| Alarmco Of Modesto | Alarmco Of Modesto | — | (209) 576 0341 | Other | Modesto · Stanislaus County | — | — |
| Alba's Roofing | Alba Gerardo | — | (209) 602 2795 | Other roofers | Modesto · Stanislaus County | — | — |
| Albert Mark Bouley | Albert Mark Bouley | — | (831) 818 7188 | Other | La Grange · Stanislaus County | — | — |
| Albino Custom Construction | Blake Paulucci Albino | — | (209) 996 4545 | GC, remodel, ADU | Waterford · Stanislaus County | — | — |
| Alca Builders | Juan Carlos Jimenez | — | (408) 972 0622 | Electricians | Patterson · Stanislaus County | — | — |
| Alcorcha Electric Company | Ignacio Zamora Alcorcha | — | (208) 548 1920 | Electricians | Modesto · Stanislaus County | — | — |
| Alder Construction | Derek Alan Shuman | — | (209) 524 2075 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Alegacy Concrete Co | Armando Jr Rodriguez | — | (209) 502 0748 | Other | Riverbank · Stanislaus County | — | — |
| Alejandro Arreola Hardwood Floors | Alejandro Arreola Hardwood Floors | — | (408) 835 2337 | Other | Modesto · Stanislaus County | — | — |
| Alfaro Controls | Alfaro Controls | — | (209) 620 2010 | Electricians | Turlock · Stanislaus County | — | — |
| Alkire Construction | Terry Lynn Alkire | — | (209) 531 1666 | HVAC | Ceres · Stanislaus County | — | — |
| All About Fence | All About Fence | — | (209) 809 5792 | Other | Modesto · Stanislaus County | — | — |
| All About Kitchens | James Martin Schilber | — | (209) 521 4490 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| All American Pool Service | Craig Ronald Mc Kinsey | — | (209) 872 1776 | Pool | Modesto · Stanislaus County | — | — |
| All Building | All Building | — | (925) 339 7677 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| All Care Services Heating & Air | Gallegos Hector | — | (209) 252 1168 | HVAC | Turlock · Stanislaus County | — | — |
| All Commercial Fence INC | James Wayne Stamper | — | (209) 845 8400 | Other | Waterford · Stanislaus County | — | — |
| All Custom Painting INC | Daniel Angelo Melgoza | — | (209) 550-9115 | Windows, patio, painters | Keyes · Stanislaus County | — | — |
| All Home Construction | Albert Enrique Gutierrez | — | (209) 595 1901 | GC, remodel, ADU | Newman · Stanislaus County | — | — |
| All In 1 General Contractor | All In 1 General Contractor | — | (209) 649 7621 | GC, remodel, ADU | Ceres · Stanislaus County | — | — |
| All In Electric | Anthony Edwin Ball | — | (209) 985 7492 | Electricians | Modesto · Stanislaus County | — | — |
| All Metal Fabricators INC | Jessie Castellano | — | (209) 634 3200 | Other | Turlock · Stanislaus County | — | — |
| All Nation Garage Doors Company | Christopher Estigoy Canaveral | allnation1135@gmail.com | (209) 900 7821 | Other | Modesto · Stanislaus County | — | — |
| All Points Tree Service INC | Orozco Rafael Sanchez | — | (209) 497 2297 | Tree | Modesto · Stanislaus County | — | — |
| All Pro Repipes INC | Julio Daniel Estrada | — | (408) 332 8571 | Other | Modesto · Stanislaus County | — | — |
| All Pure Pool Service Of Stanislaus County INC | Ronald Borne Schmidt | — | (209) 577 1425 | Pool | Modesto · Stanislaus County | — | — |
| All Roads Paving & Grading | All Roads Paving & Grading | — | (209) 534 2552 | Other | Turlock · Stanislaus County | — | — |
| All Seasons Electric | Robert Harry Williams | — | (209) 324 5310 | Electricians | Modesto · Stanislaus County | — | — |
| All Surface Innovation Granite Tile | All Surface Innovation Granite Tile | — | (209) 988 3135 | Other | Hughson · Stanislaus County | — | — |
| All Valley Landscape INC | Manuel Avina Tovar | — | (209) 537 6679 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| All-phase Masonry INC | Randolph George Schreiber | — | (209) 568 0142 | Other | Modesto · Stanislaus County | — | — |
| Allan Dubbon | Allan Dubbon | — | (209) 988 7770 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Allen Construction | Bill Ray Allen | — | (209) 874 3066 | GC, remodel, ADU | Waterford · Stanislaus County | — | — |
| Allen Electric INC | Chad Matthew Allen | — | (209) 988 6401 | Electricians | Modesto · Stanislaus County | — | — |
| Allen Ford Construction INC | Allen Duane Ford | — | (209) 576 7670 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Alliance | Glen Brian| Osborn Brian Osborn | — | (209) 581 2664 | GC, remodel, ADU | Riverbank · Stanislaus County | — | — |
| Alliance General Engineering INC | Miguel Angel Zaragoza Valencia | — | (209) 648 5541 | Other | Patterson · Stanislaus County | — | — |
| Alliance Home Repair | Alliance Home Repair | — | (209) 606 2668 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Allied Construction Company | Todd Allen James | info@alliedconstruction.com | (209) 497 1104 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Allison Decorating A General Partnership | Douglas James Allison | — | (209) 535 5318 | Windows, patio, painters | Turlock · Stanislaus County | — | — |