| Art Garden Design | Alana Kai Corpuz | — | (510) 424 2503 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Art Line Construction | Magdy Makram Pasca Rofail | — | (510) 890 1818 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Art Monument Co INC | David Paul Mc Lennan | — | (510) 581 1206 | Other | Hayward · Alameda County | — | — |
| Art Of Building Architecture Construction Management INC | Saul Jr Pichardo | — | (510) 385 6820 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Art Of Comfort | David Atour Ghahramany | forms@artofcomfort.com | (925) 291-0871 | HVAC | Pleasanton · Alameda County | — | — |
| Art Of Turf INC | Hector Ottoniel Salguero | — | (510) 815 3691 | Other | Castro Valley · Alameda County | — | — |
| Art Potts DBA A & J Doors | A & J Doors | — | (925) 449 7080 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Art Thou Graphics | Art Thou Graphics | — | (510) 525 7779 | Other | Berkeley · Alameda County | — | — |
| Art's Bldg | Art's Bldg | — | (341) 333 2900 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Arteaga Construction | Francisco Javier Arteaga | arteagaconstruction@pm.me | (510) 358 9763 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Arthaus Properties | Arthaus Properties | info@arthaus.mov | (510) 591-4088 | Property managers | Oakland · Alameda County | — | — |
| Arthur Guarascio Painting | Arthur Guarascio Painting | — | (831) 601 0099 | Windows, patio, painters | Pleasanton · Alameda County | — | — |
| Articulate Designed Tile | Articulate Designed Tile | — | (650) 270 5918 | Other | Hayward · Alameda County | — | — |
| Artifex Construction INC | Michael Lee Miller | — | (510) 292 5961 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Artisan Air Heating Cooling INC | Cody Randle Cusick | — | (510) 557 9889 | HVAC | Hayward · Alameda County | — | — |
| Artisan Building And Construction | Francis Martin Irwin | — | (510) 847 5231 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Artisan Finishes | Artisan Finishes | — | (510) 388 8676 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Artisan Signature Floors INC | Alberto Tapia-Tellez | — | (510) 506 9377 | Other | Union City · Alameda County | — | — |
| Artisan Wood Floors INC | Daniel Alejandro Acosta-marquez | — | (650) 576 3421 | Other | San Leandro · Alameda County | — | — |
| Artistic Edge Stair Company | Gregory Blain Adams | — | (510) 952 1478 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Artistic Geometry INC | Alessandro Baldo | info@artisticgeometry.com | (510) 969 4943 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Artistic Shower Door Glass Railings | Alejandro Zarate | — | (510) 571 6110 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Artistic Stone Kitchen & Bath INC | Jiang Yang | — | (510) 483 1298 | Other | San Leandro · Alameda County | — | — |
| Artistic Wine Cellars | Robert Michael Harmon | — | (415) 492 1450 | Other | Alameda · Alameda County | — | — |
| Arto Construction INC | Arto| Yagcioglu Harutyun Art Yagjian | — | (510) 331 0779 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Arts & Security Locksmith INC | Douglas Robert Simens | — | (925) 443 5166 | Alarm and generators | Livermore · Alameda County | — | — |
| Artstone Creations General Builder | Artstone Creations General Builder | — | (510) 925 8582 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Artthaus Construction INC | Michael Webster Ingram | — | (310) 752 3024 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| As Good As Gold Landscaping | As Good As Gold Landscaping | — | (415) 420 5831 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Asap Heating And Air LLC | Gary John Lee | — | (510) 357 7787 | HVAC | San Leandro · Alameda County | — | — |
| Asap Rodent & Remodeling Solutions | Shlomi Ohana | — | (415) 606 3754 | HVAC | Oakland · Alameda County | — | — |
| Ascencio Construction | Jose Luis Ascencio | — | (510) 325 0219 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ascend Electric INC | Luke Benjamin Johnson | — | (925) 518 8943 | Electricians | Pleasanton · Alameda County | — | — |
| Asfa Home Improvements | Asfa Home Improvements | — | (510) 692 3729 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Ashley Interiors INC | John Robert Jr Ashley | — | (510) 793 7470 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Ashtonco LLC | David Robert Ashton | info@ashtonco.com | (510) 773 0622 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Assembly Builders INC | David Keith Libby | — | (510) 910 5973 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Asset Construction INC | Thomas Schuyler Anthony | — | (510) 701 3700 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Assist Tel - Com INC | William Pratt Miller | wmiller@assisttelcom.com | (925) 931 4610 | Other | Pleasanton · Alameda County | — | — |
| Associate Building Maintenance Co | Jong Kun Kim | — | (408) 680 3777 | GC, remodel, ADU | Fremont · Alameda County | — | — |