| Lalo Electric LLC | Eduardo Medina-Perez | — | (510) 838 5715 | Electricians | Oakland · Alameda County | — | — |
| Lalo's Custom Carpet Service | Eduardo De La Rosa Perez | — | (510) 331 2740 | Other | Hayward · Alameda County | — | — |
| Laloos Construction INC | Adonis Brown Avington | — | (510) 220 6936 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Lam K Nguyen Construction | Lam K Nguyen | — | (408) 389 9887 | HVAC | San Leandro · Alameda County | — | — |
| Lamorinda Deck Care | Lamorinda Deck Care | — | (925) 253 1234 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Lancar Development INC | Nick Paul| Maggi Nickie Paul Maggi | — | (925) 209 1113 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Land Services Landscape Contractors INC | Dean Wesley Ritchie | — | (510) 656 3101 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Landavazo Bros INC | Derrick Paul Landavazo | — | (510) 581 7104 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Landaverry Construction INC | Mariano Israel Landaverry | — | (510) 305 2896 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Landers Drywall INC | Davon Jamal Landers | — | (510) 750 2907 | Other | Oakland · Alameda County | — | — |
| Landforms | Niels Patrick Traynor | — | (510) 229 6487 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Landmark Exteriors | Dennis Leroy Kennerson | landmarkexteriors@yahoo.com | (925) 551 8070 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Landmark Stone Design INC | Wei Luo | — | (510) 484 8888 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Landscape Express | Landscape Express | — | (510) 415 4898 | Windows, patio, painters | Union City · Alameda County | — | — |
| Landscape Images | Landscape Images | — | (510) 491 3843 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Landscaping | Namba Shigeru | — | (510) 526 8935 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Langbo General Construction | Paul Langbo Zheng | — | (415) 518 6903 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Langon Building & Developing | John James Jr Langon | — | (510) 541 0499 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Lanxape INC | Robin Melville White | — | (415) 269 6609 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Lar Landscaping | Lar Landscaping | — | (209) 612 8104 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Lara's Custom Painting INC | Lara Hernandez Ulises | — | (510) 677 7893 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Lara's Custom Woodwork INC | Ramon Lara | — | (510) 792 2720 | Other | Newark · Alameda County | — | — |
| Largusa Finishing & Cabinets | Largusa Finishing & Cabinets | — | (818) 401 8237 | Other | San Leandro · Alameda County | — | — |
| Larocca Inspections Hartley Building | Larocca Inspections Hartley Building | — | (818) 951-1795 | Inspectors | Burbank · Alameda County | — | — |
| Larreta Construction INC | Ruben Perez Larreta | — | (510) 230 8409 | GC, remodel, ADU | Albany · Alameda County | — | — |
| Larrieta Bro's Construction | Erik Dennis Larrieta | — | (707) 775 9191 | Other | Oakland · Alameda County | — | — |
| Larrieta Sanitation Construction | Mejia Rene Larrieta | — | (510) 773 0518 | Other | Oakland · Alameda County | — | — |
| Larry Vigil Custom Hardwood Floors | Larry Vigil Custom Hardwood Floors | — | (510) 856 6134 | Other | San Lorenzo · Alameda County | — | — |
| Larry's Design And Signs | Larry's Design And Signs | — | (510) 706 7628 | Other | Hayward · Alameda County | — | — |
| Las Palmas Landscape Services INC | Erik Morales | — | (925) 858 5628 | Windows, patio, painters | Livermore · Alameda County | — | — |
| Laser & Sons Electric INC | Fidel Lara | — | (510) 300 7489 | Electricians | Fremont · Alameda County | — | — |
| Laser Security Systems INC | Rohn William Reid | — | (925) 245 9019 | Alarm and generators | Livermore · Alameda County | — | — |
| Laserr Electric | Lara Fidel | — | (510) 246 2325 | Electricians | Fremont · Alameda County | — | — |
| Lasting Electric | Benjamin Ocana Sher | ben@lastingelectric.com | (707) 337 5542 | Electricians | Berkeley · Alameda County | — | — |
| Latan Construction | Latic Suad | — | (510) 453 1044 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Lathing Services | Jeffrey Robert Gray Apodaca | — | (510) 226 6616 | Other | Fremont · Alameda County | — | — |
| Latitude 37 Landscape Design | Jose Bernardo Lopez | — | (510) 508 6467 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Lauren Green | Lauren Green | — | (415) 218 7700 | Electricians | Oakland · Alameda County | — | — |
| Lavid Construction Corporation | Ferreira Vinicius Cruz | info@lavidconstruction.com | (650) 274 7247 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Layne Electrical Ent | Layne Lee | — | (650) 771 5001 | Electricians | Castro Valley · Alameda County | — | — |