| Logan Construction INC | Scott Bruce Logan | astigma@astigmatic.com | (559) 901 8323 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Loiseau Painting | Loiseau Painting | — | (805) 235 1247 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Loma Development Group | Richard Potter Hill | — | (805) 238 1606 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Lombards Stereo | Lombards Stereo | — | (805) 545-5959 | Alarm and generators | San Luis Obispo · San Luis Obispo County | — | — |
| Lomeli Landscapes INC | Jose Miguel Lomeli | lomelilands@gmail.com | (805) 434 0197 | Windows, patio, painters | Templeton · San Luis Obispo County | — | — |
| Loomis Refrigeration INC | Christian Slone Jowett | — | (805) 466 9864 | HVAC | Atascadero · San Luis Obispo County | — | — |
| Lopez & Son Sealing | Lopez & Son Sealing | — | (805) 481 1062 | Other | Nipomo · San Luis Obispo County | — | — |
| Lopez Family Plumbing INC | Jovanni Lopez | — | (213) 505 3170 | Other | Paso Robles · San Luis Obispo County | — | — |
| Loren Smith Tile | Loren Smith Tile | — | (805) 423 1411 | Other | Creston · San Luis Obispo County | — | — |
| Lorenz Construction | Michael Hugo Lorenz | — | (805) 471 1356 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Lorigo Painting | Lorigo Painting | — | (805) 459 4752 | Windows, patio, painters | Morro Bay · San Luis Obispo County | — | — |
| Los 3 Hermanos Construction Corp | Salvador Tungui Chavez | — | (805) 975 3088 | GC, remodel, ADU | San Miguel · San Luis Obispo County | — | — |
| Los Brothers Innovations General Contractors | Ramiro Josaphat Sanchez Guevara | — | (805) 627 2328 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Los Osos Glass INC | Jack Hayes Rodda | info@losososglass.com | (805) 528 0109 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Los Osos Painting | Los Osos Painting | david@lososospainting.com | (805) 602 7163 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Lost Coast Electric LLC | Chad William Lloyd | — | (805) 423 0099 | Electricians | Morro Bay · San Luis Obispo County | — | — |
| Lost Coast Painting | Lost Coast Painting | — | (805) 801 3499 | Windows, patio, painters | Cayucos · San Luis Obispo County | — | — |
| Louis Earl Schmitz Plumbing Backflow Test And Repair | Louis Earl Schmitz | — | (805) 467 3438 | Other | Paso Robles · San Luis Obispo County | — | — |
| Louis Gibilsco DBA L J G Consulting | L J G Consulting | — | (805) 431 2679 | GC, remodel, ADU | Shell Beach · San Luis Obispo County | — | — |
| Low Voltage Services | David Hiroshi Miyahara | — | (805) 250 3266 | Other | Atascadero · San Luis Obispo County | — | — |
| LP Burnsie Construction | Logan Paul Burns | — | (805) 835 8445 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Lucas Construction | Ryan Alexander Lucas | — | (805) 470 0678 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Luhr Design & Construction INC | Gerald Dean Luhr | — | (805) 440 9537 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Luis A Sanchez Plastering | Luis A Sanchez Plastering | — | (805) 441 5996 | Other | Oceano · San Luis Obispo County | — | — |
| Lukas Construction | Gary John Jr Lukas | — | (805) 391 3139 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Luke Bishop Construction | Luke Joseph Bishop | — | (820) 216 7076 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Luna's Landscaping INC | Torres Hermelindo Villalva | — | (805) 503 9873 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Lyles Water Well Drilling | Joshua Jonathan Lyles | — | (805) 975 3799 | Other | Paso Robles · San Luis Obispo County | — | — |
| Lyman Construction | Paul Everett Lyman | office@lymanconstruction.com | (805) 801 8767 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Lyn Woodward Construction | Lyndall Allen Woodward | — | (805) 714 3457 | GC, remodel, ADU | Shell Beach · San Luis Obispo County | — | — |
| Lynx Low Voltage Solutions LLC | Jeremy Douglas Politte | — | (805) 710 2819 | Other | Atascadero · San Luis Obispo County | — | — |
| M & M Construction | Matthew Russell Mccomb | — | (805) 588 6540 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| M & M Plumbing | M & M Plumbing | — | (559) 675 1282 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| M A C Painting | M A C Painting | miarias@macpainting.com | (805) 550 6514 | Windows, patio, painters | Atascadero · San Luis Obispo County | — | — |
| M And M Builders Group | Marie Catherine Miller | info@mmbuildersgroup.com | (805) 550 6658 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| M B Builders | M B Builders | contactmb@mbbuilders.com | (831) 588 8595 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| M B Concrete | M B Concrete | — | (805) 203 6091 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| M B Piper Construction | Matthew Brett Piper | — | (805) 772 0182 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| M C Etter Painting INC | Mark Clinton Etter | etterpaint@sbcglobal.net | (805) 543 1144 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| M E Avila Construction Corporation | Micheal Ernest Jr Avila | — | (805) 462 1801 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |