| Alameda Island Heating & Air Conditioning LLC | Sean Schuyler Schaefer | — | (510) 710 5571 | HVAC | Alameda · Alameda County | — | — |
| Alameda Jet Black Tint & Glass | Alameda Jet Black Tint & Glass | — | (888) 385-1504 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Alameda Painting Company INC | Alameda Painting Company INC | — | (909) 357-3551 | Windows, patio, painters | Fontana · Alameda County | — | — |
| Alameda Peak Roofing | Alameda Peak Roofing | — | (510) 990-9108 | Other roofers | Emeryville · Alameda County | — | — |
| Alameda Point Collaborative | Alameda Point Collaborative | — | (510) 749-0301 | Property managers | Alameda · Alameda County | — | — |
| Alameda Roofing And Gutters | Alameda Roofing And Gutters | — | (888) 509-0921 | Other roofers | Alameda · Alameda County | — | — |
| Alameda Roofing Services | Alameda Roofing Services | — | (831) 476-2161 | Other roofers | Watsonville · Alameda County | — | — |
| Alameda Tint N Auto Glass | Alameda Tint N Auto Glass | — | (510) 584-1852 | Windows, patio, painters | Alameda · Alameda County | — | — |
| Alameda Tiny Homes | Henry Kail Hernandez | — | (510) 306 8846 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Alameda Tree Care | Alameda Tree Care | — | (341) 237-7600 | Tree | Alameda · Alameda County | — | — |
| Alameda Tree Service | Alameda Tree Service | info@alameda-tree-service.com | (510) 391-5819 | Tree | Alameda · Alameda County | — | — |
| Alan Electric INC | Alan Joseph Machado | — | (510) 936 4314 | Electricians | Newark · Alameda County | — | — |
| Alaniz Construction INC | Rosy Rosales Alaniz | clientservices@alanizpaving.com | (510) 770 5000 | Other | Fremont · Alameda County | — | — |
| Alaniz HVAC Services | Martinez Marcelo Alaniz | — | (650) 544 6607 | HVAC | Hayward · Alameda County | — | — |
| Alantec Corrosion Control INC | Jerome Richard Hogan | — | (925) 455 4595 | Other | Livermore · Alameda County | — | — |
| Alarcon Bohm Corp | Kevin Jean Sr Bohm | — | (510) 719 7600 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Alarcon Bohm Special Projects | Kevin Jean Sr Bohm | — | (510) 893 4405 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Alaska Refrigeration Air Conditioning & Heating Co | Dagoberto Tique Sanchez | — | (510) 261 9202 | HVAC | Oakland · Alameda County | — | — |
| Alba's Glass INC | Moazeni Behzad | — | (510) 644 2522 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Albert Construction | Li Zhe | — | (650) 245 9787 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Albert Construction INC | Darius Albert West | — | (510) 564 5820 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Albert Nahman Plumbing Heating And Cooling | Michael Lowell Dauenhauer | — | (805) 543 4881 | HVAC | Alameda · Alameda County | — | — |
| Albert Tile & Fine Stone | Albert Tile & Fine Stone | — | (510) 225 8664 | GC, remodel, ADU | Piedmont · Alameda County | — | — |
| Albert W Lenci Construction | Albert William Lenci | — | (510) 226 6034 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Alberto D Valencia | Alberto D Valencia | — | (209) 535 2227 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Alberto H Cosentino | Alberto H Cosentino | — | (408) 318 4291 | Other | Hayward · Alameda County | — | — |
| Alberto's & Sons Custom Glass INC | Luis Alberto Sr Gutierrez Martinez | — | (510) 565 9712 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Albertson Plumbing | Albertson Plumbing | — | (510) 917 2206 | Other | Oakland · Alameda County | — | — |
| Albini Hardwood Flooring | Albini Hardwood Flooring | — | (510) 525 4626 | Other | Albany · Alameda County | — | — |
| Albion Plumbing & Rooter INC | Raymond Theophilus Walters | — | (510) 261 3339 | Other | San Leandro · Alameda County | — | — |
| Alca Siding INC DBA Alca Construction | Flores Carlos Alvarado | — | (510) 719 0929 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Alca-line Construction INC | Alan Rodrigo Laguna Albanez | — | (510) 909 1431 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Alcantar Renewal | Alcantar Renewal | — | (510) 409 9598 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Alcatraz Builders INC | Santos Vicente| Alfaro Santos Vicente Alfaro Palacios | — | (510) 422 8275 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Alcatraz Shade Shop | Leonardo Salas | linds@alcatrazshade.com | (510) 658 2734 | Other | Oakland · Alameda County | — | — |
| Alco Iron & Metal Co | Brian Richard Harvey | — | (510) 562 1107 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Alcon Concrete | Alcon Concrete | asantos@alconconcrete.com | (925) 451 5914 | Other | Dublin · Alameda County | — | — |
| Aldea Quality Construction INC | Miguel Angel Caudillo | — | (510) 557 6974 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Alder And Slate LLC | Alder And Slate LLC | info@alderslate.com | (510) 936 6594 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |
| Alderete's Painting INC | Jesus A Alderete | — | (510) 882 0801 | Windows, patio, painters | San Lorenzo · Alameda County | — | — |