| Km Coastal Construction INC | Donald Edward Anderson | — | (805) 825 9941 | GC, remodel, ADU | Oceano · San Luis Obispo County | — | — |
| Km Customs Welding | Km Customs Welding | marcus@kmcustomswelding.com | (885) 602 6672 | Other | Paso Robles · San Luis Obispo County | — | — |
| Kma Masonry INC | Darin Allen Van Deventer | kmamasonry@aol.com | (805) 975 2174 | Other | Paso Robles · San Luis Obispo County | — | — |
| Kml Electric | Kirk Matthew Lutz | — | (510) 376 6353 | Electricians | Shell Beach · San Luis Obispo County | — | — |
| Knecht's Plumbing & Heating INC | Janis Elaine Knecht | — | (805) 544 5118 | HVAC | San Luis Obispo · San Luis Obispo County | — | — |
| Knight And Sons INC | Clay Carter Knight | — | (805) 549 8516 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Knight's Carpets | Gordon Le Roy Knight | — | (805) 237 1400 | Other | Paso Robles · San Luis Obispo County | — | — |
| Knorr Construction | Stephen James Knorr | knorrconstructionllc@gmail.com | (805) 627 2673 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Knox On Wood INC | Robert Kent Knox | — | (406) 261 2602 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Kobalt Builders INC | Thomas James Webster | — | (800) 230 0040 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Kohler Demolition | Kohler Demolition | — | (805) 591 0414 | Other | Paso Robles · San Luis Obispo County | — | — |
| Komada Construction | Michael Joseph Komada | — | (805) 440 7177 | Electricians | Arroyo Grande · San Luis Obispo County | — | — |
| Konczak Construction | Terry L Konczak | — | (805) 235 4422 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Kosanke & Son Const | Kosanke & Son Const | — | (805) 423 3236 | GC, remodel, ADU | Cambria · San Luis Obispo County | — | — |
| Kosharek HVAC | Kosharek HVAC | — | (805) 801 2671 | HVAC | Paso Robles · San Luis Obispo County | — | — |
| Kremco Construction | Ryan Patrick Kremke | — | (805) 458 2446 | Other | Templeton · San Luis Obispo County | — | — |
| Krf Construction INC | Kevin Richard Fuson | — | (805) 674 0528 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Kritz Custom Carpentry | Kritz Custom Carpentry | — | (805) 235 3710 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Kritz Excavating And Trucking INC | Charles Joseph Jr Kritz | — | (805) 239 2686 | Other | Paso Robles · San Luis Obispo County | — | — |
| Krohn Construction | Mason Adam Krohn | — | (805) 235 7308 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| Kruse Construction INC DBA Most Construction | Morten Ehrhorn Kruse | — | (760) 594 6594 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Kubel Construction | Coleen Kaye Kubel | — | (805) 440 2775 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Kuden Construction | David John Kuden | — | (805) 441 1774 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Kudla Enterprises INC | Dianna Justine Kudla | — | (805) 238 6137 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Kurt Taylor Johnson | Kurt Taylor Johnson | — | (559) 403 6727 | Other | Morro Bay · San Luis Obispo County | — | — |
| Kurt Weide Construction INC DBA Kw Construction | Kurt Frederick Weide | — | (805) 835 2229 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Kwik Hardscapes | Kwik Hardscapes | — | (805) 264 1150 | Other | Nipomo · San Luis Obispo County | — | — |
| Kyle Buller Carpentry Service | Kyle Jason Buller | — | (805) 441 6556 | Other | Morro Bay · San Luis Obispo County | — | — |
| Kyle E Cole | Kyle E Cole | — | (805) 234 1495 | Windows, patio, painters | Nipomo · San Luis Obispo County | — | — |
| Kyle E Szumski | Kyle E Szumski | — | (805) 636 7395 | GC, remodel, ADU | Santa Margarita · San Luis Obispo County | — | — |
| L & E Construction | Guadalupe Edward Esquivel | — | (805) 680 4212 | Other | Nipomo · San Luis Obispo County | — | — |
| L & M Landscape | Michael John Zaiser | — | (805) 528 8247 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| L C Brooks Construction | Lane Cameron Brooks | — | (805) 591 9010 | GC, remodel, ADU | Templeton · San Luis Obispo County | — | — |
| L H Construction | Louie Jose Hin | — | (805) 550 3098 | GC, remodel, ADU | Pismo Beach · San Luis Obispo County | — | — |
| L K Graphics INC | Mathew Lee Adams | info@lkgraphics.com | (805) 781 2091 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| L M J Properties | L M J Properties | — | (562) 304 3655 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| L R Painting | L R Painting | — | (805) 806 0058 | Windows, patio, painters | Oceano · San Luis Obispo County | — | — |
| L T Directional Boring | Leo Walter Iii Tidwell | — | (805) 238 4612 | Other | Paso Robles · San Luis Obispo County | — | — |
| L T Roofing | Randall Mark Ingram | — | (805) 471 4877 | Other roofers | Grover Beach · San Luis Obispo County | — | — |
| L V Concrete INC | Luis Alfaro Velazquez | — | (805) 712 6660 | Other | Atascadero · San Luis Obispo County | — | — |