| Ljm Construction INC | Lonnie Jamie Nelson | — | (925) 750 0653 | GC, remodel, ADU | Pleasanton · Alameda County | — | — |
| Ll Construction | Li Lianpeng | — | (408) 674 5175 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Lloyd W Aubry Co INC | Brian David Phillips | — | (510) 732 9038 | Other | Hayward · Alameda County | — | — |
| Lm Construction Company | Douglas Clay Harman | info@lm-construction.com | (510) 712 9011 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Lm Electrical Solutions | Jeronimo Luciano Martin | — | (510) 301 8233 | Electricians | Oakland · Alameda County | — | — |
| Lmm Electric | Javier Ernesto Lopez Madrid | — | (510) 833 8050 | Electricians | San Lorenzo · Alameda County | — | — |
| Loc Tran | Loc Tran | — | (925) 989 1762 | Windows, patio, painters | Pleasanton · Alameda County | — | — |
| Local Construction | Marco Antonio Jaramillo-reyna | — | (415) 757 7413 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Local Construction Team Limited Liability Company | Marco Antonio Jaramillo-Reyna | — | (510) 998 7011 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Locktronix INC | Noah Daniel Salazar | — | (510) 735 4672 | Other | Livermore · Alameda County | — | — |
| Logan's Construction | Larry Kirk Logan | — | (510) 407 0476 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Logistics Engineering And Design INC | James Robert Patillo | — | (510) 505 7800 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Lombera Concrete Construction | Hernandez Diego Lombera | — | (707) 380 9929 | Other | San Lorenzo · Alameda County | — | — |
| Lombera Construction INC | Lombera Ortega Erandy | erandy@lomberaconstruction.com | (510) 978 2312 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Lomu Construction INC | Ofa Finau | — | (510) 899 3363 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Lon's Glass & Mirrors INC | Lonnie Wade Graditi | — | (510) 483 9266 | Windows, patio, painters | San Leandro · Alameda County | — | — |
| Long's Landscaping And Construction | Joseph San Nguyen | — | (510) 697 8415 | Electricians | Oakland · Alameda County | — | — |
| Lonsdale Construction INC | Michael Stephen Lonsdale | — | (510) 303 3005 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Lookfar Builders | Wesley David Bascom | info@lookfarbuilders.com | (802) 274 1420 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Loona Construction INC | Askerov Erkinbek | office@loona-construction.com | (510) 453 0400 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Lopez Electric | Manuel Jesus Lopez-rojas | — | (510) 830 6119 | Electricians | Oakland · Alameda County | — | — |
| Lopez Pools INC | Juan Carlos Lopez | — | (510) 314 1262 | Pool | Newark · Alameda County | — | — |
| Loren Moore Construction INC | Loren Scott Moore | office@lorenmooreconstruction.com | (510) 541 0300 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| Lorenzo Perez Carpentry | Lorenzo Perez Carpentry | loperez.lp6@gmail.com | (510) 552 2350 | Other | Fremont · Alameda County | — | — |
| Loreto Construction Services | Luis Alberto Rodrigues | — | (510) 860 8851 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Los Arcos Landscaping | Rodriguez Julian Hurtado | — | (510) 760 4782 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Los Loza INC | Loza Jorge | — | (510) 520 2657 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Louis John Caravalho | Louis John Caravalho | — | (510) 366 4097 | Other | Hayward · Alameda County | — | — |
| Lourdes Haro | Lourdes Haro | — | (510) 206 1604 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Lovazzano HVAC INC | Gary James Lovazzano | — | (650) 452 6423 | HVAC | Hayward · Alameda County | — | — |
| Lovazzano Sheet Metal INC | Samuel Hernandez | — | (650) 452 6251 | Other | Hayward · Alameda County | — | — |
| Love To Build Homes | Love To Build Homes | info@lovetobuildhomes.com | (650) 906 7676 | GC, remodel, ADU | San Lorenzo · Alameda County | — | — |
| Low Cost Electric | Harper Rex | — | (510) 689 7228 | Electricians | Oakland · Alameda County | — | — |
| Loyalty General Construction | Anwar Mohammad Faizy | — | (510) 598 9269 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Loza & Sons INC | Juan Manuel Loza | — | (510) 351 9700 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Loza Construction INC | Jose De Jesus Loza | — | (510) 714 1444 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Loza H & D The Builders | Loza Hector | — | (510) 887 2259 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Lu's Construction | Keith Harris Ky Tran | — | (510) 754 9346 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Luca's Building | Luca's Building | — | (510) 427 0585 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| Lucas Ilie Construction | Ilie Mihail | — | (510) 712 3847 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |