| Locarnini Const | Locarnini Const | — | (408) 422 3779 | GC, remodel, ADU | Morgan Hill · Santa Clara County | — | — |
| Lock & Key World Inc. | Inki Kim | — | (408) 483 4217 | Other | San Jose · Santa Clara County | — | — |
| Lock & Security Systems | Daniel Frias | — | (408) 781 2250 | Alarm and generators | San Jose · Santa Clara County | — | — |
| Lock - Tite Installation | Lock - Tite Installation | — | (408) 438 1023 | Other | Milpitas · Santa Clara County | — | — |
| Locus Environmental INC | Neno Nenad Duplancic | — | (408) 480 4222 | Other | Santa Clara · Santa Clara County | — | — |
| Logic Build INC | Walter Clark Jr Allen | info@logicbuild.com | (408) 375 5987 | GC, remodel, ADU | Morgan Hill · Santa Clara County | — | — |
| Logic Home Development | Liang Sun | — | (650) 797 3999 | GC, remodel, ADU | Los Altos · Santa Clara County | — | — |
| Lombardo Diamond Core Drilling Company Incorporated | Richard Dean Long | — | (408) 727 7922 | Other | Santa Clara · Santa Clara County | — | — |
| Lompoc Masonry | Lompoc Masonry | — | (408) 314 0706 | Other | Sunnyvale · Santa Clara County | — | — |
| Lone Star Landscape INC | Robert Arredondo Samaniego | — | (408) 682 0100 | Windows, patio, painters | San Martin · Santa Clara County | — | — |
| Long Bui Handyman Services Incorporation | Long Bui | — | (408) 705 3354 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Long Ma Construction INC | Paris Shiping Zhao | — | (510) 990 7291 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Long Ngo Tien | Long Ngo Tien | — | (408) 472 0056 | Electricians | Milpitas · Santa Clara County | — | — |
| Longevity Fire Sprinklers LLC | Vladimir Ezequiel Suarez-Halley | — | (669) 208 9329 | Other | San Jose · Santa Clara County | — | — |
| Longteng 4520 | Longteng 4520 | — | (408) 906 9996 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Longteng Construction | Samuel Jackson Chen | — | (669) 455 7558 | GC, remodel, ADU | Milpitas · Santa Clara County | — | — |
| Lopez Brothers Painting INC | Basurto Fredy Lopez | — | (408) 390 3136 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| Lopez Dsn Electric INC | Eladio Lopez | — | (650) 218 0377 | Electricians | East Palo Alto · Santa Clara County | — | — |
| Lopez Landscaping Services LLC | Crisoforo Jose Lopez Fabian | — | (408) 781 7161 | Windows, patio, painters | San Martin · Santa Clara County | — | — |
| Lopez Painting | Lopez Painting | — | (408) 230 0163 | Windows, patio, painters | Santa Clara · Santa Clara County | — | — |
| Lopez Remodeling Construction | Jose Luis Lopez | — | (408) 497 4675 | GC, remodel, ADU | Morgan Hill · Santa Clara County | — | — |
| Lopez's Landscaping LLC | Rivera Pedro Emilio Santos | — | (650) 630 2711 | Windows, patio, painters | East Palo Alto · Santa Clara County | — | — |
| Lord V Construction | Leonardo Velazquez | — | (408) 509 8628 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |
| Lord Velazquez Builder & Plumbing INC | Celestino Cesar Velazquez Rodriguez | — | (650) 464 8678 | GC, remodel, ADU | Palo Alto · Santa Clara County | — | — |
| Lorenzo Heating & Cooling | Max Angel Lorenzo | — | (408) 685 4399 | HVAC | San Jose · Santa Clara County | — | — |
| Lorenzo's Painters INC | Lorenzo Ramirez Ortega | — | (408) 394 7062 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| Loretz Construction INC | Richard Thomas Loretz | — | (650) 533 0936 | GC, remodel, ADU | Los Altos · Santa Clara County | — | — |
| Los Altos Concrete Co | Oscar Daniel Alcala Perez | info@losaltosconcrete.com | (408) 412 1713 | Other | San Jose · Santa Clara County | — | — |
| Los Altos Fence Company | Schroeter Frank | — | (650) 441 4316 | GC, remodel, ADU | Sunnyvale · Santa Clara County | — | — |
| Los Altos Landscape Development | Los Altos Landscape Development | — | (650) 940 1916 | Windows, patio, painters | Los Altos · Santa Clara County | — | — |
| Los Gatos Builders INC | Olga Russinova Jacobs | — | (408) 205 8409 | GC, remodel, ADU | Los Gatos · Santa Clara County | — | — |
| Los Gatos Construction | Charles Edward Jr Hageman | — | (408) 577 7322 | GC, remodel, ADU | Los Gatos · Santa Clara County | — | — |
| Los Gatos Construction INC | David Lewis Pietryga | — | (408) 497 7487 | GC, remodel, ADU | Gilroy · Santa Clara County | — | — |
| Los Gatos Fencing And Deck | Los Gatos Fencing And Deck | — | (408) 460 4909 | Other | Morgan Hill · Santa Clara County | — | — |
| Los Gatos Glass LLC | William Douglas Ferrante | — | (408) 354 1523 | Windows, patio, painters | Los Gatos · Santa Clara County | — | — |
| Los Gatos Home Remodeling | Los Gatos Home Remodeling | — | (408) 203 3881 | GC, remodel, ADU | Morgan Hill · Santa Clara County | — | — |
| Los Gatos Roofing | Los Gatos Roofing | — | (408) 677-2818 | Other roofers | San Jose · Santa Clara County | — | — |
| Los Martillos Garcia | Los Martillos Garcia | — | (669) 263 5525 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| Los Pinos Painting | Los Pinos Painting | — | (408) 772 9968 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| Los Reyes Landscapes LLC | Martin Reyes | — | (408) 466 3275 | Windows, patio, painters | San Jose · Santa Clara County | — | — |