| Lancon Construction | Fernando Antonio Jurado Lancon | — | (209) 981 7139 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Land Designs | Land Designs | — | (209) 815 3601 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Landbreaker Landscaping | Landbreaker Landscaping | — | (209) 629 0617 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Landmark Construction | Valdez Joseph | — | (209) 321 1388 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Landreth Roofing Co INC | Jeffrey Alan Dwight Szuggar | — | (209) 599 2371 | Other roofers | Ripon · San Joaquin County | — | — |
| Landscape Legends | Landscape Legends | — | (925) 303 9312 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Larios Developing | Francisco Alonso Larios | — | (209) 740 2922 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Larry Braley Const | Larry Braley Const | — | (209) 769 4942 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| Larry Grimes Const | Larry Grimes Const | — | (209) 986 2262 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Larry Wayne Branyan | Larry Wayne Branyan | — | (209) 649 6099 | GC, remodel, ADU | Victor · San Joaquin County | — | — |
| Larry's Backhoe Service | Larry Alan Verke | — | (209) 482 2330 | Other | Tracy · San Joaquin County | — | — |
| Larry's Tree Care INC | Larry Gilbert Kundert | larrykundert@att.net | (209) 518 0981 | Tree | Stockton · San Joaquin County | — | — |
| Larson's Precision Glass | Larson's Precision Glass | — | (650) 575 5980 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Lavandera Construction | Lavandera Hernan | — | (209) 361 0989 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Lawsons Plumbing And Drain Cleaning | Lawsons Plumbing And Drain Cleaning | — | (209) 333 0898 | Other | Lodi · San Joaquin County | — | — |
| Layer 1 Solutions LLC | Michael Jonathon Giannone | — | (916) 224 0957 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Lb Curiel Rack Maintenance INC | Leobardo| Curie L Leobaldo Curiel | — | (510) 590 6099 | Other | Tracy · San Joaquin County | — | — |
| Leading Edge Construction & Design LLC | Jeffrey James Anagnos | — | (209) 663 8543 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Led Construction | Lesvin Haroldo Gonzalez | — | (650) 295 9960 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Lee's Heating And Air Conditioning Co | James Earl Lee | — | (209) 474 6278 | HVAC | Stockton · San Joaquin County | — | — |
| Legacy Construction Specialties INC | Marcus Anthony Gonzalez | — | (916) 416 2882 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Legendary Pool Plastering | Legendary Pool Plastering | — | (209) 400 1709 | Pool | Victor · San Joaquin County | — | — |
| Legendary Pools | Legendary Pools | — | (408) 766-7567 | Pool | San Martin · San Joaquin County | — | — |
| Lemhi Excavation LLC | Gino Adelino Torlai | — | (775) 815 6880 | Other | Clements · San Joaquin County | — | — |
| Lennon Painting And Decorating | Lennon Painting And Decorating | — | (209) 601 0905 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Lenz Construction Company | William Howard Lenz | — | (209) 981 9007 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Lenzi Construction | Clifford Claudio Lenzi | — | (209) 224 5950 | GC, remodel, ADU | Victor · San Joaquin County | — | — |
| Lenzi Incorporated | Lenzi Incorporated | — | (209) 224 5950 | GC, remodel, ADU | Victor · San Joaquin County | — | — |
| Leo's Scaffolding INC | Abarca Gallo Leopoldo | — | (925) 493 1884 | Other | Tracy · San Joaquin County | — | — |
| Leonard Peterson INC | Leonard Harold Peterson | — | (949) 588 0200 | Other roofers | Lockeford · San Joaquin County | — | — |
| Les' Plumbing | Les' Plumbing | — | (209) 872 6723 | Other | Escalon · San Joaquin County | — | — |
| Lesfo Roofing Co | Felix Cordoba Espino | — | (209) 464 3631 | Other roofers | Stockton · San Joaquin County | — | — |
| Leslie Armstrong | Leslie Armstrong | — | (209) 808 6309 | HVAC | Stockton · San Joaquin County | — | — |
| Let's Keep It Real...clean INC | Craig Anthony Fullard | — | (209) 229 1129 | Other | Tracy · San Joaquin County | — | — |
| Level 10 Painting INC | Alvaro U Barba | — | (209) 298 8161 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Lewis Electrical | Michael Dwayne Jr Lewis | — | (909) 533 8725 | Electricians | Manteca · San Joaquin County | — | — |
| Lewis Tile | Lewis Tile | — | (209) 765 8236 | Other | Ripon · San Joaquin County | — | — |
| Leyline Energy Systems | Agustin Gil Cortes | — | (408) 966 4675 | Electricians | Tracy · San Joaquin County | — | — |
| Lfg Innovative Construction INC | Rodrigo De Moises Pena Roldan | — | (408) 780 5422 | GC, remodel, ADU | Lathrop · San Joaquin County | — | — |
| Lgd Remodeling INC | Tian Yue Chen | — | (510) 289 7629 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |