Luis Alberto Gallardo | — | (209) 818 9300 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Artistic Edge | Artistic Edge | — | (209) 579 7020 | Other | Modesto · Stanislaus County | — | — |
| Artistico Marble Tile | Artistico Marble Tile | — | (209) 489 5335 | Other | Modesto · Stanislaus County | — | — |
| Arv Construction INC | Luis Alberto Vazquez Medina | — | (209) 535 4879 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| Ashcraft Const | Ashcraft Const | — | (209) 649 2789 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Ashur Construction Gc | Samir Farnsa Sawa | — | (209) 630 1615 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Asw INC | Mark Anthony Perez | — | (209) 495 9422 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Atlantis Heating LLC | Theodore Ross Prepoutse | — | (209) 996 2848 | HVAC | Modesto · Stanislaus County | — | — |
| Atlas Drywall Corporation | Navarro Simon Ruvalcaba | — | (209) 894 5579 | Other | Patterson · Stanislaus County | — | — |
| Attinderpal Singh Dhanoa | Attinderpal Singh Dhanoa | — | (650) 888 1321 | Other | Modesto · Stanislaus County | — | — |
| Attunedcommtech | William Kevin Phelps | info@attunedcommtech.com | (209) 857 1918 | Other | Modesto · Stanislaus County | — | — |
| Augusta Lawn Care Of Tracy | Augusta Lawn Care Of Tracy | — | (209) 424 5784 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Automated Equipment | Automated Equipment | — | (209) 602 7313 | Electricians | Turlock · Stanislaus County | — | — |
| Automatic Gate Operations | Automatic Gate Operations | — | (209) 424 3002 | Other | Ceres · Stanislaus County | — | — |
| Autrey's Water Truck & Sweeper Service | Gary Lee Autrey | — | (209) 607 5928 | Other | Riverbank · Stanislaus County | — | — |
| Avalos Enterprises INC | Michael Paul Avalos | — | (209) 534 4659 | Other | Turlock · Stanislaus County | — | — |
| Axel Construction | Martinez Ramon Lopez | — | (209) 614 0054 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| Azaryans Construction | Azaryans Eishkhan | — | (209) 202 2012 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Azevedo Concrete | Albert Anthony Azevedo | — | (209) 484 3984 | Other | Turlock · Stanislaus County | — | — |
| B & C Construction Group | Juan Antonio Cardenas Olivera | — | (209) 846 4228 | GC, remodel, ADU | Salida · Stanislaus County | — | — |
| B & R Concrete | B & R Concrete | — | (209) 535 2733 | Other | Waterford · Stanislaus County | — | — |
| B And B Painting | B And B Painting | — | (209) 499 6866 | Windows, patio, painters | Modesto · Stanislaus County | — | — |