| Levitch Associates Incorporated | Maurice Solomon Levitch | — | (510) 845 6941 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Leyva Concrete INC | Alfredo Leyva | — | (510) 282 0075 | Other | San Leandro · Alameda County | — | — |
| Lfcaw | Arthur Joseph Lopez | — | (650) 766 6405 | Other | San Leandro · Alameda County | — | — |
| Lfp Roofing | Luis Fernando Perez | lfproofing@gmail.com | (510) 302 5928 | Other roofers | Oakland · Alameda County | — | — |
| Lgm Electrical INC | Luis Armando Guerrero Medina | — | (510) 993 6980 | Electricians | Hayward · Alameda County | — | — |
| Lhl Construction | Lok-hung| Lok-h Ung Lo Lo | — | (510) 821 9812 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Li's Everyday Refrigeration | Faxiang Li | — | (510) 836 1326 | HVAC | Oakland · Alameda County | — | — |
| Lias Mechanical INC | Alexander Kramer | — | (510) 733 5585 | HVAC | Oakland · Alameda County | — | — |
| Liberta Homes | Liberta Homes | — | (650) 636 5455 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Liberty Building Co | Daniel Edward Wilcox | — | (510) 501 3997 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Liberty Construction | Van Xuan Nguyen | — | (510) 282 2260 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Liberty Electricty Electronics | Liberty Electricty Electronics | — | (707) 297 0457 | Electricians | Oakland · Alameda County | — | — |
| Liberty Floor Covering INC | Jason Randy Pennington | amkryukov@gmail.com | (510) 786 0119 | Other | Hayward · Alameda County | — | — |
| Liberty Painting Services | Kirk Matthew Farnam | — | (925) 577 5886 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Lico's Contracting | Ramirez-lozano Federico | — | (510) 331 5544 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Life Time Painting | Life Time Painting | — | (510) 432 9318 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Lifetime Roofing Service INC | David Lara | — | (510) 228 2541 | Other roofers | San Leandro · Alameda County | — | — |
| Light Frame Construction INC | Aaron Nathaniel Gabourel | — | (510) 715 0025 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Light Hammer Electrical And Building | Shawn Lark Choy | — | (415) 269 9910 | Electricians | Alameda · Alameda County | — | — |
| Lightning And Power Electric | Rodriguez Freddy | — | (510) 944 2386 | Electricians | Oakland · Alameda County | — | — |
| Lijing Li Construction | Li Lijing | — | (510) 913 1102 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Lil Bitty Maintenance Co | Dellyon Donnell Robinson | info@lilbittymaintenance.com | (510) 472 9651 | Electricians | Oakland · Alameda County | — | — |
| Lil Rooter | Lil Rooter | — | (510) 566 1900 | Other | Hayward · Alameda County | — | — |
| Lilja Corp | Matthew Robert Costenbader | — | (925) 455 2300 | Electricians | Livermore · Alameda County | — | — |
| Limon Painting INC | Gerardo Agusto Limon-Angulo | — | (415) 798 1913 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Lin Ligong | Lin Ligong | — | (510) 377 7446 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Lindenmuth Construction | Steve Douglas Lindenmuth | — | (510) 441 8434 | GC, remodel, ADU | Union City · Alameda County | — | — |
| Lio Rooter Company | Adrian Alfaro Ortiz | — | (510) 470 8287 | Other | Oakland · Alameda County | — | — |
| Lion Mark Plumbing INC | Gonzalez Francisco Oregon | — | (510) 517 2072 | Other | Oakland · Alameda County | — | — |
| Lion's Garage Doors And Gates | Lion's Garage Doors And Gates | — | (510) 359 9417 | Other | Hayward · Alameda County | — | — |
| Lions Gate Remodeling & Construction | Aviv David Sapir | — | (310) 721 8022 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Liquid Coating Designs INC | Charles James Suhay | — | (925) 931 1937 | Other | Pleasanton · Alameda County | — | — |
| Lira Plumbing | Lira Plumbing | — | (510) 377 5976 | Other | Oakland · Alameda County | — | — |
| Lithium Home Improvement INC | Alvin Ka Ho | — | (415) 837 8173 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Litvinchuk General Developer | Litvinchuk General Developer | — | (510) 719 9455 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Liu Michael | Liu Michael | — | (510) 773 8766 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Live Oak General Builder INC | Enrique Bruno Castaneda | — | (510) 812 1243 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Livermore Glass Company | Ruth Marilyn Schooler | — | (925) 447 6411 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Livermore Mechanical INC | Mark Joseph Chartier | mark@livermoremechanical.com | (925) 292 1604 | HVAC | Livermore · Alameda County | — | — |
| Living Floors INC | Isai Humberto Batista | — | (510) 290 5412 | Other | San Lorenzo · Alameda County | — | — |