| Level Up Steel INC | Gilbert Christopher Jr Perez | — | (209) 247 6119 | Other | Modesto · Stanislaus County | — | — |
| Levi Sawyer Construction | Levi Josef Sawyer | — | (209) 581 1181 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Lewallen Painting | Lewallen Painting | — | (209) 694 5910 | Windows, patio, painters | Turlock · Stanislaus County | — | — |
| Lewis Rayner | Lewis Rayner | — | (209) 505 3469 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Librado's Hardwood Floors | Librado's Hardwood Floors | — | (408) 849 8527 | Other | Modesto · Stanislaus County | — | — |
| Licea Pro Construction | Jairo Yahir Pedro Licea Arizaga | — | (559) 717 8177 | Other roofers | Ceres · Stanislaus County | — | — |
| Lightning Flash Electric Company INC | Eliseo Zapien | — | (209) 495 8256 | Electricians | Newman · Stanislaus County | — | — |
| Lightronics | Christopher Alan Redding | — | (209) 495 2782 | Electricians | Hickman · Stanislaus County | — | — |
| Lima Construction | Frederick Michael Lima | — | (209) 613 5219 | GC, remodel, ADU | Patterson · Stanislaus County | — | — |
| Linda Mitchell's Painting And Wallpapering | Ralph Leroy Mitchell | — | (925) 383 6666 | Windows, patio, painters | Patterson · Stanislaus County | — | — |
| Lindco INC | Madelynn Kay Kerlee | — | (209) 876 1554 | Other | Hughson · Stanislaus County | — | — |
| Linia LLC | Charles Sumner Hvassman | — | (831) 247 3093 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Lino Toste DBA Toste Plumbing | Lino Toste DBA Toste Plumbing | — | (209) 531 8475 | Other | Ceres · Stanislaus County | — | — |
| Lionel Eco Painting | Lionel Eco Painting | — | (650) 898 5511 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Lionudakis Construction | Raymond Edwin Lionudakis | — | (209) 988 3977 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Liquid Diamond INC | Monica Yurema Barocio | — | (209) 381 8524 | Other | Ceres · Stanislaus County | — | — |
| Liquid Solutions INC | Kyle Sam Cottel | — | (209) 523 5921 | Other | Modesto · Stanislaus County | — | — |
| Lite Work Industry INC | Raymond Cleaon Stoddard | — | (209) 768 0179 | GC, remodel, ADU | Hughson · Stanislaus County | — | — |
| Litt Heating And Air Conditioning | Litt Heating And Air Conditioning | — | (209) 380 3023 | HVAC | Modesto · Stanislaus County | — | — |
| Little's Electrical | Mark Jason Little | — | (209) 505 5932 | Electricians | Empire · Stanislaus County | — | — |
| Livcon Corp | Luis Ivan Villalobos | — | (408) 421 6506 | HVAC | Riverbank · Stanislaus County | — | — |
| Live Oak Landscape | Live Oak Landscape | — | (209) 402 8489 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Lo Forti Custom Framing | Lo Forti Custom Framing | — | (209) 602 1723 | GC, remodel, ADU | Denair · Stanislaus County | — | — |
| Local Hero Home Services | Scott Davis Moorehouse | ryan@groundupwebsites.com | (209) 541 4771 | HVAC | Modesto · Stanislaus County | — | — |
| Loch Construction | Kevin Paden Loch | — | (209) 543 2710 | GC, remodel, ADU | Oakdale · Stanislaus County | — | — |
| Loforti's Roofing INC | Keith Richard Lo Forti | — | (209) 538 2274 | Other roofers | Ceres · Stanislaus County | — | — |
| Logar Builders INC | Jose Eduardo Lopez Ruiz | — | (408) 659 5580 | GC, remodel, ADU | Newman · Stanislaus County | — | — |
| Lolonis Construction | John James Lolonis | — | (209) 484 5111 | GC, remodel, ADU | Turlock · Stanislaus County | — | — |
| Loma Blanca Roofing | Catarino Israel Ramirez-lopez | lomablancaroofing@gmail.com | (209) 604 5348 | Other roofers | Modesto · Stanislaus County | — | — |
| Lone Oak Tree Service INC | Matthew William Hanko | — | (209) 247 6609 | Tree | Oakdale · Stanislaus County | — | — |
| Lone Pine Tree Service | Lone Pine Tree Service | — | (253) 414-3805 | Tree | Valley Springs · Stanislaus County | — | — |
| Lone River Construction | Huizar Alejandro | — | (209) 552 1061 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Long Lasting Builders INC | Hector Javier Gomez Torres | hi@typemade.mx | (650) 271 0083 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| Lopez Concrete Pumping INC | Eduardo Lopez | — | (510) 300 7240 | Windows, patio, painters | Riverbank · Stanislaus County | — | — |
| Lopez Plumbing | Lopez Plumbing | — | (209) 872 1041 | Other | Patterson · Stanislaus County | — | — |
| Lopez Remodeling & Construction | Rafael Corrales Lopez | — | (209) 485 1356 | GC, remodel, ADU | Hughson · Stanislaus County | — | — |
| Lopez Roofing | Guillermo Gudino Lopez | — | (209) 818 7058 | Other roofers | Ceres · Stanislaus County | — | — |
| Lopez Tree Service | Maximina Alicia Villano | — | (209) 312 3668 | Tree | Modesto · Stanislaus County | — | — |
| Lori's Paint | Lori's Paint | info@lorispaint.com | (209) 596 0903 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| Los Vecinos Gutters | Los Vecinos Gutters | — | (909) 287 9391 | Other | Modesto · Stanislaus County | — | — |