| Layout Plan Construction Enterprises | Jose Miguel Pollak | — | (925) 808 8642 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Lazar Landscape Design & Construction INC | Pamela Anne Cosce | — | (510) 444 5195 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Lazarit Construction | Vazquez Armando Lazarit | — | (925) 260 0504 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Lazaro Rodriguez Construction | Ocon Rodriguez Lazaro | — | (510) 485 4206 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Lazcano Roofing | Lazcano Vilchis Agustin | lazcanoroofingbayarea@gmail.com | (510) 978 5605 | Other roofers | Oakland · Alameda County | — | — |
| Lb Construction & Remodeling | Liran Biton | — | (510) 213 4564 | Electricians | San Leandro · Alameda County | — | — |
| Lbm Properties | Lbm Properties | — | (707) 292 2002 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Lci Green Construction INC | Leonor Iniguez | — | (510) 914 0927 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Le Construction INC | Jack Van Le | — | (510) 533 7407 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Leader Tree Service | Nuevo De La Luz Rafael | — | (510) 246 4633 | Tree | Hayward · Alameda County | — | — |
| Lee Electric Corp | Brian Palmer Lee | — | (650) 619 3173 | Electricians | San Leandro · Alameda County | — | — |
| Lee Tran Landscaping | Lee Tran Landscaping | — | (510) 378 6419 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Lee's Gardening | Lee's Gardening | — | (510) 207 6920 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Lee's Imperial Welding INC | Gary Joe Lee | — | (510) 657 4900 | Other | Fremont · Alameda County | — | — |
| Lee's Signs INC | Myung Lee | — | (510) 452 1420 | Other | Oakland · Alameda County | — | — |
| Leenac INC | Timothy Joseph Lee | — | (805) 501 3262 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Left Coast Construction | Thomas Michael Black | lcc@leftcoastconstruction.com | (661) 341 7974 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Left Coast Construction | Dax Christian Lay | lcc@leftcoastconstruction.com | (925) 337 5438 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Left Coast Demo | Nicholas Thomas Rasmussen | — | (925) 800 6256 | Other | Dublin · Alameda County | — | — |
| Left Coast Heating And Air Conditioning | Lyle Victor Calley | — | (925) 899 6780 | HVAC | Livermore · Alameda County | — | — |
| Legacy Building & Design LLC | Marvin Mahen Singh | — | (510) 754 9126 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Legacy Construction Partners INC | Fernando Barajas | — | (510) 541 9938 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Legacy Cultured Marble INC | Adalid Cortes | — | (510) 791 1285 | Other | Newark · Alameda County | — | — |
| Legacy INC General Construction | Juan Carlos Godinez | — | (510) 809 5193 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Legacy Painting Contractors INC | David John Baughman | — | (925) 484 4843 | Windows, patio, painters | Pleasanton · Alameda County | — | — |
| Legend Construction LLC | Yu Zhao Xiong | — | (510) 493 8119 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Lei Wen Construction | Wen Lei | — | (408) 509 9700 | Electricians | Union City · Alameda County | — | — |
| Lektricman INC | Kent Bradley Cates | — | (415) 244 1256 | Electricians | Oakland · Alameda County | — | — |
| Lema Construction | Luis Eduardo Moreno | — | (510) 750 6402 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Lema Construction LLC | Luis Enrique Jr Moreno | — | (510) 501 3747 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Lemontree Plumbing | Lin Chia Chun | — | (510) 502 7843 | Other | Berkeley · Alameda County | — | — |
| Lemus Construction INC | Jose Gustavo Lemus | info@lemusconstruction.com | (510) 809 7260 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Lenihan Builders | Lenihan Builders | — | (510) 388 4146 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Leo's Construction | Gonzalez Leonardo | — | (925) 321 2870 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Leon Electric | Leon William Arosteguis-castellon | info@leonelectric.com | (702) 272 7310 | Electricians | Berkeley · Alameda County | — | — |
| Lepe's Home Renovation INC | Julio Cesar Lepe | — | (510) 305 0421 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Let There Be Light | Let There Be Light | — | (510) 326 2795 | Electricians | Oakland · Alameda County | — | — |
| Let's Do Construction LLC | David Thomas Jones | — | (510) 929 6442 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Levante Group INC | Fernando Jimenez Armenta | sample@sample.com | (510) 654 4688 | Electricians | Oakland · Alameda County | — | — |
| Level Five Design INC | Rye Myfanwy Hudak | rye@levelfivedesign.com | (510) 735 9212 | Windows, patio, painters | Oakland · Alameda County | — | — |