| L Young Construction | Darrell Leon Jr Young | — | (805) 704 3656 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| La Firma INC | Vicente Chavez Bravo | — | (805) 748 8576 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Lafferty Heating | Jeremy Andrew Calvin | laffertyheating@sbcglobal.net | (805) 927 4487 | HVAC | Cambria · San Luis Obispo County | — | — |
| Lakeside Electric LLC | Michael Gonzalez | — | (805) 975 9252 | Electricians | Paso Robles · San Luis Obispo County | — | — |
| Lakeside Industries | Lakeside Industries | — | (805) 316 5170 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Lambert's Pool And Spa Service | David Seth Lambert | — | (805) 801 3666 | Pool | Paso Robles · San Luis Obispo County | — | — |
| Lampman Architecture & Construction | Gregory Brian Lampman | — | (805) 550 5838 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Land/sea Interface | Land/sea Interface | — | (805) 772 8436 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Landrith & Company | Dane Michael Landrith | — | (805) 792 0059 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Landscape Gardening U S A INC | Kathy Lynn Garcia | — | (805) 238 5331 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Landscape Solutions | Landscape Solutions | — | (805) 598 5130 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Landwell Landscape Construction | Jonathan Taylor Svehla | — | (805) 439 3747 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Lane Masonry | Lane Masonry | — | (805) 440 0370 | Other | Paso Robles · San Luis Obispo County | — | — |
| Langford Building & Construction | Gavin Wayne Langford-baillie | — | (805) 305 2516 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Lansky Construction | Cortney Alan Lansky | — | (805) 340 1401 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Lariat Construction | Evan Gregory Weisberg | evan@lariat-construction.com | (805) 602 6255 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Larry Cusick Landscape | Larry Cusick Landscape | — | (805) 544 6697 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Larry Nash Construction | Larry Steven Nash | — | (805) 295 1931 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Larry Phillips Construction | Larry Neville Phillips | — | (805) 466 5428 | Electricians | Atascadero · San Luis Obispo County | — | — |
| Larry S Everett DBA Everett Enterprises | Larry Steven Everett | — | (805) 550 2459 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Lattis Networks Corporation | Theodore Allen Dronen | heylattis@lattisnetworks.com | (805) 434 1020 | Other | Atascadero · San Luis Obispo County | — | — |
| Lavelle Construction | Robert Paul Lavelle | — | (805) 748 4457 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Lavorgna Construction | Vincent Francis Lavorgna | — | (805) 570 5107 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Lawrence Construction | Jeffery Robert Lawrence | info@lawrence-construction.com | (805) 431 2867 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Lawrence Hahn Construction | Lawrence Burton Ii Hahn | — | (805) 710 6864 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Lawrence W Dirk | Lawrence W Dirk | — | (818) 426 3369 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Lazaro Lee Villa | Lazaro Lee Villa | — | (559) 805 0128 | Electricians | Avila Beach · San Luis Obispo County | — | — |
| Lbm Property Solutions INC | Seth Michael Leigan | — | (805) 610 6999 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Lci Welding | Lci Welding | lciwelding@protonmail.com | (805) 806 2000 | Other | Paso Robles · San Luis Obispo County | — | — |
| Ld Construction | Lorney Wayne Davis | info@ldconstruction.com | (805) 391 3369 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Learner Harrison_engineering | Learner Harrison_engineering | — | (805) 610 4840 | Other | San Miguel · San Luis Obispo County | — | — |
| Leave It To Weaver Construction | Joey Dee Weaver | — | (805) 574 5821 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Lee Wilson Electric Company INC | Kalli Jean Wilson | — | (805) 489 4216 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Legacy Builders & Design INC | Jonathon Spencer Whitener | — | (805) 464 6105 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Legacy Built INC | Justin Marion Sorrentino | bill@bjstrophy.com | (805) 712 2605 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Legacy Construction | Christopher Curtis Garland | — | (805) 314 7625 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Legacy Custom Construction LLC | Griffin Aleksandr Brooks | — | (805) 903 2213 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Legendary Cabinets INC | Vera Argimiro Navarrete | — | (805) 619 7470 | Other | Nipomo · San Luis Obispo County | — | — |
| Leland Ayer Floor Covering | Leland Ayer Floor Covering | — | (805) 441 8137 | Other | Paso Robles · San Luis Obispo County | — | — |
| Lenhart Fire Protection | Lenhart Fire Protection | — | (805) 748 7785 | Other | Atascadero · San Luis Obispo County | — | — |