| Left Coast Electric | Conor Cruise Provan | — | (805) 680 7393 | Electricians | Goleta · Santa Barbara County | — | — |
| Legacy Construction & Management INC | Michael Dean Farage | — | (805) 310 0528 | GC, remodel, ADU | Santa Maria · Santa Barbara County | — | — |
| Legacy Home Roofing Of Santa Barbara | Jeremy Austin Burrey | — | (805) 722 9466 | Other roofers | Santa Barbara · Santa Barbara County | — | — |
| Legacy Landscape & Arboriculture INC | Stanford Kenneth Nash | — | (805) 325 0794 | Windows, patio, painters | Los Alamos · Santa Barbara County | — | — |
| Lemon Tree Management | Lemon Tree Management | — | (805) 722-2531 | Property managers | Santa Barbara · Santa Barbara County | — | — |
| Lenard Shepard Jr | Lenard Shepard Jr | — | (805) 588 3401 | GC, remodel, ADU | Lompoc · Santa Barbara County | — | — |
| Lenz Pest Control | Lenz Pest Control | — | (805) 456-0375 | Pest, tile roofs | Santa Barbara · Santa Barbara County | — | — |
| Leo Carranza | Leo Carranza | — | (805) 710 1869 | Other | Santa Maria · Santa Barbara County | — | — |
| Leon Rm Construction | Rafael Demetrio Hernandez Gomez | — | (805) 903 2124 | GC, remodel, ADU | Santa Maria · Santa Barbara County | — | — |
| Leonard Unander Associates INC | Leonard Edwin Unander | — | (805) 682 5685 | GC, remodel, ADU | Santa Barbara · Santa Barbara County | — | — |
| Les' Tree Care INC | Leslie James Ames | — | (805) 693 1843 | Tree | Santa Barbara · Santa Barbara County | — | — |
| Level Up General Construction INC | Philip Stephen Naidenoff | — | (805) 284 2917 | GC, remodel, ADU | Santa Ynez · Santa Barbara County | — | — |
| Levelex | Peter Allen Miko | — | (805) 698 6668 | GC, remodel, ADU | Santa Barbara · Santa Barbara County | — | — |
| Lewis Plumbing INC | Martin Frank Morales | — | (805) 569 1060 | Other | Santa Barbara · Santa Barbara County | — | — |
| Lewis R Johnson | Lewis R Johnson | — | (805) 245 8651 | Electricians | Solvang · Santa Barbara County | — | — |
| Lg General Construction | Jose Luis Guillen | — | (805) 345 9188 | GC, remodel, ADU | Santa Maria · Santa Barbara County | — | — |
| Lifesource Project INC | Ramsey Charles Cronk | — | (805) 462 7656 | Windows, patio, painters | Santa Barbara · Santa Barbara County | — | — |
| Lifguist Construction | Michael Edward Lifquist | — | (805) 204 1414 | GC, remodel, ADU | Santa Barbara · Santa Barbara County | — | — |
| Light Master | Light Master | — | (805) 325 8716 | Other | Santa Barbara · Santa Barbara County | — | — |
| Light Of This World Electric Corp | Erik Steven Roberts | — | (805) 796 6225 | Electricians | Goleta · Santa Barbara County | — | — |
| Lighthouse Fence Company Corporation | Kevin Michael Herlihy | — | (805) 203 6165 | Other | Santa Barbara · Santa Barbara County | — | — |
| Lima Construction | Lima Melvin | — | (805) 455 4454 | GC, remodel, ADU | Santa Barbara · Santa Barbara County | — | — |
| Linden Shimizu Construction | Linden Neil Shimizu | — | (805) 331 7424 | GC, remodel, ADU | Santa Maria · Santa Barbara County | — | — |
| Lindsey Adams Construction INC | Lindsey Stoughton Adams | — | (805) 966 7001 | GC, remodel, ADU | Summerland · Santa Barbara County | — | — |
| Lionello Electric | Michael Lee Lionello | — | (805) 570 1587 | Electricians | Carpinteria · Santa Barbara County | — | — |
| Litchfield Builders | Litchfield Stephen | — | (805) 729 2357 | GC, remodel, ADU | Montecito · Santa Barbara County | — | — |
| Litle Backhoe Services | Craig Garrett Litle | — | (805) 325 1110 | Other | Santa Ynez · Santa Barbara County | — | — |
| Lizard Roofing | Santos Ramirez Efrain | — | (805) 714 8924 | Other roofers | Santa Maria · Santa Barbara County | — | — |
| Lmi Electric | Lucas Michael Iorio | — | (805) 452 7996 | Electricians | Santa Ynez · Santa Barbara County | — | — |
| Lobito's Construction | Escalera Manuel | — | (805) 448 3502 | GC, remodel, ADU | Santa Maria · Santa Barbara County | — | — |
| Local Trusted Electricians | Local Trusted Electricians | — | (805) 222-7117 | Electricians | Santa Barbara · Santa Barbara County | — | — |
| Lockwood Construction INC | Alan John Lockwood | — | (805) 729 0169 | GC, remodel, ADU | Solvang · Santa Barbara County | — | — |
| Lockwood Electric | Tanner William Lockwood | — | (805) 245 7088 | Electricians | Los Olivos · Santa Barbara County | — | — |
| Logan Electric | Logan Neil Pfefferle | — | (805) 252 9494 | Electricians | Santa Barbara · Santa Barbara County | — | — |
| Logos Painting | Logos Painting | — | (805) 315 7072 | Windows, patio, painters | Lompoc · Santa Barbara County | — | — |
| Loma Linda Landscaping | Loma Linda Landscaping | — | (805) 798 4533 | Windows, patio, painters | Santa Barbara · Santa Barbara County | — | — |
| Lomeli Electric INC | Lomeli Eric | — | (805) 268 1641 | Electricians | Santa Maria · Santa Barbara County | — | — |
| Lone Star Wireless | Lone Star Wireless | — | (805) 688 6282 | GC, remodel, ADU | Solvang · Santa Barbara County | — | — |
| Longevity Plumbing Services | Long Javet | — | (805) 550 2211 | Other | Lompoc · Santa Barbara County | — | — |
| Loop-scapes Fbn | Loop-scapes Fbn | — | (303) 990 4938 | Windows, patio, painters | Santa Barbara · Santa Barbara County | — | — |