| Ksenzulak Painting | Ksenzulak Painting | — | (530) 604 9688 | Windows, patio, painters | Redding · Shasta County | — | — |
| Kurt Zimmerman Construction | Kurt Dwayne Zimmerman | — | (530) 474 1861 | GC, remodel, ADU | Shingletown · Shasta County | — | — |
| L M N T Painting | L M N T Painting | lmntpainting41@gmail.com | (530) 276 1613 | Windows, patio, painters | Redding · Shasta County | — | — |
| L V Granite & Tile | L V Granite & Tile | — | (530) 209 5301 | Other | Redding · Shasta County | — | — |
| Lahr Construction | Bryan Scott Lahr | — | (530) 941 4557 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| Landmark Landscapes | Landmark Landscapes | — | (408) 691 2075 | Windows, patio, painters | Shingletown · Shasta County | — | — |
| Landscape Design / Construction INC | James Le Roy Waters | — | (530) 246 3227 | Windows, patio, painters | Redding · Shasta County | — | — |
| Lanes Builders INC | Melissa Lynn Jones | — | (530) 949 0503 | HVAC | Burney · Shasta County | — | — |
| Larry's Lighting & Electric | Laurence Stephen Adams | — | (530) 244 3202 | Electricians | Redding · Shasta County | — | — |
| Lassen Air And Refrigeration Services | Nicholas Adam Salmans | — | (530) 917 9671 | HVAC | Shingletown · Shasta County | — | — |
| Lassen Design Scape INC | Perez Ernesto Garcia | — | (530) 440 1776 | Windows, patio, painters | Anderson · Shasta County | — | — |
| Lassen Electrical Services INC | Steven Joseph Iii Pick | — | (530) 209 3989 | Electricians | Shasta Lake · Shasta County | — | — |
| Lauer Electric | Lauer Electric | u003eoffice@lauerelectric.net | (530) 918-8158 | Electricians | Mt Shasta · Shasta County | — | — |
| Laughlin Construction | Elmer Leigh Laughlin | interested@domainmarket.com | (530) 335 4706 | GC, remodel, ADU | Burney · Shasta County | — | — |
| Laustalot Construction INC | Thomas Cole Laustalot | — | (530) 549 5768 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Lava Concrete | Lava Concrete | pschwam@gmail.com | (808) 217 6888 | Other | Millville · Shasta County | — | — |
| Lawler Construction | Nathan Joseph Lawler | — | (530) 941 0289 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Lawn Care Perfection | Lawn Care Perfection | — | (530) 200 1517 | Windows, patio, painters | Cottonwood · Shasta County | — | — |
| Lawrence Dale Ovian | Lawrence Dale Ovian | — | (530) 410 3425 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Ldhi Construction INC | Louis Richard Decker | — | (530) 949 0333 | GC, remodel, ADU | Millville · Shasta County | — | — |
| Leckey Land Clearing | Troy Michael Leckey | — | (530) 246 7699 | Other | Redding · Shasta County | — | — |
| Ledford Construction | David Charles Jr Ledford | — | (530) 440 4711 | Other | Redding · Shasta County | — | — |
| Ledford Construction And Concrete INC | David Charles Jr Ledford | — | (530) 440 4711 | Other | Redding · Shasta County | — | — |
| Lee Gayman Construction | Leland Earl Gayman | — | (530) 510 0785 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Lee One Construction INC | Robert Joseph Grace | — | (530) 227 3478 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Lee Ward Concrete | Lee Ward Concrete | — | (530) 351 3582 | Other | Redding · Shasta County | — | — |
| Lendman Construction INC | Nicholas Paul Lendman | reddingbuilder@hotmail.com | (530) 953 8463 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Leo S Jones Propane Service INC | Daniel Leo Ii Jones | — | (530) 549 3100 | Other | Burney · Shasta County | — | — |
| Leslie Construction | Robert Allen Leslie | — | (530) 941 0738 | Other | Redding · Shasta County | — | — |
| Lifescapes Landscaping | Lifescapes Landscaping | info@lifescapeslandscaping.com | (530) 722 5674 | Windows, patio, painters | Palo Cedro · Shasta County | — | — |
| Lighting Design And Installation | Lighting Design And Installation | — | (530) 440 0712 | Electricians | Redding · Shasta County | — | — |
| Linkus Enterprises LLC | Erik John Harrison | — | (530) 229 9197 | Electricians | Anderson · Shasta County | — | — |
| Linton Construction & Development | Ernest Leroy Linton | — | (530) 351 5783 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Lithic Concrete Construction | Kyle Lawrence Zanni | — | (530) 351 1968 | Other | Redding · Shasta County | — | — |
| Little Doeks Custom Backhoe Service | Ronald Martin Doelker | — | (530) 472 1516 | Other | Whitmore · Shasta County | — | — |
| Living Water Operator Services LLC | Urbano Elidio Farias | — | (530) 722 7421 | Other | Anderson · Shasta County | — | — |
| Livingstone Electric | Anthony Scott Dyer | — | (530) 440 1859 | Electricians | Shasta Lake · Shasta County | — | — |
| Llb Construction | Gregory Alan Jones | — | (530) 209 2799 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Lockwood Enterprises | Joel Darrell Lockwood | — | (530) 378 1885 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Long Branch Tree Service | Jonathan Ryan Dore | — | (530) 355 7921 | Other | Redding · Shasta County | — | — |