| Arca Design Group INC | Suzanne Jeanne Arca | — | (510) 558 0636 | Windows, patio, painters | Albany · Alameda County | — | — |
| Arch Roofing INC | Alfred Galvez Hernandez | — | (855) 969 2724 | Other roofers | Fremont · Alameda County | — | — |
| Architectural Glass & Aluminum Co INC | Jeffrey Joseph Scalisi | — | (510) 444 6100 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Architectural Metalsmiths | Architectural Metalsmiths | — | (510) 318 4664 | Other | Oakland · Alameda County | — | — |
| Archon General Contracting INC | Louis Liu | — | (510) 386 4377 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Archvista LLC | Li Peize | — | (650) 504 0799 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Arco / Murray National Norcal LLC | Jason Peter Mc Laughlin | — | (650) 288 1305 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Ardell-smith & Associates INC | Zachary Ardell-Smith | — | (510) 219 5848 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Ardenbrook INC | William Mathews Brooks | leasing@ardenbrook.com | (510) 797 7980 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Ardent Construction | Tomy Henry Prince | — | (510) 735 1981 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Area Plumbing | Area Plumbing | — | (408) 707 5627 | GC, remodel, ADU | Dublin · Alameda County | — | — |
| Arechiga Power | Raymundo Arechiga | info@arechigapower.com | (510) 355 7392 | Electricians | Oakland · Alameda County | — | — |
| Arflor Construction INC | David Ernesto Argueta Flores | — | (510) 586 3601 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Ariana Builders INC | Mustafa Zargaran | info@arianabuilders.com | (510) 316 4153 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Aris Painting And Decorating | Aris Painting And Decorating | — | (510) 685 1152 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| Arisen Construction INC | Nghiem Thuan Le | — | (510) 838 6009 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Arista Exteriors | Brian Westley Todd | info@aristaexteriors.com | (415) 515 5556 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Arista Painting | Arista Painting | — | (408) 903 5802 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Ark Design Build | Ark Design Build | — | (510) 590 6388 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Arkenstone | Gavrieli Moshe | info@arkenstone.com | (510) 872 9872 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Armada Painting & Decorating | Armada Painting & Decorating | — | (510) 798 6670 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Armando Floors | Armando Floors | — | (510) 390 1583 | Other | Oakland · Alameda County | — | — |
| Armaz Electric A Partnership | Andres Armand Armaz | — | (510) 579 5552 | Electricians | Fremont · Alameda County | — | — |
| Armer/norman & Associates INC | Kelsey Brianne Cochran | — | (925) 671 9200 | Electricians | San Leandro · Alameda County | — | — |
| Armin Sharafi | Armin Sharafi | — | (650) 241 9190 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Armstrong Painting Roofing & Windows | Arthur Jerry Levine | — | (510) 777 1234 | Other roofers | Emeryville · Alameda County | — | — |
| Armtrout's Custom Roofing | Joe Allen Armtrout | — | (925) 455 8221 | Other roofers | Livermore · Alameda County | — | — |
| Arnoldo General Contractor | Arnoldo General Contractor | — | (510) 736 8818 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Arr'e Insulation Services | Luis Alberto Del Rio Garcia | — | (510) 890 8010 | Other | San Leandro · Alameda County | — | — |
| Arrebak Construction | William Martin Rogan | — | (510) 435 2952 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Arreola Glazing LLC | Arreola-gonzalez Pedro | — | (510) 379 6538 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Arrizon Co | Antonio Arrizon | — | (510) 708 7294 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Arrlux INC | Chaohui Hu | — | (650) 868 2193 | HVAC | Pleasanton · Alameda County | — | — |
| Arrow Acoustics INC | Susan Paige Dodemaide | — | (510) 783 4900 | Other | Hayward · Alameda County | — | — |
| Arrow Building Company | Mackillop Gabriel | — | (415) 519 0110 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Arrow Glass Co | Gary William Grimshaw | — | (510) 525 2118 | Windows, patio, painters | Albany · Alameda County | — | — |
| Arrow Max Compressor & Pumps | Arrow Max Compressor & Pumps | — | (510) 828 7555 | Other | Fremont · Alameda County | — | — |
| Arrow Sign Co | Charles Frank Sterne | — | (510) 533 7693 | Other | Oakland · Alameda County | — | — |
| Arroyo Plumbing & Rooter INC | William Gerardo Caceres | — | (510) 301 7068 | Other | Oakland · Alameda County | — | — |
| Art Garcia Concrete Construction INC | Garcia Arthur | — | (925) 484 5450 | Other | Pleasanton · Alameda County | — | — |